lkml.org 
[lkml]   [2019]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 31/88] ALSA: emu10k1: Fix potential Spectre v1 vulnerabilities
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gustavo A. R. Silva <gustavo@embeddedor.com>

commit 5ae4f61f012a097df93de2285070ec8e34716d29 upstream.

ipcm->substream 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/pci/emu10k1/emufx.c:1031 snd_emu10k1_ipcm_poke() warn: potential spectre issue 'emu->fx8010.pcm' [r] (local cap)
sound/pci/emu10k1/emufx.c:1075 snd_emu10k1_ipcm_peek() warn: potential spectre issue 'emu->fx8010.pcm' [r] (local cap)

Fix this by sanitizing ipcm->substream before using it to index emu->fx8010.pcm

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
sound/pci/emu10k1/emufx.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/sound/pci/emu10k1/emufx.c
+++ b/sound/pci/emu10k1/emufx.c
@@ -36,6 +36,7 @@
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/moduleparam.h>
+#include <linux/nospec.h>

#include <sound/core.h>
#include <sound/tlv.h>
@@ -1000,6 +1001,8 @@ static int snd_emu10k1_ipcm_poke(struct

if (ipcm->substream >= EMU10K1_FX8010_PCM_COUNT)
return -EINVAL;
+ ipcm->substream = array_index_nospec(ipcm->substream,
+ EMU10K1_FX8010_PCM_COUNT);
if (ipcm->channels > 32)
return -EINVAL;
pcm = &emu->fx8010.pcm[ipcm->substream];
@@ -1046,6 +1049,8 @@ static int snd_emu10k1_ipcm_peek(struct

if (ipcm->substream >= EMU10K1_FX8010_PCM_COUNT)
return -EINVAL;
+ ipcm->substream = array_index_nospec(ipcm->substream,
+ EMU10K1_FX8010_PCM_COUNT);
pcm = &emu->fx8010.pcm[ipcm->substream];
mutex_lock(&emu->fx8010.lock);
spin_lock_irq(&emu->reg_lock);

\
 
 \ /
  Last update: 2019-01-11 15:17    [W:0.232 / U:4.460 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site