linux-kernel - Re: [PATCH v7 4/4] powerpc: Book3S 64-bit "heavyweight" KASAN support

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Message-ID: <a060e08e-c119-0d37-d220-409b3d7539d3@c-s.fr>
Date:   Mon, 17 Feb 2020 07:45:46 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Michael Neuling <mikey@...ling.org>,
        Daniel Axtens <dja@...ens.net>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        kasan-dev@...glegroups.com, aneesh.kumar@...ux.ibm.com,
        bsingharora@...il.com
Subject: Re: [PATCH v7 4/4] powerpc: Book3S 64-bit "heavyweight" KASAN support



Le 17/02/2020 à 00:08, Michael Neuling a écrit :
> Daniel.
> 
> Can you start this commit message with a simple description of what you are
> actually doing? This reads like you've been on a long journey to Mordor and
> back, which as a reader of this patch in the long distant future, I don't care
> about. I just want to know what you're implementing.
> 
> Also I'm struggling to review this as I don't know what software or hardware
> mechanisms you are using to perform sanitisation.

KASAN is standard, it's simply using GCC ASAN in kernel mode, ie kernel 
is built with -fsanitize=kernel-address 
(https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html)

You have more details there: 
https://www.kernel.org/doc/html/latest/dev-tools/kasan.html

Christophe