Just a heads-up to the x86 people: I'm going to merge this directly,
since I'm doing -rc1 momentarily, and without this patch 32-bit
user-land on a 64-bit kernel is flaky on all AMD CPU's. Which I don't
want for -rc1.
Linus
On Sun, Apr 26, 2015 at 4:47 PM, Andy Lutomirski <l...@kernel.org> wrote:
> AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET
> with SS == 0 results in an invalid usermode state in which SS is
> apparently equal to __USER_DS but causes #SS if used.
>
> Work around the issue by setting SS to __KERNEL_DS __switch_to, thus
> ensuring that SYSRET never happens with SS set to NULL.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
