linux-kernel - Re: general protection fault in tss_update_io

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Message-ID: <201911210931.DB5346C8@keescook>
Date:   Thu, 21 Nov 2019 09:36:14 -0800
From:   Kees Cook <keescook@...omium.org>
To:     syzbot <syzbot+81e6ff9d4cdb05fd4f5e@...kaller.appspotmail.com>
Cc:     Borislav Petkov <bp@...en8.de>, adobriyan@...il.com,
        ak@...ux.intel.com, bigeasy@...utronix.de, fenghua.yu@...el.com,
        frederic@...nel.org, hpa@...or.com, kernelfans@...il.com,
        len.brown@...el.com, linux-kernel@...r.kernel.org,
        longman@...hat.com, luto@...nel.org, mingo@...hat.com,
        peterz@...radead.org, rafael.j.wysocki@...el.com, riel@...riel.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        tim.c.chen@...ux.intel.com, tonywwang-oc@...oxin.com,
        wang.yi59@....com.cn, x86@...nel.org
Subject: Re: general protection fault in tss_update_io_bitmap

On Thu, Nov 21, 2019 at 12:01:15PM +0100, Borislav Petkov wrote:
> On Wed, Nov 20, 2019 at 05:55:09PM -0800, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following crash on:
> > 
> > HEAD commit:    5d1131b4 Add linux-next specific files for 20191119
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=177979d2e00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=b60c562d89e5a8df
> > dashboard link: https://syzkaller.appspot.com/bug?extid=81e6ff9d4cdb05fd4f5e
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1549ed8ce00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17f91012e00000
> > 
> > The bug was bisected to:
> > 
> > commit 111e7b15cf10f6e973ccf537c70c66a5de539060
> > Author: Thomas Gleixner <tglx@...utronix.de>
> > Date:   Tue Nov 12 20:40:33 2019 +0000
> > 
> >     x86/ioperm: Extend IOPL config to control ioperm() as well
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10490e86e00000
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=12490e86e00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14490e86e00000
> 
> Try this:
> 
> https://git.kernel.org/tip/e3cb0c7102f04c83bf1a7cb1d052e92749310b46

Rewording so syzbot can see it (https://goo.gl/tpsmEJ#testing-patches) ...

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git e3cb0c7102f04c83bf1a7cb1d052e92749310b46

-- 
Kees Cook