linux-kernel - Re: sound: out-of-bounds write in snd_rawmidi_kernel

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Date:	Wed, 03 Feb 2016 10:35:14 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Dmitry Vyukov" <dvyukov@...gle.com>
Cc:	<alsa-devel@...a-project.org>, "Jaroslav Kysela" <perex@...ex.cz>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Alexander Potapenko" <glider@...gle.com>,
	"Kostya Serebryany" <kcc@...gle.com>,
	"syzkaller" <syzkaller@...glegroups.com>,
	"Sasha Levin" <sasha.levin@...cle.com>
Subject: Re: sound: out-of-bounds write in snd_rawmidi_kernel_write1

On Wed, 03 Feb 2016 09:57:50 +0100,
Dmitry Vyukov wrote:
> 
> Hello,
> 
> The following program triggers an out-of-bounds write in
> snd_rawmidi_kernel_write1 (run in parallel loop). It seems to try to
> copy -1 bytes (aka 4GB) from user space into kernel smashing all on
> its way.

What card is /dev/midi3?  Please check /proc/asound/cards.
Is it MTPAV?


Takashi