LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Kristen Carlson Accardi <kristen@linux.intel.com>
To: Kees Cook <keescook@chromium.org>
Cc: Joe Lawrence <joe.lawrence@redhat.com>,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	arjan@linux.intel.com, x86@kernel.org,
	linux-kernel@vger.kernel.org,
	kernel-hardening@lists.openwall.com, rick.p.edgecombe@intel.com,
	live-patching@vger.kernel.org
Subject: Re: [PATCH v4 00/10] Function Granular KASLR
Date: Mon, 10 Aug 2020 09:10:41 -0700
Message-ID: <6b96dcb30b9e1ab1638979c09462614aa2976721.camel@linux.intel.com> (raw)
In-Reply-To: <202008071019.BF206AE8BD@keescook>

On Fri, 2020-08-07 at 10:20 -0700, Kees Cook wrote:
> On Fri, Aug 07, 2020 at 09:38:11AM -0700, Kristen Carlson Accardi
> wrote:
> > Thanks for testing. Yes, Josh and I have been discussing the
> > orc_unwind
> > issues. I've root caused one issue already, in that objtool places
> > an
> > orc_unwind_ip address just outside the section, so my algorithm
> > fails
> > to relocate this address. There are other issues as well that I
> > still
> > haven't root caused. I'll be addressing this in v5 and plan to have
> > something that passes livepatch testing with that version.
> 
> FWIW, I'm okay with seeing fgkaslr be developed progressively.
> Getting
> it working with !livepatching would be fine as a first step. There's
> value in getting the general behavior landed, and then continuing to
> improve it.
> 

In this case, part of the issue with livepatching appears to be a more
general issue with objtool and how it creates the orc unwind entries
when you have >64K sections. So livepatching is a good test case for
making sure that the orc tables are actually correct. However, the
other issue with livepatching (the duplicate symbols), might be worth
deferring if the solution is complex - I will keep that in mind as I
look at it more closely.



  reply index

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17 16:59 Kristen Carlson Accardi
2020-07-17 16:59 ` [PATCH v4 01/10] objtool: Do not assume order of parent/child functions Kristen Carlson Accardi
2020-07-17 16:59 ` [PATCH v4 02/10] x86: tools/relocs: Support >64K section headers Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 03/10] x86/boot: Allow a "silent" kaslr random byte fetch Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 04/10] x86: Makefile: Add build and config option for CONFIG_FG_KASLR Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 05/10] x86: Make sure _etext includes function sections Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 06/10] x86/tools: Add relative relocs for randomized functions Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 07/10] x86/boot/compressed: Avoid duplicate malloc() implementations Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 08/10] x86: Add support for function granular KASLR Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 09/10] kallsyms: Hide layout Kristen Carlson Accardi
2020-07-20  1:25   ` Kees Cook
2020-07-20 16:59     ` Kristen Carlson Accardi
2020-07-17 17:00 ` [PATCH v4 10/10] module: Reorder functions Kristen Carlson Accardi
2020-07-28 17:29   ` Jessica Yu
2020-07-22  9:27 ` [PATCH v4 00/10] Function Granular KASLR Miroslav Benes
2020-07-22 14:39   ` Kees Cook
2020-07-22 14:51     ` Joe Lawrence
2020-07-22 14:56       ` Joe Lawrence
2020-07-22 18:24         ` Kristen Carlson Accardi
2020-07-22 16:07     ` Josh Poimboeuf
2020-07-22 19:42       ` Kees Cook
2020-07-22 19:56         ` Kristen Carlson Accardi
2020-07-22 21:33           ` Josh Poimboeuf
2020-08-21 23:02             ` Kristen Carlson Accardi
2020-08-25 16:16               ` Joe Lawrence
2020-08-28 10:21               ` Miroslav Benes
2020-08-28 19:24                 ` Josh Poimboeuf
2021-01-23 22:59                   ` Fangrui Song
2021-01-25 17:21                     ` Josh Poimboeuf
2020-08-03 11:39   ` Evgenii Shatokhin
2020-08-03 17:45     ` Kees Cook
2020-08-03 18:17       ` Joe Lawrence
2020-08-03 19:38         ` Frank Ch. Eigler
2020-08-03 20:11           ` Kees Cook
2020-08-03 21:12             ` Frank Ch. Eigler
2020-08-03 21:41               ` Kees Cook
2020-08-04  0:48                 ` Frank Ch. Eigler
2020-08-04 17:04         ` Jessica Yu
2020-08-04 18:23 ` Joe Lawrence
2020-08-07 16:38   ` Kristen Carlson Accardi
2020-08-07 17:20     ` Kees Cook
2020-08-10 16:10       ` Kristen Carlson Accardi [this message]
2020-08-12 17:18   ` Kristen Carlson Accardi
2020-08-06 15:32 ` Ingo Molnar
2020-08-06 19:24   ` Kristen Carlson Accardi
2020-08-06 19:27   ` Kees Cook

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=6b96dcb30b9e1ab1638979c09462614aa2976721.camel@linux.intel.com \
    --to=kristen@linux.intel.com \
    --cc=arjan@linux.intel.com \
    --cc=bp@alien8.de \
    --cc=joe.lawrence@redhat.com \
    --cc=keescook@chromium.org \
    --cc=kernel-hardening@lists.openwall.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=live-patching@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=rick.p.edgecombe@intel.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git