linux-kernel - Re: [PATCH v3 05/39] x86/ibt: Add ANNOTATE

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Message-ID: <20220304185953.pom5at6roevsmm2w@treble>
Date:   Fri, 4 Mar 2022 10:59:53 -0800
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        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 v3 05/39] x86/ibt: Add ANNOTATE_NOENDBR

On Thu, Mar 03, 2022 at 12:23:26PM +0100, Peter Zijlstra wrote:
> In order to have objtool warn about code references to !ENDBR
> instruction, we need an annotation to allow this for non-control-flow
> instances -- consider text range checks, text patching, or return
> trampolines etc.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> ---
>  include/linux/objtool.h |   16 ++++++++++++++++
>  1 file changed, 16 insertions(+)

Also needs copied over to tools/include/linux/objtool.h to avoid the
sync warning.

-- 
Josh