linux-hardening - Re: [PATCH v8 05/14] x86: conditionally place regular ASM functions into separate sections

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Message-ID: <2onsnq80-p1s8-00-roo9-n02q74319ro@syhkavp.arg>
Date:   Fri, 10 Dec 2021 08:20:47 -0500 (EST)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-hardening@...r.kernel.org, x86@...nel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Bruce Schlobohm <bruce.schlobohm@...el.com>,
        Jessica Yu <jeyu@...nel.org>,
        kernel test robot <lkp@...el.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Evgenii Shatokhin <eshatokhin@...tuozzo.com>,
        Jonathan Corbet <corbet@....net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
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        Masami Hiramatsu <mhiramat@...nel.org>,
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        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arch@...r.kernel.org, live-patching@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v8 05/14] x86: conditionally place regular ASM functions
 into separate sections

On Fri, 10 Dec 2021, Alexander Lobakin wrote:

> I could do unconditional
> 
> .pushsection %S.##name
>                 ^^^^^^ function name
> 
> but this would involve changing LDS scripts (and vmlinux.lds.h) to
> let's say replace *(.noinstr.text) with *(.noinstr.text*).

Yes, this is meant to be used with a linker script that expects the new 
name.


Nicolas