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6164331d15
xfpregs_set() was incomprehensible. Almost all of the complexity was due to trying to support nonsensically sized writes or -EFAULT errors that would have partially or completely overwritten the destination before failing. Nonsensically sized input would only have been possible using PTRACE_SETREGSET on REGSET_XFP. Fortunately, it appears (based on Debian code search results) that no one uses that API at all, let alone with the wrong sized buffer. Failed user access can be handled more cleanly by first copying to kernel memory. Just rewrite it to require sensible input. 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/20210623121452.504234607@linutronix.de |
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