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

Sami Tolvanen
2022-05-16T16:25:27Z

On Sat, May 14, 2022 at 2:51 PM Kees Cook <keescook@chromium.org> wrote:
>
> 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.

Agreed, I'll add an example.

Sami