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

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Date:   Wed, 11 Nov 2020 12:09:54 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+2667188e965125ab6e7a@...kaller.appspotmail.com>
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Anant Thazhemadam <anant.thazhemadam@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Borislav Petkov <bp@...en8.de>, chang.seok.bae@...el.com,
        Dan Carpenter <dan.carpenter@...cle.com>,
        George Kennedy <george.kennedy@...cle.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Sasha Levin <sashal@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: KASAN: out-of-bounds Read in __switch_to (2)

On Thu, Oct 29, 2020 at 3:10 PM syzbot
<syzbot+2667188e965125ab6e7a@...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=174684b8500000
> start commit:   fb0155a0 Merge tag 'nfs-for-5.9-3' of git://git.linux-nfs...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=41b736b7ce1b3ea4
> dashboard link: https://syzkaller.appspot.com/bug?extid=2667188e965125ab6e7a
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11743a37900000
>
> 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

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