linux-kernel - Re: [PATCH v2] x86, kaslr: export offset in VMCOREINFO ELF notes

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Message-ID: <20140127161959.GD4941@twins.programming.kicks-ass.net>
Date:	Mon, 27 Jan 2014 17:19:59 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, Kees Cook <keescook@...omium.org>,
	crash-utility@...hat.com, linux-kernel@...r.kernel.org,
	Dave Anderson <anderson@...hat.com>,
	Andrew Honig <ahonig@...gle.com>,
	Eugene Surovegin <surovegin@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v2] x86, kaslr: export offset in VMCOREINFO ELF notes

On Mon, Jan 27, 2014 at 05:56:38PM +0200, Adrian Hunter wrote:
> No. In fact annotation works now with kcore.  Linus' problem was with vmlinux.
> 
> Kcore won't be used with kaslr in the case:
> 	1. record data with 'perf record'
> 	2. reboot
> 	3. use annotation on the previously recorded data
> 
> As I noted in the commit message, you can still use kcore if you made a copy
> (with perf buildid-cache) at the time the data was recorded.

Not that I care much about this particular case; but you could also save
the offset at record time and do double offset correction assuming its
still the same kernel you booted into but at a different location.


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