linux-kernel - Re: [PATCH v5] kasan/quarantine: fix bugs on qlist_move

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Message-ID: <CAG_fn=WQDL1hUbqt84CUOjTkOu7ySKQ+SWenWA+5dm-rmV0OKw@mail.gmail.com>
Date:	Wed, 6 Jul 2016 18:40:42 +0200
From:	Alexander Potapenko <glider@...gle.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	kasan-dev <kasan-dev@...glegroups.com>,
	Kuthonuzo Luruo <poll.stdin@...il.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v5] kasan/quarantine: fix bugs on qlist_move_cache()

On Wed, Jul 6, 2016 at 9:40 AM, Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
>
>
> On 07/06/2016 03:52 AM, js1304@...il.com wrote:
>> From: Joonsoo Kim <iamjoonsoo.kim@....com>
>>
>> There are two bugs on qlist_move_cache(). One is that qlist's tail
>> isn't set properly. curr->next can be NULL since it is singly linked
>> list and NULL value on tail is invalid if there is one item on qlist.
>> Another one is that if cache is matched, qlist_put() is called and
>> it will set curr->next to NULL. It would cause to stop the loop
>> prematurely.
>>
>> These problems come from complicated implementation so I'd like to
>> re-implement it completely. Implementation in this patch is really
>> simple. Iterate all qlist_nodes and put them to appropriate list.
Neat trick :)
>> Unfortunately, I got this bug sometime ago and lose oops message.
>> But, the bug looks trivial and no need to attach oops.
>>
>> v5: rename some variable for better readability
>> v4: fix cache size bug s/cache->size/obj_cache->size/
>> v3: fix build warning
>>
>> Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>
>> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
>
> Fixes: 55834c59098d ("mm: kasan: initial memory quarantine implementation")
> Acked-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
>
Acked-by: Alexander Potapenko <glider@...gle.com>


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Alexander Potapenko
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