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

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Message-ID: <CALCETrWZ=sipwoVic16LM08+-FKV5knO7Cv3pSM_5w=KLCqTKw@mail.gmail.com>
Date:   Mon, 25 Jun 2018 08:47:40 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Andrew Lutomirski <luto@...nel.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 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.

--Andy