From: David Howells <dhowells@redhat.com>
Date: Thu, 4 May 2017 22:30:16 +0000 (+0100)
Subject: Make stat/lstat/fstatat pass AT_NO_AUTOMOUNT to vfs_statx()
X-Git-Tag: v4.14-rc1~955^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=deccf497d804a4c5fca2dbfad2f104675a6f9102;p=platform%2Fkernel%2Flinux-rpi.git

Make stat/lstat/fstatat pass AT_NO_AUTOMOUNT to vfs_statx()

stat/lstat/fstatat need to pass AT_NO_AUTOMOUNT to vfs_statx() as the
pre-statx code didn't set LOOKUP_AUTOMOUNT, even though fstatat() accepted
the AT_NO_AUTOMOUNT flag.

Fixes: a528d35e8bfc ("statx: Add a system call to make enhanced file info available")
Reported-by: Ian Kent <raven@themaw.net>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Ian Kent <raven@themaw.net>
cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/include/linux/fs.h b/include/linux/fs.h
index fc1b4fa..866c955 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2920,17 +2920,19 @@ extern int vfs_statx_fd(unsigned int, struct kstat *, u32, unsigned int);
 
 static inline int vfs_stat(const char __user *filename, struct kstat *stat)
 {
-	return vfs_statx(AT_FDCWD, filename, 0, stat, STATX_BASIC_STATS);
+	return vfs_statx(AT_FDCWD, filename, AT_NO_AUTOMOUNT,
+			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_lstat(const char __user *name, struct kstat *stat)
 {
-	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW,
+	return vfs_statx(AT_FDCWD, name, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT,
 			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_fstatat(int dfd, const char __user *filename,
 			      struct kstat *stat, int flags)
 {
-	return vfs_statx(dfd, filename, flags, stat, STATX_BASIC_STATS);
+	return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT,
+			 stat, STATX_BASIC_STATS);
 }
 static inline int vfs_fstat(int fd, struct kstat *stat)
 {