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fanotify: Make waits for fanotify events only killable 

Making waits for response to fanotify permission events interruptible
can result in EINTR returns from open(2) or other syscalls when there's
e.g. AV software that's monitoring the file. Orion reports that e.g.
bash is complaining like:

bash: /etc/bash_completion.d/itweb-settings.bash: Interrupted system call

So for now convert the wait from interruptible to only killable one.
That is mostly invisible to userspace. Sadly this breaks hibernation
with fanotify permission events pending again but we have to put more
thought into how to fix this without regressing userspace visible
behavior.

Reported-by: Orion Poplawski <orion@nwra.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2019-02-21 11:47:23 +01:00
parent fabf7f29b3
commit b519057981
1 changed files with 2 additions and 2 deletions
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4
fs/notify/fanotify/fanotify.c
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@ -92,8 +92,8 @@ static int fanotify_get_response(struct fsnotify_group *group,
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
ret = wait_event_interruptible(group->fanotify_data.access_waitq,
event->state == FAN_EVENT_ANSWERED);
ret = wait_event_killable(group->fanotify_data.access_waitq,
event->state == FAN_EVENT_ANSWERED);
/* Signal pending? */
if (ret < 0) {
spin_lock(&group->notification_lock);