Re: [PATCH v2] drm/i915: Fix potential spectre vulnerability

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 06/11/2023 09:57, Andi Shyti wrote:
> Hi Kunwu,
> 
> On Fri, Nov 03, 2023 at 10:32:57AM +0800, Kunwu Chan wrote:
>> Fix smatch warning:
>> drivers/gpu/drm/i915/gem/i915_gem_context.c:847 set_proto_ctx_sseu()
>> warn: potential spectre issue 'pc->user_engines' [r] (local cap)
>>
>> Fixes: d4433c7600f7 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)")
>> Cc: <stable@vger.kernel.org> # v5.15+
>> Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
>> Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
>> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
>> Link: https://lore.kernel.org/all/20231102101642.52988-1-chentao@kylinos.cn
>> ---
>>   drivers/gpu/drm/i915/gem/i915_gem_context.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
>> index 9a9ff84c90d7..e38f06a6e56e 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
>> @@ -844,6 +844,7 @@ static int set_proto_ctx_sseu(struct drm_i915_file_private *fpriv,
>>   		if (idx >= pc->num_user_engines)
>>   			return -EINVAL;
>>   
>> +		idx = array_index_nospec(idx, pc->num_user_engines);
> 
> you ignored my comment, though.

Sorry it was me, I considered it fine as is given it is the same pattern 
as elsewhere in the file. I've merged the patch btw.

Regards,

Tvrtko

> 
> Andi
> 
>>   		pe = &pc->user_engines[idx];
>>   
>>   		/* Only render engine supports RPCS configuration. */
>> -- 
>> 2.34.1