linux-kernel - [ 04/11] vfs: allow O_PATH file descriptors for fstatfs()

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Message-Id: <20131018195049.370263767@linuxfoundation.org>
Date:	Fri, 18 Oct 2013 12:53:33 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 04/11] vfs: allow O_PATH file descriptors for fstatfs()

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@...ux-foundation.org>

commit 9d05746e7b16d8565dddbe3200faa1e669d23bbf upstream.

Olga reported that file descriptors opened with O_PATH do not work with
fstatfs(), found during further development of ksh93's thread support.

There is no reason to not allow O_PATH file descriptors here (fstatfs is
very much a path operation), so use "fdget_raw()".  See commit
55815f70147d ("vfs: make O_PATH file descriptors usable for 'fstat()'")
for a very similar issue reported for fstat() by the same team.

Reported-and-tested-by: ольга крыжановская <olga.kryzhanovska@...il.com>
Acked-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/statfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -87,7 +87,7 @@ int user_statfs(const char __user *pathn
 
 int fd_statfs(int fd, struct kstatfs *st)
 {
-	struct file *file = fget(fd);
+	struct file *file = fget_raw(fd);
 	int error = -EBADF;
 	if (file) {
 		error = vfs_statfs(&file->f_path, st);


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