linux-kernel - Re: [PATCHv2] lib/test_kasan: add roundtrip tests

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Message-ID: <a699eb44-87ff-aa2b-140f-79de11374bdf@virtuozzo.com>
Date:   Mon, 19 Aug 2019 20:25:03 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Will Deacon <will.deacon@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCHv2] lib/test_kasan: add roundtrip tests



On 8/19/19 7:14 PM, Mark Rutland wrote:
> In several places we need to be able to operate on pointers which have
> gone via a roundtrip:
> 
> 	virt -> {phys,page} -> virt
> 
> With KASAN_SW_TAGS, we can't preserve the tag for SLUB objects, and the
> {phys,page} -> virt conversion will use KASAN_TAG_KERNEL.
> 
> This patch adds tests to ensure that this works as expected, without
> false positives which have recently been spotted [1,2] in testing.
> 
> [1] https://lore.kernel.org/linux-arm-kernel/20190819114420.2535-1-walter-zh.wu@mediatek.com/
> [2] https://lore.kernel.org/linux-arm-kernel/20190819132347.GB9927@lakrids.cambridge.arm.com/
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>
> Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>
> Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Will Deacon <will.deacon@....com>
> ---


Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>