fs: port acl to mnt_idmap

Convert to struct mnt_idmap.

Last cycle we merged the necessary infrastructure in
256c8aed2b42 ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.

Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.

Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.

Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>

5 files changed, 23 insertions, 23 deletions

diff --git a/include/linux/evm.h b/include/linux/evm.h
index e06aacd3e315..7dc1ee74169f 100644
--- a/include/linux/evm.h
+++ b/include/linux/evm.h
@@ -35,20 +35,20 @@ extern int evm_inode_removexattr(struct mnt_idmap *idmap,
 				 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,
+static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
 					     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,
+extern int evm_inode_set_acl(struct mnt_idmap *idmap,
 			     struct dentry *dentry, const char *acl_name,
 			     struct posix_acl *kacl);
-static inline int evm_inode_remove_acl(struct user_namespace *mnt_userns,
+static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
 				       struct dentry *dentry,
 				       const char *acl_name)
 {
-	return evm_inode_set_acl(mnt_userns, dentry, acl_name, NULL);
+	return evm_inode_set_acl(idmap, dentry, acl_name, NULL);
 }
 static inline void evm_inode_post_set_acl(struct dentry *dentry,
 					  const char *acl_name,
@@ -129,21 +129,21 @@ static inline void evm_inode_post_removexattr(struct dentry *dentry,
 	return;
 }
 
-static inline void evm_inode_post_remove_acl(struct user_namespace *mnt_userns,
+static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
 					     struct dentry *dentry,
 					     const char *acl_name)
 {
 	return;
 }
 
-static inline int evm_inode_set_acl(struct user_namespace *mnt_userns,
+static inline int evm_inode_set_acl(struct mnt_idmap *idmap,
 				    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,
+static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
 				       struct dentry *dentry,
 				       const char *acl_name)
 {
diff --git a/include/linux/ima.h b/include/linux/ima.h
index 6f470b658082..172b113a9864 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -187,14 +187,14 @@ extern void ima_inode_post_setattr(struct mnt_idmap *idmap,
 				   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,
+extern int ima_inode_set_acl(struct mnt_idmap *idmap,
 			     struct dentry *dentry, const char *acl_name,
 			     struct posix_acl *kacl);
-static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns,
+static inline int ima_inode_remove_acl(struct mnt_idmap *idmap,
 				       struct dentry *dentry,
 				       const char *acl_name)
 {
-	return ima_inode_set_acl(mnt_userns, dentry, acl_name, NULL);
+	return ima_inode_set_acl(idmap, dentry, acl_name, NULL);
 }
 extern int ima_inode_removexattr(struct dentry *dentry, const char *xattr_name);
 #else
@@ -217,7 +217,7 @@ static inline int ima_inode_setxattr(struct dentry *dentry,
 	return 0;
 }
 
-static inline int ima_inode_set_acl(struct user_namespace *mnt_userns,
+static inline int ima_inode_set_acl(struct mnt_idmap *idmap,
 				    struct dentry *dentry, const char *acl_name,
 				    struct posix_acl *kacl)
 {
@@ -231,7 +231,7 @@ static inline int ima_inode_removexattr(struct dentry *dentry,
 	return 0;
 }
 
-static inline int ima_inode_remove_acl(struct user_namespace *mnt_userns,
+static inline int ima_inode_remove_acl(struct mnt_idmap *idmap,
 				       struct dentry *dentry,
 				       const char *acl_name)
 {
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index f344c0e7387a..094b76dc7164 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -145,11 +145,11 @@ 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 mnt_idmap *idmap,
 	 struct dentry *dentry, const char *name)
-LSM_HOOK(int, 0, inode_set_acl, struct user_namespace *mnt_userns,
+LSM_HOOK(int, 0, inode_set_acl, struct mnt_idmap *idmap,
 	 struct dentry *dentry, const char *acl_name, struct posix_acl *kacl)
-LSM_HOOK(int, 0, inode_get_acl, struct user_namespace *mnt_userns,
+LSM_HOOK(int, 0, inode_get_acl, struct mnt_idmap *idmap,
 	 struct dentry *dentry, const char *acl_name)
-LSM_HOOK(int, 0, inode_remove_acl, struct user_namespace *mnt_userns,
+LSM_HOOK(int, 0, inode_remove_acl, struct mnt_idmap *idmap,
 	 struct dentry *dentry, const char *acl_name)
 LSM_HOOK(int, 0, inode_need_killpriv, struct dentry *dentry)
 LSM_HOOK(int, 0, inode_killpriv, struct mnt_idmap *idmap,
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 0282758ba400..21cc29b8a9e8 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -79,7 +79,7 @@ struct posix_acl *posix_acl_clone(const struct posix_acl *acl, gfp_t flags);
 int posix_acl_chmod(struct mnt_idmap *, 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 *,
+int posix_acl_update_mode(struct mnt_idmap *, struct inode *, umode_t *,
 			  struct posix_acl **);
 
 int simple_set_acl(struct mnt_idmap *, struct dentry *,
@@ -91,7 +91,7 @@ void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl);
 void forget_cached_acl(struct inode *inode, int type);
 void forget_all_cached_acls(struct inode *inode);
 int posix_acl_valid(struct user_namespace *, const struct posix_acl *);
-int posix_acl_permission(struct user_namespace *, struct inode *,
+int posix_acl_permission(struct mnt_idmap *, struct inode *,
 			 const struct posix_acl *, int);
 
 static inline void cache_no_acl(struct inode *inode)
diff --git a/include/linux/security.h b/include/linux/security.h
index 474373e631df..5984d0d550b4 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -361,12 +361,12 @@ int security_inode_getattr(const struct path *path);
 int security_inode_setxattr(struct mnt_idmap *idmap,
 			    struct dentry *dentry, const char *name,
 			    const void *value, size_t size, int flags);
-int security_inode_set_acl(struct user_namespace *mnt_userns,
+int security_inode_set_acl(struct mnt_idmap *idmap,
 			   struct dentry *dentry, const char *acl_name,
 			   struct posix_acl *kacl);
-int security_inode_get_acl(struct user_namespace *mnt_userns,
+int security_inode_get_acl(struct mnt_idmap *idmap,
 			   struct dentry *dentry, const char *acl_name);
-int security_inode_remove_acl(struct user_namespace *mnt_userns,
+int security_inode_remove_acl(struct mnt_idmap *idmap,
 			      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);
@@ -879,7 +879,7 @@ static inline int security_inode_setxattr(struct mnt_idmap *idmap,
 	return cap_inode_setxattr(dentry, name, value, size, flags);
 }
 
-static inline int security_inode_set_acl(struct user_namespace *mnt_userns,
+static inline int security_inode_set_acl(struct mnt_idmap *idmap,
 					 struct dentry *dentry,
 					 const char *acl_name,
 					 struct posix_acl *kacl)
@@ -887,14 +887,14 @@ static inline int security_inode_set_acl(struct user_namespace *mnt_userns,
 	return 0;
 }
 
-static inline int security_inode_get_acl(struct user_namespace *mnt_userns,
+static inline int security_inode_get_acl(struct mnt_idmap *idmap,
 					 struct dentry *dentry,
 					 const char *acl_name)
 {
 	return 0;
 }
 
-static inline int security_inode_remove_acl(struct user_namespace *mnt_userns,
+static inline int security_inode_remove_acl(struct mnt_idmap *idmap,
 					    struct dentry *dentry,
 					    const char *acl_name)
 {