[PATCH] arm64: Support Clang UBSAN trap codes for better reporting

[John Stultz]

On Thu, Feb 2, 2023 at 2:37 PM Kees Cook <keescook at chromium.org> wrote:
>
> On arm64, Clang encodes the UBSAN check type in the esr. Extract this
> and actually report UBSAN traps with some specificity when building with
> CONFIG_UBSAN_TRAP. Before:
>
>   Internal error: BRK handler: 00000000f20003e8 [#1] PREEMPT SMP
>
> After:
>
>   Internal error: UBSAN: shift out of bounds: 00000000f2005514 [#1] PREEMPT SMP
>

This is really great ! When I brought up the opaque error messages
just a few hours ago, I didn't imagine you'd have a solution so
quickly!

I really appreciate your lightning fast effort here!

Really, thanks so much! I think this will have a big impact for folks
running into these new bug catchers.
-john