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Date:   Sat, 14 May 2022 14:51:47 -0700
From:   Kees Cook <>
To:     Sami Tolvanen <>
Cc:, Josh Poimboeuf <>,
        Peter Zijlstra <>,,
        Catalin Marinas <>,
        Will Deacon <>,
        Mark Rutland <>,
        Nathan Chancellor <>,
        Nick Desaulniers <>,
        Joao Moreira <>,
        Sedat Dilek <>,
        Steven Rostedt <>,,,
Subject: Re: [RFC PATCH v2 10/21] arm64: Add CFI error handling

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 <>
> Signed-off-by: Sami Tolvanen <>

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

Reviewed-by: Kees Cook <>

Kees Cook

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