linux-kernel - Re: [PATCH v2] kasan: Support for r/w instrumentation control

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Message-ID: <6cc0eadc-5204-ce36-f5e8-88ba76bb6826@virtuozzo.com>
Date:   Tue, 13 Dec 2016 12:20:40 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Maninder Singh <maninder1.s@...sung.com>
CC:     Alexander Potapenko <glider@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Michal Marek <mmarek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        <linux-doc@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL BUILD + fi..." <linux-kbuild@...r.kernel.org>,
        PANKAJ MISHRA <pankaj.m@...sung.com>,
        "Ajeet Kumar Yadav" <ajeet.y@...sung.com>,
        Vaneet narang <v.narang@...sung.com>
Subject: Re: [PATCH v2] kasan: Support for r/w instrumentation control



On 12/13/2016 11:58 AM, Dmitry Vyukov wrote:

> --- a/Documentation/dev-tools/kasan.rst
> +++ b/Documentation/dev-tools/kasan.rst
> @@ -40,6 +40,14 @@ similar to the following to the respective kernel Makefile:
> 
>      KASAN_SANITIZE := n
> 
> +Sometimes it may be useful to disable instrumentation of reads, or writes
> +or both for the entire kernel. For example, if binary size is a concern,
> +it may be useful to disable instrumentation of reads to reduce binary size but
> +still catch more harmful bugs on writes. Or, if one is interested only in
> +sanitization of a particular module and performance is a concern, she can
> +disable instrumentation of both reads and writes for kernel code.
> +Instrumentation can be disabled with CONFIG_KASAN_READS and
> CONFIG_KASAN_WRITES.
> +

I don't understand this. How this can be related to modules? Configs are global.
You can't just disable/enable config per module.

>  Error reports
>