linux-kernel - Re: sound: use-after-free in snd_timer

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Message-ID: <CACT4Y+Z22tC11KEad8DeFFQ0a6Rq-iyRryew02nYivz7WCR7nA@mail.gmail.com>
Date:	Fri, 15 Jan 2016 16:28:33 +0100
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	alsa-devel@...a-project.org, Jie Yang <yang.jie@...el.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: sound: use-after-free in snd_timer_interrupt

On Fri, Jan 15, 2016 at 4:21 PM, Takashi Iwai <tiwai@...e.de> wrote:
> So you're running this in parallel?  Or a tight sequential loop?
> I did the latter, and I tried even this on a bare metal, but couldn't
> trigger the Oops, so far.

Yes, I run it in parallel using:

$ go get golang.org/x/tools/cmd/stress
$ ./stress -p 8 ./a.out

But it just keeps 8 parallel processes running.


> Meanwhile, I pushed the tree including all fixes at for-linus branch:
>   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-linus
>
> It'd be appreciated if you can test this one.

Is it different from the patches you mailed? I keep several dozens
fixes for bugs that are not yet merged into Linus tree + own kcov
patch. It is not easy to rebase...
Here is what I now have for sound/
https://gist.githubusercontent.com/dvyukov/dc29dbfd320126285fd8/raw/e2ca7b59c0dc118045f9fb4e3d052cbc751e787e/gistfile1.txt