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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: rawmidi: Fix potential Spectre v1 vulnerability
Date: Thu, 21 Mar 2019 13:24:55 +0100	[thread overview]
Message-ID: <s5hd0mkct48.wl-tiwai@suse.de> (raw)
In-Reply-To: <20190320211524.GA20363@embeddedor>

On Wed, 20 Mar 2019 22:15:24 +0100,
 Gustavo A. R. Silva  wrote:
> 
> info->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/rawmidi.c:604 __snd_rawmidi_info_select() warn: potential spectre issue 'rmidi->streams' [r] (local cap)
> 
> Fix this by sanitizing info->stream before using it to index
> rmidi->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://lore.kernel.org/lkml/20180423164740.GY17484@dhcp22.suse.cz/
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

Applied, thanks.


Takashi

      reply	other threads:[~2019-03-21 12:24 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-20 21:15 [PATCH] ALSA: rawmidi: Fix potential Spectre v1 vulnerability Gustavo A. R. Silva
2019-03-21 12:24 ` Takashi Iwai [this message]

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