Subject: [PATCH 6/6] arm64: compat: Check for AArch32 state

From: [email-masked] (Suzuki K. Poulose)
Date: Mon, 22 Feb 2016 11:37:42 +0000

On 09/02/16 17:36, Will Deacon wrote:
> On Thu, Jan 28, 2016 at 11:32:17AM +0000, Suzuki K Poulose wrote:
>> Make sure we have AArch32 state available for running COMPAT binaries.

>>   		 */
>>   		seq_puts(m, "Features\t:");
>> -		if (personality(current->personality) == PER_LINUX32) {
>> +		if (system_supports_32bit_el0() &&
>> +			personality(current->personality) == PER_LINUX32) {
>
> Wouldn't it be better to prevent tasks changing to the PER_LINUX32
> personality on systems that don't support AArch32 at EL0?

Yes, thats the ideal solution. I took a look at it  and it requires us to
hook in arm64 wrapper for the personality syscall. I will take a look.

Thanks
Suzuki