linux-kernel - Re: [PATCHv2 2/3] kernel: add support for live patching

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Date:	Fri, 21 Nov 2014 15:41:10 +0100 (CET)
From:	Miroslav Benes <mbenes@...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>,
	Petr Mladek <pmladek@...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: [PATCHv2 2/3] kernel: add support for live patching

On Thu, 20 Nov 2014, Seth Jennings wrote:

> On Thu, Nov 20, 2014 at 11:35:52AM -0600, Josh Poimboeuf wrote:
> > On Thu, Nov 20, 2014 at 02:10:33PM +0100, Miroslav Benes wrote:
> > > 
> > > On Sun, 16 Nov 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>
> > > 
> > > Hi,
> > > 
> > > below is the patch which merges the internal and external data structures 
> > > (so it is only one part of our original patch for version 1). Apart from 
> > > that I tried to make minimal changes to the code. Only unnecessary 
> > > kobjects were removed and I renamed lpc_create_* functions to lpc_init_* 
> > > as it made more sense in this approach, I think.
> > > 
> > > I hope this clearly shows our point of view stated previously. What do 
> > > you say?
> > 
> > Thanks for rebasing to v2 and splitting up the patches!  Personally I'm
> > ok with this patch (though I do have a few comments below).
> 
> Thanks Josh :)
> 
> Miroslav, before you send out a revision on this patch, I'm merging it
> for v3 right now.  I'll fixup any trivial fixes from this email.
> 
> I'm putting the finishing touches on v3 now.  Hopefully it will make
> everyone happy, or happier, with your changes merged.  Should be getting
> close...
> 
> Thanks,
> Seth

Ok, thank you for the fixes and merging. I'll take a closer look at v3 to 
be sure that everything is ok.

Mira
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