linux-kernel - Re: [PATCH v2 1/3] unix: fix use-after-free in unix_dgram

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Message-ID: <87twq7ans7.fsf@doppelsaurus.mobileactivedefense.com>
Date:	Sat, 03 Oct 2015 18:02:16 +0100
From:	Rainer Weikusat <rweikusat@...ileactivedefense.com>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	Jason Baron <jbaron@...mai.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Wong <normalperson@...t.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Davide Libenzi <davidel@...ilserver.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Olivier Mauras <olivier@...ras.ch>,
	PaX Team <pageexec@...email.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 1/3] unix: fix use-after-free in unix_dgram_poll()

Mathias Krause <minipli@...glemail.com> writes:
> On 2 October 2015 at 22:43, Jason Baron <jbaron@...mai.com> wrote:
>> The unix_dgram_poll() routine calls sock_poll_wait() not only for the wait
>> queue associated with the socket s that we are poll'ing against, but also calls

[useless full-quote removed]

> My reproducer runs on this patch for more than 3 days now without
> triggering anything anymore.

Since the behaviour of your program is random, using it to "test"
anything doesn't really provide any insight: It could have been
executing the same codepath which doesn't happen to trigger any problems
for all of these three days. Nobody can tell.
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