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ALSA: pcm: Fix potential Spectre v1 vulnerability 

commit 94ffb030b6d31ec840bb811be455dd2e26a4f43e upstream.

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

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Gustavo A. R. Silva 2018-12-12 15:36:28 -06:00 committed by syphyr
parent c0336ddcb0
commit 05e6cde9b4
1 changed files with 2 additions and 0 deletions
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2
sound/core/pcm.c
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@ -25,6 +25,7 @@
#include <linux/time.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/nospec.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/pcm.h>
@ -126,6 +127,7 @@ static int snd_pcm_control_ioctl(struct snd_card *card,
return -EFAULT;
if (stream < 0 || stream > 1)
return -EINVAL;
stream = array_index_nospec(stream, 2);
if (get_user(subdevice, &info->subdevice))
return -EFAULT;
mutex_lock(&register_mutex);