Re: qemu-system-x86_64: mov_ss_trap_64 PANIC: double fault, error_code: 0x0

[Andy Lutomirski]

On Sun, Jun 24, 2018 at 10:41 PM Naresh Kamboju
<naresh.kamboju@xxxxxxxxxx> 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