linux-kernel - Re: [RFC PATCH v2 13/21] treewide: Drop WARN_ON_FUNCTION

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Message-ID: <202205141454.12B573ABC@keescook>
Date:   Sat, 14 May 2022 14:54:46 -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 13/21] treewide: Drop WARN_ON_FUNCTION_MISMATCH

On Fri, May 13, 2022 at 01:21:51PM -0700, Sami Tolvanen wrote:
> CONFIG_CFI_CLANG no longer breaks cross-module function address
> equality, which makes WARN_ON_FUNCTION_MISMATCH unnecessary. Remove
> the definition and switch back to WARN_ON_ONCE.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

This one always felt like a trade-off, so I'm happy to see it go. :)

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

-- 
Kees Cook