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fanotify: info leak in copy_event_to_user()

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

Signed-off-by: Dan Carpenter <[email protected]>
Cc: Eric Paris <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Carpenter 2013-07-08 15:59:40 -07:00 • committed by Linus Torvalds
commit de1e0c40ac
1 changed files with 1 additions and 0 deletions
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1
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))