linux-kernel - Re: fanotify use after free.

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Message-ID: <20140123003240.GA25547@redhat.com>
Date:	Wed, 22 Jan 2014 19:32:40 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: fanotify use after free.

On Wed, Jan 22, 2014 at 04:08:52PM -0800, Linus Torvalds wrote:
 > On Wed, Jan 22, 2014 at 3:36 PM, Jan Kara <jack@...e.cz> 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?

It actually seems worse. I see the tail end of what looks like a slab corruption
trace, and then a total lockup.  And of course none of this makes it over ttyUSB0
because it happens so early. Grr.

	Dave

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