linux-kernel - Re: fanotify use after free.

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Message-ID: <alpine.LNX.2.00.1401231607120.581@pobox.suse.cz>
Date:	Thu, 23 Jan 2014 16:07:45 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jan Kara <jack@...e.cz>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: fanotify use after free.

On Thu, 23 Jan 2014, Jan Kara wrote:

> > > > But refcounting seems like an overkill for this - there is exactly one
> > > > fanotify_response_event structure iff it is a permission event. So
> > > > something like the (completely untested) attached patch should fix the
> > > > problem. But I agree it's a bit ugly so we might want something different.
> > > > I'll try to think about something better tomorrow.
> > > 
> > > Ok, In the meantime, Dave, can you verify whether this hacky patch
> > > fixes your problem?
> > 
> > I reported the same slab corruption yesterday as well here:
> > 
> > 	https://lkml.org/lkml/2014/1/22/173
> > 
> > With the patch applied, I am still seeing the slab corruption, preceeded 
> > by GPF (which is not there without the patch) in 
> > lockref_put_or_lock(&dentry->d_lockref) in dput():
>   Hmm, OK. Can you please send me your .config? I'll try to reproduce this
> myself.

Attached.

The userspace is systemd-based.

-- 
Jiri Kosina
SUSE Labs
Download attachment "config.gz" of type "APPLICATION/x-gzip" (22901 bytes)