linux-kernel - Re: [PATCH v4 5/5] kasan: added functions for unpoisoning stack variables

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Date:   Tue, 5 Dec 2017 19:37:31 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Paul Lawrence <paullawrence@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-kbuild@...r.kernel.org,
        Matthias Kaehlcke <mka@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCH v4 5/5] kasan: added functions for unpoisoning stack
 variables



On 12/04/2017 10:17 PM, Paul Lawrence wrote:
> From: Alexander Potapenko <glider@...gle.com>
> 
> As a code-size optimization, LLVM builds since r279383 may
> bulk-manipulate the shadow region when (un)poisoning large memory
> blocks.  This requires new callbacks that simply do an uninstrumented
> memset().
> 
> This fixes linking the Clang-built kernel when using KASAN.
> 
> Signed-off-by: Alexander Potapenko <glider@...gle.com>
> [ghackmann@...gle.com: fix memset() parameters, and tweak
>  commit message to describe new callbacks]
> Signed-off-by: Greg Hackmann <ghackmann@...gle.com>
> Signed-off-by: Paul Lawrence <paullawrence@...gle.com>
> ---

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