linux-kernel - Re: live patching design (was: Re: [PATCH 1/3] sched: add sched_task

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Date:	Sat, 21 Feb 2015 21:53:33 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Ingo Molnar <mingo@...nel.org>
cc:	Vojtech Pavlik <vojtech@...e.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: live patching design (was: Re: [PATCH 1/3] sched: add
 sched_task_call())

To make sure that this thread doesn't conclude in void, here's my take on 
it:

- what's currently alredy there is the simplest-of-simplest methods; it
  allows you to apply context-less patches (such as adding bounds checking 
  to the beginning of syscall, etc), which turns out to cover vast portion 
  of applicable CVEs

- it can always be made more clever; patch author always has to know the 
  version of the kernel he's preparing the patch for anyway (the live 
  patch and the kernel is closely tied together)

- the proposal to force sleeping or CPU-hogging tasks through a defined 
  safe checkpoint using a fake sort-of signal without any other 
  sideeffects might be useful even for kGraft and also for other proposed 
  aproaches. I think we'll try to implement this as an optimization for 
  kGraft and we'll see how (a) fast (b) non-intrusive we would be able to 
  make it. If it turns out to be successful, we can then just reuse it in 
  the upstream solution (whatever that would be)

Thanks,

-- 
Jiri Kosina
SUSE Labs
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