linux-kernel - Re: [PATCH v2 16/39] x86/bpf: Add ENDBR instructions to prologue and trampoline

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Message-ID: <202202241658.49BC109@keescook>
Date:   Thu, 24 Feb 2022 16:59:29 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, samitolvanen@...gle.com,
        mark.rutland@....com, alyssa.milburn@...el.com, mbenes@...e.cz,
        rostedt@...dmis.org, mhiramat@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH v2 16/39] x86/bpf: Add ENDBR instructions to prologue and
 trampoline

On Thu, Feb 24, 2022 at 03:37:31PM -0800, Josh Poimboeuf wrote:
> All the "4*HAS_KERNEL_IBT" everywhere is cute, but you might as well
> just have IBT_ENDBR_SIZE (here and in other patches).

Oops, I should have read ahead. Yeah, I like folding the multiplication
into the macro...

-- 
Kees Cook