linux-kernel - Re: [PATCH v4 00/45] x86: Kernel IBT

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Message-ID: <alpine.LSU.2.21.2203090959150.672@pobox.suse.cz>
Date:   Wed, 9 Mar 2022 13:51:33 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     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,
        keescook@...omium.org, samitolvanen@...gle.com,
        mark.rutland@....com, alyssa.milburn@...el.com,
        rostedt@...dmis.org, mhiramat@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH v4 00/45] x86: Kernel IBT

On Tue, 8 Mar 2022, Peter Zijlstra wrote:

> Hopefully last posting...
> 
> Since last time:
> 
>  - updated the ftrace_location() patch (naveen, rostedt)
>  - added a few comments and clarifications (bpetkov)
>  - disable jump-tables (joao)
>  - verified clang-14-rc2 works
>  - fixed a whole bunch of objtool unreachable insn issue
>  - picked up a few more tags
> 
> Patches go on top of tip/master + arm64/for-next/linkage. Also available here:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt

FWIW objtool changes look good to me. 

I only came across 

arch/x86/kernel/head_64.o: warning: objtool: .noinstr.text: unexpected end of section

with CC_HAS_IBT=n, which you already know about.

CC_HAS_IBT=y compilation gives

vmlinux.o: warning: objtool: xen_vcpu_setup()+0xa3: unreachable instruction

Miroslav