linux-kernel - Re: KASAN: out-of-bounds Read in pebs_update

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Message-ID: <0000000000008eef2f05acf006f8@google.com>
Date:   Sat, 15 Aug 2020 13:03:05 -0700
From:   syzbot <syzbot+45862e7027be5d590577@...kaller.appspotmail.com>
To:     acme@...nel.org, alexander.shishkin@...ux.intel.com, bp@...en8.de,
        daniel.vetter@...ll.ch, gregkh@...uxfoundation.org, hpa@...or.com,
        jolsa@...hat.com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, namhyung@...nel.org,
        penguin-kernel@...ove.SAKURA.ne.jp,
        penguin-kernel@...ove.sakura.ne.jp, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: KASAN: out-of-bounds Read in pebs_update_state

syzbot suspects this issue was fixed by commit:

commit 033724d6864245a11f8e04c066002e6ad22b3fd0
Author: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Date:   Wed Jul 15 01:51:02 2020 +0000

    fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12ed4181900000
start commit:   e99332e7 gcc-10: mark more functions __init to avoid secti..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=8a96cf498e199d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=45862e7027be5d590577
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17bb1714100000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.

For information about bisection process see: https://goo.gl/tpsmEJ#bisection