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x86, fpu, amd: Clear exceptions in AMD FXSAVE workaround

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Before we do an EMMS in the AMD FXSAVE information leak workaround we
need to clear any pending exceptions, otherwise we trap with a
floating-point exception inside this code.

Reported-by: halfdog <me@halfdog.net>
Tested-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/CA%2B55aFxQnY_PCG_n4=0w-VG=YLXL-yr7oMxyy0WU2gCBAf3ydg@mail.gmail.com
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Linus Torvalds 2014-01-11 19:15:52 -08:00 committed by H. Peter Anvin
parent 1739f09e33
commit 26bef1318a
1 changed files with 7 additions and 6 deletions
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13
arch/x86/include/asm/fpu-internal.h
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@ -293,12 +293,13 @@ static inline int restore_fpu_checking(struct task_struct *tsk)
/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
is pending. Clear the x87 state here by setting it to fixed
values. "m" is a random variable that should be in L1 */
alternative_input(
ASM_NOP8 ASM_NOP2,
"emms\n\t" /* clear stack tags */
"fildl %P[addr]", /* set F?P to defined value */
X86_FEATURE_FXSAVE_LEAK,
[addr] "m" (tsk->thread.fpu.has_fpu));
if (unlikely(static_cpu_has(X86_FEATURE_FXSAVE_LEAK))) {
asm volatile(
"fnclex\n\t"
"emms\n\t"
"fildl %P[addr]" /* set F?P to defined value */
: : [addr] "m" (tsk->thread.fpu.has_fpu));
}
return fpu_restore_checking(&tsk->thread.fpu);
}