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Message-ID: <20220414170550.v2jmdfhmz7zbuug6@treble>
Date: Thu, 14 Apr 2022 10:05:50 -0700
From: Josh Poimboeuf <jpoimboe@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
Miroslav Benes <mbenes@...e.cz>
Subject: Re: [PATCH 10/18] objtool: Extricate ibt from stack validation
On Thu, Apr 14, 2022 at 06:38:16PM +0200, Peter Zijlstra wrote:
> On Thu, Apr 14, 2022 at 08:44:49AM -0700, Josh Poimboeuf wrote:
>
> > Ok. That was subtle, it needs a comment or two. I had the distinct
> > feeling I was introducing a bug, then I got distracted ;-)
>
> Right, lemme try and not forget to write one ;-)
I'm rewriting the code anyway, I'll add some comments.
> > Doesn't the compiler give those special cases ENDBR anyway? Just
> > wondering why we avoid the warning for those.
>
> Sure, but this is about not scribbling that ENDBR with a NOP.
Right, but it only prints warnings for data sections, despite marking
others:
- dest = validate_ibt_reloc(file, reloc);
- if (is_data && dest && !dest->noendbr)
- warn_noendbr("data ", sec, reloc->offset, dest);
--
Josh
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