linux-kernel - Re: KASAN: use-after-free Read in do_get

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Message-ID: <e08d4c87-1cc7-ea09-3459-e0d03a920519@suse.cz>
Date:   Wed, 18 Oct 2017 13:16:52 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        Chase Bertke <ceb2817@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: KASAN: use-after-free Read in do_get_mempolicy

On 10/17/2017 05:55 PM, Dmitry Vyukov wrote:
> On Tue, Oct 17, 2017 at 5:38 PM, Chase Bertke <ceb2817@...il.com> wrote:
>> Hello,
>>
>> I would like to report a bug found via syzkaller on version 4.13.0-rc4. I
>> have searched the syzkaller mailing list and did not see any other reports
>> for this bug.
>>
>> Please see below:
>>
>> ==================================================================
>> BUG: KASAN: use-after-free in do_get_mempolicy+0x1d4/0x740
>> Read of size 8 at addr ffff88006d32fb28 by task syz-executor0/1422
>>
>> CPU: 0 PID: 1422 Comm: syz-executor0 Not tainted 4.13.0-rc4+ #0

Most likely already fixed by 73223e4e2e38 ("mm/mempolicy: fix use after
free when calling get_mempolicy") which landed in v4.13-rc6.

Please focus the fuzzing the latest 4.14-rcX instead :)

Vlastimil