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From: Miroslav Benes <mbenes@suse.cz>
To: "Fāng-ruì Sòng" <maskray@google.com>
Cc: Alexander Lobakin <alexandr.lobakin@intel.com>,
	Borislav Petkov <bp@alien8.de>,
	linux-hardening@vger.kernel.org, x86@kernel.org,
	Jesse Brandeburg <jesse.brandeburg@intel.com>,
	Kristen Carlson Accardi <kristen@linux.intel.com>,
	Kees Cook <keescook@chromium.org>,
	Miklos Szeredi <miklos@szeredi.hu>,
	Ard Biesheuvel <ardb@kernel.org>, Tony Luck <tony.luck@intel.com>,
	Bruce Schlobohm <bruce.schlobohm@intel.com>,
	Jessica Yu <jeyu@kernel.org>, kernel test robot <lkp@intel.com>,
	Evgenii Shatokhin <eshatokhin@virtuozzo.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Michal Marek <michal.lkml@markovi.net>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"David S. Miller" <davem@davemloft.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Marios Pomonis <pomonis@google.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	"H.J. Lu" <hjl.tools@gmail.com>, Nicolas Pitre <nico@fluxnic.net>,
	linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org,
	linux-arch@vger.kernel.org, live-patching@vger.kernel.org,
	llvm@lists.linux.dev
Subject: Re: [PATCH v9 02/15] livepatch: use `-z unique-symbol` if available to nuke pos-based search
Date: Mon, 3 Jan 2022 14:55:42 +0100 (CET)	[thread overview]
Message-ID: <alpine.LSU.2.21.2201031447140.15051@pobox.suse.cz> (raw)
In-Reply-To: <CAFP8O3K1mkiCGMTEeuSifZtr2piHsKTjP5TOA25nqpv2SrbzYQ@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 1216 bytes --]

On Thu, 30 Dec 2021, Fāng-ruì Sòng wrote:

> On Thu, Dec 30, 2021 at 3:11 AM Borislav Petkov <bp@alien8.de> wrote:
> >
> > On Thu, Dec 23, 2021 at 01:21:56AM +0100, Alexander Lobakin wrote:
> > > [PATCH v9 02/15] livepatch: use `-z unique-symbol` if available to nuke pos-based search

...

> Apologies since I haven't read the patch series.
> 
> The option does not exist in ld.lld and I am a bit concerning about
> its semantics: https://maskray.me/blog/2020-11-15-explain-gnu-linker-options#z-unique-symbol
> 
> I thought that someone forwarded my comments (originally posted months
> on a feature request ago) here but seems not.
> (I am a ld.lld maintainer.)

Do you mean 
https://lore.kernel.org/all/20210123225928.z5hkmaw6qjs2gu5g@google.com/T/#u 
?

Unfortunately, it did not lead anywhere. I think that '-z unique-symbol' 
option should work fine as long as the live patching is concerned. Maybe I 
misunderstood but your concerns mentioned at the blog do not apply. The 
stability is not an issue for us since we (KLP) always work with already 
built and fixed kernel. And(at least) GCC already uses number suffices for 
IPA clones and it has not been a problem anywhere.

Am I wrong?

Thanks

Miroslav 

  reply	other threads:[~2022-01-03 13:55 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-23  0:21 [PATCH v9 00/15] Function Granular KASLR Alexander Lobakin
2021-12-23  0:21 ` [PATCH v9 01/15] modpost: fix removing numeric suffixes Alexander Lobakin
2021-12-23 16:19   ` Borislav Petkov
2021-12-27 18:22     ` Alexander Lobakin
2021-12-27 21:26       ` Borislav Petkov
2021-12-28 17:03         ` Alexander Lobakin
2022-01-03 13:07   ` Miroslav Benes
2021-12-23  0:21 ` [PATCH v9 02/15] livepatch: use `-z unique-symbol` if available to nuke pos-based search Alexander Lobakin
2021-12-30 11:10   ` Borislav Petkov
2021-12-30 18:31     ` Fāng-ruì Sòng
2022-01-03 13:55       ` Miroslav Benes [this message]
2022-01-03 16:06         ` Alexander Lobakin
2022-01-05  3:24           ` Fāng-ruì Sòng
2022-01-03 16:29     ` Alexander Lobakin
2022-01-03 13:44   ` Miroslav Benes
2021-12-23  0:21 ` [PATCH v9 03/15] kallsyms: Hide layout Alexander Lobakin
2021-12-30 22:36   ` Borislav Petkov
2022-01-03 15:40     ` Alexander Lobakin
2022-01-03 16:59       ` Borislav Petkov
2022-01-05 18:46   ` Borislav Petkov
2021-12-23  0:21 ` [PATCH v9 04/15] arch: introduce ASM function sections Alexander Lobakin
2022-01-17 21:08   ` Borislav Petkov
2022-01-17 21:38     ` Nicolas Pitre
2022-01-17 21:55       ` Borislav Petkov
2021-12-23  0:21 ` [PATCH v9 05/15] x86: support " Alexander Lobakin
2022-01-21 15:08   ` Borislav Petkov
2022-01-26 14:49     ` Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 06/15] x86: decouple ORC table sorting into a separate file Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 07/15] Makefile: Add build and config option for CONFIG_FG_KASLR Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 08/15] x86/tools: Add relative relocs for randomized functions Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 09/15] x86: Add support for function granular KASLR Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 10/15] FG-KASLR: use a scripted approach to handle .text.* sections Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 11/15] x86/boot: allow FG-KASLR to be selected Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 12/15] module: Reorder functions Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 13/15] module: use a scripted approach for FG-KASLR Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 14/15] Documentation: add documentation " Alexander Lobakin
2021-12-23  0:22 ` [PATCH v9 15/15] maintainers: add MAINTAINERS entry " Alexander Lobakin
2021-12-23 15:15 ` [PATCH v9 00/15] Function Granular KASLR Alexander Lobakin
2021-12-23 15:40   ` Peter Zijlstra
2021-12-24  6:38 ` Christoph Hellwig
2021-12-27 18:33   ` Alexander Lobakin
2021-12-30  9:00     ` Christoph Hellwig

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