linux-hardening - Re: [PATCH v4 01/15] objtool: Add CONFIG_CFI

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Date:   Wed, 6 Oct 2021 09:18:38 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     X86 ML <x86@...nel.org>, Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, llvm@...ts.linux.dev
Subject: Re: [PATCH v4 01/15] objtool: Add CONFIG_CFI_CLANG support

On Tue, Oct 5, 2021 at 8:36 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> On Thu, Sep 30, 2021 at 11:05:17AM -0700, Sami Tolvanen wrote:
> > With CONFIG_CFI_CLANG, the compiler replaces function references with
> > references to the CFI jump table, which confuses objtool. This change,
> > based on Josh's initial patch [1], goes through the list of relocations
> > and replaces jump table symbols with the actual function symbols.
> >
> > [1] https://lore.kernel.org/r/d743f4b36e120c06506567a9f87a062ae03da47f.1611263462.git.jpoimboe@redhat.com/
>
> I found the original patch description to be much more useful than this
> one ;-)

Sure, I'll just copy that for the next version.

Sami