linux-hardening - Re: [PATCH 09/15] x86/alternatives: Use C int3 selftest but disable KASAN

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Message-ID: <YH6AaBY5A+x2pmqI@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Apr 2021 09:19:04 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     X86 ML <x86@...nel.org>, Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        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>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH 09/15] x86/alternatives: Use C int3 selftest but disable
 KASAN

On Mon, Apr 19, 2021 at 08:26:36AM -0700, Sami Tolvanen wrote:
> On Sat, Apr 17, 2021 at 4:37 AM Peter Zijlstra <peterz@...radead.org> wrote:

> > The problem is that the call-site does not respect the regular calling
> > convention, so calling a regular C function is just asking for trouble,
> > which is why it ended up being asm, then we fully control the calling
> > convention.
> 
> Ack. The problem here is that we can't declare an extern static
> function in C. How would you feel about making int3_magic a global
> instead to match the C declaration?

Works for me.