On 04/29/2018 09:48 PM, speck for Konrad Rzeszutek Wilk wrote:
>> SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
>>  		unsigned long, arg4, unsigned long, arg5)
>>  {
>> @@ -2450,6 +2462,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsi
>>  	case PR_SVE_GET_VL:
>>  		error = SVE_GET_VL();
>>  		break;
>> +	case PR_SET_SPECULATION_CTRL:
>> +		error = arch_prctl_set_spec_ctrl(arg2, arg3);
> Would it make sense to also test arg4, arg5? And if somebody provided any value
> in them to return -EINVAL?

Maybe, but the other prctl's don't do this for args they don't use yet.

Jon.

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