linux-kernel - Re: [PATCH 15/29] x86: Disable IBT around firmware

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Message-ID: <YhO5i+DmY1+/l+PC@hirez.programming.kicks-ass.net>
Date:   Mon, 21 Feb 2022 17:10:51 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com,
        linux-kernel@...r.kernel.org, ndesaulniers@...gle.com,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com
Subject: Re: [PATCH 15/29] x86: Disable IBT around firmware

On Mon, Feb 21, 2022 at 07:54:55AM -0800, Kees Cook wrote:
> A small bike shed: should __noendbr have an alias, like
> __never_indirect or something, so there is an arch-agnostic way to do
> this that actually says what it does? (yes, it's in x86-only code now,
> hence the bike shed...)

I actually asked Mark a related question last week somewhere, I think
the answer was that the annotation either wasn't working or not as
useful on ARM64.

I'm thinking it's easy enough to do a mass rename if/when we cross that
bridge though.