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From: Takashi Iwai <tiwai@suse.de>
To: butt3rflyh4ck <butterflyhuangxx@gmail.com>
Cc: alsa-devel@alsa-project.org, LKML <linux-kernel@vger.kernel.org>,
	pierre-louis.bossart@linux.intel.com, tiwai@suse.com,
	broonie@kernel.org
Subject: Re: A divide error bug in snd_pcm_write
Date: Mon, 26 Sep 2022 20:01:25 +0200	[thread overview]
Message-ID: <87leq6gglm.wl-tiwai@suse.de> (raw)
In-Reply-To: <CAFcO6XP2MpiAsF7YXYjgh7FMq+hyzFJjK8iBf=ccZ2B6BpNvOg@mail.gmail.com>

On Mon, 26 Sep 2022 19:16:48 +0200,
butt3rflyh4ck wrote:
> 
> The latest kernel upstream.
> Yes, but using mmap, you can map the runtime->status page, and then
> copy the data through memcpy to overwrite the status->state data, or
> even more, which is incredible.

Ah, then that's exactly the case my latest patch set covers.
Either the first patch or the second patch alone should work.
  https://lore.kernel.org/r/20220926135558.26580-2-tiwai@suse.de
  https://lore.kernel.org/r/20220926135558.26580-3-tiwai@suse.de

Could you verify either of them fixes the problem?


thanks,

Takashi

WARNING: multiple messages have this Message-ID (diff)
From: Takashi Iwai <tiwai@suse.de>
To: butt3rflyh4ck <butterflyhuangxx@gmail.com>
Cc: perex@perex.cz, tiwai@suse.com,
	pierre-louis.bossart@linux.intel.com, broonie@kernel.org,
	alsa-devel@alsa-project.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: A divide error bug in snd_pcm_write
Date: Mon, 26 Sep 2022 20:01:25 +0200	[thread overview]
Message-ID: <87leq6gglm.wl-tiwai@suse.de> (raw)
In-Reply-To: <CAFcO6XP2MpiAsF7YXYjgh7FMq+hyzFJjK8iBf=ccZ2B6BpNvOg@mail.gmail.com>

On Mon, 26 Sep 2022 19:16:48 +0200,
butt3rflyh4ck wrote:
> 
> The latest kernel upstream.
> Yes, but using mmap, you can map the runtime->status page, and then
> copy the data through memcpy to overwrite the status->state data, or
> even more, which is incredible.

Ah, then that's exactly the case my latest patch set covers.
Either the first patch or the second patch alone should work.
  https://lore.kernel.org/r/20220926135558.26580-2-tiwai@suse.de
  https://lore.kernel.org/r/20220926135558.26580-3-tiwai@suse.de

Could you verify either of them fixes the problem?


thanks,

Takashi

  reply	other threads:[~2022-09-26 18:02 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-26  9:26 A divide error bug in snd_pcm_write butt3rflyh4ck
2022-09-26 10:21 ` Takashi Iwai
2022-09-26 10:21   ` Takashi Iwai
2022-09-26 17:16   ` butt3rflyh4ck
2022-09-26 17:16     ` butt3rflyh4ck
2022-09-26 18:01     ` Takashi Iwai [this message]
2022-09-26 18:01       ` Takashi Iwai
2022-09-29 14:52       ` butt3rflyh4ck
2022-09-29 14:52         ` butt3rflyh4ck
2022-09-29 16:14         ` Takashi Iwai
2022-09-29 16:14           ` Takashi Iwai

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