linux-hardening - Re: [PATCH] x86: Allow for exclusions in checking RETHUNK

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Message-ID: <Ys/DNIyc+4ju7Qmb@worktop.programming.kicks-ass.net>
Date:   Thu, 14 Jul 2022 09:18:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        kernel test robot <oliver.sang@...el.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] x86: Allow for exclusions in checking RETHUNK

On Wed, Jul 13, 2022 at 04:55:56PM -0700, Josh Poimboeuf wrote:
> Here's the ANNOTATE_UNSAFE_RET idea.

Right, I suppose that strictly speaking the compiler can do whatever and
there's no actual guarantee the annotation hits the RET instruction, in
practise it should work, esp. since noinstr.

> Most of the diff is moving the
> annotation macros to objtool.h (where they belong anyway).

Yeah, moving those is a good idea.