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da53f60bb8
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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