linux-kernel - Re: [RFC][PATCH 6/6] objtool: Add IBT validation / fixups

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Message-ID: <a599d509-8995-0eb6-65a1-5d8505e4851e@citrix.com>
Date:   Wed, 16 Feb 2022 00:57:47 +0000
From:   Andrew Cooper <Andrew.Cooper3@...rix.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Joao Moreira <joao@...rdrivepizza.com>
CC:     Kees Cook <keescook@...omium.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "hjl.tools@...il.com" <hjl.tools@...il.com>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>,
        "samitolvanen@...gle.com" <samitolvanen@...gle.com>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [RFC][PATCH 6/6] objtool: Add IBT validation / fixups

On 11/02/2022 13:38, Peter Zijlstra wrote:
> Now, this setup provides:
>
>  - minimal size (please yell if there's a smaller option I missed;
>    s/ud2/int3/ ?)

It's probably best not to overload int3.  #BP is already has magic
properties, and what happens if someone wants to breakpoint one of these?

I'll make my usual into suggestion for 64bit builds.

ud2 is the sensible approach, with a caveat that whatever is hiding here
should have metadata.

~Andrew