linux-kernel - Re: [PATCH v11 5/5] kasan: don't run tests in async mode

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Message-ID: <ba95b920-9007-bf10-a09d-59f5d715a8c2@arm.com>
Date:   Sat, 30 Jan 2021 17:01:48 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v11 5/5] kasan: don't run tests in async mode



On 1/30/21 4:52 PM, Vincenzo Frascino wrote:
> From: Andrey Konovalov <andreyknvl@...gle.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@...gle.com>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino@....com>

With:

[   18.283644] 1..1
[   18.284167]     # Subtest: kasan
[   18.284444]     1..45
[   18.295536]     # kmalloc_oob_right: can't run KASAN tests in async mode
[   18.296873]     # kmalloc_oob_right: failed to initialize: -1
[   18.303714]     not ok 1 - kmalloc_oob_right
[   18.316439]     # kmalloc_oob_left: can't run KASAN tests in async mode
[   18.319466]     # kmalloc_oob_left: failed to initialize: -1
[   18.325001]     not ok 2 - kmalloc_oob_left

Tested-by: Vincenzo Frascino <vincenzo.frascino@....com>

> ---
>  lib/test_kasan.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> 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);
> 

-- 
Regards,
Vincenzo