linux-kernel - Re: [PATCH 1/2] kasan: fix invalid-free test crashing the kernel

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Message-ID: <818fe418-01cd-4664-9844-46455b06842d@virtuozzo.com>
Date:   Fri, 2 Mar 2018 15:11:21 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nick Terrell <terrelln@...com>, Chris Mason <clm@...com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Jeff Layton <jlayton@...hat.com>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org
Cc:     Kostya Serebryany <kcc@...gle.com>
Subject: Re: [PATCH 1/2] kasan: fix invalid-free test crashing the kernel



On 03/01/2018 08:15 PM, Andrey Konovalov wrote:
> When an invalid-free is triggered by one of the KASAN tests, the object
> doesn't actually get freed. This later leads to a BUG failure in
> kmem_cache_destroy that checks that there are no allocated objects in the
> cache that is being destroyed. Fix this by calling kmem_cache_free with
> the proper object address after the call that triggers invalid-free.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

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