x86/fpu: Reject invalid MXCSR values in copy_kernel_to_xstate()

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Instead of masking out reserved bits, check them and reject the provided
state as invalid if not zero.

Suggested-by: Andy Lutomirski <luto@kernel.org>
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/20210623121452.308388343@linutronix.de

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Thomas Gleixner 2021-06-23 14:01:37 +02:00 • committed by Borislav Petkov

parent 43be46e896

commit 947f4947cf

1 changed files with 16 additions and 3 deletions

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arch/x86/kernel/fpu/xstate.c

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