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

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Message-ID: <20141218133651.GC9885@dhcp128.suse.cz>
Date:	Thu, 18 Dec 2014 14:36:51 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Seth Jennings <sjenning@...hat.com>
Cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	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 2014-12-16 11:58:19, 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 like the current state. Thanks a lot for the effort.

Reviewed-by: Petr Mladek <pmladek@...e.cz>

and for my changes:

Signed-off-by: Petr Mladek <pmladek@...e.cz>

Best Regards,
Petr
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