Re: [PATCH v12 7/7] kasan: don't run tests in async mode

[Vincenzo Frascino <vincenzo.frascino@arm.com>]

On 2/9/21 12:02 PM, Catalin Marinas wrote:
> On Mon, Feb 08, 2021 at 04:56:17PM +0000, Vincenzo Frascino wrote:
>> From: Andrey Konovalov <andreyknvl@google.com>
>>
>> Asynchronous KASAN mode doesn't guarantee that a tag fault will be
>> detected immediately and causes tests to fail. Forbid running them
>> in asynchronous mode.
>>
>> Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> 
> That's missing your SoB.
>

Yes, I will add it in the next iteration.

>> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
>> index 7285dcf9fcc1..f82d9630cae1 100644
>> --- a/lib/test_kasan.c
>> +++ b/lib/test_kasan.c
>> @@ -51,6 +51,10 @@ static int kasan_test_init(struct kunit *test)
>>  		kunit_err(test, "can't run KASAN tests with KASAN disabled");
>>  		return -1;
>>  	}
>> +	if (kasan_flag_async) {
>> +		kunit_err(test, "can't run KASAN tests in async mode");
>> +		return -1;
>> +	}
>>  
>>  	multishot = kasan_save_enable_multi_shot();
>>  	hw_set_tagging_report_once(false);
> 
> I think we can still run the kasan tests in async mode if we check the
> TFSR_EL1 at the end of each test by calling mte_check_tfsr_exit().
> 

IIUC this was the plan for the future. But I let Andrey comment for more details.

-- 
Regards,
Vincenzo