linux-kernel - Re: qemu-system-x86_64: mov_ss_trap_64 PANIC: double fault, error

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Date:   Tue, 26 Jun 2018 11:06:43 -0600
From:   Dan Rue <dan.rue@...aro.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Borislav Petkov <bp@...en8.de>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>, rafael.tinoco@...aro.org,
        Shuah Khan <shuah@...nel.org>, Ingo Molnar <mingo@...nel.org>
Subject: Re: qemu-system-x86_64: mov_ss_trap_64 PANIC: double fault,
 error_code: 0x0

On Mon, Jun 25, 2018 at 08:47:40AM -0700, Andy Lutomirski wrote:
> On Sun, Jun 24, 2018 at 10:41 PM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> >
> > Kselftest test case mov_ss_trap_64 is causing kernel panic on
> > qemu-system-x86_64 and PASS on real x86_64 hardware.
> >
> > Test code snippet,
> > main() {
> > <>
> >       printf("[RUN]\tMOV SS; CS CS INT3\n");
> >       asm volatile ("mov %[ss], %%ss; .byte 0x2e, 0x2e; int3" :: [ss] "m" (ss));
> > <>
> > }
> >
> 
> This smells like CVE-2018-1087.  Can you confirm that your *host*
> kernel is patched?
> 
> CVE-2018-1087 is extremely severe, and if your host kernel is not
> patched, I think you need to apply some serious pressure on your
> vendor to get with the program.

Thanks Andy - that was exactly it. We updated our host running debian
stretch to the latest kernel (per
https://security-tracker.debian.org/tracker/CVE-2018-1087), and the
symptom was no longer seen. Thanks for the pointer.

Dan

-- 
Linux Kernel Functional Testing (LKFT)
https://lkft.linaro.org/