From: Takashi Iwai <tiwai@suse.de>
To: " Gustavo A. R. Silva " <gustavo@embeddedor.com>
Cc: "Jaroslav Kysela" <perex@perex.cz>, <alsa-devel@alsa-project.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ALSA: pcm: Fix potential Spectre v1 vulnerability
Date: Thu, 13 Dec 2018 09:15:35 +0100 [thread overview]
Message-ID: <s5hpnu5u9js.wl-tiwai@suse.de> (raw)
In-Reply-To: <20181212213628.GA29911@embeddedor>
On Wed, 12 Dec 2018 22:36:28 +0100,
Gustavo A. R. Silva wrote:
>
> stream is indirectly controlled by user-space, hence leading to
> a potential exploitation of the Spectre variant 1 vulnerability.
>
> This issue was detected with the help of Smatch:
>
> sound/core/pcm.c:140 snd_pcm_control_ioctl() warn: potential spectre issue 'pcm->streams' [r] (local cap)
>
> Fix this by sanitizing stream before using it to index pcm->streams
>
> Notice that given that speculation windows are large, the policy is
> to kill the speculation on the first load and not worry if it can be
> completed with a dependent load/store [1].
>
> [1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
>
> Cc: stable@vger.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Applied now (again after moving the include line into a more
appropriate place).
thanks,
Takashi
prev parent reply other threads:[~2018-12-13 8:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 21:36 [PATCH] ALSA: pcm: Fix potential Spectre v1 vulnerability Gustavo A. R. Silva
2018-12-13 8:15 ` Takashi Iwai [this message]
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