linux-kernel - Re: [PATCH v2 00/39] x86: Kernel IBT

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Message-ID: <20220225123238.5ceeaae1@gandalf.local.home>
Date:   Fri, 25 Feb 2022 12:32:38 -0500
From:   Steven Rostedt <rostedt@...dmis.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, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, mhiramat@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH v2 00/39] x86: Kernel IBT

On Fri, 25 Feb 2022 09:26:44 -0800
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> > Damn, I just realized this makes KERNEL_IBT hard depend on KALLSYMS :-(  
> 
> Why should the jump label patching code even care whether there's an
> ENDBR at the jump target?  It should never jump to the beginning of a
> function anyway, right?  And objtool presumably doesn't patch out ENDBRs
> in the middle of a function.

Perhaps Peter confused jump labels with static calls?

-- Steve