Re: [RFC PATCH v2 10/21] arm64: Add CFI error handling

Kees Cook
2022-05-14T21:51:56Z

On Fri, May 13, 2022 at 01:21:48PM -0700, Sami Tolvanen wrote:
> With -fsanitize=kcfi, CFI always traps. Add arm64 support for handling
> CFI failures. The registers containing the target address and the
> expected type are encoded in the first ten bits of the ESR as follows:
>
> - 0-4: n, where the register Xn contains the target address
> - 5-9: m, where the register Wm contains the type hash
>
> Suggested-by: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

It might be nice just to include an example exception Oops in this
commit log.

Reviewed-by: Kees Cook <keescook@chromium.org>

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Kees Cook