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(parent: 1739f09) | patch
x86, fpu, amd: Clear exceptions in AMD FXSAVE workaround
authorLinus Torvalds <torvalds@linux-foundation.org>
Sun, 12 Jan 2014 03:15:52 +0000 (19:15 -0800)
committerH. Peter Anvin <hpa@zytor.com>
Sun, 12 Jan 2014 03:15:52 +0000 (19:15 -0800)
commit26bef1318adc1b3a530ecc807ef99346db2aa8b0
treed7fe46fa037ee060ce9fced2ccc5014d5552f6eatree | snapshot
parent1739f09e33d8f66bf48ddbc3eca615574da6c4f6commit | diff
x86, fpu, amd: Clear exceptions in AMD FXSAVE workaround

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>
arch/x86/include/asm/fpu-internal.h diff | blob | history
Domain: System / Uncategorized;