linux-kernel - Re: [PATCHv7 2/3] kernel: add support for live patching

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Message-ID: <alpine.LNX.2.00.1412190837540.1680@pobox.suse.cz>
Date:	Fri, 19 Dec 2014 08:39:57 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Seth Jennings <sjenning@...hat.com>
cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Petr Mladek <pmladek@...e.cz>, Miroslav Benes <mbenes@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv7 2/3] kernel: add support for live patching

On Tue, 16 Dec 2014, Seth Jennings wrote:

> This commit introduces code for the live patching core.  It implements
> an ftrace-based mechanism and kernel interface for doing live patching
> of kernel and kernel module functions.
> 
> It represents the greatest common functionality set between kpatch and
> kgraft and can accept patches built using either method.
> 
> This first version does not implement any consistency mechanism that
> ensures that old and new code do not run together.  In practice, ~90% of
> CVEs are safe to apply in this way, since they simply add a conditional
> check.  However, any function change that can not execute safely with
> the old version of the function can _not_ be safely applied in this
> version.
> 
> Signed-off-by: Seth Jennings <sjenning@...hat.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>

I have finally finished reviewing this as well.

Reviewed-by: Jiri Kosina <jkosina@...e.cz>

and

Signed-off-by: Jiri Kosina <jkosina@...e.cz>

for the changes I contributed.

I'll wait a bit more to eventually gather more acks / review comments, and 
will then push it to git.kernel.org repository (with SUSE copyright added 
to livepatch.c) and have included in linux-next, as discussed before.

Thanks!

-- 
Jiri Kosina
SUSE Labs
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