x86: Implement thread_struct whitelist for hardened usercopy

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This whitelists the FPU register state portion of the thread_struct for
copying to userspace, instead of the default entire struct. This is needed
because FPU register state is dynamically sized, so it doesn't bypass the
hardened usercopy checks.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Rik van Riel <riel@redhat.com>

...

This commit is contained in:

Kees Cook 2017-08-16 13:26:03 -07:00

parent 5905429ad8

commit f7d83c1cf3

2 changed files with 9 additions and 0 deletions

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1

arch/x86/Kconfig

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8

arch/x86/include/asm/processor.h

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