linux-kernel - Re: KASAN: unknown-crash Read in do

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Date:   Tue, 20 Oct 2020 08:11:33 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+d9ae84069cff753e94bf@...kaller.appspotmail.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Christian Brauner <christian@...uner.io>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        George Kennedy <george.kennedy@...cle.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Sandeen <sandeen@...deen.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: KASAN: unknown-crash Read in do_exit

On Mon, Oct 19, 2020 at 11:38 PM syzbot
<syzbot+d9ae84069cff753e94bf@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a49145acfb975d921464b84fe00279f99827d816
> Author: George Kennedy <george.kennedy@...cle.com>
> Date:   Tue Jul 7 19:26:03 2020 +0000
>
>     fbmem: add margin check to fb_check_caps()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17ce19c8500000
> start commit:   729e3d09 Merge tag 'ceph-for-5.9-rc5' of git://github.com/..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c61610091f4ca8c4
> dashboard link: https://syzkaller.appspot.com/bug?extid=d9ae84069cff753e94bf
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10642545900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=141f2bed900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: fbmem: add margin check to fb_check_caps()
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Based on the reproducer it looks reasonable:

#syz fix: fbmem: add margin check to fb_check_caps()