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From: Dmitry Vyukov <dvyukov@google.com>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	syzbot <syzbot+2c73319c406f1987d156@syzkaller.appspotmail.com>,
	Alexei Starovoitov <ast@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	Daniel Borkmann <daniel@iogearbox.net>
Subject: Re: bpf-next boot error: KASAN: use-after-free Write in call_usermodehelper_exec_work
Date: Thu, 7 Jun 2018 20:32:27 +0200	[thread overview]
Message-ID: <CACT4Y+ZzSfCvYaGwbz2Y_5DfpeBOfm621is_hQWik119VGOERg@mail.gmail.com> (raw)
In-Reply-To: <20180607181222.GD5527@wotan.suse.de>

On Thu, Jun 7, 2018 at 8:12 PM, Luis R. Rodriguez <mcgrof@kernel.org> wrote:
>> > <syzbot+2c73319c406f1987d156@syzkaller.appspotmail.com> wrote:
>> > > Hello,
>> > >
>> > > syzbot found the following crash on:
>> > >
>> > > HEAD commit:    69b450789136 Merge branch 'misc-BPF-improvements'
>> > > git tree:       bpf-next
>> > > console output: https://syzkaller.appspot.com/x/log.txt?x=1080d1d7800000
>> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=e4078980b886800c
>> > > dashboard link: https://syzkaller.appspot.com/bug?extid=2c73319c406f1987d156
>> > > compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
>> > >
>> > > 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+2c73319c406f1987d156@syzkaller.appspotmail.com
>> >
>> >
>> > This crash now happens on every other boot of mainline tree. This
>> > prevents syzbot testing of new code, and just boots machine with
>> > corrupted memory. Were there any recent changes in umh? +Alexei, you
>> > seem to touch it last. Could your change cause this?
>>
>> looking into it. I think I see the issue. Trying to reproduce.
>
> And this is why a test driver would be useful ;)

And also testing everything with KASAN and LOCKDEP ;)

      reply	other threads:[~2018-06-07 18:33 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-04 20:21 syzbot
2018-06-07 12:19 ` Dmitry Vyukov
2018-06-07 16:07   ` Alexei Starovoitov
2018-06-07 18:12     ` Luis R. Rodriguez
2018-06-07 18:32       ` Dmitry Vyukov [this message]

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