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fanotify: update connector fsid cache on add mark

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When implementing connector fsid cache, we only initialized the cache
when the first mark added to object was added by FAN_REPORT_FID group.
We forgot to update conn->fsid when the second mark is added by
FAN_REPORT_FID group to an already attached connector without fsid
cache.

Reported-and-tested-by: syzbot+c277e8e2f46414645508@syzkaller.appspotmail.com
Fixes: 77115225ac ("fanotify: cache fsid in fsnotify_mark_connector")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2019-06-19 13:34:44 +03:00 • committed by Jan Kara
parent c6d9c35d16
commit c285a2f01d
3 changed files with 18 additions and 4 deletions
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4
include/linux/fsnotify_backend.h
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@ -292,7 +292,9 @@ typedef struct fsnotify_mark_connector __rcu *fsnotify_connp_t;
*/
struct fsnotify_mark_connector {
spinlock_t lock;
unsigned int type; /* Type of object [lock] */
unsigned short type; /* Type of object [lock] */
#define FSNOTIFY_CONN_FLAG_HAS_FSID 0x01
unsigned short flags; /* flags [lock] */
__kernel_fsid_t fsid; /* fsid of filesystem containing object */
union {
/* Object pointer [lock] */