diff options
109 files changed, 1820 insertions, 1117 deletions
diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index 8f737e76935c..36fa2a83d714 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -70,7 +70,7 @@ prototypes:: const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *); void (*truncate) (struct inode *); int (*permission) (struct inode *, int, unsigned int); - struct posix_acl * (*get_acl)(struct inode *, int, bool); + struct posix_acl * (*get_inode_acl)(struct inode *, int, bool); int (*setattr) (struct dentry *, struct iattr *); int (*getattr) (const struct path *, struct kstat *, u32, unsigned int); ssize_t (*listxattr) (struct dentry *, char *, size_t); @@ -84,13 +84,14 @@ prototypes:: int (*fileattr_set)(struct user_namespace *mnt_userns, struct dentry *dentry, struct fileattr *fa); int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa); + struct posix_acl * (*get_acl)(struct user_namespace *, struct dentry *, int); locking rules: all may block -============= ============================================= +============== ============================================= ops i_rwsem(inode) -============= ============================================= +============== ============================================= lookup: shared create: exclusive link: exclusive (both) @@ -104,6 +105,7 @@ readlink: no get_link: no setattr: exclusive permission: no (may not block if called in rcu-walk mode) +get_inode_acl: no get_acl: no getattr: no listxattr: no @@ -113,7 +115,7 @@ atomic_open: shared (exclusive if O_CREAT is set in open flags) tmpfile: no fileattr_get: no or exclusive fileattr_set: exclusive -============= ============================================= +============== ============================================= Additionally, ->rmdir(), ->unlink() and ->rename() have ->i_rwsem diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst index df0dc37e6f58..d2d684ae7798 100644 --- a/Documentation/filesystems/porting.rst +++ b/Documentation/filesystems/porting.rst @@ -462,8 +462,8 @@ ERR_PTR(...). argument; instead of passing IPERM_FLAG_RCU we add MAY_NOT_BLOCK into mask. generic_permission() has also lost the check_acl argument; ACL checking -has been taken to VFS and filesystems need to provide a non-NULL ->i_op->get_acl -to read an ACL from disk. +has been taken to VFS and filesystems need to provide a non-NULL +->i_op->get_inode_acl to read an ACL from disk. --- diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst index 2b55f71e2ae1..2c15e7053113 100644 --- a/Documentation/filesystems/vfs.rst +++ b/Documentation/filesystems/vfs.rst @@ -435,7 +435,7 @@ As of kernel 2.6.22, the following members are defined: const char *(*get_link) (struct dentry *, struct inode *, struct delayed_call *); int (*permission) (struct user_namespace *, struct inode *, int); - struct posix_acl * (*get_acl)(struct inode *, int, bool); + struct posix_acl * (*get_inode_acl)(struct inode *, int, bool); int (*setattr) (struct user_namespace *, struct dentry *, struct iattr *); int (*getattr) (struct user_namespace *, const struct path *, struct kstat *, u32, unsigned int); ssize_t (*listxattr) (struct dentry *, char *, size_t); @@ -443,7 +443,8 @@ As of kernel 2.6.22, the following members are defined: int (*atomic_open)(struct inode *, struct dentry *, struct file *, unsigned open_flag, umode_t create_mode); int (*tmpfile) (struct user_namespace *, struct inode *, struct file *, umode_t); - int (*set_acl)(struct user_namespace *, struct inode *, struct posix_acl *, int); + struct posix_acl * (*get_acl)(struct user_namespace *, struct dentry *, int); + int (*set_acl)(struct user_namespace *, struct dentry *, struct posix_acl *, int); int (*fileattr_set)(struct user_namespace *mnt_userns, struct dentry *dentry, struct fileattr *fa); int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa); diff --git a/fs/9p/acl.c b/fs/9p/acl.c index 4dac4a0dc5f4..c397c51f80d9 100644 --- a/fs/9p/acl.c +++ b/fs/9p/acl.c @@ -17,34 +17,64 @@ #include "v9fs_vfs.h" #include "fid.h" -static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name) +static struct posix_acl *v9fs_fid_get_acl(struct p9_fid *fid, const char *name) { ssize_t size; void *value = NULL; struct posix_acl *acl = NULL; size = v9fs_fid_xattr_get(fid, name, NULL, 0); - if (size > 0) { - value = kzalloc(size, GFP_NOFS); - if (!value) - return ERR_PTR(-ENOMEM); - size = v9fs_fid_xattr_get(fid, name, value, size); - if (size > 0) { - acl = posix_acl_from_xattr(&init_user_ns, value, size); - if (IS_ERR(acl)) - goto err_out; - } - } else if (size == -ENODATA || size == 0 || - size == -ENOSYS || size == -EOPNOTSUPP) { - acl = NULL; - } else - acl = ERR_PTR(-EIO); - -err_out: + if (size < 0) + return ERR_PTR(size); + if (size == 0) + return ERR_PTR(-ENODATA); + + value = kzalloc(size, GFP_NOFS); + if (!value) + return ERR_PTR(-ENOMEM); + + size = v9fs_fid_xattr_get(fid, name, value, size); + if (size < 0) + acl = ERR_PTR(size); + else if (size == 0) + acl = ERR_PTR(-ENODATA); + else + acl = posix_acl_from_xattr(&init_user_ns, value, size); kfree(value); return acl; } +static struct posix_acl *v9fs_acl_get(struct dentry *dentry, const char *name) +{ + struct p9_fid *fid; + struct posix_acl *acl = NULL; + + fid = v9fs_fid_lookup(dentry); + if (IS_ERR(fid)) + return ERR_CAST(fid); + + acl = v9fs_fid_get_acl(fid, name); + p9_fid_put(fid); + return acl; +} + +static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, const char *name) +{ + int retval; + struct posix_acl *acl = NULL; + + acl = v9fs_fid_get_acl(fid, name); + if (!IS_ERR(acl)) + return acl; + + retval = PTR_ERR(acl); + if (retval == -ENODATA || retval == -ENOSYS || retval == -EOPNOTSUPP) + return NULL; + + /* map everything else to -EIO */ + return ERR_PTR(-EIO); +} + int v9fs_get_acl(struct inode *inode, struct p9_fid *fid) { int retval = 0; @@ -89,7 +119,7 @@ static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type) return acl; } -struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type, bool rcu) +struct posix_acl *v9fs_iop_get_inode_acl(struct inode *inode, int type, bool rcu) { struct v9fs_session_info *v9ses; @@ -109,6 +139,112 @@ struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type, bool rcu) } +struct posix_acl *v9fs_iop_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type) +{ + struct v9fs_session_info *v9ses; + + v9ses = v9fs_dentry2v9ses(dentry); + /* We allow set/get/list of acl when access=client is not specified. */ + if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) + return v9fs_acl_get(dentry, posix_acl_xattr_name(type)); + return v9fs_get_cached_acl(d_inode(dentry), type); +} + +int v9fs_iop_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + struct posix_acl *acl, int type) +{ + int retval; + size_t size = 0; + void *value = NULL; + const char *acl_name; + struct v9fs_session_info *v9ses; + struct inode *inode = d_inode(dentry); + + if (acl) { + retval = posix_acl_valid(inode->i_sb->s_user_ns, acl); + if (retval) + goto err_out; + + size = posix_acl_xattr_size(acl->a_count); + + value = kzalloc(size, GFP_NOFS); + if (!value) { + retval = -ENOMEM; + goto err_out; + } + + retval = posix_acl_to_xattr(&init_user_ns, acl, value, size); + if (retval < 0) + goto err_out; + } + + /* + * set the attribute on the remote. Without even looking at the + * xattr value. We leave it to the server to validate + */ + acl_name = posix_acl_xattr_name(type); + v9ses = v9fs_dentry2v9ses(dentry); + if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) { + retval = v9fs_xattr_set(dentry, acl_name, value, size, 0); + goto err_out; + } + + if (S_ISLNK(inode->i_mode)) { + retval = -EOPNOTSUPP; + goto err_out; + } + + if (!inode_owner_or_capable(&init_user_ns, inode)) { + retval = -EPERM; + goto err_out; + } + + switch (type) { + case ACL_TYPE_ACCESS: + if (acl) { + struct iattr iattr = {}; + struct posix_acl *acl_mode = acl; + + retval = posix_acl_update_mode(&init_user_ns, inode, + &iattr.ia_mode, + &acl_mode); + if (retval) + goto err_out; + if (!acl_mode) { + /* + * ACL can be represented by the mode bits. + * So don't update ACL below. + */ + kfree(value); + value = NULL; + size = 0; + } + iattr.ia_valid = ATTR_MODE; + /* + * FIXME should we update ctime ? + * What is the following setxattr update the mode ? + */ + v9fs_vfs_setattr_dotl(&init_user_ns, dentry, &iattr); + } + break; + case ACL_TYPE_DEFAULT: + if (!S_ISDIR(inode->i_mode)) { + retval = acl ? -EINVAL : 0; + goto err_out; + } + break; + } + + retval = v9fs_xattr_set(dentry, acl_name, value, size, 0); + if (!retval) + set_cached_acl(inode, type, acl); + +err_out: + kfree(value); + return retval; +} + static int v9fs_set_acl(struct p9_fid *fid, int type, struct posix_acl *acl) { int retval; @@ -207,124 +343,3 @@ int v9fs_acl_mode(struct inode *dir, umode_t *modep, *modep = mode; return 0; } - -static int v9fs_xattr_get_acl(const struct xattr_handler *handler, - struct dentry *dentry, struct inode *inode, - const char *name, void *buffer, size_t size) -{ - struct v9fs_session_info *v9ses; - struct posix_acl *acl; - int error; - - v9ses = v9fs_dentry2v9ses(dentry); - /* - * We allow set/get/list of acl when access=client is not specified - */ - if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) - return v9fs_xattr_get(dentry, handler->name, buffer, size); - - acl = v9fs_get_cached_acl(inode, handler->flags); - if (IS_ERR(acl)) - return PTR_ERR(acl); - if (acl == NULL) - return -ENODATA; - error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); - posix_acl_release(acl); - - return error; -} - -static int v9fs_xattr_set_acl(const struct xattr_handler *handler, - struct user_namespace *mnt_userns, - struct dentry *dentry, struct inode *inode, - const char *name, const void *value, - size_t size, int flags) -{ - int retval; - struct posix_acl *acl; - struct v9fs_session_info *v9ses; - - v9ses = v9fs_dentry2v9ses(dentry); - /* - * set the attribute on the remote. Without even looking at the - * xattr value. We leave it to the server to validate - */ - if ((v9ses->flags & V9FS_ACCESS_MASK) != V9FS_ACCESS_CLIENT) - return v9fs_xattr_set(dentry, handler->name, value, size, - flags); - - if (S_ISLNK(inode->i_mode)) - return -EOPNOTSUPP; - if (!inode_owner_or_capable(&init_user_ns, inode)) - return -EPERM; - if (value) { - /* update the cached acl value */ - acl = posix_acl_from_xattr(&init_user_ns, value, size); - if (IS_ERR(acl)) - return PTR_ERR(acl); - else if (acl) { - retval = posix_acl_valid(inode->i_sb->s_user_ns, acl); - if (retval) - goto err_out; - } - } else - acl = NULL; - - switch (handler->flags) { - case ACL_TYPE_ACCESS: - if (acl) { - struct iattr iattr = { 0 }; - struct posix_acl *old_acl = acl; - - retval = posix_acl_update_mode(&init_user_ns, inode, - &iattr.ia_mode, &acl); - if (retval) - goto err_out; - if (!acl) { - /* - * ACL can be represented - * by the mode bits. So don't - * update ACL. - */ - posix_acl_release(old_acl); - value = NULL; - size = 0; - } - iattr.ia_valid = ATTR_MODE; - /* FIXME should we update ctime ? - * What is the following setxattr update the - * mode ? - */ - v9fs_vfs_setattr_dotl(&init_user_ns, dentry, &iattr); - } - break; - case ACL_TYPE_DEFAULT: - if (!S_ISDIR(inode->i_mode)) { - retval = acl ? -EINVAL : 0; - goto err_out; - } - break; - default: - BUG(); - } - retval = v9fs_xattr_set(dentry, handler->name, value, size, flags); - if (!retval) - set_cached_acl(inode, handler->flags, acl); -err_out: - posix_acl_release(acl); - return retval; -} - -const struct xattr_handler v9fs_xattr_acl_access_handler = { - .name = XATTR_NAME_POSIX_ACL_ACCESS, - .flags = ACL_TYPE_ACCESS, - .get = v9fs_xattr_get_acl, - .set = v9fs_xattr_set_acl, -}; - -const struct xattr_handler v9fs_xattr_acl_default_handler = { - .name = XATTR_NAME_POSIX_ACL_DEFAULT, - .flags = ACL_TYPE_DEFAULT, - .get = v9fs_xattr_get_acl, - .set = v9fs_xattr_set_acl, -}; diff --git a/fs/9p/acl.h b/fs/9p/acl.h index ce5175d463dd..4c60a2bce5de 100644 --- a/fs/9p/acl.h +++ b/fs/9p/acl.h @@ -8,8 +8,12 @@ #ifdef CONFIG_9P_FS_POSIX_ACL int v9fs_get_acl(struct inode *inode, struct p9_fid *fid); -struct posix_acl *v9fs_iop_get_acl(struct inode *inode, int type, +struct posix_acl *v9fs_iop_get_inode_acl(struct inode *inode, int type, bool rcu); +struct posix_acl *v9fs_iop_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type); +int v9fs_iop_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + struct posix_acl *acl, int type); int v9fs_acl_chmod(struct inode *inode, struct p9_fid *fid); int v9fs_set_create_acl(struct inode *inode, struct p9_fid *fid, struct posix_acl *dacl, struct posix_acl *acl); @@ -17,7 +21,9 @@ int v9fs_acl_mode(struct inode *dir, umode_t *modep, struct posix_acl **dpacl, struct posix_acl **pacl); void v9fs_put_acl(struct posix_acl *dacl, struct posix_acl *acl); #else +#define v9fs_iop_get_inode_acl NULL #define v9fs_iop_get_acl NULL +#define v9fs_iop_set_acl NULL static inline int v9fs_get_acl(struct inode *inode, struct p9_fid *fid) { return 0; diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 5cfa4b4f070f..03c1743c4aff 100644 --- a/fs/9p/vfs_inode_dotl.c +++ b/fs/9p/vfs_inode_dotl.c @@ -983,14 +983,18 @@ const struct inode_operations v9fs_dir_inode_operations_dotl = { .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .listxattr = v9fs_listxattr, + .get_inode_acl = v9fs_iop_get_inode_acl, .get_acl = v9fs_iop_get_acl, + .set_acl = v9fs_iop_set_acl, }; const struct inode_operations v9fs_file_inode_operations_dotl = { .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .listxattr = v9fs_listxattr, + .get_inode_acl = v9fs_iop_get_inode_acl, .get_acl = v9fs_iop_get_acl, + .set_acl = v9fs_iop_set_acl, }; const struct inode_operations v9fs_symlink_inode_operations_dotl = { diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c index 2807bb63f780..b6984311e00a 100644 --- a/fs/9p/xattr.c +++ b/fs/9p/xattr.c @@ -8,6 +8,7 @@ #include <linux/fs.h> #include <linux/sched.h> #include <linux/uio.h> +#include <linux/posix_acl_xattr.h> #include <net/9p/9p.h> #include <net/9p/client.h> @@ -182,9 +183,9 @@ static struct xattr_handler v9fs_xattr_security_handler = { const struct xattr_handler *v9fs_xattr_handlers[] = { &v9fs_xattr_user_handler, &v9fs_xattr_trusted_handler, -#ifdef CONFIG_9P_FS_POSIX_ACL - &v9fs_xattr_acl_access_handler, - &v9fs_xattr_acl_default_handler, +#ifdef CONFIG_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, #endif #ifdef CONFIG_9P_FS_SECURITY &v9fs_xattr_security_handler, diff --git a/fs/9p/xattr.h b/fs/9p/xattr.h index 3e11fc3331eb..b5636e544c8a 100644 --- a/fs/9p/xattr.h +++ b/fs/9p/xattr.h @@ -11,8 +11,6 @@ #include <net/9p/client.h> extern const struct xattr_handler *v9fs_xattr_handlers[]; -extern const struct xattr_handler v9fs_xattr_acl_access_handler; -extern const struct xattr_handler v9fs_xattr_acl_default_handler; ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name, void *buffer, size_t buffer_size); diff --git a/fs/bad_inode.c b/fs/bad_inode.c index 9d1cde8066cf..92737166203f 100644 --- a/fs/bad_inode.c +++ b/fs/bad_inode.c @@ -154,7 +154,7 @@ static int bad_inode_tmpfile(struct user_namespace *mnt_userns, } static int bad_inode_set_acl(struct user_namespace *mnt_userns, - struct inode *inode, struct posix_acl *acl, + struct dentry *dentry, struct posix_acl *acl, int type) { return -EIO; @@ -177,7 +177,7 @@ static const struct inode_operations bad_inode_ops = .setattr = bad_inode_setattr, .listxattr = bad_inode_listxattr, .get_link = bad_inode_get_link, - .get_acl = bad_inode_get_acl, + .get_inode_acl = bad_inode_get_acl, .fiemap = bad_inode_fiemap, .update_time = bad_inode_update_time, .atomic_open = bad_inode_atomic_open, diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 548d6a5477b4..1e47b3ec3989 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -110,10 +110,11 @@ out: return ret; } -int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int btrfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int ret; + struct inode *inode = d_inode(dentry); umode_t old_mode = inode->i_mode; if (type == ACL_TYPE_ACCESS && acl) { diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 9e6d48ff4597..919670d35919 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3993,7 +3993,7 @@ static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag) /* acl.c */ #ifdef CONFIG_BTRFS_FS_POSIX_ACL struct posix_acl *btrfs_get_acl(struct inode *inode, int type, bool rcu); -int btrfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int btrfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); int __btrfs_set_acl(struct btrfs_trans_handle *trans, struct inode *inode, struct posix_acl *acl, int type); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 0e516aefbf51..5a54bb93c413 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5256,7 +5256,7 @@ static int btrfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentr err = btrfs_dirty_inode(inode); if (!err && attr->ia_valid & ATTR_MODE) - err = posix_acl_chmod(mnt_userns, inode, inode->i_mode); + err = posix_acl_chmod(mnt_userns, dentry, inode->i_mode); } return err; @@ -11296,7 +11296,7 @@ static const struct inode_operations btrfs_dir_inode_operations = { .mknod = btrfs_mknod, .listxattr = btrfs_listxattr, .permission = btrfs_permission, - .get_acl = btrfs_get_acl, + .get_inode_acl = btrfs_get_acl, .set_acl = btrfs_set_acl, .update_time = btrfs_update_time, .tmpfile = btrfs_tmpfile, @@ -11349,7 +11349,7 @@ static const struct inode_operations btrfs_file_inode_operations = { .listxattr = btrfs_listxattr, .permission = btrfs_permission, .fiemap = btrfs_fiemap, - .get_acl = btrfs_get_acl, + .get_inode_acl = btrfs_get_acl, .set_acl = btrfs_set_acl, .update_time = btrfs_update_time, .fileattr_get = btrfs_fileattr_get, @@ -11360,7 +11360,7 @@ static const struct inode_operations btrfs_special_inode_operations = { .setattr = btrfs_setattr, .permission = btrfs_permission, .listxattr = btrfs_listxattr, - .get_acl = btrfs_get_acl, + .get_inode_acl = btrfs_get_acl, .set_acl = btrfs_set_acl, .update_time = btrfs_update_time, }; diff --git a/fs/ceph/acl.c b/fs/ceph/acl.c index f4fc8e0b847c..c7e8dd5b58d4 100644 --- a/fs/ceph/acl.c +++ b/fs/ceph/acl.c @@ -85,13 +85,14 @@ retry: return acl; } -int ceph_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ceph_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int ret = 0, size = 0; const char *name = NULL; char *value = NULL; struct iattr newattrs; + struct inode *inode = d_inode(dentry); struct timespec64 old_ctime = inode->i_ctime; umode_t new_mode = inode->i_mode, old_mode = inode->i_mode; diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index e7e2ebac330d..6c7026cc8988 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -2033,7 +2033,7 @@ const struct inode_operations ceph_dir_iops = { .getattr = ceph_getattr, .setattr = ceph_setattr, .listxattr = ceph_listxattr, - .get_acl = ceph_get_acl, + .get_inode_acl = ceph_get_acl, .set_acl = ceph_set_acl, .mknod = ceph_mknod, .symlink = ceph_symlink, diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index d53399966a2d..f23c5a6edc6f 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -126,7 +126,7 @@ const struct inode_operations ceph_file_iops = { .setattr = ceph_setattr, .getattr = ceph_getattr, .listxattr = ceph_listxattr, - .get_acl = ceph_get_acl, + .get_inode_acl = ceph_get_acl, .set_acl = ceph_set_acl, }; @@ -2255,7 +2255,7 @@ int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, err = __ceph_setattr(inode, attr); if (err >= 0 && (attr->ia_valid & ATTR_MODE)) - err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode); + err = posix_acl_chmod(&init_user_ns, dentry, attr->ia_mode); return err; } diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 40630e6f691c..50e57a1fa32f 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1117,7 +1117,7 @@ void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx); struct posix_acl *ceph_get_acl(struct inode *, int, bool); int ceph_set_acl(struct user_namespace *mnt_userns, - struct inode *inode, struct posix_acl *acl, int type); + struct dentry *dentry, struct posix_acl *acl, int type); int ceph_pre_init_acls(struct inode *dir, umode_t *mode, struct ceph_acl_sec_ctx *as_ctx); void ceph_init_inode_acls(struct inode *inode, diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c index fa480d62f313..c647f0d56518 100644 --- a/fs/cifs/cifsacl.c +++ b/fs/cifs/cifsacl.c @@ -13,6 +13,9 @@ #include <linux/string.h> #include <linux/keyctl.h> #include <linux/key-type.h> +#include <uapi/linux/posix_acl.h> +#include <linux/posix_acl.h> +#include <linux/posix_acl_xattr.h> #include <keys/user-type.h> #include "cifspdu.h" #include "cifsglob.h" @@ -20,6 +23,8 @@ #include "cifsproto.h" #include "cifs_debug.h" #include "fs_context.h" +#include "cifs_fs_sb.h" +#include "cifs_unicode.h" /* security id for everyone/world system group */ static const struct cifs_sid sid_everyone = { @@ -1668,3 +1673,137 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 *pnmode, kfree(pntsd); return rc; } + +struct posix_acl *cifs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type) +{ +#if defined(CONFIG_CIFS_ALLOW_INSECURE_LEGACY) && defined(CONFIG_CIFS_POSIX) + struct posix_acl *acl = NULL; + ssize_t rc = -EOPNOTSUPP; + unsigned int xid; + struct super_block *sb = dentry->d_sb; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + struct tcon_link *tlink; + struct cifs_tcon *pTcon; + const char *full_path; + void *page; + + tlink = cifs_sb_tlink(cifs_sb); + if (IS_ERR(tlink)) + return ERR_CAST(tlink); + pTcon = tlink_tcon(tlink); + + xid = get_xid(); + page = alloc_dentry_path(); + + full_path = build_path_from_dentry(dentry, page); + if (IS_ERR(full_path)) { + acl = ERR_CAST(full_path); + goto out; + } + + /* return alt name if available as pseudo attr */ + switch (type) { + case ACL_TYPE_ACCESS: + if (sb->s_flags & SB_POSIXACL) + rc = cifs_do_get_acl(xid, pTcon, full_path, &acl, + ACL_TYPE_ACCESS, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + break; + + case ACL_TYPE_DEFAULT: + if (sb->s_flags & SB_POSIXACL) + rc = cifs_do_get_acl(xid, pTcon, full_path, &acl, + ACL_TYPE_DEFAULT, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + break; + } + + if (rc < 0) { + if (rc == -EINVAL) + acl = ERR_PTR(-EOPNOTSUPP); + else + acl = ERR_PTR(rc); + } + +out: + free_dentry_path(page); + free_xid(xid); + cifs_put_tlink(tlink); + return acl; +#else + return ERR_PTR(-EOPNOTSUPP); +#endif +} + +int cifs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + struct posix_acl *acl, int type) +{ +#if defined(CONFIG_CIFS_ALLOW_INSECURE_LEGACY) && defined(CONFIG_CIFS_POSIX) + int rc = -EOPNOTSUPP; + unsigned int xid; + struct super_block *sb = dentry->d_sb; + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + struct tcon_link *tlink; + struct cifs_tcon *pTcon; + const char *full_path; + void *page; + + tlink = cifs_sb_tlink(cifs_sb); + if (IS_ERR(tlink)) + return PTR_ERR(tlink); + pTcon = tlink_tcon(tlink); + + xid = get_xid(); + page = alloc_dentry_path(); + + full_path = build_path_from_dentry(dentry, page); + if (IS_ERR(full_path)) { + rc = PTR_ERR(full_path); + goto out; + } + + if (!acl) + goto out; + + /* return dos attributes as pseudo xattr */ + /* return alt name if available as pseudo attr */ + + /* if proc/fs/cifs/streamstoxattr is set then + search server for EAs or streams to + returns as xattrs */ + if (posix_acl_xattr_size(acl->a_count) > CIFSMaxBufSize) { + cifs_dbg(FYI, "size of EA value too large\n"); + rc = -EOPNOTSUPP; + goto out; + } + + switch (type) { + case ACL_TYPE_ACCESS: + if (sb->s_flags & SB_POSIXACL) + rc = cifs_do_set_acl(xid, pTcon, full_path, acl, + ACL_TYPE_ACCESS, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + break; + + case ACL_TYPE_DEFAULT: + if (sb->s_flags & SB_POSIXACL) + rc = cifs_do_set_acl(xid, pTcon, full_path, acl, + ACL_TYPE_DEFAULT, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + break; + } + +out: + free_dentry_path(page); + free_xid(xid); + cifs_put_tlink(tlink); + return rc; +#else + return -EOPNOTSUPP; +#endif +} diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 712a43161448..040267ed8a64 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -1133,6 +1133,8 @@ const struct inode_operations cifs_dir_inode_ops = { .symlink = cifs_symlink, .mknod = cifs_mknod, .listxattr = cifs_listxattr, + .get_acl = cifs_get_acl, + .set_acl = cifs_set_acl, }; const struct inode_operations cifs_file_inode_ops = { @@ -1141,6 +1143,8 @@ const struct inode_operations cifs_file_inode_ops = { .permission = cifs_permission, .listxattr = cifs_listxattr, .fiemap = cifs_fiemap, + .get_acl = cifs_get_acl, + .set_acl = cifs_set_acl, }; const char *cifs_get_link(struct dentry *dentry, struct inode *inode, diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 83e83d8beabb..f50f96e4ec30 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -224,6 +224,10 @@ extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *, const char *, u32 *, u32); extern struct cifs_ntsd *get_cifs_acl_by_fid(struct cifs_sb_info *, const struct cifs_fid *, u32 *, u32); +extern struct posix_acl *cifs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type); +extern int cifs_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, struct posix_acl *acl, int type); extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *, const char *, int); extern unsigned int setup_authusers_ACE(struct cifs_ace *pace); @@ -537,14 +541,14 @@ extern int CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon, __u16 fid, struct cifs_ntsd **acl_inf, __u32 *buflen); extern int CIFSSMBSetCIFSACL(const unsigned int, struct cifs_tcon *, __u16, struct cifs_ntsd *, __u32, int); -extern int CIFSSMBGetPosixACL(const unsigned int xid, struct cifs_tcon *tcon, - const unsigned char *searchName, - char *acl_inf, const int buflen, const int acl_type, - const struct nls_table *nls_codepage, int remap_special_chars); -extern int CIFSSMBSetPosixACL(const unsigned int xid, struct cifs_tcon *tcon, - const unsigned char *fileName, - const char *local_acl, const int buflen, const int acl_type, - const struct nls_table *nls_codepage, int remap_special_chars); +extern int cifs_do_get_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *searchName, + struct posix_acl **acl, const int acl_type, + const struct nls_table *nls_codepage, int remap); +extern int cifs_do_set_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *fileName, + const struct posix_acl *acl, const int acl_type, + const struct nls_table *nls_codepage, int remap); extern int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon, const int netfid, __u64 *pExtAttrBits, __u64 *pMask); #endif /* CIFS_ALLOW_INSECURE_LEGACY */ diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 1724066c1536..23f10e0d6e7e 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -2914,32 +2914,57 @@ CIFSSMB_set_compression(const unsigned int xid, struct cifs_tcon *tcon, #ifdef CONFIG_CIFS_POSIX -/*Convert an Access Control Entry from wire format to local POSIX xattr format*/ -static void cifs_convert_ace(struct posix_acl_xattr_entry *ace, - struct cifs_posix_ace *cifs_ace) +#ifdef CONFIG_FS_POSIX_ACL +/** + * cifs_init_posix_acl - convert ACL from cifs to POSIX ACL format + * @ace: POSIX ACL entry to store converted ACL into + * @cifs_ace: ACL in cifs format + * + * Convert an Access Control Entry from wire format to local POSIX xattr + * format. + * + * Note that the @cifs_uid member is used to store both {g,u}id_t. + */ +static void cifs_init_posix_acl(struct posix_acl_entry *ace, + struct cifs_posix_ace *cifs_ace) { /* u8 cifs fields do not need le conversion */ - ace->e_perm = cpu_to_le16(cifs_ace->cifs_e_perm); - ace->e_tag = cpu_to_le16(cifs_ace->cifs_e_tag); - ace->e_id = cpu_to_le32(le64_to_cpu(cifs_ace->cifs_uid)); -/* - cifs_dbg(FYI, "perm %d tag %d id %d\n", - ace->e_perm, ace->e_tag, ace->e_id); -*/ + ace->e_perm = cifs_ace->cifs_e_perm; + ace->e_tag = cifs_ace->cifs_e_tag; + switch (ace->e_tag) { + case ACL_USER: + ace->e_uid = make_kuid(&init_user_ns, + le64_to_cpu(cifs_ace->cifs_uid)); + break; + case ACL_GROUP: + ace->e_gid = make_kgid(&init_user_ns, + le64_to_cpu(cifs_ace->cifs_uid)); + break; + } return; } -/* Convert ACL from CIFS POSIX wire format to local Linux POSIX ACL xattr */ -static int cifs_copy_posix_acl(char *trgt, char *src, const int buflen, - const int acl_type, const int size_of_data_area) +/** + * cifs_to_posix_acl - copy cifs ACL format to POSIX ACL format + * @acl: ACLs returned in POSIX ACL format + * @src: ACLs in cifs format + * @acl_type: type of POSIX ACL requested + * @size_of_data_area: size of SMB we got + * + * This function converts ACLs from cifs format to POSIX ACL format. + * If @acl is NULL then the size of the buffer required to store POSIX ACLs in + * their uapi format is returned. + */ +static int cifs_to_posix_acl(struct posix_acl **acl, char *src, + const int acl_type, const int size_of_data_area) { int size = 0; - int i; __u16 count; struct cifs_posix_ace *pACE; struct cifs_posix_acl *cifs_acl = (struct cifs_posix_acl *)src; - struct posix_acl_xattr_header *local_acl = (void *)trgt; + struct posix_acl *kacl = NULL; + struct posix_acl_entry *pa, *pe; if (le16_to_cpu(cifs_acl->version) != CIFS_ACL_VERSION) return -EOPNOTSUPP; @@ -2959,7 +2984,7 @@ static int cifs_copy_posix_acl(char *trgt, char *src, const int buflen, count = le16_to_cpu(cifs_acl->access_entry_count); size = sizeof(struct cifs_posix_acl); size += sizeof(struct cifs_posix_ace) * count; -/* skip past access ACEs to get to default ACEs */ + /* skip past access ACEs to get to default ACEs */ pACE = &cifs_acl->ace_array[count]; count = le16_to_cpu(cifs_acl->default_entry_count); size += sizeof(struct cifs_posix_ace) * count; @@ -2971,62 +2996,75 @@ static int cifs_copy_posix_acl(char *trgt, char *src, const int buflen, return -EINVAL; } - size = posix_acl_xattr_size(count); - if ((buflen == 0) || (local_acl == NULL)) { - /* used to query ACL EA size */ - } else if (size > buflen) { - return -ERANGE; - } else /* buffer big enough */ { - struct posix_acl_xattr_entry *ace = (void *)(local_acl + 1); - - local_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); - for (i = 0; i < count ; i++) { - cifs_convert_ace(&ace[i], pACE); - pACE++; - } + /* Allocate number of POSIX ACLs to store in VFS format. */ + kacl = posix_acl_alloc(count, GFP_NOFS); + if (!kacl) + return -ENOMEM; + + FOREACH_ACL_ENTRY(pa, kacl, pe) { + cifs_init_posix_acl(pa, pACE); + pACE++; } - return size; + + *acl = kacl; + return 0; } -static void convert_ace_to_cifs_ace(struct cifs_posix_ace *cifs_ace, - const struct posix_acl_xattr_entry *local_ace) +/** + * cifs_init_ace - convert ACL entry from POSIX ACL to cifs format + * @cifs_ace: the cifs ACL entry to store into + * @local_ace: the POSIX ACL entry to convert + */ +static void cifs_init_ace(struct cifs_posix_ace *cifs_ace, + const struct posix_acl_entry *local_ace) { - cifs_ace->cifs_e_perm = le16_to_cpu(local_ace->e_perm); - cifs_ace->cifs_e_tag = le16_to_cpu(local_ace->e_tag); - /* BB is there a better way to handle the large uid? */ - if (local_ace->e_id == cpu_to_le32(-1)) { - /* Probably no need to le convert -1 on any arch but can not hurt */ + cifs_ace->cifs_e_perm = local_ace->e_perm; + cifs_ace->cifs_e_tag = local_ace->e_tag; + + switch (local_ace->e_tag) { + case ACL_USER: + cifs_ace->cifs_uid = + cpu_to_le64(from_kuid(&init_user_ns, local_ace->e_uid)); + break; + case ACL_GROUP: + cifs_ace->cifs_uid = + cpu_to_le64(from_kgid(&init_user_ns, local_ace->e_gid)); + break; + default: cifs_ace->cifs_uid = cpu_to_le64(-1); - } else - cifs_ace->cifs_uid = cpu_to_le64(le32_to_cpu(local_ace->e_id)); -/* - cifs_dbg(FYI, "perm %d tag %d id %d\n", - ace->e_perm, ace->e_tag, ace->e_id); -*/ + } } -/* Convert ACL from local Linux POSIX xattr to CIFS POSIX ACL wire format */ -static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL, - const int buflen, const int acl_type) +/** + * posix_acl_to_cifs - convert ACLs from POSIX ACL to cifs format + * @parm_data: ACLs in cifs format to conver to + * @acl: ACLs in POSIX ACL format to convert from + * @acl_type: the type of POSIX ACLs stored in @acl + * + * Return: the number cifs ACL entries after conversion + */ +static __u16 posix_acl_to_cifs(char *parm_data, const struct posix_acl *acl, + const int acl_type) { __u16 rc = 0; struct cifs_posix_acl *cifs_acl = (struct cifs_posix_acl *)parm_data; - struct posix_acl_xattr_header *local_acl = (void *)pACL; - struct posix_acl_xattr_entry *ace = (void *)(local_acl + 1); + const struct posix_acl_entry *pa, *pe; int count; - int i; + int i = 0; - if ((buflen == 0) || (pACL == NULL) || (cifs_acl == NULL)) + if ((acl == NULL) || (cifs_acl == NULL)) return 0; - count = posix_acl_xattr_count((size_t)buflen); - cifs_dbg(FYI, "setting acl with %d entries from buf of length %d and version of %d\n", - count, buflen, le32_to_cpu(local_acl->a_version)); - if (le32_to_cpu(local_acl->a_version) != 2) { - cifs_dbg(FYI, "unknown POSIX ACL version %d\n", - le32_to_cpu(local_acl->a_version)); - return 0; - } + count = acl->a_count; + cifs_dbg(FYI, "setting acl with %d entries\n", count); + + /* + * Note that the uapi POSIX ACL version is verified by the VFS and is + * independent of the cifs ACL version. Changing the POSIX ACL version + * is a uapi change and if it's changed we will pass down the POSIX ACL + * version in struct posix_acl from the VFS. For now there's really + * only one that all filesystems know how to deal with. + */ cifs_acl->version = cpu_to_le16(1); if (acl_type == ACL_TYPE_ACCESS) { cifs_acl->access_entry_count = cpu_to_le16(count); @@ -3038,8 +3076,9 @@ static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL, cifs_dbg(FYI, "unknown ACL type %d\n", acl_type); return 0; } - for (i = 0; i < count; i++) - convert_ace_to_cifs_ace(&cifs_acl->ace_array[i], &ace[i]); + FOREACH_ACL_ENTRY(pa, acl, pe) { + cifs_init_ace(&cifs_acl->ace_array[i++], pa); + } if (rc == 0) { rc = (__u16)(count * sizeof(struct cifs_posix_ace)); rc += sizeof(struct cifs_posix_acl); @@ -3048,11 +3087,10 @@ static __u16 ACL_to_cifs_posix(char *parm_data, const char *pACL, return rc; } -int -CIFSSMBGetPosixACL(const unsigned int xid, struct cifs_tcon *tcon, - const unsigned char *searchName, - char *acl_inf, const int buflen, const int acl_type, - const struct nls_table *nls_codepage, int remap) +int cifs_do_get_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *searchName, struct posix_acl **acl, + const int acl_type, const struct nls_table *nls_codepage, + int remap) { /* SMB_QUERY_POSIX_ACL */ TRANSACTION2_QPI_REQ *pSMB = NULL; @@ -3124,23 +3162,26 @@ queryAclRetry: else { __u16 data_offset = le16_to_cpu(pSMBr->t2.DataOffset); __u16 count = le16_to_cpu(pSMBr->t2.DataCount); - rc = cifs_copy_posix_acl(acl_inf, + rc = cifs_to_posix_acl(acl, (char *)&pSMBr->hdr.Protocol+data_offset, - buflen, acl_type, count); + acl_type, count); } } cifs_buf_release(pSMB); + /* + * The else branch after SendReceive() doesn't return EAGAIN so if we + * allocated @acl in cifs_to_posix_acl() we are guaranteed to return + * here and don't leak POSIX ACLs. + */ if (rc == -EAGAIN) goto queryAclRetry; return rc; } -int -CIFSSMBSetPosixACL(const unsigned int xid, struct cifs_tcon *tcon, - const unsigned char *fileName, - const char *local_acl, const int buflen, - const int acl_type, - const struct nls_table *nls_codepage, int remap) +int cifs_do_set_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *fileName, const struct posix_acl *acl, + const int acl_type, const struct nls_table *nls_codepage, + int remap) { struct smb_com_transaction2_spi_req *pSMB = NULL; struct smb_com_transaction2_spi_rsp *pSMBr = NULL; @@ -3181,7 +3222,7 @@ setAclRetry: pSMB->ParameterOffset = cpu_to_le16(param_offset); /* convert to on the wire format for POSIX ACL */ - data_count = ACL_to_cifs_posix(parm_data, local_acl, buflen, acl_type); + data_count = posix_acl_to_cifs(parm_data, acl, acl_type); if (data_count == 0) { rc = -EOPNOTSUPP; @@ -3211,6 +3252,23 @@ setACLerrorExit: goto setAclRetry; return rc; } +#else +int cifs_do_get_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *searchName, struct posix_acl **acl, + const int acl_type, const struct nls_table *nls_codepage, + int remap) +{ + return -EOPNOTSUPP; +} + +int cifs_do_set_acl(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *fileName, const struct posix_acl *acl, + const int acl_type, const struct nls_table *nls_codepage, + int remap) +{ + return -EOPNOTSUPP; +} +#endif /* CONFIG_FS_POSIX_ACL */ int CIFSGetExtAttr(const unsigned int xid, struct cifs_tcon *tcon, diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c index 998fa51f9b68..5f2fb2fd2e37 100644 --- a/fs/cifs/xattr.c +++ b/fs/cifs/xattr.c @@ -200,32 +200,6 @@ static int cifs_xattr_set(const struct xattr_handler *handler, } break; } - -#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY - case XATTR_ACL_ACCESS: -#ifdef CONFIG_CIFS_POSIX - if (!value) - goto out; - if (sb->s_flags & SB_POSIXACL) - rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, - value, (const int)size, - ACL_TYPE_ACCESS, cifs_sb->local_nls, - cifs_remap(cifs_sb)); -#endif /* CONFIG_CIFS_POSIX */ - break; - - case XATTR_ACL_DEFAULT: -#ifdef CONFIG_CIFS_POSIX - if (!value) - goto out; - if (sb->s_flags & SB_POSIXACL) - rc = CIFSSMBSetPosixACL(xid, pTcon, full_path, - value, (const int)size, - ACL_TYPE_DEFAULT, cifs_sb->local_nls, - cifs_remap(cifs_sb)); -#endif /* CONFIG_CIFS_POSIX */ - break; -#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ } out: @@ -366,27 +340,6 @@ static int cifs_xattr_get(const struct xattr_handler *handler, } break; } -#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY - case XATTR_ACL_ACCESS: -#ifdef CONFIG_CIFS_POSIX - if (sb->s_flags & SB_POSIXACL) - rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, - value, size, ACL_TYPE_ACCESS, - cifs_sb->local_nls, - cifs_remap(cifs_sb)); -#endif /* CONFIG_CIFS_POSIX */ - break; - - case XATTR_ACL_DEFAULT: -#ifdef CONFIG_CIFS_POSIX - if (sb->s_flags & SB_POSIXACL) - rc = CIFSSMBGetPosixACL(xid, pTcon, full_path, - value, size, ACL_TYPE_DEFAULT, - cifs_sb->local_nls, - cifs_remap(cifs_sb)); -#endif /* CONFIG_CIFS_POSIX */ - break; -#endif /* ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ } /* We could add an additional check for streams ie @@ -525,21 +478,6 @@ static const struct xattr_handler smb3_ntsd_full_xattr_handler = { .set = cifs_xattr_set, }; - -static const struct xattr_handler cifs_posix_acl_access_xattr_handler = { - .name = XATTR_NAME_POSIX_ACL_ACCESS, - .flags = XATTR_ACL_ACCESS, - .get = cifs_xattr_get, - .set = cifs_xattr_set, -}; - -static const struct xattr_handler cifs_posix_acl_default_xattr_handler = { - .name = XATTR_NAME_POSIX_ACL_DEFAULT, - .flags = XATTR_ACL_DEFAULT, - .get = cifs_xattr_get, - .set = cifs_xattr_set, -}; - const struct xattr_handler *cifs_xattr_handlers[] = { &cifs_user_xattr_handler, &cifs_os2_xattr_handler, @@ -549,7 +487,9 @@ const struct xattr_handler *cifs_xattr_handlers[] = { &smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */ &cifs_cifs_ntsd_full_xattr_handler, &smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */ - &cifs_posix_acl_access_xattr_handler, - &cifs_posix_acl_default_xattr_handler, +#ifdef CONFIG_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif NULL }; diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index c214fe0981bd..f3cd00fac9c3 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -18,6 +18,8 @@ #include <linux/fs_stack.h> #include <linux/slab.h> #include <linux/xattr.h> +#include <linux/posix_acl.h> +#include <linux/posix_acl_xattr.h> #include <linux/fileattr.h> #include <asm/unaligned.h> #include "ecryptfs_kernel.h" @@ -1120,6 +1122,28 @@ static int ecryptfs_fileattr_set(struct user_namespace *mnt_userns, return rc; } +static struct posix_acl *ecryptfs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type) +{ + return vfs_get_acl(mnt_userns, ecryptfs_dentry_to_lower(dentry), + posix_acl_xattr_name(type)); +} + +static int ecryptfs_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, struct posix_acl *acl, + int type) +{ + int rc; + struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); + struct inode *lower_inode = d_inode(lower_dentry); + + rc = vfs_set_acl(&init_user_ns, lower_dentry, + posix_acl_xattr_name(type), acl); + if (!rc) + fsstack_copy_attr_all(d_inode(dentry), lower_inode); + return rc; +} + const struct inode_operations ecryptfs_symlink_iops = { .get_link = ecryptfs_get_link, .permission = ecryptfs_permission, @@ -1143,6 +1167,8 @@ const struct inode_operations ecryptfs_dir_iops = { .listxattr = ecryptfs_listxattr, .fileattr_get = ecryptfs_fileattr_get, .fileattr_set = ecryptfs_fileattr_set, + .get_acl = ecryptfs_get_acl, + .set_acl = ecryptfs_set_acl, }; const struct inode_operations ecryptfs_main_iops = { @@ -1152,6 +1178,8 @@ const struct inode_operations ecryptfs_main_iops = { .listxattr = ecryptfs_listxattr, .fileattr_get = ecryptfs_fileattr_get, .fileattr_set = ecryptfs_fileattr_set, + .get_acl = ecryptfs_get_acl, + .set_acl = ecryptfs_set_acl, }; static int ecryptfs_xattr_get(const struct xattr_handler *handler, @@ -1182,6 +1210,10 @@ static const struct xattr_handler ecryptfs_xattr_handler = { }; const struct xattr_handler *ecryptfs_xattr_handlers[] = { +#ifdef CONFIG_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif &ecryptfs_xattr_handler, NULL }; diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index ad2a82f2eb4c..2d571343deec 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -371,7 +371,7 @@ int erofs_getattr(struct user_namespace *mnt_userns, const struct path *path, const struct inode_operations erofs_generic_iops = { .getattr = erofs_getattr, .listxattr = erofs_listxattr, - .get_acl = erofs_get_acl, + .get_inode_acl = erofs_get_acl, .fiemap = erofs_fiemap, }; @@ -379,12 +379,12 @@ const struct inode_operations erofs_symlink_iops = { .get_link = page_get_link, .getattr = erofs_getattr, .listxattr = erofs_listxattr, - .get_acl = erofs_get_acl, + .get_inode_acl = erofs_get_acl, }; const struct inode_operations erofs_fast_symlink_iops = { .get_link = simple_get_link, .getattr = erofs_getattr, .listxattr = erofs_listxattr, - .get_acl = erofs_get_acl, + .get_inode_acl = erofs_get_acl, }; diff --git a/fs/erofs/namei.c b/fs/erofs/namei.c index 0dc34721080c..b64a108fac92 100644 --- a/fs/erofs/namei.c +++ b/fs/erofs/namei.c @@ -228,6 +228,6 @@ const struct inode_operations erofs_dir_iops = { .lookup = erofs_lookup, .getattr = erofs_getattr, .listxattr = erofs_listxattr, - .get_acl = erofs_get_acl, + .get_inode_acl = erofs_get_acl, .fiemap = erofs_fiemap, }; diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c index bf298967c5b8..440d5f1e9d47 100644 --- a/fs/ext2/acl.c +++ b/fs/ext2/acl.c @@ -219,11 +219,12 @@ __ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type) * inode->i_mutex: down */ int -ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +ext2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int error; int update_mode = 0; + struct inode *inode = d_inode(dentry); umode_t mode = inode->i_mode; if (type == ACL_TYPE_ACCESS && acl) { diff --git a/fs/ext2/acl.h b/fs/ext2/acl.h index 925ab6287d35..3841becb94ff 100644 --- a/fs/ext2/acl.h +++ b/fs/ext2/acl.h @@ -56,7 +56,7 @@ static inline int ext2_acl_count(size_t size) /* acl.c */ extern struct posix_acl *ext2_get_acl(struct inode *inode, int type, bool rcu); -extern int ext2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +extern int ext2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int ext2_init_acl (struct inode *, struct inode *); diff --git a/fs/ext2/file.c b/fs/ext2/file.c index eb97aa3d700e..6b4bebe982ca 100644 --- a/fs/ext2/file.c +++ b/fs/ext2/file.c @@ -200,7 +200,7 @@ const struct inode_operations ext2_file_inode_operations = { .listxattr = ext2_listxattr, .getattr = ext2_getattr, .setattr = ext2_setattr, - .get_acl = ext2_get_acl, + .get_inode_acl = ext2_get_acl, .set_acl = ext2_set_acl, .fiemap = ext2_fiemap, .fileattr_get = ext2_fileattr_get, diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index 918ab2f9e4c0..e97e77be64f3 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -1652,7 +1652,7 @@ int ext2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, } setattr_copy(&init_user_ns, inode, iattr); if (iattr->ia_valid & ATTR_MODE) - error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); + error = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); mark_inode_dirty(inode); return error; diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index 9125eab85146..c056957221a2 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -427,7 +427,7 @@ const struct inode_operations ext2_dir_inode_operations = { .listxattr = ext2_listxattr, .getattr = ext2_getattr, .setattr = ext2_setattr, - .get_acl = ext2_get_acl, + .get_inode_acl = ext2_get_acl, .set_acl = ext2_set_acl, .tmpfile = ext2_tmpfile, .fileattr_get = ext2_fileattr_get, @@ -438,6 +438,6 @@ const struct inode_operations ext2_special_inode_operations = { .listxattr = ext2_listxattr, .getattr = ext2_getattr, .setattr = ext2_setattr, - .get_acl = ext2_get_acl, + .get_inode_acl = ext2_get_acl, .set_acl = ext2_set_acl, }; diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c index 57e82e25f8e2..a9f89539aeee 100644 --- a/fs/ext4/acl.c +++ b/fs/ext4/acl.c @@ -225,12 +225,13 @@ __ext4_set_acl(handle_t *handle, struct inode *inode, int type, } int -ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +ext4_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { handle_t *handle; int error, credits, retries = 0; size_t acl_size = acl ? ext4_acl_size(acl->a_count) : 0; + struct inode *inode = d_inode(dentry); umode_t mode = inode->i_mode; int update_mode = 0; diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h index 3219669732bf..09c4a8a3b716 100644 --- a/fs/ext4/acl.h +++ b/fs/ext4/acl.h @@ -56,7 +56,7 @@ static inline int ext4_acl_count(size_t size) /* acl.c */ struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu); -int ext4_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ext4_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int ext4_init_acl(handle_t *, struct inode *, struct inode *); diff --git a/fs/ext4/file.c b/fs/ext4/file.c index a7a597c727e6..7ac0a81bd371 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -955,7 +955,7 @@ const struct inode_operations ext4_file_inode_operations = { .setattr = ext4_setattr, .getattr = ext4_file_getattr, .listxattr = ext4_listxattr, - .get_acl = ext4_get_acl, + .get_inode_acl = ext4_get_acl, .set_acl = ext4_set_acl, .fiemap = ext4_fiemap, .fileattr_get = ext4_fileattr_get, diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 9fc1af8e19a3..9aa8b18bdac1 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -870,7 +870,7 @@ static int ext4_xattr_credits_for_new_inode(struct inode *dir, mode_t mode, struct super_block *sb = dir->i_sb; int nblocks = 0; #ifdef CONFIG_EXT4_FS_POSIX_ACL - struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT); + struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT); if (IS_ERR(p)) return PTR_ERR(p); diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2b5ef1b64249..a8e12ce6673d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5550,7 +5550,7 @@ out_mmap_sem: ext4_orphan_del(NULL, inode); if (!error && (ia_valid & ATTR_MODE)) - rc = posix_acl_chmod(mnt_userns, inode, inode->i_mode); + rc = posix_acl_chmod(mnt_userns, dentry, inode->i_mode); err_out: if (error) diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index c08c0aba1883..27a863e1120e 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -4194,7 +4194,7 @@ const struct inode_operations ext4_dir_inode_operations = { .setattr = ext4_setattr, .getattr = ext4_getattr, .listxattr = ext4_listxattr, - .get_acl = ext4_get_acl, + .get_inode_acl = ext4_get_acl, .set_acl = ext4_set_acl, .fiemap = ext4_fiemap, .fileattr_get = ext4_fileattr_get, @@ -4205,6 +4205,6 @@ const struct inode_operations ext4_special_inode_operations = { .setattr = ext4_setattr, .getattr = ext4_getattr, .listxattr = ext4_listxattr, - .get_acl = ext4_get_acl, + .get_inode_acl = ext4_get_acl, .set_acl = ext4_set_acl, }; diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c index 5bbc44a5216e..c1c74aa658ae 100644 --- a/fs/f2fs/acl.c +++ b/fs/f2fs/acl.c @@ -276,9 +276,11 @@ static int __f2fs_set_acl(struct user_namespace *mnt_userns, return error; } -int f2fs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int f2fs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { + struct inode *inode = d_inode(dentry); + if (unlikely(f2fs_cp_error(F2FS_I_SB(inode)))) return -EIO; diff --git a/fs/f2fs/acl.h b/fs/f2fs/acl.h index a26e33cab4ff..ea2bbb3f264b 100644 --- a/fs/f2fs/acl.h +++ b/fs/f2fs/acl.h @@ -34,7 +34,7 @@ struct f2fs_acl_header { #ifdef CONFIG_F2FS_FS_POSIX_ACL extern struct posix_acl *f2fs_get_acl(struct inode *, int, bool); -extern int f2fs_set_acl(struct user_namespace *, struct inode *, +extern int f2fs_set_acl(struct user_namespace *, struct dentry *, struct posix_acl *, int); extern int f2fs_init_acl(struct inode *, struct inode *, struct page *, struct page *); diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 82cda1258227..83df6f6173d3 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1025,7 +1025,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, __setattr_copy(mnt_userns, inode, attr); if (attr->ia_valid & ATTR_MODE) { - err = posix_acl_chmod(mnt_userns, inode, f2fs_get_inode_mode(inode)); + err = posix_acl_chmod(mnt_userns, dentry, f2fs_get_inode_mode(inode)); if (is_inode_flag_set(inode, FI_ACL_MODE)) { if (!err) @@ -1046,7 +1046,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, const struct inode_operations f2fs_file_inode_operations = { .getattr = f2fs_getattr, .setattr = f2fs_setattr, - .get_acl = f2fs_get_acl, + .get_inode_acl = f2fs_get_acl, .set_acl = f2fs_set_acl, .listxattr = f2fs_listxattr, .fiemap = f2fs_fiemap, diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index a389772fd212..c227113b0f26 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -1379,7 +1379,7 @@ const struct inode_operations f2fs_dir_inode_operations = { .tmpfile = f2fs_tmpfile, .getattr = f2fs_getattr, .setattr = f2fs_setattr, - .get_acl = f2fs_get_acl, + .get_inode_acl = f2fs_get_acl, .set_acl = f2fs_set_acl, .listxattr = f2fs_listxattr, .fiemap = f2fs_fiemap, @@ -1397,7 +1397,7 @@ const struct inode_operations f2fs_symlink_inode_operations = { const struct inode_operations f2fs_special_inode_operations = { .getattr = f2fs_getattr, .setattr = f2fs_setattr, - .get_acl = f2fs_get_acl, + .get_inode_acl = f2fs_get_acl, .set_acl = f2fs_set_acl, .listxattr = f2fs_listxattr, }; diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c index 337cb29a8dd5..8edd0f313515 100644 --- a/fs/fuse/acl.c +++ b/fs/fuse/acl.c @@ -53,9 +53,10 @@ struct posix_acl *fuse_get_acl(struct inode *inode, int type, bool rcu) return acl; } -int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int fuse_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { + struct inode *inode = d_inode(dentry); struct fuse_conn *fc = get_fuse_conn(inode); const char *name; int ret; diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index bb97a384dc5d..25e6b0f7e73d 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1935,7 +1935,7 @@ static const struct inode_operations fuse_dir_inode_operations = { .permission = fuse_permission, .getattr = fuse_getattr, .listxattr = fuse_listxattr, - .get_acl = fuse_get_acl, + .get_inode_acl = fuse_get_acl, .set_acl = fuse_set_acl, .fileattr_get = fuse_fileattr_get, .fileattr_set = fuse_fileattr_set, @@ -1957,7 +1957,7 @@ static const struct inode_operations fuse_common_inode_operations = { .permission = fuse_permission, .getattr = fuse_getattr, .listxattr = fuse_listxattr, - .get_acl = fuse_get_acl, + .get_inode_acl = fuse_get_acl, .set_acl = fuse_set_acl, .fileattr_get = fuse_fileattr_get, .fileattr_set = fuse_fileattr_set, diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 98a9cf531873..26a7c524eb70 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -1269,7 +1269,7 @@ extern const struct xattr_handler *fuse_no_acl_xattr_handlers[]; struct posix_acl; struct posix_acl *fuse_get_acl(struct inode *inode, int type, bool rcu); -int fuse_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int fuse_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); /* readdir.c */ diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c index 734d1f05d823..3dcde4912413 100644 --- a/fs/gfs2/acl.c +++ b/fs/gfs2/acl.c @@ -109,9 +109,10 @@ out: return error; } -int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int gfs2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { + struct inode *inode = d_inode(dentry); struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder gh; bool need_unlock = false; diff --git a/fs/gfs2/acl.h b/fs/gfs2/acl.h index cd180ca7c959..b8de8c148f5c 100644 --- a/fs/gfs2/acl.h +++ b/fs/gfs2/acl.h @@ -13,7 +13,7 @@ extern struct posix_acl *gfs2_get_acl(struct inode *inode, int type, bool rcu); extern int __gfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type); -extern int gfs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +extern int gfs2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); #endif /* __ACL_DOT_H__ */ diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c index 04a201584fa7..1371e067d2a7 100644 --- a/fs/gfs2/inode.c +++ b/fs/gfs2/inode.c @@ -1997,7 +1997,7 @@ static int gfs2_setattr(struct user_namespace *mnt_userns, else { error = gfs2_setattr_simple(inode, attr); if (!error && attr->ia_valid & ATTR_MODE) - error = posix_acl_chmod(&init_user_ns, inode, + error = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); } @@ -2149,7 +2149,7 @@ static const struct inode_operations gfs2_file_iops = { .getattr = gfs2_getattr, .listxattr = gfs2_listxattr, .fiemap = gfs2_fiemap, - .get_acl = gfs2_get_acl, + .get_inode_acl = gfs2_get_acl, .set_acl = gfs2_set_acl, .update_time = gfs2_update_time, .fileattr_get = gfs2_fileattr_get, @@ -2171,7 +2171,7 @@ static const struct inode_operations gfs2_dir_iops = { .getattr = gfs2_getattr, .listxattr = gfs2_listxattr, .fiemap = gfs2_fiemap, - .get_acl = gfs2_get_acl, + .get_inode_acl = gfs2_get_acl, .set_acl = gfs2_set_acl, .update_time = gfs2_update_time, .atomic_open = gfs2_atomic_open, diff --git a/fs/internal.h b/fs/internal.h index 6f0386b34fae..e377eb7bbe7f 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -232,5 +232,26 @@ ssize_t do_getxattr(struct user_namespace *mnt_userns, int setxattr_copy(const char __user *name, struct xattr_ctx *ctx); int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry, struct xattr_ctx *ctx); +int may_write_xattr(struct user_namespace *mnt_userns, struct inode *inode); + +#ifdef CONFIG_FS_POSIX_ACL +int do_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, const void *kvalue, size_t size); +ssize_t do_get_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, void *kvalue, size_t size); +#else +static inline int do_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + const void *kvalue, size_t size) +{ + return -EOPNOTSUPP; +} +static inline ssize_t do_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + void *kvalue, size_t size) +{ + return -EOPNOTSUPP; +} +#endif ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos); diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c index e945e3484788..8bb58ce5c06c 100644 --- a/fs/jffs2/acl.c +++ b/fs/jffs2/acl.c @@ -229,10 +229,11 @@ static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *a return rc; } -int jffs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int jffs2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int rc, xprefix; + struct inode *inode = d_inode(dentry); switch (type) { case ACL_TYPE_ACCESS: diff --git a/fs/jffs2/acl.h b/fs/jffs2/acl.h index 9d9fb7cf093e..ca36a6eca594 100644 --- a/fs/jffs2/acl.h +++ b/fs/jffs2/acl.h @@ -28,7 +28,7 @@ struct jffs2_acl_header { #ifdef CONFIG_JFFS2_FS_POSIX_ACL struct posix_acl *jffs2_get_acl(struct inode *inode, int type, bool rcu); -int jffs2_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int jffs2_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int jffs2_init_acl_pre(struct inode *, struct inode *, umode_t *); extern int jffs2_init_acl_post(struct inode *); diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c index c0aabbcbfd58..f399b390b5f6 100644 --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -62,7 +62,7 @@ const struct inode_operations jffs2_dir_inode_operations = .rmdir = jffs2_rmdir, .mknod = jffs2_mknod, .rename = jffs2_rename, - .get_acl = jffs2_get_acl, + .get_inode_acl = jffs2_get_acl, .set_acl = jffs2_set_acl, .setattr = jffs2_setattr, .listxattr = jffs2_listxattr, diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c index ba86acbe12d3..3cf71befa475 100644 --- a/fs/jffs2/file.c +++ b/fs/jffs2/file.c @@ -64,7 +64,7 @@ const struct file_operations jffs2_file_operations = const struct inode_operations jffs2_file_inode_operations = { - .get_acl = jffs2_get_acl, + .get_inode_acl = jffs2_get_acl, .set_acl = jffs2_set_acl, .setattr = jffs2_setattr, .listxattr = jffs2_listxattr, diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c index 39cec28096a7..66af51c41619 100644 --- a/fs/jffs2/fs.c +++ b/fs/jffs2/fs.c @@ -202,7 +202,7 @@ int jffs2_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, rc = jffs2_do_setattr(inode, iattr); if (!rc && (iattr->ia_valid & ATTR_MODE)) - rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); + rc = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); return rc; } diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c index a653f34c6e26..3b667eccc73b 100644 --- a/fs/jfs/acl.c +++ b/fs/jfs/acl.c @@ -94,12 +94,13 @@ out: return rc; } -int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int jfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int rc; tid_t tid; int update_mode = 0; + struct inode *inode = d_inode(dentry); umode_t mode = inode->i_mode; tid = txBegin(inode->i_sb, 0); diff --git a/fs/jfs/file.c b/fs/jfs/file.c index 332dc9ac47a9..88663465aecd 100644 --- a/fs/jfs/file.c +++ b/fs/jfs/file.c @@ -123,7 +123,7 @@ int jfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, mark_inode_dirty(inode); if (iattr->ia_valid & ATTR_MODE) - rc = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); + rc = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); return rc; } @@ -133,7 +133,7 @@ const struct inode_operations jfs_file_inode_operations = { .fileattr_get = jfs_fileattr_get, .fileattr_set = jfs_fileattr_set, #ifdef CONFIG_JFS_POSIX_ACL - .get_acl = jfs_get_acl, + .get_inode_acl = jfs_get_acl, .set_acl = jfs_set_acl, #endif }; diff --git a/fs/jfs/jfs_acl.h b/fs/jfs/jfs_acl.h index 3de40286d31f..f0704a25835f 100644 --- a/fs/jfs/jfs_acl.h +++ b/fs/jfs/jfs_acl.h @@ -8,7 +8,7 @@ #ifdef CONFIG_JFS_POSIX_ACL struct posix_acl *jfs_get_acl(struct inode *inode, int type, bool rcu); -int jfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int jfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); int jfs_init_acl(tid_t, struct inode *, struct inode *); diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c index 9db4f5789c0e..b50afaf7966f 100644 --- a/fs/jfs/namei.c +++ b/fs/jfs/namei.c @@ -1525,7 +1525,7 @@ const struct inode_operations jfs_dir_inode_operations = { .fileattr_get = jfs_fileattr_get, .fileattr_set = jfs_fileattr_set, #ifdef CONFIG_JFS_POSIX_ACL - .get_acl = jfs_get_acl, + .get_inode_acl = jfs_get_acl, .set_acl = jfs_set_acl, #endif }; diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index b2fc85d440d0..9306e10753f9 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -2487,9 +2487,9 @@ static void ksmbd_acls_fattr(struct smb_fattr *fattr, fattr->cf_dacls = NULL; if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { - fattr->cf_acls = get_acl(inode, ACL_TYPE_ACCESS); + fattr->cf_acls = get_inode_acl(inode, ACL_TYPE_ACCESS); if (S_ISDIR(inode->i_mode)) - fattr->cf_dacls = get_acl(inode, ACL_TYPE_DEFAULT); + fattr->cf_dacls = get_inode_acl(inode, ACL_TYPE_DEFAULT); } } @@ -2956,7 +2956,7 @@ int smb2_open(struct ksmbd_work *work) struct inode *inode = d_inode(path.dentry); posix_acl_rc = ksmbd_vfs_inherit_posix_acl(user_ns, - inode, + path.dentry, d_inode(path.dentry->d_parent)); if (posix_acl_rc) ksmbd_debug(SMB, "inherit posix acl failed : %d\n", posix_acl_rc); @@ -2972,7 +2972,7 @@ int smb2_open(struct ksmbd_work *work) if (rc) { if (posix_acl_rc) ksmbd_vfs_set_init_posix_acl(user_ns, - inode); + path.dentry); if (test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_ACL_XATTR)) { diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c index b05ff9b146b5..ab5c68cc0e13 100644 --- a/fs/ksmbd/smbacl.c +++ b/fs/ksmbd/smbacl.c @@ -1289,7 +1289,7 @@ int smb_check_perm_dacl(struct ksmbd_conn *conn, const struct path *path, } if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) { - posix_acls = get_acl(d_inode(path->dentry), ACL_TYPE_ACCESS); + posix_acls = get_inode_acl(d_inode(path->dentry), ACL_TYPE_ACCESS); if (posix_acls && !found) { unsigned int id = -1; @@ -1386,14 +1386,14 @@ int set_info_sec(struct ksmbd_conn *conn, struct ksmbd_tree_connect *tcon, ksmbd_vfs_remove_acl_xattrs(user_ns, path->dentry); /* Update posix acls */ if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && fattr.cf_dacls) { - rc = set_posix_acl(user_ns, inode, + rc = set_posix_acl(user_ns, path->dentry, ACL_TYPE_ACCESS, fattr.cf_acls); if (rc < 0) ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", rc); if (S_ISDIR(inode->i_mode) && fattr.cf_dacls) { - rc = set_posix_acl(user_ns, inode, + rc = set_posix_acl(user_ns, path->dentry, ACL_TYPE_DEFAULT, fattr.cf_dacls); if (rc) ksmbd_debug(SMB, diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c index 72e981c9a572..ff0e7a4fcd4d 100644 --- a/fs/ksmbd/vfs.c +++ b/fs/ksmbd/vfs.c @@ -1321,7 +1321,7 @@ int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns, sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) || !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT, sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) { - err = ksmbd_vfs_remove_xattr(user_ns, dentry, name); + err = vfs_remove_acl(user_ns, dentry, name); if (err) ksmbd_debug(SMB, "remove acl xattr failed : %s\n", name); @@ -1375,7 +1375,7 @@ static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct user_namespac if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) return NULL; - posix_acls = get_acl(inode, acl_type); + posix_acls = get_inode_acl(inode, acl_type); if (!posix_acls) return NULL; @@ -1824,10 +1824,11 @@ void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) } int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns, - struct inode *inode) + struct dentry *dentry) { struct posix_acl_state acl_state; struct posix_acl *acls; + struct inode *inode = d_inode(dentry); int rc; if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) @@ -1856,14 +1857,13 @@ int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns, return -ENOMEM; } posix_state_to_acl(&acl_state, acls->a_entries); - rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls); + rc = set_posix_acl(user_ns, dentry, ACL_TYPE_ACCESS, acls); if (rc < 0) ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", rc); else if (S_ISDIR(inode->i_mode)) { posix_state_to_acl(&acl_state, acls->a_entries); - rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT, - acls); + rc = set_posix_acl(user_ns, dentry, ACL_TYPE_DEFAULT, acls); if (rc < 0) ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", rc); @@ -1874,16 +1874,17 @@ int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns, } int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns, - struct inode *inode, struct inode *parent_inode) + struct dentry *dentry, struct inode *parent_inode) { struct posix_acl *acls; struct posix_acl_entry *pace; + struct inode *inode = d_inode(dentry); int rc, i; if (!IS_ENABLED(CONFIG_FS_POSIX_ACL)) return -EOPNOTSUPP; - acls = get_acl(parent_inode, ACL_TYPE_DEFAULT); + acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT); if (!acls) return -ENOENT; pace = acls->a_entries; @@ -1895,12 +1896,12 @@ int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns, } } - rc = set_posix_acl(user_ns, inode, ACL_TYPE_ACCESS, acls); + rc = set_posix_acl(user_ns, dentry, ACL_TYPE_ACCESS, acls); if (rc < 0) ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n", rc); if (S_ISDIR(inode->i_mode)) { - rc = set_posix_acl(user_ns, inode, ACL_TYPE_DEFAULT, + rc = set_posix_acl(user_ns, dentry, ACL_TYPE_DEFAULT, acls); if (rc < 0) ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n", diff --git a/fs/ksmbd/vfs.h b/fs/ksmbd/vfs.h index 593059ca8511..0d73d735cc39 100644 --- a/fs/ksmbd/vfs.h +++ b/fs/ksmbd/vfs.h @@ -160,8 +160,8 @@ int ksmbd_vfs_get_dos_attrib_xattr(struct user_namespace *user_ns, struct dentry *dentry, struct xattr_dos_attrib *da); int ksmbd_vfs_set_init_posix_acl(struct user_namespace *user_ns, - struct inode *inode); + struct dentry *dentry); int ksmbd_vfs_inherit_posix_acl(struct user_namespace *user_ns, - struct inode *inode, + struct dentry *dentry, struct inode *parent_inode); #endif /* __KSMBD_VFS_H__ */ diff --git a/fs/namei.c b/fs/namei.c index 9155ecb547ce..7bfebfa993ed 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -297,13 +297,13 @@ static int check_acl(struct user_namespace *mnt_userns, acl = get_cached_acl_rcu(inode, ACL_TYPE_ACCESS); if (!acl) return -EAGAIN; - /* no ->get_acl() calls in RCU mode... */ + /* no ->get_inode_acl() calls in RCU mode... */ if (is_uncached_acl(acl)) return -ECHILD; return posix_acl_permission(mnt_userns, inode, acl, mask); } - acl = get_acl(inode, ACL_TYPE_ACCESS); + acl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(acl)) return PTR_ERR(acl); if (acl) { diff --git a/fs/nfs/nfs3_fs.h b/fs/nfs/nfs3_fs.h index 03a4e679fd99..df9ca56db347 100644 --- a/fs/nfs/nfs3_fs.h +++ b/fs/nfs/nfs3_fs.h @@ -12,7 +12,7 @@ */ #ifdef CONFIG_NFS_V3_ACL extern struct posix_acl *nfs3_get_acl(struct inode *inode, int type, bool rcu); -extern int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +extern int nfs3_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, struct posix_acl *dfacl); diff --git a/fs/nfs/nfs3acl.c b/fs/nfs/nfs3acl.c index 93de0b58647a..74d11e3c4205 100644 --- a/fs/nfs/nfs3acl.c +++ b/fs/nfs/nfs3acl.c @@ -255,23 +255,24 @@ int nfs3_proc_setacls(struct inode *inode, struct posix_acl *acl, } -int nfs3_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int nfs3_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { struct posix_acl *orig = acl, *dfacl = NULL, *alloc; + struct inode *inode = d_inode(dentry); int status; if (S_ISDIR(inode->i_mode)) { switch(type) { case ACL_TYPE_ACCESS: - alloc = get_acl(inode, ACL_TYPE_DEFAULT); + alloc = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(alloc)) goto fail; dfacl = alloc; break; case ACL_TYPE_DEFAULT: - alloc = get_acl(inode, ACL_TYPE_ACCESS); + alloc = get_inode_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR(alloc)) goto fail; dfacl = acl; @@ -312,7 +313,7 @@ nfs3_list_one_acl(struct inode *inode, int type, const char *name, void *data, struct posix_acl *acl; char *p = data + *result; - acl = get_acl(inode, type); + acl = get_inode_acl(inode, type); if (IS_ERR_OR_NULL(acl)) return 0; diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index 2e7579626cf0..4bf208a0a8e9 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -998,7 +998,7 @@ static const struct inode_operations nfs3_dir_inode_operations = { .setattr = nfs_setattr, #ifdef CONFIG_NFS_V3_ACL .listxattr = nfs3_listxattr, - .get_acl = nfs3_get_acl, + .get_inode_acl = nfs3_get_acl, .set_acl = nfs3_set_acl, #endif }; @@ -1009,7 +1009,7 @@ static const struct inode_operations nfs3_file_inode_operations = { .setattr = nfs_setattr, #ifdef CONFIG_NFS_V3_ACL .listxattr = nfs3_listxattr, - .get_acl = nfs3_get_acl, + .get_inode_acl = nfs3_get_acl, .set_acl = nfs3_set_acl, #endif }; diff --git a/fs/nfsd/nfs2acl.c b/fs/nfsd/nfs2acl.c index 13e6e6897f6c..c43c25a8da2e 100644 --- a/fs/nfsd/nfs2acl.c +++ b/fs/nfsd/nfs2acl.c @@ -55,7 +55,7 @@ static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp) goto out; if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { - acl = get_acl(inode, ACL_TYPE_ACCESS); + acl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (acl == NULL) { /* Solaris returns the inode's minimum ACL. */ acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); @@ -69,7 +69,7 @@ static __be32 nfsacld_proc_getacl(struct svc_rqst *rqstp) if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { /* Check how Solaris handles requests for the Default ACL of a non-directory! */ - acl = get_acl(inode, ACL_TYPE_DEFAULT); + acl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) { resp->status = nfserrno(PTR_ERR(acl)); goto fail; @@ -113,11 +113,11 @@ static __be32 nfsacld_proc_setacl(struct svc_rqst *rqstp) inode_lock(inode); - error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS, + error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_ACCESS, argp->acl_access); if (error) goto out_drop_lock; - error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT, + error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_DEFAULT, argp->acl_default); if (error) goto out_drop_lock; diff --git a/fs/nfsd/nfs3acl.c b/fs/nfsd/nfs3acl.c index 2fb9ee356455..9daa621817d8 100644 --- a/fs/nfsd/nfs3acl.c +++ b/fs/nfsd/nfs3acl.c @@ -47,7 +47,7 @@ static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp) resp->mask = argp->mask; if (resp->mask & (NFS_ACL|NFS_ACLCNT)) { - acl = get_acl(inode, ACL_TYPE_ACCESS); + acl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (acl == NULL) { /* Solaris returns the inode's minimum ACL. */ acl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); @@ -61,7 +61,7 @@ static __be32 nfsd3_proc_getacl(struct svc_rqst *rqstp) if (resp->mask & (NFS_DFACL|NFS_DFACLCNT)) { /* Check how Solaris handles requests for the Default ACL of a non-directory! */ - acl = get_acl(inode, ACL_TYPE_DEFAULT); + acl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) { resp->status = nfserrno(PTR_ERR(acl)); goto fail; @@ -103,11 +103,11 @@ static __be32 nfsd3_proc_setacl(struct svc_rqst *rqstp) inode_lock(inode); - error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_ACCESS, + error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_ACCESS, argp->acl_access); if (error) goto out_drop_lock; - error = set_posix_acl(&init_user_ns, inode, ACL_TYPE_DEFAULT, + error = set_posix_acl(&init_user_ns, fh->fh_dentry, ACL_TYPE_DEFAULT, argp->acl_default); out_drop_lock: diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c index bb8e2f6d7d03..518203821790 100644 --- a/fs/nfsd/nfs4acl.c +++ b/fs/nfsd/nfs4acl.c @@ -135,7 +135,7 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, unsigned int flags = 0; int size = 0; - pacl = get_acl(inode, ACL_TYPE_ACCESS); + pacl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (!pacl) pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); @@ -147,7 +147,7 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, if (S_ISDIR(inode->i_mode)) { flags = NFS4_ACL_DIR; - dpacl = get_acl(inode, ACL_TYPE_DEFAULT); + dpacl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (IS_ERR(dpacl)) { error = PTR_ERR(dpacl); goto rel_pacl; diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index a996cbda3b88..08a929607641 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -480,12 +480,12 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, attr->na_seclabel->data, attr->na_seclabel->len); if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_pacl) attr->na_aclerr = set_posix_acl(&init_user_ns, - inode, ACL_TYPE_ACCESS, + dentry, ACL_TYPE_ACCESS, attr->na_pacl); if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && !attr->na_aclerr && attr->na_dpacl && S_ISDIR(inode->i_mode)) attr->na_aclerr = set_posix_acl(&init_user_ns, - inode, ACL_TYPE_DEFAULT, + dentry, ACL_TYPE_DEFAULT, attr->na_dpacl); inode_unlock(inode); if (size_change) diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index 4f2ffc7ef296..c5e4a886593d 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -802,7 +802,7 @@ int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, setattr_copy(mnt_userns, inode, attr); if (mode != inode->i_mode) { - err = ntfs_acl_chmod(mnt_userns, inode); + err = ntfs_acl_chmod(mnt_userns, dentry); if (err) goto out; @@ -1255,7 +1255,7 @@ const struct inode_operations ntfs_file_inode_operations = { .setattr = ntfs3_setattr, .listxattr = ntfs_listxattr, .permission = ntfs_permission, - .get_acl = ntfs_get_acl, + .get_inode_acl = ntfs_get_acl, .set_acl = ntfs_set_acl, .fiemap = ntfs_fiemap, }; diff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c index bc22cc321a74..053cc0e0f8b5 100644 --- a/fs/ntfs3/namei.c +++ b/fs/ntfs3/namei.c @@ -367,7 +367,7 @@ const struct inode_operations ntfs_dir_inode_operations = { .mknod = ntfs_mknod, .rename = ntfs_rename, .permission = ntfs_permission, - .get_acl = ntfs_get_acl, + .get_inode_acl = ntfs_get_acl, .set_acl = ntfs_set_acl, .setattr = ntfs3_setattr, .getattr = ntfs_getattr, @@ -379,7 +379,7 @@ const struct inode_operations ntfs_special_inode_operations = { .setattr = ntfs3_setattr, .getattr = ntfs_getattr, .listxattr = ntfs_listxattr, - .get_acl = ntfs_get_acl, + .get_inode_acl = ntfs_get_acl, .set_acl = ntfs_set_acl, }; // clang-format on diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h index 2c791222c4e2..a4d292809a33 100644 --- a/fs/ntfs3/ntfs_fs.h +++ b/fs/ntfs3/ntfs_fs.h @@ -843,7 +843,7 @@ int ntfs_cmp_names_cpu(const struct cpu_str *uni1, const struct le_str *uni2, /* globals from xattr.c */ #ifdef CONFIG_NTFS3_FS_POSIX_ACL struct posix_acl *ntfs_get_acl(struct inode *inode, int type, bool rcu); -int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ntfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, struct inode *dir); @@ -852,7 +852,7 @@ int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, #define ntfs_set_acl NULL #endif -int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode); +int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct dentry *dentry); int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode, int mask); ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size); diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c index 7de8718c68a9..aafe98ee0b21 100644 --- a/fs/ntfs3/xattr.c +++ b/fs/ntfs3/xattr.c @@ -619,10 +619,10 @@ out: /* * ntfs_set_acl - inode_operations::set_acl */ -int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ntfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { - return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false); + return ntfs_set_acl_ex(mnt_userns, d_inode(dentry), acl, type, false); } /* @@ -664,8 +664,9 @@ int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode, /* * ntfs_acl_chmod - Helper for ntfs3_setattr(). */ -int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) +int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct dentry *dentry) { + struct inode *inode = d_inode(dentry); struct super_block *sb = inode->i_sb; if (!(sb->s_flags & SB_POSIXACL)) @@ -674,7 +675,7 @@ int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode) if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; - return posix_acl_chmod(mnt_userns, inode, inode->i_mode); + return posix_acl_chmod(mnt_userns, dentry, inode->i_mode); } /* diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c index 23a72a423955..9f19cf9a5a9f 100644 --- a/fs/ocfs2/acl.c +++ b/fs/ocfs2/acl.c @@ -260,12 +260,13 @@ static int ocfs2_set_acl(handle_t *handle, return ret; } -int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { struct buffer_head *bh = NULL; int status, had_lock; struct ocfs2_lock_holder oh; + struct inode *inode = d_inode(dentry); had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh); if (had_lock < 0) diff --git a/fs/ocfs2/acl.h b/fs/ocfs2/acl.h index 95a57c888ab6..a897c4e41b26 100644 --- a/fs/ocfs2/acl.h +++ b/fs/ocfs2/acl.h @@ -17,7 +17,7 @@ struct ocfs2_acl_entry { }; struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu); -int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int ocfs2_acl_chmod(struct inode *, struct buffer_head *); extern int ocfs2_init_acl(handle_t *, struct inode *, struct inode *, diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 9c67edd215d5..af900aaa9275 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2712,7 +2712,7 @@ const struct inode_operations ocfs2_file_iops = { .permission = ocfs2_permission, .listxattr = ocfs2_listxattr, .fiemap = ocfs2_fiemap, - .get_acl = ocfs2_iop_get_acl, + .get_inode_acl = ocfs2_iop_get_acl, .set_acl = ocfs2_iop_set_acl, .fileattr_get = ocfs2_fileattr_get, .fileattr_set = ocfs2_fileattr_set, @@ -2722,7 +2722,7 @@ const struct inode_operations ocfs2_special_file_iops = { .setattr = ocfs2_setattr, .getattr = ocfs2_getattr, .permission = ocfs2_permission, - .get_acl = ocfs2_iop_get_acl, + .get_inode_acl = ocfs2_iop_get_acl, .set_acl = ocfs2_iop_set_acl, }; diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c index 05f32989bad6..a8fd51afb794 100644 --- a/fs/ocfs2/namei.c +++ b/fs/ocfs2/namei.c @@ -2915,7 +2915,7 @@ const struct inode_operations ocfs2_dir_iops = { .permission = ocfs2_permission, .listxattr = ocfs2_listxattr, .fiemap = ocfs2_fiemap, - .get_acl = ocfs2_iop_get_acl, + .get_inode_acl = ocfs2_iop_get_acl, .set_acl = ocfs2_iop_set_acl, .fileattr_get = ocfs2_fileattr_get, .fileattr_set = ocfs2_fileattr_set, diff --git a/fs/orangefs/acl.c b/fs/orangefs/acl.c index 605e5a3506ec..c5da2091cefb 100644 --- a/fs/orangefs/acl.c +++ b/fs/orangefs/acl.c @@ -64,8 +64,7 @@ struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu) return acl; } -static int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, - int type) +int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type) { int error = 0; void *value = NULL; @@ -119,12 +118,13 @@ out: return error; } -int orangefs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int orangefs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int error; struct iattr iattr; int rc; + struct inode *inode = d_inode(dentry); memset(&iattr, 0, sizeof iattr); @@ -153,46 +153,7 @@ int orangefs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, rc = __orangefs_set_acl(inode, acl, type); if (!rc && (iattr.ia_valid == ATTR_MODE)) - rc = __orangefs_setattr(inode, &iattr); + rc = __orangefs_setattr_mode(dentry, &iattr); return rc; } - -int orangefs_init_acl(struct inode *inode, struct inode *dir) -{ - struct posix_acl *default_acl, *acl; - umode_t mode = inode->i_mode; - struct iattr iattr; - int error = 0; - - error = posix_acl_create(dir, &mode, &default_acl, &acl); - if (error) - return error; - - if (default_acl) { - error = __orangefs_set_acl(inode, default_acl, - ACL_TYPE_DEFAULT); - posix_acl_release(default_acl); - } else { - inode->i_default_acl = NULL; - } - - if (acl) { - if (!error) - error = __orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS); - posix_acl_release(acl); - } else { - inode->i_acl = NULL; - } - - /* If mode of the inode was changed, then do a forcible ->setattr */ - if (mode != inode->i_mode) { - memset(&iattr, 0, sizeof iattr); - inode->i_mode = mode; - iattr.ia_mode = mode; - iattr.ia_valid |= ATTR_MODE; - __orangefs_setattr(inode, &iattr); - } - - return error; -} diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c index b3bbb5a5787a..370bd3bbf5e4 100644 --- a/fs/orangefs/inode.c +++ b/fs/orangefs/inode.c @@ -828,15 +828,23 @@ again: spin_unlock(&inode->i_lock); mark_inode_dirty(inode); - if (iattr->ia_valid & ATTR_MODE) - /* change mod on a file that has ACLs */ - ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); - ret = 0; out: return ret; } +int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr) +{ + int ret; + struct inode *inode = d_inode(dentry); + + ret = __orangefs_setattr(inode, iattr); + /* change mode on a file that has ACLs */ + if (!ret && (iattr->ia_valid & ATTR_MODE)) + ret = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); + return ret; +} + /* * Change attributes of an object referenced by dentry. */ @@ -849,7 +857,7 @@ int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, ret = setattr_prepare(&init_user_ns, dentry, iattr); if (ret) goto out; - ret = __orangefs_setattr(d_inode(dentry), iattr); + ret = __orangefs_setattr_mode(dentry, iattr); sync_inode_metadata(d_inode(dentry), 1); out: gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n", @@ -967,7 +975,7 @@ static int orangefs_fileattr_set(struct user_namespace *mnt_userns, /* ORANGEFS2 implementation of VFS inode operations for files */ static const struct inode_operations orangefs_file_inode_operations = { - .get_acl = orangefs_get_acl, + .get_inode_acl = orangefs_get_acl, .set_acl = orangefs_set_acl, .setattr = orangefs_setattr, .getattr = orangefs_getattr, @@ -1097,8 +1105,9 @@ struct inode *orangefs_iget(struct super_block *sb, * Allocate an inode for a newly created file and insert it into the inode hash. */ struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, - int mode, dev_t dev, struct orangefs_object_kref *ref) + umode_t mode, dev_t dev, struct orangefs_object_kref *ref) { + struct posix_acl *acl = NULL, *default_acl = NULL; unsigned long hash = orangefs_handle_hash(ref); struct inode *inode; int error; @@ -1115,6 +1124,10 @@ struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, if (!inode) return ERR_PTR(-ENOMEM); + error = posix_acl_create(dir, &mode, &default_acl, &acl); + if (error) + goto out_iput; + orangefs_set_inode(inode, ref); inode->i_ino = hash; /* needed for stat etc */ @@ -1125,6 +1138,19 @@ struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, orangefs_init_iops(inode); inode->i_rdev = dev; + if (default_acl) { + error = __orangefs_set_acl(inode, default_acl, + ACL_TYPE_DEFAULT); + if (error) + goto out_iput; + } + + if (acl) { + error = __orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS); + if (error) + goto out_iput; + } + error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref); if (error < 0) goto out_iput; @@ -1132,10 +1158,22 @@ struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, gossip_debug(GOSSIP_INODE_DEBUG, "Initializing ACL's for inode %pU\n", get_khandle_from_ino(inode)); - orangefs_init_acl(inode, dir); + if (mode != inode->i_mode) { + struct iattr iattr = { + .ia_mode = mode, + .ia_valid = ATTR_MODE, + }; + inode->i_mode = mode; + __orangefs_setattr(inode, &iattr); + __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); + } + posix_acl_release(acl); + posix_acl_release(default_acl); return inode; out_iput: iput(inode); + posix_acl_release(acl); + posix_acl_release(default_acl); return ERR_PTR(error); } diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c index 600e8eee541f..75c1a3dcf68c 100644 --- a/fs/orangefs/namei.c +++ b/fs/orangefs/namei.c @@ -430,7 +430,7 @@ static int orangefs_rename(struct user_namespace *mnt_userns, /* ORANGEFS implementation of VFS inode operations for directories */ const struct inode_operations orangefs_dir_inode_operations = { .lookup = orangefs_lookup, - .get_acl = orangefs_get_acl, + .get_inode_acl = orangefs_get_acl, .set_acl = orangefs_set_acl, .create = orangefs_create, .unlink = orangefs_unlink, diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h index b5940ec1836a..6e0cc01b3a14 100644 --- a/fs/orangefs/orangefs-kernel.h +++ b/fs/orangefs/orangefs-kernel.h @@ -103,13 +103,13 @@ enum orangefs_vfs_op_states { #define ORANGEFS_CACHE_CREATE_FLAGS 0 #endif -extern int orangefs_init_acl(struct inode *inode, struct inode *dir); extern const struct xattr_handler *orangefs_xattr_handlers[]; extern struct posix_acl *orangefs_get_acl(struct inode *inode, int type, bool rcu); extern int orangefs_set_acl(struct user_namespace *mnt_userns, - struct inode *inode, struct posix_acl *acl, + struct dentry *dentry, struct posix_acl *acl, int type); +int __orangefs_set_acl(struct inode *inode, struct posix_acl *acl, int type); /* * orangefs data structures @@ -356,11 +356,12 @@ void fsid_key_table_finalize(void); vm_fault_t orangefs_page_mkwrite(struct vm_fault *); struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir, - int mode, + umode_t mode, dev_t dev, struct orangefs_object_kref *ref); int __orangefs_setattr(struct inode *, struct iattr *); +int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr); int orangefs_setattr(struct user_namespace *, struct dentry *, struct iattr *); int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path, diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index f436d8847f08..6e4e65ee050d 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -44,6 +44,35 @@ static bool ovl_must_copy_xattr(const char *name) !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); } +static int ovl_copy_acl(struct ovl_fs *ofs, const struct path *path, + struct dentry *dentry, const char *acl_name) +{ + int err; + struct posix_acl *clone, *real_acl = NULL; + + real_acl = ovl_get_acl_path(path, acl_name, false); + if (!real_acl) + return 0; + + if (IS_ERR(real_acl)) { + err = PTR_ERR(real_acl); + if (err == -ENODATA || err == -EOPNOTSUPP) + return 0; + return err; + } + + clone = posix_acl_clone(real_acl, GFP_KERNEL); + posix_acl_release(real_acl); /* release original acl */ + if (!clone) + return -ENOMEM; + + err = ovl_do_set_acl(ofs, dentry, acl_name, clone); + + /* release cloned acl */ + posix_acl_release(clone); + return err; +} + int ovl_copy_xattr(struct super_block *sb, const struct path *oldpath, struct dentry *new) { struct dentry *old = oldpath->dentry; @@ -93,6 +122,15 @@ int ovl_copy_xattr(struct super_block *sb, const struct path *oldpath, struct de error = 0; continue; /* Discard */ } + + if (is_posix_acl_xattr(name)) { + error = ovl_copy_acl(OVL_FS(sb), oldpath, new, name); + if (!error) + continue; + /* POSIX ACLs must be copied. */ + break; + } + retry: size = ovl_do_getxattr(oldpath, name, value, value_size); if (size == -ERANGE) diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 6b03457f72bb..cbb569d5d234 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -435,28 +435,12 @@ out: } static int ovl_set_upper_acl(struct ovl_fs *ofs, struct dentry *upperdentry, - const char *name, const struct posix_acl *acl) + const char *acl_name, struct posix_acl *acl) { - void *buffer; - size_t size; - int err; - if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) return 0; - size = posix_acl_xattr_size(acl->a_count); - buffer = kmalloc(size, GFP_KERNEL); - if (!buffer) - return -ENOMEM; - - err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); - if (err < 0) - goto out_free; - - err = ovl_do_setxattr(ofs, upperdentry, name, buffer, size, XATTR_CREATE); -out_free: - kfree(buffer); - return err; + return ovl_do_set_acl(ofs, upperdentry, acl_name, acl); } static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, @@ -1311,7 +1295,9 @@ const struct inode_operations ovl_dir_inode_operations = { .permission = ovl_permission, .getattr = ovl_getattr, .listxattr = ovl_listxattr, + .get_inode_acl = ovl_get_inode_acl, .get_acl = ovl_get_acl, + .set_acl = ovl_set_acl, .update_time = ovl_update_time, .fileattr_get = ovl_fileattr_get, .fileattr_set = ovl_fileattr_set, diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 9e61511de7a7..ee6dfa577c93 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -14,6 +14,8 @@ #include <linux/fileattr.h> #include <linux/security.h> #include <linux/namei.h> +#include <linux/posix_acl.h> +#include <linux/posix_acl_xattr.h> #include "overlayfs.h" @@ -460,7 +462,7 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size) * of the POSIX ACLs retrieved from the lower layer to this function to not * alter the POSIX ACLs for the underlying filesystem. */ -static void ovl_idmap_posix_acl(struct inode *realinode, +static void ovl_idmap_posix_acl(const struct inode *realinode, struct user_namespace *mnt_userns, struct posix_acl *acl) { @@ -485,6 +487,64 @@ static void ovl_idmap_posix_acl(struct inode *realinode, } /* + * The @noperm argument is used to skip permission checking and is a temporary + * measure. Quoting Miklos from an earlier discussion: + * + * > So there are two paths to getting an acl: + * > 1) permission checking and 2) retrieving the value via getxattr(2). + * > This is a similar situation as reading a symlink vs. following it. + * > When following a symlink overlayfs always reads the link on the + * > underlying fs just as if it was a readlink(2) call, calling + * > security_inode_readlink() instead of security_inode_follow_link(). + * > This is logical: we are reading the link from the underlying storage, + * > and following it on overlayfs. + * > + * > Applying the same logic to acl: we do need to call the + * > security_inode_getxattr() on the underlying fs, even if just want to + * > check permissions on overlay. This is currently not done, which is an + * > inconsistency. + * > + * > Maybe adding the check to ovl_get_acl() is the right way to go, but + * > I'm a little afraid of a performance regression. Will look into that. + * + * Until we have made a decision allow this helper to take the @noperm + * argument. We should hopefully be able to remove it soon. + */ +struct posix_acl *ovl_get_acl_path(const struct path *path, + const char *acl_name, bool noperm) +{ + struct posix_acl *real_acl, *clone; + struct user_namespace *mnt_userns; + struct inode *realinode = d_inode(path->dentry); + + mnt_userns = mnt_user_ns(path->mnt); + + if (noperm) + real_acl = get_inode_acl(realinode, posix_acl_type(acl_name)); + else + real_acl = vfs_get_acl(mnt_userns, path->dentry, acl_name); + if (IS_ERR_OR_NULL(real_acl)) + return real_acl; + + if (!is_idmapped_mnt(path->mnt)) + return real_acl; + + /* + * We cannot alter the ACLs returned from the relevant layer as that + * would alter the cached values filesystem wide for the lower + * filesystem. Instead we can clone the ACLs and then apply the + * relevant idmapping of the layer. + */ + clone = posix_acl_clone(real_acl, GFP_KERNEL); + posix_acl_release(real_acl); /* release original acl */ + if (!clone) + return ERR_PTR(-ENOMEM); + + ovl_idmap_posix_acl(realinode, mnt_userns, clone); + return clone; +} + +/* * When the relevant layer is an idmapped mount we need to take the idmapping * of the layer into account and translate any ACL_{GROUP,USER} values * according to the idmapped mount. @@ -495,10 +555,12 @@ static void ovl_idmap_posix_acl(struct inode *realinode, * * This is obviously only relevant when idmapped layers are used. */ -struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu) +struct posix_acl *do_ovl_get_acl(struct user_namespace *mnt_userns, + struct inode *inode, int type, + bool rcu, bool noperm) { struct inode *realinode = ovl_inode_real(inode); - struct posix_acl *acl, *clone; + struct posix_acl *acl; struct path realpath; if (!IS_POSIXACL(realinode)) @@ -512,40 +574,115 @@ struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu) } if (rcu) { + /* + * If the layer is idmapped drop out of RCU path walk + * so we can clone the ACLs. + */ + if (is_idmapped_mnt(realpath.mnt)) + return ERR_PTR(-ECHILD); + acl = get_cached_acl_rcu(realinode, type); } else { const struct cred *old_cred; old_cred = ovl_override_creds(inode->i_sb); - acl = get_acl(realinode, type); + acl = ovl_get_acl_path(&realpath, posix_acl_xattr_name(type), noperm); revert_creds(old_cred); } - /* - * If there are no POSIX ACLs, or we encountered an error, - * or the layer isn't idmapped we don't need to do anything. - */ - if (!is_idmapped_mnt(realpath.mnt) || IS_ERR_OR_NULL(acl)) - return acl; + + return acl; +} + +static int ovl_set_or_remove_acl(struct dentry *dentry, struct inode *inode, + struct posix_acl *acl, int type) +{ + int err; + struct path realpath; + const char *acl_name; + const struct cred *old_cred; + struct ovl_fs *ofs = OVL_FS(dentry->d_sb); + struct dentry *upperdentry = ovl_dentry_upper(dentry); + struct dentry *realdentry = upperdentry ?: ovl_dentry_lower(dentry); + + err = ovl_want_write(dentry); + if (err) + return err; /* - * We only get here if the layer is idmapped. So drop out of RCU path - * walk so we can clone the ACLs. There's no need to release the ACLs - * since get_cached_acl_rcu() doesn't take a reference on the ACLs. + * If ACL is to be removed from a lower file, check if it exists in + * the first place before copying it up. */ - if (rcu) - return ERR_PTR(-ECHILD); + acl_name = posix_acl_xattr_name(type); + if (!acl && !upperdentry) { + struct posix_acl *real_acl; - clone = posix_acl_clone(acl, GFP_KERNEL); - if (!clone) - clone = ERR_PTR(-ENOMEM); + ovl_path_lower(dentry, &realpath); + old_cred = ovl_override_creds(dentry->d_sb); + real_acl = vfs_get_acl(mnt_user_ns(realpath.mnt), realdentry, + acl_name); + revert_creds(old_cred); + if (IS_ERR(real_acl)) { + err = PTR_ERR(real_acl); + goto out_drop_write; + } + posix_acl_release(real_acl); + } + + if (!upperdentry) { + err = ovl_copy_up(dentry); + if (err) + goto out_drop_write; + + realdentry = ovl_dentry_upper(dentry); + } + + old_cred = ovl_override_creds(dentry->d_sb); + if (acl) + err = ovl_do_set_acl(ofs, realdentry, acl_name, acl); else - ovl_idmap_posix_acl(realinode, mnt_user_ns(realpath.mnt), clone); + err = ovl_do_remove_acl(ofs, realdentry, acl_name); + revert_creds(old_cred); + + /* copy c/mtime */ + ovl_copyattr(inode); + +out_drop_write: + ovl_drop_write(dentry); + return err; +} + +int ovl_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + struct posix_acl *acl, int type) +{ + int err; + struct inode *inode = d_inode(dentry); + struct dentry *workdir = ovl_workdir(dentry); + struct inode *realinode = ovl_inode_real(inode); + + if (!IS_POSIXACL(d_inode(workdir))) + return -EOPNOTSUPP; + if (!realinode->i_op->set_acl) + return -EOPNOTSUPP; + if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) + return acl ? -EACCES : 0; + if (!inode_owner_or_capable(&init_user_ns, inode)) + return -EPERM; + /* - * Since we're not in RCU path walk we always need to release the - * original ACLs. + * Check if sgid bit needs to be cleared (actual setacl operation will + * be done with mounter's capabilities and so that won't do it for us). */ - posix_acl_release(acl); - return clone; + if (unlikely(inode->i_mode & S_ISGID) && type == ACL_TYPE_ACCESS && + !in_group_p(inode->i_gid) && + !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) { + struct iattr iattr = { .ia_valid = ATTR_KILL_SGID }; + + err = ovl_setattr(&init_user_ns, dentry, &iattr); + if (err) + return err; + } + + return ovl_set_or_remove_acl(dentry, inode, acl, type); } #endif @@ -721,7 +858,9 @@ static const struct inode_operations ovl_file_inode_operations = { .permission = ovl_permission, .getattr = ovl_getattr, .listxattr = ovl_listxattr, + .get_inode_acl = ovl_get_inode_acl, .get_acl = ovl_get_acl, + .set_acl = ovl_set_acl, .update_time = ovl_update_time, .fiemap = ovl_fiemap, .fileattr_get = ovl_fileattr_get, @@ -741,7 +880,9 @@ static const struct inode_operations ovl_special_inode_operations = { .permission = ovl_permission, .getattr = ovl_getattr, .listxattr = ovl_listxattr, + .get_inode_acl = ovl_get_inode_acl, .get_acl = ovl_get_acl, + .set_acl = ovl_set_acl, .update_time = ovl_update_time, }; diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h index eee8f08d32b6..480e6aabef27 100644 --- a/fs/overlayfs/overlayfs.h +++ b/fs/overlayfs/overlayfs.h @@ -8,6 +8,8 @@ #include <linux/uuid.h> #include <linux/fs.h> #include <linux/namei.h> +#include <linux/posix_acl.h> +#include <linux/posix_acl_xattr.h> #include "ovl_entry.h" #undef pr_fmt @@ -278,6 +280,18 @@ static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry, return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox)); } +static inline int ovl_do_set_acl(struct ovl_fs *ofs, struct dentry *dentry, + const char *acl_name, struct posix_acl *acl) +{ + return vfs_set_acl(ovl_upper_mnt_userns(ofs), dentry, acl_name, acl); +} + +static inline int ovl_do_remove_acl(struct ovl_fs *ofs, struct dentry *dentry, + const char *acl_name) +{ + return vfs_remove_acl(ovl_upper_mnt_userns(ofs), dentry, acl_name); +} + static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir, struct dentry *olddentry, struct inode *newdir, struct dentry *newdentry, unsigned int flags) @@ -594,9 +608,33 @@ int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name, ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); #ifdef CONFIG_FS_POSIX_ACL -struct posix_acl *ovl_get_acl(struct inode *inode, int type, bool rcu); +struct posix_acl *do_ovl_get_acl(struct user_namespace *mnt_userns, + struct inode *inode, int type, + bool rcu, bool noperm); +static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type, + bool rcu) +{ + return do_ovl_get_acl(&init_user_ns, inode, type, rcu, true); +} +static inline struct posix_acl *ovl_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, int type) +{ + return do_ovl_get_acl(mnt_userns, d_inode(dentry), type, false, false); +} +int ovl_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + struct posix_acl *acl, int type); +struct posix_acl *ovl_get_acl_path(const struct path *path, + const char *acl_name, bool noperm); #else -#define ovl_get_acl NULL +#define ovl_get_inode_acl NULL +#define ovl_get_acl NULL +#define ovl_set_acl NULL +static inline struct posix_acl *ovl_get_acl_path(const struct path *path, + const char *acl_name, + bool noperm) +{ + return NULL; +} #endif int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags); diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index a29a8afe9b26..2addafe4e14a 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -813,13 +813,11 @@ retry: * allowed as upper are limited to "normal" ones, where checking * for the above two errors is sufficient. */ - err = ovl_do_removexattr(ofs, work, - XATTR_NAME_POSIX_ACL_DEFAULT); + err = ovl_do_remove_acl(ofs, work, XATTR_NAME_POSIX_ACL_DEFAULT); if (err && err != -ENODATA && err != -EOPNOTSUPP) goto out_dput; - err = ovl_do_removexattr(ofs, work, - XATTR_NAME_POSIX_ACL_ACCESS); + err = ovl_do_remove_acl(ofs, work, XATTR_NAME_POSIX_ACL_ACCESS); if (err && err != -ENODATA && err != -EOPNOTSUPP) goto out_dput; @@ -1001,83 +999,6 @@ static unsigned int ovl_split_lowerdirs(char *str) return ctr; } -static int __maybe_unused -ovl_posix_acl_xattr_get(const struct xattr_handler *handler, - struct dentry *dentry, struct inode *inode, - const char *name, void *buffer, size_t size) -{ - return ovl_xattr_get(dentry, inode, handler->name, buffer, size); -} - -static int __maybe_unused -ovl_posix_acl_xattr_set(const struct xattr_handler *handler, - struct user_namespace *mnt_userns, - struct dentry *dentry, struct inode *inode, - const char *name, const void *value, - size_t size, int flags) -{ - struct dentry *workdir = ovl_workdir(dentry); - struct inode *realinode = ovl_inode_real(inode); - struct posix_acl *acl = NULL; - int err; - - /* Check that everything is OK before copy-up */ - if (value) { - /* The above comment can be understood in two ways: - * - * 1. We just want to check whether the basic POSIX ACL format - * is ok. For example, if the header is correct and the size - * is sane. - * 2. We want to know whether the ACL_{GROUP,USER} entries can - * be mapped according to the underlying filesystem. - * - * Currently, we only check 1. If we wanted to check 2. we - * would need to pass the mnt_userns and the fs_userns of the - * underlying filesystem. But frankly, I think checking 1. is - * enough to start the copy-up. - */ - acl = vfs_set_acl_prepare(&init_user_ns, &init_user_ns, value, size); - if (IS_ERR(acl)) - return PTR_ERR(acl); - } - err = -EOPNOTSUPP; - if (!IS_POSIXACL(d_inode(workdir))) - goto out_acl_release; - if (!realinode->i_op->set_acl) - goto out_acl_release; - if (handler->flags == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) { - err = acl ? -EACCES : 0; - goto out_acl_release; - } - err = -EPERM; - if (!inode_owner_or_capable(&init_user_ns, inode)) - goto out_acl_release; - - posix_acl_release(acl); - - /* - * Check if sgid bit needs to be cleared (actual setacl operation will - * be done with mounter's capabilities and so that won't do it for us). - */ - if (unlikely(inode->i_mode & S_ISGID) && - handler->flags == ACL_TYPE_ACCESS && - !in_group_p(inode->i_gid) && - !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) { - struct iattr iattr = { .ia_valid = ATTR_KILL_SGID }; - - err = ovl_setattr(&init_user_ns, dentry, &iattr); - if (err) - return err; - } - - err = ovl_xattr_set(dentry, inode, handler->name, value, size, flags); - return err; - -out_acl_release: - posix_acl_release(acl); - return err; -} - static int ovl_own_xattr_get(const struct xattr_handler *handler, struct dentry *dentry, struct inode *inode, const char *name, void *buffer, size_t size) @@ -1110,22 +1031,6 @@ static int ovl_other_xattr_set(const struct xattr_handler *handler, return ovl_xattr_set(dentry, inode, name, value, size, flags); } -static const struct xattr_handler __maybe_unused -ovl_posix_acl_access_xattr_handler = { - .name = XATTR_NAME_POSIX_ACL_ACCESS, - .flags = ACL_TYPE_ACCESS, - .get = ovl_posix_acl_xattr_get, - .set = ovl_posix_acl_xattr_set, -}; - -static const struct xattr_handler __maybe_unused -ovl_posix_acl_default_xattr_handler = { - .name = XATTR_NAME_POSIX_ACL_DEFAULT, - .flags = ACL_TYPE_DEFAULT, - .get = ovl_posix_acl_xattr_get, - .set = ovl_posix_acl_xattr_set, -}; - static const struct xattr_handler ovl_own_trusted_xattr_handler = { .prefix = OVL_XATTR_TRUSTED_PREFIX, .get = ovl_own_xattr_get, @@ -1146,8 +1051,8 @@ static const struct xattr_handler ovl_other_xattr_handler = { static const struct xattr_handler *ovl_trusted_xattr_handlers[] = { #ifdef CONFIG_FS_POSIX_ACL - &ovl_posix_acl_access_xattr_handler, - &ovl_posix_acl_default_xattr_handler, + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, #endif &ovl_own_trusted_xattr_handler, &ovl_other_xattr_handler, @@ -1156,8 +1061,8 @@ static const struct xattr_handler *ovl_trusted_xattr_handlers[] = { static const struct xattr_handler *ovl_user_xattr_handlers[] = { #ifdef CONFIG_FS_POSIX_ACL - &ovl_posix_acl_access_xattr_handler, - &ovl_posix_acl_default_xattr_handler, + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, #endif &ovl_own_user_xattr_handler, &ovl_other_xattr_handler, diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 74dc0f571dc9..e6643db35cce 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -25,6 +25,11 @@ #include <linux/namei.h> #include <linux/mnt_idmapping.h> #include <linux/iversion.h> +#include <linux/security.h> +#include <linux/evm.h> +#include <linux/fsnotify.h> + +#include "internal.h" static struct posix_acl **acl_by_type(struct inode *inode, int type) { @@ -64,7 +69,7 @@ struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type) if (acl == ACL_DONT_CACHE) { struct posix_acl *ret; - ret = inode->i_op->get_acl(inode, type, LOOKUP_RCU); + ret = inode->i_op->get_inode_acl(inode, type, LOOKUP_RCU); if (!IS_ERR(ret)) acl = ret; } @@ -106,15 +111,17 @@ void forget_all_cached_acls(struct inode *inode) } EXPORT_SYMBOL(forget_all_cached_acls); -struct posix_acl *get_acl(struct inode *inode, int type) +static struct posix_acl *__get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, struct inode *inode, + int type) { - void *sentinel; + struct posix_acl *sentinel; struct posix_acl **p; struct posix_acl *acl; /* * The sentinel is used to detect when another operation like - * set_cached_acl() or forget_cached_acl() races with get_acl(). + * set_cached_acl() or forget_cached_acl() races with get_inode_acl(). * It is guaranteed that is_uncached_acl(sentinel) is true. */ @@ -133,25 +140,27 @@ struct posix_acl *get_acl(struct inode *inode, int type) * current value of the ACL will not be ACL_NOT_CACHED and so our own * sentinel will not be set; another task will update the cache. We * could wait for that other task to complete its job, but it's easier - * to just call ->get_acl to fetch the ACL ourself. (This is going to - * be an unlikely race.) + * to just call ->get_inode_acl to fetch the ACL ourself. (This is + * going to be an unlikely race.) */ cmpxchg(p, ACL_NOT_CACHED, sentinel); /* - * Normally, the ACL returned by ->get_acl will be cached. + * Normally, the ACL returned by ->get{_inode}_acl will be cached. * A filesystem can prevent that by calling - * forget_cached_acl(inode, type) in ->get_acl. + * forget_cached_acl(inode, type) in ->get{_inode}_acl. * - * If the filesystem doesn't have a get_acl() function at all, we'll - * just create the negative cache entry. + * If the filesystem doesn't have a get{_inode}_ acl() function at all, + * we'll just create the negative cache entry. */ - if (!inode->i_op->get_acl) { + if (dentry && inode->i_op->get_acl) { + acl = inode->i_op->get_acl(mnt_userns, dentry, type); + } else if (inode->i_op->get_inode_acl) { + acl = inode->i_op->get_inode_acl(inode, type, false); + } else { set_cached_acl(inode, type, NULL); return NULL; } - acl = inode->i_op->get_acl(inode, type, false); - if (IS_ERR(acl)) { /* * Remove our sentinel so that we don't block future attempts @@ -169,7 +178,12 @@ struct posix_acl *get_acl(struct inode *inode, int type) posix_acl_release(acl); return acl; } -EXPORT_SYMBOL(get_acl); + +struct posix_acl *get_inode_acl(struct inode *inode, int type) +{ + return __get_acl(&init_user_ns, NULL, inode, type); +} +EXPORT_SYMBOL(get_inode_acl); /* * Init a fresh posix_acl @@ -578,19 +592,20 @@ EXPORT_SYMBOL(__posix_acl_chmod); * posix_acl_chmod - chmod a posix acl * * @mnt_userns: user namespace of the mount @inode was found from - * @inode: inode to check permissions on + * @dentry: dentry to check permissions on * @mode: the new mode of @inode * - * If the inode has been found through an idmapped mount the user namespace of + * If the dentry has been found through an idmapped mount the user namespace of * the vfsmount must be passed through @mnt_userns. This function will then * take care to map the inode according to @mnt_userns before checking * permissions. On non-idmapped mounts or if permission checking is to be * performed on the raw inode simply passs init_user_ns. */ int - posix_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode, + posix_acl_chmod(struct user_namespace *mnt_userns, struct dentry *dentry, umode_t mode) { + struct inode *inode = d_inode(dentry); struct posix_acl *acl; int ret = 0; @@ -599,7 +614,7 @@ int if (!inode->i_op->set_acl) return -EOPNOTSUPP; - acl = get_acl(inode, ACL_TYPE_ACCESS); + acl = get_inode_acl(inode, ACL_TYPE_ACCESS); if (IS_ERR_OR_NULL(acl)) { if (acl == ERR_PTR(-EOPNOTSUPP)) return 0; @@ -609,7 +624,7 @@ int ret = __posix_acl_chmod(&acl, GFP_KERNEL, mode); if (ret) return ret; - ret = inode->i_op->set_acl(mnt_userns, inode, acl, ACL_TYPE_ACCESS); + ret = inode->i_op->set_acl(mnt_userns, dentry, acl, ACL_TYPE_ACCESS); posix_acl_release(acl); return ret; } @@ -629,7 +644,7 @@ posix_acl_create(struct inode *dir, umode_t *mode, if (S_ISLNK(*mode) || !IS_POSIXACL(dir)) return 0; - p = get_acl(dir, ACL_TYPE_DEFAULT); + p = get_inode_acl(dir, ACL_TYPE_DEFAULT); if (!p || p == ERR_PTR(-EOPNOTSUPP)) { *mode &= ~current_umask(); return 0; @@ -732,118 +747,32 @@ static int posix_acl_fix_xattr_common(const void *value, size_t size) return count; } -void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns, - const struct inode *inode, - void *value, size_t size) -{ - struct posix_acl_xattr_header *header = value; - struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end; - struct user_namespace *fs_userns = i_user_ns(inode); - int count; - vfsuid_t vfsuid; - vfsgid_t vfsgid; - kuid_t uid; - kgid_t gid; - - if (no_idmapping(mnt_userns, i_user_ns(inode))) - return; - - count = posix_acl_fix_xattr_common(value, size); - if (count <= 0) - return; - - for (end = entry + count; entry != end; entry++) { - switch (le16_to_cpu(entry->e_tag)) { - case ACL_USER: - uid = make_kuid(&init_user_ns, le32_to_cpu(entry->e_id)); - vfsuid = make_vfsuid(mnt_userns, fs_userns, uid); - entry->e_id = cpu_to_le32(from_kuid(&init_user_ns, - vfsuid_into_kuid(vfsuid))); - break; - case ACL_GROUP: - gid = make_kgid(&init_user_ns, le32_to_cpu(entry->e_id)); - vfsgid = make_vfsgid(mnt_userns, fs_userns, gid); - entry->e_id = cpu_to_le32(from_kgid(&init_user_ns, - vfsgid_into_kgid(vfsgid))); - break; - default: - break; - } - } -} - -static void posix_acl_fix_xattr_userns( - struct user_namespace *to, struct user_namespace *from, - void *value, size_t size) -{ - struct posix_acl_xattr_header *header = value; - struct posix_acl_xattr_entry *entry = (void *)(header + 1), *end; - int count; - kuid_t uid; - kgid_t gid; - - count = posix_acl_fix_xattr_common(value, size); - if (count <= 0) - return; - - for (end = entry + count; entry != end; entry++) { - switch(le16_to_cpu(entry->e_tag)) { - case ACL_USER: - uid = make_kuid(from, le32_to_cpu(entry->e_id)); - entry->e_id = cpu_to_le32(from_kuid(to, uid)); - break; - case ACL_GROUP: - gid = make_kgid(from, le32_to_cpu(entry->e_id)); - entry->e_id = cpu_to_le32(from_kgid(to, gid)); - break; - default: - break; - } - } -} - -void posix_acl_fix_xattr_from_user(void *value, size_t size) -{ - struct user_namespace *user_ns = current_user_ns(); - if (user_ns == &init_user_ns) - return; - posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size); -} - -void posix_acl_fix_xattr_to_user(void *value, size_t size) -{ - struct user_namespace *user_ns = current_user_ns(); - if (user_ns == &init_user_ns) - return; - posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size); -} - /** - * make_posix_acl - convert POSIX ACLs from uapi to VFS format using the - * provided callbacks to map ACL_{GROUP,USER} entries into the - * appropriate format - * @mnt_userns: the mount's idmapping - * @fs_userns: the filesystem's idmapping + * posix_acl_from_xattr - convert POSIX ACLs from backing store to VFS format + * @userns: the filesystem's idmapping * @value: the uapi representation of POSIX ACLs * @size: the size of @void - * @uid_cb: callback to use for mapping the uid stored in ACL_USER entries - * @gid_cb: callback to use for mapping the gid stored in ACL_GROUP entries * - * The make_posix_acl() helper is an abstraction to translate from uapi format - * into the VFS format allowing the caller to specific callbacks to map - * ACL_{GROUP,USER} entries into the expected format. This is used in - * posix_acl_from_xattr() and vfs_set_acl_prepare() and avoids pointless code - * duplication. + * Filesystems that store POSIX ACLs in the unaltered uapi format should use + * posix_acl_from_xattr() when reading them from the backing store and + * converting them into the struct posix_acl VFS format. The helper is + * specifically intended to be called from the acl inode operation. + * + * The posix_acl_from_xattr() function will map the raw {g,u}id values stored + * in ACL_{GROUP,USER} entries into idmapping in @userns. + * + * Note that posix_acl_from_xattr() does not take idmapped mounts into account. + * If it did it calling it from the get acl inode operation would return POSIX + * ACLs mapped according to an idmapped mount which would mean that the value + * couldn't be cached for the filesystem. Idmapped mounts are taken into + * account on the fly during permission checking or right at the VFS - + * userspace boundary before reporting them to the user. * * Return: Allocated struct posix_acl on success, NULL for a valid header but * without actual POSIX ACL entries, or ERR_PTR() encoded error code. */ -static struct posix_acl *make_posix_acl(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, const void *value, size_t size, - kuid_t (*uid_cb)(struct user_namespace *, struct user_namespace *, - const struct posix_acl_xattr_entry *), - kgid_t (*gid_cb)(struct user_namespace *, struct user_namespace *, - const struct posix_acl_xattr_entry *)) +struct posix_acl *posix_acl_from_xattr(struct user_namespace *userns, + const void *value, size_t size) { const struct posix_acl_xattr_header *header = value; const struct posix_acl_xattr_entry *entry = (const void *)(header + 1), *end; @@ -874,12 +803,14 @@ static struct posix_acl *make_posix_acl(struct user_namespace *mnt_userns, break; case ACL_USER: - acl_e->e_uid = uid_cb(mnt_userns, fs_userns, entry); + acl_e->e_uid = make_kuid(userns, + le32_to_cpu(entry->e_id)); if (!uid_valid(acl_e->e_uid)) goto fail; break; case ACL_GROUP: - acl_e->e_gid = gid_cb(mnt_userns, fs_userns, entry); + acl_e->e_gid = make_kgid(userns, + le32_to_cpu(entry->e_id)); if (!gid_valid(acl_e->e_gid)) goto fail; break; @@ -894,181 +825,6 @@ fail: posix_acl_release(acl); return ERR_PTR(-EINVAL); } - -/** - * vfs_set_acl_prepare_kuid - map ACL_USER uid according to mount- and - * filesystem idmapping - * @mnt_userns: the mount's idmapping - * @fs_userns: the filesystem's idmapping - * @e: a ACL_USER entry in POSIX ACL uapi format - * - * The uid stored as ACL_USER entry in @e is a kuid_t stored as a raw {g,u}id - * value. The vfs_set_acl_prepare_kuid() will recover the kuid_t through - * KUIDT_INIT() and then map it according to the idmapped mount. The resulting - * kuid_t is the value which the filesystem can map up into a raw backing store - * id in the filesystem's idmapping. - * - * This is used in vfs_set_acl_prepare() to generate the proper VFS - * representation of POSIX ACLs with ACL_USER entries during setxattr(). - * - * Return: A kuid in @fs_userns for the uid stored in @e. - */ -static inline kuid_t -vfs_set_acl_prepare_kuid(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const struct posix_acl_xattr_entry *e) -{ - kuid_t kuid = KUIDT_INIT(le32_to_cpu(e->e_id)); - return from_vfsuid(mnt_userns, fs_userns, VFSUIDT_INIT(kuid)); -} - -/** - * vfs_set_acl_prepare_kgid - map ACL_GROUP gid according to mount- and - * filesystem idmapping - * @mnt_userns: the mount's idmapping - * @fs_userns: the filesystem's idmapping - * @e: a ACL_GROUP entry in POSIX ACL uapi format - * - * The gid stored as ACL_GROUP entry in @e is a kgid_t stored as a raw {g,u}id - * value. The vfs_set_acl_prepare_kgid() will recover the kgid_t through - * KGIDT_INIT() and then map it according to the idmapped mount. The resulting - * kgid_t is the value which the filesystem can map up into a raw backing store - * id in the filesystem's idmapping. - * - * This is used in vfs_set_acl_prepare() to generate the proper VFS - * representation of POSIX ACLs with ACL_GROUP entries during setxattr(). - * - * Return: A kgid in @fs_userns for the gid stored in @e. - */ -static inline kgid_t -vfs_set_acl_prepare_kgid(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const struct posix_acl_xattr_entry *e) -{ - kgid_t kgid = KGIDT_INIT(le32_to_cpu(e->e_id)); - return from_vfsgid(mnt_userns, fs_userns, VFSGIDT_INIT(kgid)); -} - -/** - * vfs_set_acl_prepare - convert POSIX ACLs from uapi to VFS format taking - * mount and filesystem idmappings into account - * @mnt_userns: the mount's idmapping - * @fs_userns: the filesystem's idmapping - * @value: the uapi representation of POSIX ACLs - * @size: the size of @void - * - * When setting POSIX ACLs with ACL_{GROUP,USER} entries they need to be - * mapped according to the relevant mount- and filesystem idmapping. It is - * important that the ACL_{GROUP,USER} entries in struct posix_acl will be - * mapped into k{g,u}id_t that are supposed to be mapped up in the filesystem - * idmapping. This is crucial since the resulting struct posix_acl might be - * cached filesystem wide. The vfs_set_acl_prepare() function will take care to - * perform all necessary idmappings. - * - * Note, that since basically forever the {g,u}id values encoded as - * ACL_{GROUP,USER} entries in the uapi POSIX ACLs passed via @value contain - * values that have been mapped according to the caller's idmapping. In other - * words, POSIX ACLs passed in uapi format as @value during setxattr() contain - * {g,u}id values in their ACL_{GROUP,USER} entries that should actually have - * been stored as k{g,u}id_t. - * - * This means, vfs_set_acl_prepare() needs to first recover the k{g,u}id_t by - * calling K{G,U}IDT_INIT(). Afterwards they can be interpreted as vfs{g,u}id_t - * through from_vfs{g,u}id() to account for any idmapped mounts. The - * vfs_set_acl_prepare_k{g,u}id() helpers will take care to generate the - * correct k{g,u}id_t. - * - * The filesystem will then receive the POSIX ACLs ready to be cached - * filesystem wide and ready to be written to the backing store taking the - * filesystem's idmapping into account. - * - * Return: Allocated struct posix_acl on success, NULL for a valid header but - * without actual POSIX ACL entries, or ERR_PTR() encoded error code. - */ -struct posix_acl *vfs_set_acl_prepare(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const void *value, size_t size) -{ - return make_posix_acl(mnt_userns, fs_userns, value, size, - vfs_set_acl_prepare_kuid, - vfs_set_acl_prepare_kgid); -} -EXPORT_SYMBOL(vfs_set_acl_prepare); - -/** - * posix_acl_from_xattr_kuid - map ACL_USER uid into filesystem idmapping - * @mnt_userns: unused - * @fs_userns: the filesystem's idmapping - * @e: a ACL_USER entry in POSIX ACL uapi format - * - * Map the uid stored as ACL_USER entry in @e into the filesystem's idmapping. - * This is used in posix_acl_from_xattr() to generate the proper VFS - * representation of POSIX ACLs with ACL_USER entries. - * - * Return: A kuid in @fs_userns for the uid stored in @e. - */ -static inline kuid_t -posix_acl_from_xattr_kuid(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const struct posix_acl_xattr_entry *e) -{ - return make_kuid(fs_userns, le32_to_cpu(e->e_id)); -} - -/** - * posix_acl_from_xattr_kgid - map ACL_GROUP gid into filesystem idmapping - * @mnt_userns: unused - * @fs_userns: the filesystem's idmapping - * @e: a ACL_GROUP entry in POSIX ACL uapi format - * - * Map the gid stored as ACL_GROUP entry in @e into the filesystem's idmapping. - * This is used in posix_acl_from_xattr() to generate the proper VFS - * representation of POSIX ACLs with ACL_GROUP entries. - * - * Return: A kgid in @fs_userns for the gid stored in @e. - */ -static inline kgid_t -posix_acl_from_xattr_kgid(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const struct posix_acl_xattr_entry *e) -{ - return make_kgid(fs_userns, le32_to_cpu(e->e_id)); -} - -/** - * posix_acl_from_xattr - convert POSIX ACLs from backing store to VFS format - * @fs_userns: the filesystem's idmapping - * @value: the uapi representation of POSIX ACLs - * @size: the size of @void - * - * Filesystems that store POSIX ACLs in the unaltered uapi format should use - * posix_acl_from_xattr() when reading them from the backing store and - * converting them into the struct posix_acl VFS format. The helper is - * specifically intended to be called from the ->get_acl() inode operation. - * - * The posix_acl_from_xattr() function will map the raw {g,u}id values stored - * in ACL_{GROUP,USER} entries into the filesystem idmapping in @fs_userns. The - * posix_acl_from_xattr_k{g,u}id() helpers will take care to generate the - * correct k{g,u}id_t. The returned struct posix_acl can be cached. - * - * Note that posix_acl_from_xattr() does not take idmapped mounts into account. - * If it did it calling is from the ->get_acl() inode operation would return - * POSIX ACLs mapped according to an idmapped mount which would mean that the - * value couldn't be cached for the filesystem. Idmapped mounts are taken into - * account on the fly during permission checking or right at the VFS - - * userspace boundary before reporting them to the user. - * - * Return: Allocated struct posix_acl on success, NULL for a valid header but - * without actual POSIX ACL entries, or ERR_PTR() encoded error code. - */ -struct posix_acl * -posix_acl_from_xattr(struct user_namespace *fs_userns, - const void *value, size_t size) -{ - return make_posix_acl(&init_user_ns, fs_userns, value, size, - posix_acl_from_xattr_kuid, - posix_acl_from_xattr_kgid); -} EXPORT_SYMBOL (posix_acl_from_xattr); /* @@ -1113,35 +869,74 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, } EXPORT_SYMBOL (posix_acl_to_xattr); -static int -posix_acl_xattr_get(const struct xattr_handler *handler, - struct dentry *unused, struct inode *inode, - const char *name, void *value, size_t size) -{ - struct posix_acl *acl; - int error; +/** + * vfs_posix_acl_to_xattr - convert from kernel to userspace representation + * @mnt_userns: user namespace of the mount + * @inode: inode the posix acls are set on + * @acl: the posix acls as represented by the vfs + * @buffer: the buffer into which to convert @acl + * @size: size of @buffer + * + * This converts @acl from the VFS representation in the filesystem idmapping + * to the uapi form reportable to userspace. And mount and caller idmappings + * are handled appropriately. + * + * Return: On success, the size of the stored uapi posix acls, on error a + * negative errno. + */ +static ssize_t vfs_posix_acl_to_xattr(struct user_namespace *mnt_userns, + struct inode *inode, + const struct posix_acl *acl, void *buffer, + size_t size) - if (!IS_POSIXACL(inode)) - return -EOPNOTSUPP; - if (S_ISLNK(inode->i_mode)) - return -EOPNOTSUPP; +{ + struct posix_acl_xattr_header *ext_acl = buffer; + struct posix_acl_xattr_entry *ext_entry; + struct user_namespace *fs_userns, *caller_userns; + ssize_t real_size, n; + vfsuid_t vfsuid; + vfsgid_t vfsgid; - acl = get_acl(inode, handler->flags); - if (IS_ERR(acl)) - return PTR_ERR(acl); - if (acl == NULL) - return -ENODATA; + real_size = posix_acl_xattr_size(acl->a_count); + if (!buffer) + return real_size; + if (real_size > size) + return -ERANGE; - error = posix_acl_to_xattr(&init_user_ns, acl, value, size); - posix_acl_release(acl); + ext_entry = (void *)(ext_acl + 1); + ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION); - return error; + fs_userns = i_user_ns(inode); + caller_userns = current_user_ns(); + for (n=0; n < acl->a_count; n++, ext_entry++) { + const struct posix_acl_entry *acl_e = &acl->a_entries[n]; + ext_entry->e_tag = cpu_to_le16(acl_e->e_tag); + ext_entry->e_perm = cpu_to_le16(acl_e->e_perm); + switch(acl_e->e_tag) { + case ACL_USER: + vfsuid = make_vfsuid(mnt_userns, fs_userns, acl_e->e_uid); + ext_entry->e_id = cpu_to_le32(from_kuid( + caller_userns, vfsuid_into_kuid(vfsuid))); + break; + case ACL_GROUP: + vfsgid = make_vfsgid(mnt_userns, fs_userns, acl_e->e_gid); + ext_entry->e_id = cpu_to_le32(from_kgid( + caller_userns, vfsgid_into_kgid(vfsgid))); + break; + default: + ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); + break; + } + } + return real_size; } int -set_posix_acl(struct user_namespace *mnt_userns, struct inode *inode, +set_posix_acl(struct user_namespace *mnt_userns, struct dentry *dentry, int type, struct posix_acl *acl) { + struct inode *inode = d_inode(dentry); + if (!IS_POSIXACL(inode)) return -EOPNOTSUPP; if (!inode->i_op->set_acl) @@ -1157,40 +952,10 @@ set_posix_acl(struct user_namespace *mnt_userns, struct inode *inode, if (ret) return ret; } - return inode->i_op->set_acl(mnt_userns, inode, acl, type); + return inode->i_op->set_acl(mnt_userns, dentry, acl, type); } EXPORT_SYMBOL(set_posix_acl); -static int -posix_acl_xattr_set(const struct xattr_handler *handler, - struct user_namespace *mnt_userns, - struct dentry *unused, struct inode *inode, - const char *name, const void *value, size_t size, - int flags) -{ - struct posix_acl *acl = NULL; - int ret; - - if (value) { - /* - * By the time we end up here the {g,u}ids stored in - * ACL_{GROUP,USER} have already been mapped according to the - * caller's idmapping. The vfs_set_acl_prepare() helper will - * recover them and take idmapped mounts into account. The - * filesystem will receive the POSIX ACLs in the correct - * format ready to be cached or written to the backing store - * taking the filesystem idmapping into account. - */ - acl = vfs_set_acl_prepare(mnt_userns, i_user_ns(inode), - value, size); - if (IS_ERR(acl)) - return PTR_ERR(acl); - } - ret = set_posix_acl(mnt_userns, inode, handler->flags, acl); - posix_acl_release(acl); - return ret; -} - static bool posix_acl_xattr_list(struct dentry *dentry) { @@ -1201,8 +966,6 @@ const struct xattr_handler posix_acl_access_xattr_handler = { .name = XATTR_NAME_POSIX_ACL_ACCESS, .flags = ACL_TYPE_ACCESS, .list = posix_acl_xattr_list, - .get = posix_acl_xattr_get, - .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_access_xattr_handler); @@ -1210,15 +973,14 @@ const struct xattr_handler posix_acl_default_xattr_handler = { .name = XATTR_NAME_POSIX_ACL_DEFAULT, .flags = ACL_TYPE_DEFAULT, .list = posix_acl_xattr_list, - .get = posix_acl_xattr_get, - .set = posix_acl_xattr_set, }; EXPORT_SYMBOL_GPL(posix_acl_default_xattr_handler); -int simple_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int simple_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int error; + struct inode *inode = d_inode(dentry); if (type == ACL_TYPE_ACCESS) { error = posix_acl_update_mode(mnt_userns, inode, @@ -1252,3 +1014,252 @@ int simple_acl_create(struct inode *dir, struct inode *inode) posix_acl_release(acl); return 0; } + +static int vfs_set_acl_idmapped_mnt(struct user_namespace *mnt_userns, + struct user_namespace *fs_userns, + struct posix_acl *acl) +{ + for (int n = 0; n < acl->a_count; n++) { + struct posix_acl_entry *acl_e = &acl->a_entries[n]; + + switch (acl_e->e_tag) { + case ACL_USER: + acl_e->e_uid = from_vfsuid(mnt_userns, fs_userns, + VFSUIDT_INIT(acl_e->e_uid)); + break; + case ACL_GROUP: + acl_e->e_gid = from_vfsgid(mnt_userns, fs_userns, + VFSGIDT_INIT(acl_e->e_gid)); + break; + } + } + + return 0; +} + +/** + * vfs_set_acl - set posix acls + * @mnt_userns: user namespace of the mount + * @dentry: the dentry based on which to set the posix acls + * @acl_name: the name of the posix acl + * @kacl: the posix acls in the appropriate VFS format + * + * This function sets @kacl. The caller must all posix_acl_release() on @kacl + * afterwards. + * + * Return: On success 0, on error negative errno. + */ +int vfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, struct posix_acl *kacl) +{ + int acl_type; + int error; + struct inode *inode = d_inode(dentry); + struct inode *delegated_inode = NULL; + + acl_type = posix_acl_type(acl_name); + if (acl_type < 0) + return -EINVAL; + + if (kacl) { + /* + * If we're on an idmapped mount translate from mount specific + * vfs{g,u}id_t into global filesystem k{g,u}id_t. + * Afterwards we can cache the POSIX ACLs filesystem wide and - + * if this is a filesystem with a backing store - ultimately + * translate them to backing store values. + */ + error = vfs_set_acl_idmapped_mnt(mnt_userns, i_user_ns(inode), kacl); + if (error) + return error; + } + +retry_deleg: + inode_lock(inode); + + /* + * We only care about restrictions the inode struct itself places upon + * us otherwise POSIX ACLs aren't subject to any VFS restrictions. + */ + error = may_write_xattr(mnt_userns, inode); + if (error) + goto out_inode_unlock; + + error = security_inode_set_acl(mnt_userns, dentry, acl_name, kacl); + if (error) + goto out_inode_unlock; + + error = try_break_deleg(inode, &delegated_inode); + if (error) + goto out_inode_unlock; + + if (inode->i_opflags & IOP_XATTR) + error = set_posix_acl(mnt_userns, dentry, acl_type, kacl); + else if (unlikely(is_bad_inode(inode))) + error = -EIO; + else + error = -EOPNOTSUPP; + if (!error) { + fsnotify_xattr(dentry); + evm_inode_post_set_acl(dentry, acl_name, kacl); + } + +out_inode_unlock: + inode_unlock(inode); + + if (delegated_inode) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry_deleg; + } + + return error; +} +EXPORT_SYMBOL_GPL(vfs_set_acl); + +/** + * vfs_get_acl - get posix acls + * @mnt_userns: user namespace of the mount + * @dentry: the dentry based on which to retrieve the posix acls + * @acl_name: the name of the posix acl + * + * This function retrieves @kacl from the filesystem. The caller must all + * posix_acl_release() on @kacl. + * + * Return: On success POSIX ACLs in VFS format, on error negative errno. + */ +struct posix_acl *vfs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + struct inode *inode = d_inode(dentry); + struct posix_acl *acl; + int acl_type, error; + + acl_type = posix_acl_type(acl_name); + if (acl_type < 0) + return ERR_PTR(-EINVAL); + + /* + * The VFS has no restrictions on reading POSIX ACLs so calling + * something like xattr_permission() isn't needed. Only LSMs get a say. + */ + error = security_inode_get_acl(mnt_userns, dentry, acl_name); + if (error) + return ERR_PTR(error); + + if (!IS_POSIXACL(inode)) + return ERR_PTR(-EOPNOTSUPP); + if (S_ISLNK(inode->i_mode)) + return ERR_PTR(-EOPNOTSUPP); + + acl = __get_acl(mnt_userns, dentry, inode, acl_type); + if (IS_ERR(acl)) + return acl; + if (!acl) + return ERR_PTR(-ENODATA); + + return acl; +} +EXPORT_SYMBOL_GPL(vfs_get_acl); + +/** + * vfs_remove_acl - remove posix acls + * @mnt_userns: user namespace of the mount + * @dentry: the dentry based on which to retrieve the posix acls + * @acl_name: the name of the posix acl + * + * This function removes posix acls. + * + * Return: On success 0, on error negative errno. + */ +int vfs_remove_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name) +{ + int acl_type; + int error; + struct inode *inode = d_inode(dentry); + struct inode *delegated_inode = NULL; + + acl_type = posix_acl_type(acl_name); + if (acl_type < 0) + return -EINVAL; + +retry_deleg: + inode_lock(inode); + + /* + * We only care about restrictions the inode struct itself places upon + * us otherwise POSIX ACLs aren't subject to any VFS restrictions. + */ + error = may_write_xattr(mnt_userns, inode); + if (error) + goto out_inode_unlock; + + error = security_inode_remove_acl(mnt_userns, dentry, acl_name); + if (error) + goto out_inode_unlock; + + error = try_break_deleg(inode, &delegated_inode); + if (error) + goto out_inode_unlock; + + if (inode->i_opflags & IOP_XATTR) + error = set_posix_acl(mnt_userns, dentry, acl_type, NULL); + else if (unlikely(is_bad_inode(inode))) + error = -EIO; + else + error = -EOPNOTSUPP; + if (!error) { + fsnotify_xattr(dentry); + evm_inode_post_remove_acl(mnt_userns, dentry, acl_name); + } + +out_inode_unlock: + inode_unlock(inode); + + if (delegated_inode) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry_deleg; + } + + return error; +} +EXPORT_SYMBOL_GPL(vfs_remove_acl); + +int do_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, const void *kvalue, size_t size) +{ + int error; + struct posix_acl *acl = NULL; + + if (size) { + /* + * Note that posix_acl_from_xattr() uses GFP_NOFS when it + * probably doesn't need to here. + */ + acl = posix_acl_from_xattr(current_user_ns(), kvalue, size); + if (IS_ERR(acl)) + return PTR_ERR(acl); + } + + error = vfs_set_acl(mnt_userns, dentry, acl_name, acl); + posix_acl_release(acl); + return error; +} + +ssize_t do_get_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, void *kvalue, size_t size) +{ + ssize_t error; + struct posix_acl *acl; + + acl = vfs_get_acl(mnt_userns, dentry, acl_name); + if (IS_ERR(acl)) + return PTR_ERR(acl); + + error = vfs_posix_acl_to_xattr(mnt_userns, d_inode(dentry), + acl, kvalue, size); + posix_acl_release(acl); + return error; +} diff --git a/fs/reiserfs/acl.h b/fs/reiserfs/acl.h index d9052b8ce6dd..29c503a06db4 100644 --- a/fs/reiserfs/acl.h +++ b/fs/reiserfs/acl.h @@ -49,9 +49,9 @@ static inline int reiserfs_acl_count(size_t size) #ifdef CONFIG_REISERFS_FS_POSIX_ACL struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, bool rcu); -int reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +int reiserfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); -int reiserfs_acl_chmod(struct inode *inode); +int reiserfs_acl_chmod(struct dentry *dentry); int reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th, struct inode *dir, struct dentry *dentry, struct inode *inode); @@ -63,7 +63,7 @@ int reiserfs_cache_default_acl(struct inode *dir); #define reiserfs_get_acl NULL #define reiserfs_set_acl NULL -static inline int reiserfs_acl_chmod(struct inode *inode) +static inline int reiserfs_acl_chmod(struct dentry *dentry) { return 0; } diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c index 6e228bfbe7ef..467d13da198f 100644 --- a/fs/reiserfs/file.c +++ b/fs/reiserfs/file.c @@ -256,7 +256,7 @@ const struct inode_operations reiserfs_file_inode_operations = { .setattr = reiserfs_setattr, .listxattr = reiserfs_listxattr, .permission = reiserfs_permission, - .get_acl = reiserfs_get_acl, + .get_inode_acl = reiserfs_get_acl, .set_acl = reiserfs_set_acl, .fileattr_get = reiserfs_fileattr_get, .fileattr_set = reiserfs_fileattr_set, diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c index b9580a6515ee..c7d1fa526dea 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -3404,7 +3404,7 @@ int reiserfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, if (!error && reiserfs_posixacl(inode->i_sb)) { if (attr->ia_valid & ATTR_MODE) - error = reiserfs_acl_chmod(inode); + error = reiserfs_acl_chmod(dentry); } out: diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c index 3d7a35d6a18b..4d428e8704bc 100644 --- a/fs/reiserfs/namei.c +++ b/fs/reiserfs/namei.c @@ -1659,7 +1659,7 @@ const struct inode_operations reiserfs_dir_inode_operations = { .setattr = reiserfs_setattr, .listxattr = reiserfs_listxattr, .permission = reiserfs_permission, - .get_acl = reiserfs_get_acl, + .get_inode_acl = reiserfs_get_acl, .set_acl = reiserfs_set_acl, .fileattr_get = reiserfs_fileattr_get, .fileattr_set = reiserfs_fileattr_set, @@ -1683,6 +1683,6 @@ const struct inode_operations reiserfs_special_inode_operations = { .setattr = reiserfs_setattr, .listxattr = reiserfs_listxattr, .permission = reiserfs_permission, - .get_acl = reiserfs_get_acl, + .get_inode_acl = reiserfs_get_acl, .set_acl = reiserfs_set_acl, }; diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c index d6fcddc46f5b..93fe414fed18 100644 --- a/fs/reiserfs/xattr_acl.c +++ b/fs/reiserfs/xattr_acl.c @@ -18,7 +18,7 @@ static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th, int -reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +reiserfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { int error, error2; @@ -26,6 +26,7 @@ reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, size_t jcreate_blocks; int size = acl ? posix_acl_xattr_size(acl->a_count) : 0; int update_mode = 0; + struct inode *inode = d_inode(dentry); umode_t mode = inode->i_mode; /* @@ -371,7 +372,7 @@ int reiserfs_cache_default_acl(struct inode *inode) if (IS_PRIVATE(inode)) return 0; - acl = get_acl(inode, ACL_TYPE_DEFAULT); + acl = get_inode_acl(inode, ACL_TYPE_DEFAULT); if (acl && !IS_ERR(acl)) { int size = reiserfs_acl_size(acl->a_count); @@ -396,13 +397,15 @@ int reiserfs_cache_default_acl(struct inode *inode) /* * Called under i_mutex */ -int reiserfs_acl_chmod(struct inode *inode) +int reiserfs_acl_chmod(struct dentry *dentry) { + struct inode *inode = d_inode(dentry); + if (IS_PRIVATE(inode)) return 0; if (get_inode_sd_version(inode) == STAT_DATA_V1 || !reiserfs_posixacl(inode->i_sb)) return 0; - return posix_acl_chmod(&init_user_ns, inode, inode->i_mode); + return posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); } diff --git a/fs/xattr.c b/fs/xattr.c index 61107b6bbed2..df3af9fa8c77 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -80,6 +80,31 @@ xattr_resolve_name(struct inode *inode, const char **name) return ERR_PTR(-EOPNOTSUPP); } +/** + * may_write_xattr - check whether inode allows writing xattr + * @mnt_userns: User namespace of the mount the inode was found from + * @inode: the inode on which to set an xattr + * + * Check whether the inode allows writing xattrs. Specifically, we can never + * set or remove an extended attribute on a read-only filesystem or on an + * immutable / append-only inode. + * + * We also need to ensure that the inode has a mapping in the mount to + * not risk writing back invalid i_{g,u}id values. + * + * Return: On success zero is returned. On error a negative errno is returned. + */ +int may_write_xattr(struct user_namespace *mnt_userns, struct inode *inode) +{ + if (IS_IMMUTABLE(inode)) + return -EPERM; + if (IS_APPEND(inode)) + return -EPERM; + if (HAS_UNMAPPED_ID(mnt_userns, inode)) + return -EPERM; + return 0; +} + /* * Check permissions for extended attribute access. This is a bit complicated * because different namespaces have very different rules. @@ -88,20 +113,12 @@ static int xattr_permission(struct user_namespace *mnt_userns, struct inode *inode, const char *name, int mask) { - /* - * We can never set or remove an extended attribute on a read-only - * filesystem or on an immutable / append-only inode. - */ if (mask & MAY_WRITE) { - if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) - return -EPERM; - /* - * Updating an xattr will likely cause i_uid and i_gid - * to be writen back improperly if their true value is - * unknown to the vfs. - */ - if (HAS_UNMAPPED_ID(mnt_userns, inode)) - return -EPERM; + int ret; + + ret = may_write_xattr(mnt_userns, inode); + if (ret) + return ret; } /* @@ -172,6 +189,9 @@ __vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry, { const struct xattr_handler *handler; + if (is_posix_acl_xattr(name)) + return -EOPNOTSUPP; + handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); @@ -282,12 +302,6 @@ out: } EXPORT_SYMBOL_GPL(__vfs_setxattr_locked); -static inline bool is_posix_acl_xattr(const char *name) -{ - return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || - (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0); -} - int vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry, const char *name, const void *value, size_t size, int flags) @@ -399,6 +413,9 @@ __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, { const struct xattr_handler *handler; + if (is_posix_acl_xattr(name)) + return -EOPNOTSUPP; + handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); @@ -437,10 +454,7 @@ vfs_getxattr(struct user_namespace *mnt_userns, struct dentry *dentry, return ret; } nolsm: - error = __vfs_getxattr(dentry, inode, name, value, size); - if (error > 0 && is_posix_acl_xattr(name)) - posix_acl_getxattr_idmapped_mnt(mnt_userns, inode, value, size); - return error; + return __vfs_getxattr(dentry, inode, name, value, size); } EXPORT_SYMBOL_GPL(vfs_getxattr); @@ -471,6 +485,9 @@ __vfs_removexattr(struct user_namespace *mnt_userns, struct dentry *dentry, struct inode *inode = d_inode(dentry); const struct xattr_handler *handler; + if (is_posix_acl_xattr(name)) + return -EOPNOTSUPP; + handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); @@ -580,17 +597,13 @@ int setxattr_copy(const char __user *name, struct xattr_ctx *ctx) return error; } -static void setxattr_convert(struct user_namespace *mnt_userns, - struct dentry *d, struct xattr_ctx *ctx) -{ - if (ctx->size && is_posix_acl_xattr(ctx->kname->name)) - posix_acl_fix_xattr_from_user(ctx->kvalue, ctx->size); -} - int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry, struct xattr_ctx *ctx) { - setxattr_convert(mnt_userns, dentry, ctx); + if (is_posix_acl_xattr(ctx->kname->name)) + return do_set_acl(mnt_userns, dentry, ctx->kname->name, + ctx->kvalue, ctx->size); + return vfs_setxattr(mnt_userns, dentry, ctx->kname->name, ctx->kvalue, ctx->size, ctx->flags); } @@ -697,10 +710,11 @@ do_getxattr(struct user_namespace *mnt_userns, struct dentry *d, return -ENOMEM; } - error = vfs_getxattr(mnt_userns, d, kname, ctx->kvalue, ctx->size); + if (is_posix_acl_xattr(ctx->kname->name)) + error = do_get_acl(mnt_userns, d, kname, ctx->kvalue, ctx->size); + else + error = vfs_getxattr(mnt_userns, d, kname, ctx->kvalue, ctx->size); if (error > 0) { - if (is_posix_acl_xattr(kname)) - posix_acl_fix_xattr_to_user(ctx->kvalue, error); if (ctx->size && copy_to_user(ctx->value, ctx->kvalue, error)) error = -EFAULT; } else if (error == -ERANGE && ctx->size >= XATTR_SIZE_MAX) { @@ -875,6 +889,9 @@ removexattr(struct user_namespace *mnt_userns, struct dentry *d, if (error < 0) return error; + if (is_posix_acl_xattr(kname)) + return vfs_remove_acl(mnt_userns, d, kname); + return vfs_removexattr(mnt_userns, d, kname); } diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c index b744c62052b6..a05f44eb8178 100644 --- a/fs/xfs/xfs_acl.c +++ b/fs/xfs/xfs_acl.c @@ -242,12 +242,13 @@ xfs_acl_set_mode( } int -xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +xfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type) { umode_t mode; bool set_mode = false; int error = 0; + struct inode *inode = d_inode(dentry); if (!acl) goto set_acl; diff --git a/fs/xfs/xfs_acl.h b/fs/xfs/xfs_acl.h index 263404d0bfda..dcd176149c7a 100644 --- a/fs/xfs/xfs_acl.h +++ b/fs/xfs/xfs_acl.h @@ -11,7 +11,7 @@ struct posix_acl; #ifdef CONFIG_XFS_POSIX_ACL extern struct posix_acl *xfs_get_acl(struct inode *inode, int type, bool rcu); -extern int xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, +extern int xfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, struct posix_acl *acl, int type); extern int __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); void xfs_forget_acl(struct inode *inode, const char *name); diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 2e10e1c66ad6..712238305bc3 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -651,6 +651,7 @@ xfs_vn_change_ok( static int xfs_setattr_nonsize( struct user_namespace *mnt_userns, + struct dentry *dentry, struct xfs_inode *ip, struct iattr *iattr) { @@ -757,7 +758,7 @@ xfs_setattr_nonsize( * Posix ACL code seems to care about this issue either. */ if (mask & ATTR_MODE) { - error = posix_acl_chmod(mnt_userns, inode, inode->i_mode); + error = posix_acl_chmod(mnt_userns, dentry, inode->i_mode); if (error) return error; } @@ -779,6 +780,7 @@ out_dqrele: STATIC int xfs_setattr_size( struct user_namespace *mnt_userns, + struct dentry *dentry, struct xfs_inode *ip, struct iattr *iattr) { @@ -810,7 +812,7 @@ xfs_setattr_size( * Use the regular setattr path to update the timestamps. */ iattr->ia_valid &= ~ATTR_SIZE; - return xfs_setattr_nonsize(mnt_userns, ip, iattr); + return xfs_setattr_nonsize(mnt_userns, dentry, ip, iattr); } /* @@ -987,7 +989,7 @@ xfs_vn_setattr_size( error = xfs_vn_change_ok(mnt_userns, dentry, iattr); if (error) return error; - return xfs_setattr_size(mnt_userns, ip, iattr); + return xfs_setattr_size(mnt_userns, dentry, ip, iattr); } STATIC int @@ -1019,7 +1021,7 @@ xfs_vn_setattr( error = xfs_vn_change_ok(mnt_userns, dentry, iattr); if (!error) - error = xfs_setattr_nonsize(mnt_userns, ip, iattr); + error = xfs_setattr_nonsize(mnt_userns, dentry, ip, iattr); } return error; @@ -1101,7 +1103,7 @@ xfs_vn_tmpfile( } static const struct inode_operations xfs_inode_operations = { - .get_acl = xfs_get_acl, + .get_inode_acl = xfs_get_acl, .set_acl = xfs_set_acl, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, @@ -1128,7 +1130,7 @@ static const struct inode_operations xfs_dir_inode_operations = { .rmdir = xfs_vn_unlink, .mknod = xfs_vn_mknod, .rename = xfs_vn_rename, - .get_acl = xfs_get_acl, + .get_inode_acl = xfs_get_acl, .set_acl = xfs_set_acl, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, @@ -1155,7 +1157,7 @@ static const struct inode_operations xfs_dir_ci_inode_operations = { .rmdir = xfs_vn_unlink, .mknod = xfs_vn_mknod, .rename = xfs_vn_rename, - .get_acl = xfs_get_acl, + .get_inode_acl = xfs_get_acl, .set_acl = xfs_set_acl, .getattr = xfs_vn_getattr, .setattr = xfs_vn_setattr, diff --git a/include/linux/evm.h b/include/linux/evm.h index aa63e0b3c0a2..7a9ee2157f69 100644 --- a/include/linux/evm.h +++ b/include/linux/evm.h @@ -35,6 +35,27 @@ extern int evm_inode_removexattr(struct user_namespace *mnt_userns, struct dentry *dentry, const char *xattr_name); extern void evm_inode_post_removexattr(struct dentry *dentry, const char *xattr_name); +static inline void evm_inode_post_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + evm_inode_post_removexattr(dentry, acl_name); +} +extern int evm_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl); +static inline int evm_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return evm_inode_set_acl(mnt_userns, dentry, acl_name, NULL); +} +static inline void evm_inode_post_set_acl(struct dentry *dentry, + const char *acl_name, + struct posix_acl *kacl) +{ + return evm_inode_post_setxattr(dentry, acl_name, NULL, 0); +} extern int evm_inode_init_security(struct inode *inode, const struct xattr *xattr_array, struct xattr *evm); @@ -108,6 +129,34 @@ static inline void evm_inode_post_removexattr(struct dentry *dentry, return; } +static inline void evm_inode_post_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return; +} + +static inline int evm_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + return 0; +} + +static inline int evm_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return 0; +} + +static inline void evm_inode_post_set_acl(struct dentry *dentry, + const char *acl_name, + struct posix_acl *kacl) +{ + return; +} + static inline int evm_inode_init_security(struct inode *inode, const struct xattr *xattr_array, struct xattr *evm) diff --git a/include/linux/fs.h b/include/linux/fs.h index 1e469b879787..d1347311010c 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -560,8 +560,8 @@ struct posix_acl; #define ACL_NOT_CACHED ((void *)(-1)) /* * ACL_DONT_CACHE is for stacked filesystems, that rely on underlying fs to - * cache the ACL. This also means that ->get_acl() can be called in RCU mode - * with the LOOKUP_RCU flag. + * cache the ACL. This also means that ->get_inode_acl() can be called in RCU + * mode with the LOOKUP_RCU flag. */ #define ACL_DONT_CACHE ((void *)(-3)) @@ -2169,7 +2169,7 @@ struct inode_operations { struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); const char * (*get_link) (struct dentry *, struct inode *, struct delayed_call *); int (*permission) (struct user_namespace *, struct inode *, int); - struct posix_acl * (*get_acl)(struct inode *, int, bool); + struct posix_acl * (*get_inode_acl)(struct inode *, int, bool); int (*readlink) (struct dentry *, char __user *,int); @@ -2199,7 +2199,9 @@ struct inode_operations { umode_t create_mode); int (*tmpfile) (struct user_namespace *, struct inode *, struct file *, umode_t); - int (*set_acl)(struct user_namespace *, struct inode *, + struct posix_acl *(*get_acl)(struct user_namespace *, struct dentry *, + int); + int (*set_acl)(struct user_namespace *, struct dentry *, struct posix_acl *, int); int (*fileattr_set)(struct user_namespace *mnt_userns, struct dentry *dentry, struct fileattr *fa); diff --git a/include/linux/ima.h b/include/linux/ima.h index 81708ca0ebc7..5a0b2a285a18 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -187,6 +187,15 @@ extern void ima_inode_post_setattr(struct user_namespace *mnt_userns, struct dentry *dentry); extern int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, const void *xattr_value, size_t xattr_value_len); +extern int ima_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl); +static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return ima_inode_set_acl(mnt_userns, dentry, acl_name, NULL); +} extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name); #else static inline bool is_ima_appraise_enabled(void) @@ -208,11 +217,26 @@ static inline int ima_inode_setxattr(struct dentry *dentry, return 0; } +static inline int ima_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + + return 0; +} + static inline int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) { return 0; } + +static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return 0; +} #endif /* CONFIG_IMA_APPRAISE */ #if defined(CONFIG_IMA_APPRAISE) && defined(CONFIG_INTEGRITY_TRUSTED_KEYRING) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index ec119da1d89b..7f4aaddce298 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -145,6 +145,12 @@ LSM_HOOK(int, 0, inode_getxattr, struct dentry *dentry, const char *name) LSM_HOOK(int, 0, inode_listxattr, struct dentry *dentry) LSM_HOOK(int, 0, inode_removexattr, struct user_namespace *mnt_userns, struct dentry *dentry, const char *name) +LSM_HOOK(int, 0, inode_set_acl, struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, struct posix_acl *kacl) +LSM_HOOK(int, 0, inode_get_acl, struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +LSM_HOOK(int, 0, inode_remove_acl, struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) LSM_HOOK(int, 0, inode_need_killpriv, struct dentry *dentry) LSM_HOOK(int, 0, inode_killpriv, struct user_namespace *mnt_userns, struct dentry *dentry) diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index 4ec80b96c22e..1d02d1170e21 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -435,6 +435,18 @@ * Check permission before removing the extended attribute * identified by @name for @dentry. * Return 0 if permission is granted. + * @inode_set_acl: + * Check permission before setting posix acls + * The posix acls in @kacl are identified by @acl_name. + * Return 0 if permission is granted. + * @inode_get_acl: + * Check permission before getting osix acls + * The posix acls are identified by @acl_name. + * Return 0 if permission is granted. + * @inode_remove_acl: + * Check permission before removing posix acls + * The posix acls are identified by @acl_name. + * Return 0 if permission is granted. * @inode_getsecurity: * Retrieve a copy of the extended attribute representation of the * security label associated with @name for @inode via @buffer. Note that diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h index 7d1e604c1325..ee608d22ecb9 100644 --- a/include/linux/posix_acl.h +++ b/include/linux/posix_acl.h @@ -69,21 +69,21 @@ extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *); extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); extern struct posix_acl *get_posix_acl(struct inode *, int); -extern int set_posix_acl(struct user_namespace *, struct inode *, int, - struct posix_acl *); +int set_posix_acl(struct user_namespace *, struct dentry *, int, + struct posix_acl *); struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags); #ifdef CONFIG_FS_POSIX_ACL -int posix_acl_chmod(struct user_namespace *, struct inode *, umode_t); +int posix_acl_chmod(struct user_namespace *, struct dentry *, umode_t); extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, struct posix_acl **); int posix_acl_update_mode(struct user_namespace *, struct inode *, umode_t *, struct posix_acl **); -extern int simple_set_acl(struct user_namespace *, struct inode *, - struct posix_acl *, int); +int simple_set_acl(struct user_namespace *, struct dentry *, + struct posix_acl *, int); extern int simple_acl_create(struct inode *, struct inode *); struct posix_acl *get_cached_acl(struct inode *inode, int type); @@ -99,9 +99,16 @@ static inline void cache_no_acl(struct inode *inode) inode->i_acl = NULL; inode->i_default_acl = NULL; } + +int vfs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, struct posix_acl *kacl); +struct posix_acl *vfs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name); +int vfs_remove_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name); #else static inline int posix_acl_chmod(struct user_namespace *mnt_userns, - struct inode *inode, umode_t mode) + struct dentry *dentry, umode_t mode) { return 0; } @@ -126,8 +133,28 @@ static inline int posix_acl_create(struct inode *inode, umode_t *mode, static inline void forget_all_cached_acls(struct inode *inode) { } + +static inline int vfs_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *name, + struct posix_acl *acl) +{ + return -EOPNOTSUPP; +} + +static inline struct posix_acl *vfs_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return ERR_PTR(-EOPNOTSUPP); +} + +static inline int vfs_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_FS_POSIX_ACL */ -struct posix_acl *get_acl(struct inode *inode, int type); +struct posix_acl *get_inode_acl(struct inode *inode, int type); #endif /* __LINUX_POSIX_ACL_H */ diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h index 8163dd48c430..54cd7a14330d 100644 --- a/include/linux/posix_acl_xattr.h +++ b/include/linux/posix_acl_xattr.h @@ -33,33 +33,40 @@ posix_acl_xattr_count(size_t size) } #ifdef CONFIG_FS_POSIX_ACL -void posix_acl_fix_xattr_from_user(void *value, size_t size); -void posix_acl_fix_xattr_to_user(void *value, size_t size); -void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns, - const struct inode *inode, - void *value, size_t size); +struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, + const void *value, size_t size); #else -static inline void posix_acl_fix_xattr_from_user(void *value, size_t size) -{ -} -static inline void posix_acl_fix_xattr_to_user(void *value, size_t size) -{ -} -static inline void -posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns, - const struct inode *inode, void *value, - size_t size) +static inline struct posix_acl * +posix_acl_from_xattr(struct user_namespace *user_ns, const void *value, + size_t size) { + return ERR_PTR(-EOPNOTSUPP); } #endif -struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, - const void *value, size_t size); int posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl, void *buffer, size_t size); -struct posix_acl *vfs_set_acl_prepare(struct user_namespace *mnt_userns, - struct user_namespace *fs_userns, - const void *value, size_t size); +static inline const char *posix_acl_xattr_name(int type) +{ + switch (type) { + case ACL_TYPE_ACCESS: + return XATTR_NAME_POSIX_ACL_ACCESS; + case ACL_TYPE_DEFAULT: + return XATTR_NAME_POSIX_ACL_DEFAULT; + } + + return ""; +} + +static inline int posix_acl_type(const char *name) +{ + if (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) + return ACL_TYPE_ACCESS; + else if (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0) + return ACL_TYPE_DEFAULT; + + return -1; +} extern const struct xattr_handler posix_acl_access_xattr_handler; extern const struct xattr_handler posix_acl_default_xattr_handler; diff --git a/include/linux/security.h b/include/linux/security.h index ca1b7109c0db..2bfc2e1ce51f 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -361,6 +361,13 @@ int security_inode_getattr(const struct path *path); int security_inode_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry, const char *name, const void *value, size_t size, int flags); +int security_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl); +int security_inode_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name); +int security_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name); void security_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags); int security_inode_getxattr(struct dentry *dentry, const char *name); @@ -872,6 +879,28 @@ static inline int security_inode_setxattr(struct user_namespace *mnt_userns, return cap_inode_setxattr(dentry, name, value, size, flags); } +static inline int security_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name, + struct posix_acl *kacl) +{ + return 0; +} + +static inline int security_inode_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return 0; +} + +static inline int security_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *acl_name) +{ + return 0; +} + static inline void security_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { } diff --git a/include/linux/xattr.h b/include/linux/xattr.h index 4c379d23ec6e..c5238744bab9 100644 --- a/include/linux/xattr.h +++ b/include/linux/xattr.h @@ -22,6 +22,12 @@ struct inode; struct dentry; +static inline bool is_posix_acl_xattr(const char *name) +{ + return (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || + (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0); +} + /* * struct xattr_handler: When @name is set, match attributes with exactly that * name. When @prefix is set instead, match attributes with that prefix and diff --git a/mm/shmem.c b/mm/shmem.c index 82911fefc2d5..c45eaf04396e 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1132,7 +1132,7 @@ static int shmem_setattr(struct user_namespace *mnt_userns, setattr_copy(&init_user_ns, inode, attr); if (attr->ia_valid & ATTR_MODE) - error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); + error = posix_acl_chmod(&init_user_ns, dentry, inode->i_mode); if (!error && update_ctime) { inode->i_ctime = current_time(inode); if (update_mtime) diff --git a/security/integrity/evm/evm_main.c b/security/integrity/evm/evm_main.c index 23d484e05e6f..e01cfd4ad896 100644 --- a/security/integrity/evm/evm_main.c +++ b/security/integrity/evm/evm_main.c @@ -8,7 +8,7 @@ * * File: evm_main.c * implements evm_inode_setxattr, evm_inode_post_setxattr, - * evm_inode_removexattr, and evm_verifyxattr + * evm_inode_removexattr, evm_verifyxattr, and evm_inode_set_acl. */ #define pr_fmt(fmt) "EVM: "fmt @@ -435,66 +435,6 @@ static enum integrity_status evm_verify_current_integrity(struct dentry *dentry) } /* - * evm_xattr_acl_change - check if passed ACL changes the inode mode - * @mnt_userns: user namespace of the idmapped mount - * @dentry: pointer to the affected dentry - * @xattr_name: requested xattr - * @xattr_value: requested xattr value - * @xattr_value_len: requested xattr value length - * - * Check if passed ACL changes the inode mode, which is protected by EVM. - * - * Returns 1 if passed ACL causes inode mode change, 0 otherwise. - */ -static int evm_xattr_acl_change(struct user_namespace *mnt_userns, - struct dentry *dentry, const char *xattr_name, - const void *xattr_value, size_t xattr_value_len) -{ -#ifdef CONFIG_FS_POSIX_ACL - umode_t mode; - struct posix_acl *acl = NULL, *acl_res; - struct inode *inode = d_backing_inode(dentry); - int rc; - - /* - * An earlier comment here mentioned that the idmappings for - * ACL_{GROUP,USER} don't matter since EVM is only interested in the - * mode stored as part of POSIX ACLs. Nonetheless, if it must translate - * from the uapi POSIX ACL representation to the VFS internal POSIX ACL - * representation it should do so correctly. There's no guarantee that - * we won't change POSIX ACLs in a way that ACL_{GROUP,USER} matters - * for the mode at some point and it's difficult to keep track of all - * the LSM and integrity modules and what they do to POSIX ACLs. - * - * Frankly, EVM shouldn't try to interpret the uapi struct for POSIX - * ACLs it received. It requires knowledge that only the VFS is - * guaranteed to have. - */ - acl = vfs_set_acl_prepare(mnt_userns, i_user_ns(inode), - xattr_value, xattr_value_len); - if (IS_ERR_OR_NULL(acl)) - return 1; - - acl_res = acl; - /* - * Passing mnt_userns is necessary to correctly determine the GID in - * an idmapped mount, as the GID is used to clear the setgid bit in - * the inode mode. - */ - rc = posix_acl_update_mode(mnt_userns, inode, &mode, &acl_res); - - posix_acl_release(acl); - - if (rc) - return 1; - - if (inode->i_mode != mode) - return 1; -#endif - return 0; -} - -/* * evm_xattr_change - check if passed xattr value differs from current value * @mnt_userns: user namespace of the idmapped mount * @dentry: pointer to the affected dentry @@ -513,10 +453,6 @@ static int evm_xattr_change(struct user_namespace *mnt_userns, char *xattr_data = NULL; int rc = 0; - if (posix_xattr_acl(xattr_name)) - return evm_xattr_acl_change(mnt_userns, dentry, xattr_name, - xattr_value, xattr_value_len); - rc = vfs_getxattr_alloc(&init_user_ns, dentry, xattr_name, &xattr_data, 0, GFP_NOFS); if (rc < 0) @@ -670,6 +606,86 @@ int evm_inode_removexattr(struct user_namespace *mnt_userns, return evm_protect_xattr(mnt_userns, dentry, xattr_name, NULL, 0); } +#ifdef CONFIG_FS_POSIX_ACL +static int evm_inode_set_acl_change(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *name, + struct posix_acl *kacl) +{ + int rc; + + umode_t mode; + struct inode *inode = d_backing_inode(dentry); + + if (!kacl) + return 1; + + rc = posix_acl_update_mode(mnt_userns, inode, &mode, &kacl); + if (rc || (inode->i_mode != mode)) + return 1; + + return 0; +} +#else +static inline int evm_inode_set_acl_change(struct user_namespace *mnt_userns, + struct dentry *dentry, + const char *name, + struct posix_acl *kacl) +{ + return 0; +} +#endif + +/** + * evm_inode_set_acl - protect the EVM extended attribute from posix acls + * @mnt_userns: user namespace of the idmapped mount + * @dentry: pointer to the affected dentry + * @acl_name: name of the posix acl + * @kacl: pointer to the posix acls + * + * Prevent modifying posix acls causing the EVM HMAC to be re-calculated + * and 'security.evm' xattr updated, unless the existing 'security.evm' is + * valid. + */ +int evm_inode_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, struct posix_acl *kacl) +{ + enum integrity_status evm_status; + + /* Policy permits modification of the protected xattrs even though + * there's no HMAC key loaded + */ + if (evm_initialized & EVM_ALLOW_METADATA_WRITES) + return 0; + + evm_status = evm_verify_current_integrity(dentry); + if ((evm_status == INTEGRITY_PASS) || + (evm_status == INTEGRITY_NOXATTRS)) + return 0; + + /* Exception if the HMAC is not going to be calculated. */ + if (evm_hmac_disabled() && (evm_status == INTEGRITY_NOLABEL || + evm_status == INTEGRITY_UNKNOWN)) + return 0; + + /* + * Writing other xattrs is safe for portable signatures, as portable + * signatures are immutable and can never be updated. + */ + if (evm_status == INTEGRITY_FAIL_IMMUTABLE) + return 0; + + if (evm_status == INTEGRITY_PASS_IMMUTABLE && + !evm_inode_set_acl_change(mnt_userns, dentry, acl_name, kacl)) + return 0; + + if (evm_status != INTEGRITY_PASS_IMMUTABLE) + integrity_audit_msg(AUDIT_INTEGRITY_METADATA, d_backing_inode(dentry), + dentry->d_name.name, "appraise_metadata", + integrity_status_msg[evm_status], + -EPERM, 0); + return -EPERM; +} + static void evm_reset_status(struct inode *inode) { struct integrity_iint_cache *iint; diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c index 3e0fbbd99534..3c9af3dc0713 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -774,6 +774,15 @@ int ima_inode_setxattr(struct dentry *dentry, const char *xattr_name, return result; } +int ima_inode_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry, + const char *acl_name, struct posix_acl *kacl) +{ + if (evm_revalidate_status(acl_name)) + ima_reset_appraise_flags(d_backing_inode(dentry), 0); + + return 0; +} + int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name) { int result; diff --git a/security/security.c b/security/security.c index 79d82cb6e469..bdc295ad5fba 100644 --- a/security/security.c +++ b/security/security.c @@ -1372,6 +1372,48 @@ int security_inode_setxattr(struct user_namespace *mnt_userns, return evm_inode_setxattr(mnt_userns, dentry, name, value, size); } +int security_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + ret = call_int_hook(inode_set_acl, 0, mnt_userns, dentry, acl_name, + kacl); + if (ret) + return ret; + ret = ima_inode_set_acl(mnt_userns, dentry, acl_name, kacl); + if (ret) + return ret; + return evm_inode_set_acl(mnt_userns, dentry, acl_name, kacl); +} + +int security_inode_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + return call_int_hook(inode_get_acl, 0, mnt_userns, dentry, acl_name); +} + +int security_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + int ret; + + if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) + return 0; + ret = call_int_hook(inode_remove_acl, 0, mnt_userns, dentry, acl_name); + if (ret) + return ret; + ret = ima_inode_remove_acl(mnt_userns, dentry, acl_name); + if (ret) + return ret; + return evm_inode_remove_acl(mnt_userns, dentry, acl_name); +} + void security_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f553c370397e..7c5c8d17695c 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3240,6 +3240,25 @@ static int selinux_inode_setxattr(struct user_namespace *mnt_userns, &ad); } +static int selinux_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + return dentry_has_perm(current_cred(), dentry, FILE__SETATTR); +} + +static int selinux_inode_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + return dentry_has_perm(current_cred(), dentry, FILE__GETATTR); +} + +static int selinux_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + return dentry_has_perm(current_cred(), dentry, FILE__SETATTR); +} + static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) @@ -7088,6 +7107,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(inode_getxattr, selinux_inode_getxattr), LSM_HOOK_INIT(inode_listxattr, selinux_inode_listxattr), LSM_HOOK_INIT(inode_removexattr, selinux_inode_removexattr), + LSM_HOOK_INIT(inode_set_acl, selinux_inode_set_acl), + LSM_HOOK_INIT(inode_get_acl, selinux_inode_get_acl), + LSM_HOOK_INIT(inode_remove_acl, selinux_inode_remove_acl), LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity), LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity), LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity), diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index b6306d71c908..cadef2f6a75e 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1393,6 +1393,74 @@ static int smack_inode_removexattr(struct user_namespace *mnt_userns, } /** + * smack_inode_set_acl - Smack check for setting posix acls + * @mnt_userns: the userns attached to the mnt this request came from + * @dentry: the object + * @acl_name: name of the posix acl + * @kacl: the posix acls + * + * Returns 0 if access is permitted, an error code otherwise + */ +static int smack_inode_set_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name, + struct posix_acl *kacl) +{ + struct smk_audit_info ad; + int rc; + + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); + smk_ad_setfield_u_fs_path_dentry(&ad, dentry); + + rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); + rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); + return rc; +} + +/** + * smack_inode_get_acl - Smack check for getting posix acls + * @mnt_userns: the userns attached to the mnt this request came from + * @dentry: the object + * @acl_name: name of the posix acl + * + * Returns 0 if access is permitted, an error code otherwise + */ +static int smack_inode_get_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + struct smk_audit_info ad; + int rc; + + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); + smk_ad_setfield_u_fs_path_dentry(&ad, dentry); + + rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad); + rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc); + return rc; +} + +/** + * smack_inode_remove_acl - Smack check for getting posix acls + * @mnt_userns: the userns attached to the mnt this request came from + * @dentry: the object + * @acl_name: name of the posix acl + * + * Returns 0 if access is permitted, an error code otherwise + */ +static int smack_inode_remove_acl(struct user_namespace *mnt_userns, + struct dentry *dentry, const char *acl_name) +{ + struct smk_audit_info ad; + int rc; + + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY); + smk_ad_setfield_u_fs_path_dentry(&ad, dentry); + + rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_WRITE, &ad); + rc = smk_bu_inode(d_backing_inode(dentry), MAY_WRITE, rc); + return rc; +} + +/** * smack_inode_getsecurity - get smack xattrs * @mnt_userns: active user namespace * @inode: the object @@ -4816,6 +4884,9 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(inode_post_setxattr, smack_inode_post_setxattr), LSM_HOOK_INIT(inode_getxattr, smack_inode_getxattr), LSM_HOOK_INIT(inode_removexattr, smack_inode_removexattr), + LSM_HOOK_INIT(inode_set_acl, smack_inode_set_acl), + LSM_HOOK_INIT(inode_get_acl, smack_inode_get_acl), + LSM_HOOK_INIT(inode_remove_acl, smack_inode_remove_acl), LSM_HOOK_INIT(inode_getsecurity, smack_inode_getsecurity), LSM_HOOK_INIT(inode_setsecurity, smack_inode_setsecurity), LSM_HOOK_INIT(inode_listsecurity, smack_inode_listsecurity), |