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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3f805e51-1db7-3e57-c9a3-15a20699ea54@kernel.dk>
Date:   Wed, 4 Mar 2020 07:40:02 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+e017e49c39ab484ac87a@...kaller.appspotmail.com>,
        Al Viro <viro@...iv.linux.org.uk>, io-uring@...r.kernel.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Cc:     Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>, tony.luck@...el.com,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: KASAN: use-after-free Read in percpu_ref_switch_to_atomic_rcu

On 3/4/20 12:59 AM, Dmitry Vyukov wrote:
> On Fri, Feb 7, 2020 at 9:14 AM syzbot
> <syzbot+e017e49c39ab484ac87a@...kaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    4c7d00cc Merge tag 'pwm/for-5.6-rc1' of git://git.kernel.o..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=12fec785e00000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=e162021ddededa72
>> dashboard link: https://syzkaller.appspot.com/bug?extid=e017e49c39ab484ac87a
>> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+e017e49c39ab484ac87a@...kaller.appspotmail.com
> 
> +io_uring maintainers
> 
> Here is a repro:
> https://gist.githubusercontent.com/dvyukov/6b340beab6483a036f4186e7378882ce/raw/cd1922185516453c201df8eded1d4b006a6d6a3a/gistfile1.txt

I've queued up a fix for this:

https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.6&id=9875fe3dc4b8cff1f1b440fb925054a5124403c3

-- 
Jens Axboe