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-rw-r--r--fs/ksmbd/vfs.c2
-rw-r--r--fs/ksmbd/vfs.h2
-rw-r--r--fs/overlayfs/overlayfs.h3
-rw-r--r--fs/posix_acl.c147
-rw-r--r--fs/xattr.c25
-rw-r--r--include/linux/posix_acl_xattr.h34
-rw-r--r--include/linux/xattr.h2
7 files changed, 151 insertions, 64 deletions
diff --git a/fs/ksmbd/vfs.c b/fs/ksmbd/vfs.c
index 05efcdf7a4a7..7c849024999f 100644
--- a/fs/ksmbd/vfs.c
+++ b/fs/ksmbd/vfs.c
@@ -963,7 +963,7 @@ ssize_t ksmbd_vfs_getxattr(struct user_namespace *user_ns,
*/
int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
struct dentry *dentry, const char *attr_name,
- const void *attr_value, size_t attr_size, int flags)
+ void *attr_value, size_t attr_size, int flags)
{
int err;
diff --git a/fs/ksmbd/vfs.h b/fs/ksmbd/vfs.h
index 8c37aaf936ab..70da4c0ba7ad 100644
--- a/fs/ksmbd/vfs.h
+++ b/fs/ksmbd/vfs.h
@@ -109,7 +109,7 @@ ssize_t ksmbd_vfs_casexattr_len(struct user_namespace *user_ns,
int attr_name_len);
int ksmbd_vfs_setxattr(struct user_namespace *user_ns,
struct dentry *dentry, const char *attr_name,
- const void *attr_value, size_t attr_size, int flags);
+ void *attr_value, size_t attr_size, int flags);
int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
size_t *xattr_stream_name_size, int s_type);
int ksmbd_vfs_remove_xattr(struct user_namespace *user_ns,
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index e22e20f4811a..6ec815b84d48 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -249,7 +249,8 @@ static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
const char *name, const void *value,
size_t size, int flags)
{
- int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name, value, size, flags);
+ int err = vfs_setxattr(ovl_upper_mnt_userns(ofs), dentry, name,
+ (void *)value, size, flags);
pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
dentry, name, min((int)size, 48), value, size, flags, err);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 962d32468eb4..d954852a0158 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -375,8 +375,7 @@ posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
goto check_perm;
break;
case ACL_USER:
- uid = mapped_kuid_fs(mnt_userns,
- i_user_ns(inode),
+ uid = mapped_kuid_fs(mnt_userns, &init_user_ns,
pa->e_uid);
if (uid_eq(uid, current_fsuid()))
goto mask;
@@ -390,8 +389,7 @@ posix_acl_permission(struct user_namespace *mnt_userns, struct inode *inode,
}
break;
case ACL_GROUP:
- gid = mapped_kgid_fs(mnt_userns,
- i_user_ns(inode),
+ gid = mapped_kgid_fs(mnt_userns, &init_user_ns,
pa->e_gid);
if (in_group_p(gid)) {
found = 1;
@@ -710,46 +708,127 @@ EXPORT_SYMBOL(posix_acl_update_mode);
/*
* Fix up the uids and gids in posix acl extended attributes in place.
*/
-static void posix_acl_fix_xattr_userns(
- struct user_namespace *to, struct user_namespace *from,
- struct user_namespace *mnt_userns,
- void *value, size_t size, bool from_user)
+static int posix_acl_fix_xattr_common(void *value, size_t size)
+{
+ struct posix_acl_xattr_header *header = value;
+ int count;
+
+ if (!header)
+ return -EINVAL;
+ if (size < sizeof(struct posix_acl_xattr_header))
+ return -EINVAL;
+ if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
+ return -EINVAL;
+
+ count = posix_acl_xattr_count(size);
+ if (count < 0)
+ return -EINVAL;
+ if (count == 0)
+ return -EINVAL;
+
+ 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;
int count;
+ vfsuid_t vfsuid;
+ vfsgid_t vfsgid;
kuid_t uid;
kgid_t gid;
- if (!value)
+ if (no_idmapping(mnt_userns, i_user_ns(inode)))
return;
- if (size < sizeof(struct posix_acl_xattr_header))
+
+ count = posix_acl_fix_xattr_common(value, size);
+ if (count < 0)
return;
- if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
+
+ 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, &init_user_ns, 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, &init_user_ns, gid);
+ entry->e_id = cpu_to_le32(from_kgid(&init_user_ns,
+ vfsgid_into_kgid(vfsgid)));
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+void posix_acl_setxattr_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;
+ 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_xattr_count(size);
+ count = posix_acl_fix_xattr_common(value, size);
if (count < 0)
return;
- if (count == 0)
+
+ 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 = VFSUIDT_INIT(uid);
+ uid = from_vfsuid(mnt_userns, &init_user_ns, vfsuid);
+ entry->e_id = cpu_to_le32(from_kuid(&init_user_ns, uid));
+ break;
+ case ACL_GROUP:
+ gid = make_kgid(&init_user_ns, le32_to_cpu(entry->e_id));
+ vfsgid = VFSGIDT_INIT(gid);
+ gid = from_vfsgid(mnt_userns, &init_user_ns, vfsgid);
+ entry->e_id = cpu_to_le32(from_kgid(&init_user_ns, gid));
+ 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));
- if (from_user)
- uid = mapped_kuid_user(mnt_userns, &init_user_ns, uid);
- else
- uid = mapped_kuid_fs(mnt_userns, &init_user_ns, uid);
entry->e_id = cpu_to_le32(from_kuid(to, uid));
break;
case ACL_GROUP:
gid = make_kgid(from, le32_to_cpu(entry->e_id));
- if (from_user)
- gid = mapped_kgid_user(mnt_userns, &init_user_ns, gid);
- else
- gid = mapped_kgid_fs(mnt_userns, &init_user_ns, gid);
entry->e_id = cpu_to_le32(from_kgid(to, gid));
break;
default:
@@ -758,34 +837,20 @@ static void posix_acl_fix_xattr_userns(
}
}
-void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size)
+void posix_acl_fix_xattr_from_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
-
- /* Leave ids untouched on non-idmapped mounts. */
- if (no_idmapping(mnt_userns, i_user_ns(inode)))
- mnt_userns = &init_user_ns;
- if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
+ if (user_ns == &init_user_ns)
return;
- posix_acl_fix_xattr_userns(&init_user_ns, user_ns, mnt_userns, value,
- size, true);
+ posix_acl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
}
-void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size)
+void posix_acl_fix_xattr_to_user(void *value, size_t size)
{
struct user_namespace *user_ns = current_user_ns();
-
- /* Leave ids untouched on non-idmapped mounts. */
- if (no_idmapping(mnt_userns, i_user_ns(inode)))
- mnt_userns = &init_user_ns;
- if ((user_ns == &init_user_ns) && (mnt_userns == &init_user_ns))
+ if (user_ns == &init_user_ns)
return;
- posix_acl_fix_xattr_userns(user_ns, &init_user_ns, mnt_userns, value,
- size, false);
+ posix_acl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
}
/*
diff --git a/fs/xattr.c b/fs/xattr.c
index e8dd03e4561e..a1f4998bc6be 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -282,9 +282,15 @@ 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)
+ const char *name, void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
struct inode *delegated_inode = NULL;
@@ -292,12 +298,16 @@ vfs_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
int error;
if (size && strcmp(name, XATTR_NAME_CAPS) == 0) {
- error = cap_convert_nscap(mnt_userns, dentry, &value, size);
+ error = cap_convert_nscap(mnt_userns, dentry,
+ (const void **)&value, size);
if (error < 0)
return error;
size = error;
}
+ if (size && is_posix_acl_xattr(name))
+ posix_acl_setxattr_idmapped_mnt(mnt_userns, inode, value, size);
+
retry_deleg:
inode_lock(inode);
error = __vfs_setxattr_locked(mnt_userns, dentry, name, value, size,
@@ -431,7 +441,10 @@ vfs_getxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
return ret;
}
nolsm:
- return __vfs_getxattr(dentry, inode, name, value, size);
+ 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;
}
EXPORT_SYMBOL_GPL(vfs_getxattr);
@@ -577,8 +590,7 @@ static void setxattr_convert(struct user_namespace *mnt_userns,
if (ctx->size &&
((strcmp(ctx->kname->name, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
(strcmp(ctx->kname->name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)))
- posix_acl_fix_xattr_from_user(mnt_userns, d_inode(d),
- ctx->kvalue, ctx->size);
+ posix_acl_fix_xattr_from_user(ctx->kvalue, ctx->size);
}
int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
@@ -695,8 +707,7 @@ do_getxattr(struct user_namespace *mnt_userns, struct dentry *d,
if (error > 0) {
if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
(strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_to_user(mnt_userns, d_inode(d),
- ctx->kvalue, error);
+ 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) {
diff --git a/include/linux/posix_acl_xattr.h b/include/linux/posix_acl_xattr.h
index 1766e1de6956..b6bd3eac2bcc 100644
--- a/include/linux/posix_acl_xattr.h
+++ b/include/linux/posix_acl_xattr.h
@@ -33,21 +33,31 @@ posix_acl_xattr_count(size_t size)
}
#ifdef CONFIG_FS_POSIX_ACL
-void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size);
-void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size);
+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);
+void posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+ const struct inode *inode,
+ void *value, size_t size);
#else
-static inline void posix_acl_fix_xattr_from_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- void *value, size_t size)
+static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
{
}
-static inline void posix_acl_fix_xattr_to_user(struct user_namespace *mnt_userns,
- struct inode *inode,
- 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 void
+posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
+ const struct inode *inode, void *value,
+ size_t size)
{
}
#endif
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 4c379d23ec6e..979a9d3e5bfb 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -61,7 +61,7 @@ int __vfs_setxattr_locked(struct user_namespace *, struct dentry *,
const char *, const void *, size_t, int,
struct inode **);
int vfs_setxattr(struct user_namespace *, struct dentry *, const char *,
- const void *, size_t, int);
+ void *, size_t, int);
int __vfs_removexattr(struct user_namespace *, struct dentry *, const char *);
int __vfs_removexattr_locked(struct user_namespace *, struct dentry *,
const char *, struct inode **);
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-30 16:17:05 +0000