linux-kernel - Re: KASAN: slab-out-of-bounds Read in hfa384x_usbin

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Message-ID: <CACT4Y+bFYVk_6L7pKY7YvzFjNuqRFmSQU5YoCxWMM4is5ofjBA@mail.gmail.com>
Date:   Fri, 8 May 2020 15:51:02 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Cc:     Oliver Neukum <oneukum@...e.com>,
        syzbot <syzbot+7d42d68643a35f71ac8a@...kaller.appspotmail.com>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>, nishkadg.linux@...il.com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: slab-out-of-bounds Read in hfa384x_usbin_callback

On Fri, May 8, 2020 at 12:31 PM Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > On Thu, May 7, 2020 at 5:56 PM 'Andrey Konovalov' via syzkaller-bugs
> > <syzkaller-bugs@...glegroups.com> wrote:
> > >
> > > On Wed, May 6, 2020 at 1:50 PM Andrey Konovalov <andreyknvl@...gle.com> wrote:
> > > >
> > > > On Wed, May 6, 2020 at 10:54 AM Oliver Neukum <oneukum@...e.com> wrote:
> > > > >
> > > > > Am Freitag, den 20.03.2020, 12:28 -0700 schrieb syzbot:
> > > > > > Hello,
> > > > > >
> > > > > > syzbot found the following crash on:
> > > > > >
> > > > > > HEAD commit:    e17994d1 usb: core: kcov: collect coverage from usb comple..
> > > > > > git tree:       https://github.com/google/kasan.git usb-fuzzer
> > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=11d74573e00000
> > > > > > kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
> > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=7d42d68643a35f71ac8a
> > > > > > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > > > > > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15fa561de00000
> > > > > > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15d74573e00000
> > > > > >
> > > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > > > > Reported-by: syzbot+7d42d68643a35f71ac8a@...kaller.appspotmail.com
> > > > > >
> > > > >
> > > > > Hi,
> > > > >
> > > > > is this bug still active and can a test be run on it? I requested one
> > > > > yesterday. If my analysis is correct this bug has security
> > > > > implications, so it is kind of important.
> > > >
> > > > I see your request in the queue and it's been registered and
> > > > completed, but for some reason syzbot didn't send an email with a
> > > > response.
> > > >
> > > > Let me try this once again:
> > > >
> > > > #syz test: https://github.com/google/kasan.git e17994d1
> > >
> > > Still no response. Dmitry, any idea what could be wrong here?
> >
> > I suspect it has something to do with the fact that the bug is already
> > fixed (has a fixing commit).
> >
> > ...right, it was broken by:
> > https://github.com/google/syzkaller/commit/f8368f999a1964df6d39a225cd3f5ab3942dd755
> > and we lack a test for this scenario. It was supposed to only disable
> > mailing of bisection jobs.
>
> Fixed in https://github.com/google/syzkaller/commit/2b98fdbcbcac6e99d12c88857406ef446bcac872
> and added a test to fix this behavior for future.
> Thanks for the report.

syzbot dashboard will now also show patch testing requests on the bug
page for better transparency, see e.g. for this bug:
https://syzkaller.appspot.com/bug?id=093ce698cf84160a66868dcac5394e105342f8c5#jobs

FTR, implemented in:
https://github.com/google/syzkaller/commit/e97b06d3cef9296e9d0e827c42bccdd36b555986