linux-kernel - Re: [RFC][PATCH 1/9] klp: Fix obvious RCU fail

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Message-ID: <20150302100010.GJ21418@twins.programming.kicks-ass.net>
Date:	Mon, 2 Mar 2015 11:00:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	mingo@...nel.org, rusty@...tcorp.com.au,
	mathieu.desnoyers@...icios.com, oleg@...hat.com,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	andi@...stfloor.org, rostedt@...dmis.org, tglx@...utronix.de,
	Seth Jennings <sjenning@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.cz>
Subject: Re: [RFC][PATCH 1/9] klp: Fix obvious RCU fail

On Mon, Mar 02, 2015 at 10:13:05AM +0100, Jiri Kosina wrote:
> On Mon, 2 Mar 2015, Peter Zijlstra wrote:

> > That said; I do have a follow up question on that code. So now you've
> > successfully obtained an address in module space; but the moment you
> > release that RCU-sched lock, the module can be gone.
> > 
> > How does the whole live patching stuff deal with module removal during
> > patching?
> 
> We have a module notifier that serializes using klp_mutex with the 
> patching. Do you see a problem there?

Should work I think; might be worth noting this in a comment above this
lookup though.
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