diff options
| author | Miklos Szeredi <mszeredi@redhat.com> | 2016-09-16 12:44:20 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-22 12:26:56 +0200 |
| commit | b3b4283f7e46f563b438e587a0a567118a45a3fd (patch) | |
| tree | 2639531ebe0eba5fdc715778a4cca2a8952259cc /include | |
| parent | 1832397d8ce4de6827fb102a70649c63e7a2f9a2 (diff) | |
vfs: move permission checking into notify_change() for utimes(NULL)
commit f2b20f6ee842313a0d681dbbf7f87b70291a6a3b upstream.
This fixes a bug where the permission was not properly checked in
overlayfs. The testcase is ltp/utimensat01.
It is also cleaner and safer to do the permission checking in the vfs
helper instead of the caller.
This patch introduces an additional ia_valid flag ATTR_TOUCH (since
touch(1) is the most obvious user of utimes(NULL)) that is passed into
notify_change whenever the conditions for this special permission checking
mode are met.
Reported-by: Aihua Zhang <zhangaihua1@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Tested-by: Aihua Zhang <zhangaihua1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 0166582c4d78..e1a123760dbf 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -226,6 +226,7 @@ typedef void (dax_iodone_t)(struct buffer_head *bh_map, int uptodate); #define ATTR_KILL_PRIV (1 << 14) #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ #define ATTR_TIMES_SET (1 << 16) +#define ATTR_TOUCH (1 << 17) /* * Whiteout is represented by a char device. The following constants define the |