linux-hardening - Re: [PATCH v4 11/15] x86, relocs: Ignore __typeid_

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Date:   Wed, 6 Oct 2021 09:17:52 -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 11/15] x86, relocs: Ignore __typeid__ relocations

On Tue, Oct 5, 2021 at 8:31 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
>
> On Thu, Sep 30, 2021 at 11:05:27AM -0700, Sami Tolvanen wrote:
> > From: Kees Cook <keescook@...omium.org>
> >
> > The __typeid__* symbols aren't actually relocations, so they can be
> > ignored during relocation generation.
>
> Then what are they?  It would be good to add that information here.

These relocations are for compiler-generated constants that it uses
for indirect call type checking. I think we can clarify this in the
next version.

Sami