linux-hardening - Re: [PATCH v8 07/14] kallsyms: Hide layout

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Message-ID: <CAMj1kXFLJcfUqEoz0NAb49=XJG=5LAwEPSwCQ-y7sN31C1U6AQ@mail.gmail.com>
Date:   Fri, 3 Dec 2021 11:03:35 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        linux-hardening@...r.kernel.org, X86 ML <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>,
        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>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Marios Pomonis <pomonis@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        live-patching@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v8 07/14] kallsyms: Hide layout

On Fri, 3 Dec 2021 at 11:01, Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Thu, Dec 02, 2021 at 11:32:07PM +0100, Alexander Lobakin wrote:
> > From: Kristen Carlson Accardi <kristen@...ux.intel.com>
> >
> > This patch makes /proc/kallsyms display in a random order, rather
> > than sorted by address in order to hide the newly randomized address
> > layout.
>
> Is there a reason to not always do this? That is, why are we keeping two
> copies of this code around? Less code is more better etc..

+1.

IIRC I made the exact same point when this patch was sent out by
Kristen a while ago.