linux-kernel - Re: general protection fault in syscall_return

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Date:   Sat, 15 Aug 2020 03:18:05 -0700
From:   syzbot <syzbot+cd66e43794b178bb5cd6@...kaller.appspotmail.com>
To:     bp@...en8.de, dan.carpenter@...cle.com, daniel.vetter@...ll.ch,
        dvyukov@...gle.com, gregkh@...uxfoundation.org, hpa@...or.com,
        jannh@...gle.com, linux-kernel@...r.kernel.org, luto@...nel.org,
        mingo@...hat.com, natechancellor@...il.com,
        penguin-kernel@...ove.SAKURA.ne.jp,
        penguin-kernel@...ove.sakura.ne.jp,
        syzkaller-bugs@...glegroups.com, syzkaller@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: general protection fault in syscall_return_slowpath

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=13f979f6900000
start commit:   63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
dashboard link: https://syzkaller.appspot.com/bug?extid=cd66e43794b178bb5cd6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a42329e00000

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