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fanotify: info leak in copy_event_to_user() 

The ->reserved field isn't cleared so we leak one byte of stack
information to userspace.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Carpenter 2013-07-08 15:59:40 -07:00 committed by Linus Torvalds
parent b9ce54c9f5
commit de1e0c40ac
1 changed files with 1 additions and 0 deletions
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fs/notify/fanotify/fanotify_user.c
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@ -122,6 +122,7 @@ static int fill_event_metadata(struct fsnotify_group *group,
metadata->event_len = FAN_EVENT_METADATA_LEN;
metadata->metadata_len = FAN_EVENT_METADATA_LEN;
metadata->vers = FANOTIFY_METADATA_VERSION;
metadata->reserved = 0;
metadata->mask = event->mask & FAN_ALL_OUTGOING_EVENTS;
metadata->pid = pid_vnr(event->tgid);
if (unlikely(event->mask & FAN_Q_OVERFLOW))