linux-hardening - Re: [PATCH 07/17] kallsyms: cfi: strip hashes from static functions

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Message-ID: <202103111843.008B935F8@keescook>
Date:   Thu, 11 Mar 2021 18:45:09 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Tejun Heo <tj@...nel.org>,
        bpf@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kbuild@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/17] kallsyms: cfi: strip hashes from static functions

On Thu, Mar 11, 2021 at 04:49:09PM -0800, Sami Tolvanen wrote:
> With CONFIG_CFI_CLANG and ThinLTO, Clang appends a hash to the names
> of all static functions not marked __used. This can break userspace
> tools that don't expect the function name to change, so strip out the
> hash from the output.
> 
> Suggested-by: Jack Pham <jackp@...eaurora.org>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

(Is it possible we could end up with symbol name collisions? ... though
I guess we would have had collisions before?)

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

-- 
Kees Cook