linux-hardening - Re: [PATCH v5 12/15] x86, module: Ignore __typeid_

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Message-ID: <202110131155.3A730AB3@keescook>
Date:   Wed, 13 Oct 2021 11:55:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v5 12/15] x86, module: Ignore __typeid__ relocations

On Wed, Oct 13, 2021 at 11:16:55AM -0700, Sami Tolvanen wrote:
> The R_X86_64_8 __typeid__* relocations are for constants the compiler
> generates for indirect call type checking with CONFIG_CFI_CLANG. Ignore
> them when loading modules.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

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

-- 
Kees Cook