[PATCH 4.4 22/44] ALSA: hdspm: Hardening for potential Spectre v1

From: Greg Kroah-Hartman
Date: Mon Apr 30 2018 - 15:26:20 EST


4.4-stable review patch. If anyone has any objections, please let me know.

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

From: Takashi Iwai <tiwai@xxxxxxx>

commit 10513142a7114d251670361ad40cba2c61403406 upstream.

As recently Smatch suggested, a couple of places in HDSP MADI driver
may expand the array directly from the user-space value with
speculation:
sound/pci/rme9652/hdspm.c:5717 snd_hdspm_channel_info() warn: potential spectre issue 'hdspm->channel_map_out' (local cap)
sound/pci/rme9652/hdspm.c:5734 snd_hdspm_channel_info() warn: potential spectre issue 'hdspm->channel_map_in' (local cap)

This patch puts array_index_nospec() for hardening against them.

BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
sound/pci/rme9652/hdspm.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)

--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -137,6 +137,7 @@
#include <linux/pci.h>
#include <linux/math64.h>
#include <linux/io.h>
+#include <linux/nospec.h>

#include <sound/core.h>
#include <sound/control.h>
@@ -5692,40 +5693,43 @@ static int snd_hdspm_channel_info(struct
struct snd_pcm_channel_info *info)
{
struct hdspm *hdspm = snd_pcm_substream_chip(substream);
+ unsigned int channel = info->channel;

if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- if (snd_BUG_ON(info->channel >= hdspm->max_channels_out)) {
+ if (snd_BUG_ON(channel >= hdspm->max_channels_out)) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: output channel out of range (%d)\n",
- info->channel);
+ channel);
return -EINVAL;
}

- if (hdspm->channel_map_out[info->channel] < 0) {
+ channel = array_index_nospec(channel, hdspm->max_channels_out);
+ if (hdspm->channel_map_out[channel] < 0) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: output channel %d mapped out\n",
- info->channel);
+ channel);
return -EINVAL;
}

- info->offset = hdspm->channel_map_out[info->channel] *
+ info->offset = hdspm->channel_map_out[channel] *
HDSPM_CHANNEL_BUFFER_BYTES;
} else {
- if (snd_BUG_ON(info->channel >= hdspm->max_channels_in)) {
+ if (snd_BUG_ON(channel >= hdspm->max_channels_in)) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: input channel out of range (%d)\n",
- info->channel);
+ channel);
return -EINVAL;
}

- if (hdspm->channel_map_in[info->channel] < 0) {
+ channel = array_index_nospec(channel, hdspm->max_channels_in);
+ if (hdspm->channel_map_in[channel] < 0) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: input channel %d mapped out\n",
- info->channel);
+ channel);
return -EINVAL;
}

- info->offset = hdspm->channel_map_in[info->channel] *
+ info->offset = hdspm->channel_map_in[channel] *
HDSPM_CHANNEL_BUFFER_BYTES;
}