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fanotify: deny permissions when no event was sent

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If no event was sent to userspace we cannot expect userspace to respond to
permissions requests.  Today such requests just hang forever. This patch will
deny any permissions event which was unable to be sent to userspace.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin@sophos.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2010-11-08 18:08:14 -05:00
parent e8a7e48bb2
commit ecf6f5e7d6
1 changed files with 12 additions and 4 deletions
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16
fs/notify/fanotify/fanotify_user.c
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@ -106,7 +106,7 @@ static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
return client_fd;
}
static ssize_t fill_event_metadata(struct fsnotify_group *group,
static int fill_event_metadata(struct fsnotify_group *group,
struct fanotify_event_metadata *metadata,
struct fsnotify_event *event)
{
@ -257,10 +257,11 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
pr_debug("%s: group=%p event=%p\n", __func__, group, event);
fd = fill_event_metadata(group, &fanotify_event_metadata, event);
if (fd < 0)
return fd;
ret = fill_event_metadata(group, &fanotify_event_metadata, event);
if (ret < 0)
goto out;
fd = ret;
ret = prepare_for_access_response(group, event, fd);
if (ret)
goto out_close_fd;
@ -275,6 +276,13 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
remove_access_response(group, event, fd);
out_close_fd:
sys_close(fd);
out:
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
if (event->mask & FAN_ALL_PERM_EVENTS) {
event->response = FAN_DENY;
wake_up(&group->fanotify_data.access_waitq);
}
#endif
return ret;
}