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| author | Jan Kara <jack@suse.cz> | 2014-01-28 21:38:06 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2014-01-29 13:57:17 +0100 |
| commit | 85816794240b9659e66e4d9b0df7c6e814e5f603 (patch) | |
| tree | dd9a5103e62f15e74b2d7729e972d141845462aa /fs/notify/fanotify/fanotify_user.c | |
| parent | 83c0e1b442b488571f4fef4a91c2fe52eed6c705 (diff) | |
| download | linux-stable-85816794240b9659e66e4d9b0df7c6e814e5f603.tar.gz linux-stable-85816794240b9659e66e4d9b0df7c6e814e5f603.tar.bz2 linux-stable-85816794240b9659e66e4d9b0df7c6e814e5f603.zip | |
fanotify: Fix use after free for permission events
Currently struct fanotify_event_info has been destroyed immediately
after reporting its contents to userspace. However that is wrong for
permission events because those need to stay around until userspace
provides response which is filled back in fanotify_event_info. So change
to code to free permission events only after we have got the response
from userspace.
Reported-and-tested-by: Jiri Kosina <jkosina@suse.cz>
Reported-and-tested-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify/fanotify_user.c')
| -rw-r--r-- | fs/notify/fanotify/fanotify_user.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c index 1fd66abe5740..b6175fa11bf8 100644 --- a/fs/notify/fanotify/fanotify_user.c +++ b/fs/notify/fanotify/fanotify_user.c @@ -319,7 +319,12 @@ static ssize_t fanotify_read(struct file *file, char __user *buf, if (IS_ERR(kevent)) break; ret = copy_event_to_user(group, kevent, buf); - fsnotify_destroy_event(group, kevent); + /* + * Permission events get destroyed after we + * receive response + */ + if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) + fsnotify_destroy_event(group, kevent); if (ret < 0) break; buf += ret; |