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

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Message-ID: <202205141451.AABEE8B@keescook>
Date:   Sat, 14 May 2022 14:51:47 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Joao Moreira <joao@...rdrivepizza.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
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 <mark.rutland@....com>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

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

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

-- 
Kees Cook