linux-kernel - Re: general protection fault in tss_update_io

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Message-ID: <20191121110115.GC6540@zn.tnic>
Date:   Thu, 21 Nov 2019 12:01:15 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     syzbot <syzbot+81e6ff9d4cdb05fd4f5e@...kaller.appspotmail.com>
Cc:     adobriyan@...il.com, ak@...ux.intel.com, bigeasy@...utronix.de,
        fenghua.yu@...el.com, frederic@...nel.org, hpa@...or.com,
        keescook@...omium.org, 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 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

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette