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

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Date:   Wed, 04 Dec 2019 13:41:01 -0800
From:   syzbot <syzbot+4455ca3b3291de891abc@...kaller.appspotmail.com>
To:     aryabinin@...tuozzo.com, b.zolnierkie@...sung.com,
        daniel.thompson@...aro.org, daniel.vetter@...ll.ch,
        dri-devel@...ts.freedesktop.org, dvyukov@...gle.com,
        ghalat@...hat.com, gleb@...nel.org, gwshan@...ux.vnet.ibm.com,
        hpa@...or.com, jmorris@...ei.org, kasan-dev@...glegroups.com,
        kvm@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        maarten.lankhorst@...ux.intel.com, mingo@...hat.com,
        mpe@...erman.id.au, pbonzini@...hat.com,
        penguin-kernel@...ove.sakura.ne.jp, ruscur@...sell.cc,
        sam@...nborg.org, serge@...lyn.com, stewart@...ux.vnet.ibm.com,
        syzkaller-bugs@...glegroups.com, takedakn@...data.co.jp,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: KASAN: slab-out-of-bounds Read in fbcon_get_font

syzbot has bisected this bug to:

commit 2de50e9674fc4ca3c6174b04477f69eb26b4ee31
Author: Russell Currey <ruscur@...sell.cc>
Date:   Mon Feb 8 04:08:20 2016 +0000

     powerpc/powernv: Remove support for p5ioc2

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=127a042ae00000
start commit:   76bb8b05 Merge tag 'kbuild-v5.5' of git://git.kernel.org/p..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=117a042ae00000
console output: https://syzkaller.appspot.com/x/log.txt?x=167a042ae00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dd226651cb0f364b
dashboard link: https://syzkaller.appspot.com/bug?extid=4455ca3b3291de891abc
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11181edae00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105cbb7ae00000

Reported-by: syzbot+4455ca3b3291de891abc@...kaller.appspotmail.com
Fixes: 2de50e9674fc ("powerpc/powernv: Remove support for p5ioc2")

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