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Date:   Tue, 5 Dec 2017 19:36:34 +0300
From:   Andrey Ryabinin <>
To:     Paul Lawrence <>,
        Alexander Potapenko <>,
        Dmitry Vyukov <>,
        Masahiro Yamada <>
        Matthias Kaehlcke <>,
        Michael Davidson <>,
        Greg Hackmann <>
Subject: Re: [PATCH v4 3/5] kasan: support alloca() poisoning

On 12/04/2017 10:17 PM, Paul Lawrence wrote:
> clang's AddressSanitizer implementation adds redzones on either side of
> alloca()ed buffers.  These redzones are 32-byte aligned and at least 32
> bytes long.
> __asan_alloca_poison() is passed the size and address of the allocated
> buffer, *excluding* the redzones on either side.  The left redzone will
> always be to the immediate left of this buffer; but AddressSanitizer may
> need to add padding between the end of the buffer and the right redzone.
> If there are any 8-byte chunks inside this padding, we should poison
> those too.
> __asan_allocas_unpoison() is just passed the top and bottom of the
> dynamic stack area, so unpoisoning is simpler.
> Signed-off-by: Greg Hackmann <>
> Signed-off-by: Paul Lawrence <>
> ---

Acked-by: Andrey Ryabinin <>

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