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: seq: oss: Fix Spectre v1 vulnerability
Date: Thu, 21 Mar 2019 13:25:06 +0100 [thread overview]
Message-ID: <s5hbm24ct3x.wl-tiwai@suse.de> (raw)
In-Reply-To: <20190320234201.GA24574@embeddedor>
On Thu, 21 Mar 2019 00:42:01 +0100,
Gustavo A. R. Silva wrote:
>
> dev 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/seq/oss/seq_oss_synth.c:626 snd_seq_oss_synth_make_info() warn: potential spectre issue 'dp->synths' [w] (local cap)
>
> Fix this by sanitizing dev before using it to index dp->synths.
>
> 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
prev parent reply other threads:[~2019-03-21 12:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-20 23:42 [PATCH] ALSA: seq: oss: Fix Spectre v1 vulnerability Gustavo A. R. Silva
2019-03-21 12:25 ` Takashi Iwai [this message]
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