linux-kernel - Re: [PATCH v3] mm/kasan: dump alloc and free stack for page allocator

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Date:   Thu, 12 Sep 2019 17:08:21 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Qian Cai <cai@....pw>,
        Walter Wu <walter-zh.wu@...iatek.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH v3] mm/kasan: dump alloc and free stack for page allocator



On 9/12/19 4:53 PM, Vlastimil Babka wrote:
> On 9/11/19 5:19 PM, Qian Cai wrote:
>>
>> The new config looks redundant and confusing. It looks to me more of a document update
>> in Documentation/dev-tools/kasan.txt to educate developers to select PAGE_OWNER and
>> DEBUG_PAGEALLOC if needed.
>  
> Agreed. But if you want it fully automatic, how about something
> like this (on top of mmotm/next)? If you agree I'll add changelog
> and send properly.
> 
> ----8<----
> 
> From a528d14c71d7fdf5872ca8ab3bd1b5bad26670c9 Mon Sep 17 00:00:00 2001
> From: Vlastimil Babka <vbabka@...e.cz>
> Date: Thu, 12 Sep 2019 15:51:23 +0200
> Subject: [PATCH] make KASAN enable page_owner with free stack capture
> 
> ---
>  include/linux/page_owner.h |  1 +
>  lib/Kconfig.kasan          |  4 ++++
>  mm/Kconfig.debug           |  5 +++++
>  mm/page_alloc.c            |  6 +++++-
>  mm/page_owner.c            | 37 ++++++++++++++++++++++++-------------
>  5 files changed, 39 insertions(+), 14 deletions(-)
> 

Looks ok to me. This certainly better than full dependency on the DEBUG_PAGEALLOC which we don't need.