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Subject[PATCH 4.11 082/197] Make stat/lstat/fstatat pass AT_NO_AUTOMOUNT to vfs_statx()
Date
4.11-stable review patch.  If anyone has any objections, please let me know.

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

From: David Howells <dhowells@redhat.com>

commit deccf497d804a4c5fca2dbfad2f104675a6f9102 upstream.

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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
include/linux/fs.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2921,17 +2921,19 @@ extern int vfs_statx_fd(unsigned int, st

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)
{

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