x86/mm/kmmio: Make the tracer robust against L1TF

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The mmio tracer sets io mapping PTEs and PMDs to non present when enabled
without inverting the address bits, which makes the PTE entry vulnerable
for L1TF.

Make it use the right low level macros to actually invert the address bits
to protect against L1TF.

In principle this could be avoided because MMIO tracing is not likely to be
enabled on production machines, but the fix is straigt forward and for
consistency sake it's better to get rid of the open coded PTE manipulation.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Andi Kleen 2018-08-07 15:09:38 -07:00 • committed by Thomas Gleixner

parent 958f79b9ee

commit 1063711b57

1 changed files with 15 additions and 10 deletions

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arch/x86/mm/kmmio.c

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