fs: Rename anon_inode_getfile_secure() and anon_inode_getfd_secure()

The call to the inode_init_security_anon() LSM hook is not the sole
reason to use anon_inode_getfile_secure() or anon_inode_getfd_secure().
For example, the functions also allow one to create a file with non-zero
size, without needing a full-blown filesystem.  In this case, you don't
need a "secure" version, just unique inodes; the current name of the
functions is confusing and does not explain well the difference with
the more "standard" anon_inode_getfile() and anon_inode_getfd().

Of course, there is another side of the coin; neither io_uring nor
userfaultfd strictly speaking need distinct inodes, and it is not
that clear anymore that anon_inode_create_get{file,fd}() allow the LSM
to intercept and block the inode's creation.  If one was so inclined,
anon_inode_getfile_secure() and anon_inode_getfd_secure() could be kept,
using the shared inode or a new one depending on CONFIG_SECURITY.
However, this is probably overkill, and potentially a cause of bugs in
different configurations.  Therefore, just add a comment to io_uring
and userfaultfd explaining the choice of the function.

While at it, remove the export for what is now anon_inode_create_getfd().
There is no in-tree module that uses it, and the old name is gone anyway.
If anybody actually needs the symbol, they can ask or they can just use
anon_inode_create_getfile(), which will be exported very soon for use
in KVM.

Suggested-by: Christian Brauner <[email protected]>
Reviewed-by: Christian Brauner <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: bonzini

fs/anon_inodes.c

@@ -79,15 +79,15 @@ static struct file *__anon_inode_getfile(const char *name,
 					 const struct file_operations *fops,
 					 void *priv, int flags,
 					 const struct inode *context_inode,
-					 bool secure)
+					 bool make_inode)
 {
 	struct inode *inode;
 	struct file *file;
 
 	if (fops->owner && !try_module_get(fops->owner))
 		return ERR_PTR(-ENOENT);
 
-	if (secure) {
+	if (make_inode) {
 		inode =	anon_inode_make_secure_inode(name, context_inode);
 		if (IS_ERR(inode)) {
 			file = ERR_CAST(inode);
@@ -149,13 +149,10 @@ struct file *anon_inode_getfile(const char *name,
 EXPORT_SYMBOL_GPL(anon_inode_getfile);
 
 /**
- * anon_inode_getfile_secure - Like anon_inode_getfile(), but creates a new
+ * anon_inode_create_getfile - Like anon_inode_getfile(), but creates a new
  *                             !S_PRIVATE anon inode rather than reuse the
  *                             singleton anon inode and calls the
- *                             inode_init_security_anon() LSM hook.  This
- *                             allows for both the inode to have its own
- *                             security context and for the LSM to enforce
- *                             policy on the inode's creation.
+ *                             inode_init_security_anon() LSM hook.
  *
  * @name:    [in]    name of the "class" of the new file
  * @fops:    [in]    file operations for the new file
@@ -164,11 +161,21 @@ EXPORT_SYMBOL_GPL(anon_inode_getfile);
  * @context_inode:
  *           [in]    the logical relationship with the new inode (optional)
  *
+ * Create a new anonymous inode and file pair.  This can be done for two
+ * reasons:
+ *
+ * - for the inode to have its own security context, so that LSMs can enforce
+ *   policy on the inode's creation;
+ *
+ * - if the caller needs a unique inode, for example in order to customize
+ *   the size returned by fstat()
+ *
  * The LSM may use @context_inode in inode_init_security_anon(), but a
- * reference to it is not held.  Returns the newly created file* or an error
- * pointer.  See the anon_inode_getfile() documentation for more information.
+ * reference to it is not held.
+ *
+ * Returns the newly created file* or an error pointer.
  */
-struct file *anon_inode_getfile_secure(const char *name,
+struct file *anon_inode_create_getfile(const char *name,
 				       const struct file_operations *fops,
 				       void *priv, int flags,
 				       const struct inode *context_inode)
@@ -181,7 +188,7 @@ static int __anon_inode_getfd(const char *name,
 			      const struct file_operations *fops,
 			      void *priv, int flags,
 			      const struct inode *context_inode,
-			      bool secure)
+			      bool make_inode)
 {
 	int error, fd;
 	struct file *file;
@@ -192,7 +199,7 @@ static int __anon_inode_getfd(const char *name,
 	fd = error;
 
 	file = __anon_inode_getfile(name, fops, priv, flags, context_inode,
-				    secure);
+				    make_inode);
 	if (IS_ERR(file)) {
 		error = PTR_ERR(file);
 		goto err_put_unused_fd;
@@ -231,10 +238,9 @@ int anon_inode_getfd(const char *name, const struct file_operations *fops,
 EXPORT_SYMBOL_GPL(anon_inode_getfd);
 
 /**
- * anon_inode_getfd_secure - Like anon_inode_getfd(), but creates a new
+ * anon_inode_create_getfd - Like anon_inode_getfd(), but creates a new
  * !S_PRIVATE anon inode rather than reuse the singleton anon inode, and calls
- * the inode_init_security_anon() LSM hook. This allows the inode to have its
- * own security context and for a LSM to reject creation of the inode.
+ * the inode_init_security_anon() LSM hook.
  *
  * @name:    [in]    name of the "class" of the new file
  * @fops:    [in]    file operations for the new file
@@ -243,16 +249,26 @@ EXPORT_SYMBOL_GPL(anon_inode_getfd);
  * @context_inode:
  *           [in]    the logical relationship with the new inode (optional)
  *
+ * Create a new anonymous inode and file pair.  This can be done for two
+ * reasons:
+ *
+ * - for the inode to have its own security context, so that LSMs can enforce
+ *   policy on the inode's creation;
+ *
+ * - if the caller needs a unique inode, for example in order to customize
+ *   the size returned by fstat()
+ *
  * The LSM may use @context_inode in inode_init_security_anon(), but a
  * reference to it is not held.
+ *
+ * Returns a newly created file descriptor or an error code.
  */
-int anon_inode_getfd_secure(const char *name, const struct file_operations *fops,
+int anon_inode_create_getfd(const char *name, const struct file_operations *fops,
 			    void *priv, int flags,
 			    const struct inode *context_inode)
 {
 	return __anon_inode_getfd(name, fops, priv, flags, context_inode, true);
 }
-EXPORT_SYMBOL_GPL(anon_inode_getfd_secure);
 
 static int __init anon_inode_init(void)
 {

fs/userfaultfd.c

@@ -1033,7 +1033,7 @@ static int resolve_userfault_fork(struct userfaultfd_ctx *new,
 {
 	int fd;
 
-	fd = anon_inode_getfd_secure("[userfaultfd]", &userfaultfd_fops, new,
+	fd = anon_inode_create_getfd("[userfaultfd]", &userfaultfd_fops, new,
 			O_RDONLY | (new->flags & UFFD_SHARED_FCNTL_FLAGS), inode);
 	if (fd < 0)
 		return fd;
@@ -2205,7 +2205,8 @@ static int new_userfaultfd(int flags)
 	/* prevent the mm struct to be freed */
 	mmgrab(ctx->mm);
 
-	fd = anon_inode_getfd_secure("[userfaultfd]", &userfaultfd_fops, ctx,
+	/* Create a new inode so that the LSM can block the creation.  */
+	fd = anon_inode_create_getfd("[userfaultfd]", &userfaultfd_fops, ctx,
 			O_RDONLY | (flags & UFFD_SHARED_FCNTL_FLAGS), NULL);
 	if (fd < 0) {
 		mmdrop(ctx->mm);

include/linux/anon_inodes.h

@@ -15,13 +15,13 @@ struct inode;
 struct file *anon_inode_getfile(const char *name,
 				const struct file_operations *fops,
 				void *priv, int flags);
-struct file *anon_inode_getfile_secure(const char *name,
+struct file *anon_inode_create_getfile(const char *name,
 				       const struct file_operations *fops,
 				       void *priv, int flags,
 				       const struct inode *context_inode);
 int anon_inode_getfd(const char *name, const struct file_operations *fops,
 		     void *priv, int flags);
-int anon_inode_getfd_secure(const char *name,
+int anon_inode_create_getfd(const char *name,
 			    const struct file_operations *fops,
 			    void *priv, int flags,
 			    const struct inode *context_inode);

io_uring/io_uring.c

@@ -3835,7 +3835,8 @@ static struct file *io_uring_get_file(struct io_ring_ctx *ctx)
 		return ERR_PTR(ret);
 #endif
 
-	file = anon_inode_getfile_secure("[io_uring]", &io_uring_fops, ctx,
+	/* Create a new inode so that the LSM can block the creation.  */
+	file = anon_inode_create_getfile("[io_uring]", &io_uring_fops, ctx,
 					 O_RDWR | O_CLOEXEC, NULL);
 #if defined(CONFIG_UNIX)
 	if (IS_ERR(file)) {