[PATCH 4.18 084/123] hwmon: (nct6775) Fix potential Spectre v1

From: Greg Kroah-Hartman
Date: Mon Sep 03 2018 - 13:37:08 EST


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

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

From: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

commit d49dbfade96d5b0863ca8a90122a805edd5ef50a upstream.

val can be 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:

vers/hwmon/nct6775.c:2698 store_pwm_weight_temp_sel() warn: potential
spectre issue 'data->temp_src' [r]

Fix this by sanitizing val before using it to index data->temp_src

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@xxxxxxxxxxxxxxx
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/hwmon/nct6775.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -63,6 +63,7 @@
#include <linux/bitops.h>
#include <linux/dmi.h>
#include <linux/io.h>
+#include <linux/nospec.h>
#include "lm75.h"

#define USE_ALTERNATE
@@ -2689,6 +2690,7 @@ store_pwm_weight_temp_sel(struct device
return err;
if (val > NUM_TEMP)
return -EINVAL;
+ val = array_index_nospec(val, NUM_TEMP + 1);
if (val && (!(data->have_temp & BIT(val - 1)) ||
!data->temp_src[val - 1]))
return -EINVAL;