From: Kees Cook <keescook@chromium.org>
To: Joao Moreira <joao@overdrivepizza.com>
Cc: 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, 1 Nov 2022 14:39:57 -0700 [thread overview]
Message-ID: <202211011437.F82B61B8C@keescook> (raw)
In-Reply-To: <baced047981ff5fce633156e3e374dfd@overdrivepizza.com>
On Mon, Oct 31, 2022 at 12:13:50PM -0700, Joao Moreira wrote:
> On 2022-10-18 22:19, Kees Cook wrote:
> > On Tue, Oct 18, 2022 at 09:48:42PM -0700, Joao Moreira wrote:
> > > > > Is it useful to get the compiler to emit 0xcc with
> > > > > -fpatchable-function-entry under any circumstance? I can probably
> > > > > change
> > > > > that quickly if needed/useful.
> > > >
> > > > Having it emit 0xcc for the bytes in front of the symbol might be
> > > > interesting. It would mean a few kernel changes, but nothing too hard.
>
> Should I push for this within clang? I have the patch semi-ready (below) and
> would have some cycles this week for polishing it.
Sure! While the NOP vs CC issue isn't very interesting when IBT is
available, it's nice for non-IBT to make attackers have to target
addresses precisely.
If it's really invasive or hard to maintain in Clang (or objtool),
then I'd say leave it as-is.
--
Kees Cook
next prev parent reply other threads:[~2022-11-01 21:40 UTC|newest]
Thread overview: 44+ 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
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 [this message]
2022-11-01 21:50 ` Joao Moreira
2024-05-06 17:36 ` Kees Cook
2024-05-07 1:45 ` 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
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