linux-kernel - Re: [RFC][PATCH] objtool: WARN about ENDBR instructions

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Message-ID: <YCQRU+b6b6iGGsev@hirez.programming.kicks-ass.net>
Date:   Wed, 10 Feb 2021 18:01:07 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        yu-cheng.yu@...el.com
Subject: Re: [RFC][PATCH] objtool: WARN about ENDBR instructions

On Wed, Feb 10, 2021 at 10:09:45AM -0600, Josh Poimboeuf wrote:
> On Wed, Feb 10, 2021 at 09:39:53AM +0100, Peter Zijlstra wrote:
> > 
> > 
> > Given all the ENDBR fun we recently had, do we want the below? Until
> > someone comes and fixes up kprobes/ftrace/livepatch etc.. having them is
> > a giant pain and we'd better warn about it.
> 
> Meh...
> 
> Is there a point in doing this, now that we killed it with
> -fcf-protection=none?
> 
> That said, the patch is nicely small and localized.

Yeah, paranoia, just making absolutely sure it doesn't sneak back in
unexpected.