linux-kernel - Re: [PATCH v2 05/39] x86: Base IBT bits

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Message-ID: <YhlTRhh7qj538ygM@dev-arch.archlinux-ax161>
Date:   Fri, 25 Feb 2022 15:08:06 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        joao@...rdrivepizza.com, hjl.tools@...il.com, jpoimboe@...hat.com,
        andrew.cooper3@...rix.com, linux-kernel@...r.kernel.org,
        ndesaulniers@...gle.com, samitolvanen@...gle.com,
        mark.rutland@....com, alyssa.milburn@...el.com, mbenes@...e.cz,
        rostedt@...dmis.org, mhiramat@...nel.org,
        alexei.starovoitov@...il.com, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 05/39] x86: Base IBT bits

On Thu, Feb 24, 2022 at 05:46:59PM -0700, Nathan Chancellor wrote:
> On Thu, Feb 24, 2022 at 04:35:51PM -0800, Kees Cook wrote:
> > On Thu, Feb 24, 2022 at 03:51:43PM +0100, Peter Zijlstra wrote:
> > > Add Kconfig, Makefile and basic instruction support for x86 IBT.
> > > 
> > > XXX clang is not playing ball, probably lld being 'funny', I'm having
> > > problems with .plt entries appearing all over after linking.
> > 
> > I'll try to look into this; I know you've been chatting with Nathan
> > about it. Is there an open bug for it? (And any kind of reproducer
> > smaller than a 39 patch series we can show the linker folks?) :)
> 
> I should be able to create a reproducer with cvise and file a bug on
> GitHub around this tomorrow, I should have done it after Peter's
> comments on IRC.

https://github.com/ClangBuiltLinux/linux/issues/1606

Cheers,
Nathan