x86/fpu: Clean up fpregs_set()

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fpregs_set() has unnecessary complexity to support short or nonzero-offset
writes and to handle the case in which a copy from userspace overwrites
some of the target buffer and then fails.  Support for partial writes is
useless -- just require that the write has offset 0 and the correct size,
and copy into a temporary kernel buffer to avoid clobbering the state if
the user access fails.

Signed-off-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/20210623121452.710467587@linutronix.de

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Andy Lutomirski 2021-06-23 14:01:41 +02:00 • committed by Borislav Petkov

parent 145e9e0d8c

commit da53f60bb8

1 changed files with 16 additions and 15 deletions

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arch/x86/kernel/fpu/regset.c

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