x86/fpu: Mask PKRU from kernel XRSTOR[S] operations

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As the PKRU state is managed separately restoring it from the xstate
buffer would be counterproductive as it might either restore a stale
value or reinit the PKRU state to 0.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121456.606745195@linutronix.de

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Thomas Gleixner 2021-06-23 14:02:20 +02:00 • committed by Borislav Petkov

parent e84ba47e31

commit 30a304a138

4 changed files with 14 additions and 3 deletions

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4

arch/x86/include/asm/fpu/internal.h

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10

arch/x86/include/asm/fpu/xstate.h

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1

arch/x86/kernel/fpu/xstate.c

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2

arch/x86/mm/extable.c

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