linux-kernel - Re: KASAN: use-after-scope Read in corrupted

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Message-ID: <CACT4Y+Zj0h69KdTKD8N7bcpJF4AMyDK0WGEQ8uueL5Nf3DC1YQ@mail.gmail.com>
Date:   Tue, 15 Jan 2019 08:25:51 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+bd36b7dd9330f67037ab@...kaller.appspotmail.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, Qian Cai <cai@....pw>,
        Chris von Recklinghausen <crecklin@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-scope Read in corrupted

On Tue, Jan 15, 2019 at 5:43 AM syzbot
<syzbot+bd36b7dd9330f67037ab@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    1bdbe2274920 Merge tag 'vfio-v5.0-rc2' of git://github.com..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1519d39f400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=edf1c3031097c304
> dashboard link: https://syzkaller.appspot.com/bug?extid=bd36b7dd9330f67037ab
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10fce14f400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=110b2017400000

Based on the reproducer this is:

#syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2


> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+bd36b7dd9330f67037ab@...kaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: use-after-scope in debug_lockdep_rcu_enabled.part.0+0x50/0x60
> kernel/rcu/update.c:249
> Read of size 4 at addr ffff8880a945eabc by task
> `9������#�(  �����<�����  k�������E�����>9h��������A/-2122188634
>
> CPU: 0 PID: -2122188634 Comm: ��E�������������O2� Not tainted 5.0.0-rc1+
> #19
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> ------------[ cut here ]------------
> Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected
> to SLAB object 'task_struct' (offset 1344, size 8)!
> WARNING: CPU: 0 PID: -1455036288 at mm/usercopy.c:78
> usercopy_warn+0xeb/0x110 mm/usercopy.c:78
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: -1455036288 Comm: ��E�������������O2� Not tainted 5.0.0-rc1+
> #19
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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