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From: Andrew Cooper <Andrew.Cooper3@citrix.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Joao Moreira <joao@overdrivepizza.com>
Cc: Kees Cook <keescook@chromium.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"hjl.tools@gmail.com" <hjl.tools@gmail.com>,
	"jpoimboe@redhat.com" <jpoimboe@redhat.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"ndesaulniers@google.com" <ndesaulniers@google.com>,
	"samitolvanen@google.com" <samitolvanen@google.com>,
	"llvm@lists.linux.dev" <llvm@lists.linux.dev>
Subject: Re: [RFC][PATCH 6/6] objtool: Add IBT validation / fixups
Date: Wed, 16 Feb 2022 00:57:47 +0000	[thread overview]
Message-ID: <a599d509-8995-0eb6-65a1-5d8505e4851e@citrix.com> (raw)
In-Reply-To: <20220211133803.GV23216@worktop.programming.kicks-ass.net>

On 11/02/2022 13:38, Peter Zijlstra wrote:
> Now, this setup provides:
>
>  - minimal size (please yell if there's a smaller option I missed;
>    s/ud2/int3/ ?)

It's probably best not to overload int3.  #BP is already has magic
properties, and what happens if someone wants to breakpoint one of these?

I'll make my usual into suggestion for 64bit builds.

ud2 is the sensible approach, with a caveat that whatever is hiding here
should have metadata.

~Andrew

  parent reply	other threads:[~2022-02-16  0:57 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-22 17:03 [RFC][PATCH 0/6] x86: Kernel IBT beginnings Peter Zijlstra
2021-11-22 17:03 ` [RFC][PATCH 1/6] x86: Annotate _THIS_IP_ Peter Zijlstra
2021-11-23 13:53   ` Mark Rutland
2021-11-23 14:14     ` Peter Zijlstra
2021-11-24 18:18       ` Josh Poimboeuf
2021-11-22 17:03 ` [RFC][PATCH 2/6] x86: Base IBT bits Peter Zijlstra
2022-02-08 23:32   ` Kees Cook
2021-11-22 17:03 ` [RFC][PATCH 3/6] x86: Add ENDBR to IRET-to-Self Peter Zijlstra
2021-11-22 18:09   ` Peter Zijlstra
2022-02-08 23:33     ` Kees Cook
2021-11-22 17:03 ` [RFC][PATCH 4/6] objtool: Read the _THIS_IP_ hints Peter Zijlstra
2021-11-22 17:03 ` [RFC][PATCH 5/6] x86: Sprinkle ENDBR dust Peter Zijlstra
2021-11-23 14:00   ` Mark Rutland
2021-11-23 14:21     ` Peter Zijlstra
2022-02-08 23:38     ` Kees Cook
2021-11-22 17:03 ` [RFC][PATCH 6/6] objtool: Add IBT validation / fixups Peter Zijlstra
2021-11-24 19:30   ` Josh Poimboeuf
2022-02-08 23:43     ` Kees Cook
2022-02-09  5:09       ` Josh Poimboeuf
2022-02-09 11:41       ` Peter Zijlstra
2022-02-09 11:45         ` Peter Zijlstra
2021-12-24  2:05   ` joao
2022-02-08 23:42     ` Kees Cook
2022-02-09  2:21       ` Joao Moreira
2022-02-09  4:05         ` Kees Cook
2022-02-09  5:18           ` Joao Moreira
2022-02-11 13:38             ` Peter Zijlstra
2022-02-14 21:38               ` Sami Tolvanen
2022-02-14 22:25                 ` Peter Zijlstra
2022-02-15 16:56                   ` Sami Tolvanen
2022-02-15 20:03                     ` Kees Cook
2022-02-15 21:05                       ` Peter Zijlstra
2022-02-15 23:05                         ` Kees Cook
2022-02-15 23:38                           ` Joao Moreira
2022-02-16 12:24                         ` Peter Zijlstra
2022-02-15 20:53                     ` Peter Zijlstra
2022-02-15 22:45               ` Joao Moreira
2022-02-16  0:57               ` Andrew Cooper [this message]
2022-03-02  3:06               ` Peter Collingbourne
2022-03-02  3:32                 ` Joao Moreira
2022-06-08 17:53                 ` Fāng-ruì Sòng
2022-06-09  0:05                   ` Sami Tolvanen
2021-11-23  7:58 ` [RFC][PATCH 0/6] x86: Kernel IBT beginnings Christoph Hellwig
2021-11-23  9:02   ` Peter Zijlstra
2022-02-08 23:48 ` Kees Cook
2022-02-09  0:09 ` Nick Desaulniers

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