4.18-stable review patch. If anyone has any objections, please let me know.
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From: Gustavo A. R. Silva gustavo@embeddedor.com
commit ddf74e79a54070f277ae520722d3bab7f7a6c67a upstream.
idx 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:
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c:408 amdgpu_set_pp_force_state() warn: potential spectre issue 'data.states'
Fix this by sanitizing idx before using it to index data.states
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: Alex Deucher alexander.deucher@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c @@ -31,7 +31,7 @@ #include <linux/power_supply.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> - +#include <linux/nospec.h>
static int amdgpu_debugfs_pm_init(struct amdgpu_device *adev);
@@ -393,6 +393,7 @@ static ssize_t amdgpu_set_pp_force_state count = -EINVAL; goto fail; } + idx = array_index_nospec(idx, ARRAY_SIZE(data.states));
amdgpu_dpm_get_pp_num_states(adev, &data); state = data.states[idx];