From: Kees Cook <keescook@chromium.org>
To: Joao Moreira <joao@overdrivepizza.com>
Cc: David Laight <David.Laight@aculab.com>,
'Peter Zijlstra' <peterz@infradead.org>,
x86@kernel.org, Sami Tolvanen <samitolvanen@google.com>,
linux-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: [PATCH] x86/ibt: Implement FineIBT
Date: Tue, 18 Oct 2022 22:33:17 -0700 [thread overview]
Message-ID: <202210182232.FC83CB5@keescook> (raw)
In-Reply-To: <24d4e2f277ecaa435075745817f2bd61@overdrivepizza.com>
On Tue, Oct 18, 2022 at 01:09:25PM -0700, Joao Moreira wrote:
> On 2022-10-18 10:20, Kees Cook wrote:
> > On Tue, Oct 18, 2022 at 08:58:24AM -0700, Joao Moreira wrote:
> > > > Does the hash value for kCFI only depend on the function type?
> > > > Or is there something like a attribute that can also be included?
> > >
> > > Hi David -- does this sound like what you are asking about?
> > >
> > > https://github.com/ClangBuiltLinux/linux/issues/1736
> > >
> > > If yes, then it is something in our todo list :) I think Sami is
> > > handling
> > > it.
> >
> > I was hoping someone with prior experience with Call Graph Detaching to
> > solve Transitive Clustering Relaxation[1] could assist? ;)
>
> Hi Kees, thanks for bringing these slides up.
>
> Yeah, I would be glad to help out with automating this sort of analysis.
> CGD, as explained in these slides would not help much here, because it was
> more of an optimization to reduce the number of allowed targets on returns
> (we did not have an almighty shadow stack at the time). Yet there are lots
> of other things we might be able to do, both statically and dynamically.
> Recent relevant research about this is multi-layer type analysis [1], which
> I may find the time to look into more deeply soon.
>
> 1 - https://www-users.cse.umn.edu/~kjlu/papers/mlta.pdf
Awesome! Yeah, getting the big "common" hashes broken up by separate
clusters would be lovely.
--
Kees Cook
next prev parent reply other threads:[~2022-10-19 5:33 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 13:35 [PATCH] x86/ibt: Implement FineIBT Peter Zijlstra
2022-10-18 14:43 ` David Laight
2022-10-18 15:58 ` Joao Moreira
2022-10-18 17:20 ` Kees Cook
2022-10-18 20:09 ` Joao Moreira
2022-10-19 5:33 ` Kees Cook [this message]
2022-10-18 21:27 ` David Laight
2022-10-18 14:47 ` Peter Zijlstra
2022-10-18 18:09 ` Kees Cook
2022-10-18 19:56 ` Peter Zijlstra
2022-10-18 23:31 ` Josh Poimboeuf
2022-10-19 5:22 ` Kees Cook
2022-10-19 11:38 ` Peter Zijlstra
2022-10-19 5:14 ` Kees Cook
2022-10-18 19:59 ` Peter Zijlstra
2022-10-18 21:09 ` Peter Zijlstra
2022-10-19 5:05 ` Kees Cook
2022-10-19 12:03 ` Peter Zijlstra
2022-10-19 15:22 ` Sami Tolvanen
2022-10-20 11:04 ` Peter Zijlstra
2022-10-18 19:59 ` Joao Moreira
2022-10-19 5:32 ` Kees Cook
2022-10-19 19:35 ` Joao Moreira
2022-10-18 20:05 ` Peter Zijlstra
2022-10-19 5:00 ` Kees Cook
2022-10-18 20:09 ` Peter Zijlstra
2022-10-18 20:17 ` Joao Moreira
2022-10-18 20:30 ` Peter Zijlstra
2022-10-19 4:48 ` Joao Moreira
2022-10-19 5:19 ` Kees Cook
2022-10-31 19:13 ` Joao Moreira
2022-11-01 21:39 ` Kees Cook
2022-11-01 21:50 ` Joao Moreira
2022-10-19 5:18 ` Kees Cook
2022-10-19 5:16 ` Kees Cook
2022-10-20 11:05 ` Peter Zijlstra
2022-10-18 23:38 ` Josh Poimboeuf
2022-10-19 7:29 ` Peter Zijlstra
2022-10-21 23:08 ` Josh Poimboeuf
2022-10-22 15:03 ` Peter Zijlstra
2022-10-24 17:15 ` Sami Tolvanen
2022-10-24 18:38 ` Joao Moreira
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=202210182232.FC83CB5@keescook \
--to=keescook@chromium.org \
--cc=David.Laight@aculab.com \
--cc=joao@overdrivepizza.com \
--cc=jpoimboe@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=peterz@infradead.org \
--cc=samitolvanen@google.com \
--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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).