* [patch] fanotify: info leak in copy_event_to_user()
@ 2013-06-03 9:27 Dan Carpenter
0 siblings, 0 replies; only message in thread
From: Dan Carpenter @ 2013-06-03 9:27 UTC (permalink / raw)
To: Eric Paris; +Cc: linux-kernel, kernel-janitors
The ->reserverd field isn't cleared so we leak one byte of stack
information to userspace.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 6c80083..77cc85d 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -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))
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2013-06-03 9:27 [patch] fanotify: info leak in copy_event_to_user() Dan Carpenter
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