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>

1 files changed, 5 insertions, 3 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index fc1b4faa6272..866c955314db 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)
 {