linux-kernel - Re: [PATCH v5 09/15] x86: Use an opaque type for functions not callable from C

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Message-ID: <202110141141.870A67E@keescook>
Date:   Thu, 14 Oct 2021 11:47:01 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>, 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 09/15] x86: Use an opaque type for functions not
 callable from C

On Thu, Oct 14, 2021 at 07:31:26PM +0200, Borislav Petkov wrote:
> On Thu, Oct 14, 2021 at 09:07:57AM -0700, Kees Cook wrote:
> Looking at the changelog, DECLARE_ASM_FUNC_SYMBOL, makes a lot more
> sense to me even if it doesn't specify the aspect that it is not called
> by C but who cares - it is generic enough.

Around we go. :) Josh[1] and Steven[2] explicitly disagreed with
that name, leading to the current name[3]. Do you want it to be
DECLARE_ASM_FUNC_SYMBOL() over those objections?

I'd really like to finish this shed -- I need to take the bikes in from
the rain. :P

-Kees

[1] https://lore.kernel.org/lkml/20211006032945.axlqh3vehgar6adr@treble/
[2] https://lore.kernel.org/lkml/20211006101654.6a5be402@gandalf.local.home/
[3] https://lore.kernel.org/lkml/CABCJKufCaOXOUF43a-PQshO8aEsMNhZ2EiyGMSOp9ZGn57G=pg@mail.gmail.com/

-- 
Kees Cook