linux-kernel - Re: [PATCH] Hibernation: Document __save_processor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071230213126.GB14654@elte.hu>
Date:	Sun, 30 Dec 2007 22:31:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@...e.cz>
Subject: Re: [PATCH] Hibernation: Document __save_processor_state() on
	x86-64


* Rafael J. Wysocki <rjw@...k.pl> wrote:

> > how different can it be, for resume to work? I mean, we'll have 
> > deeply kernel version dependent variables in RAM. Am i missing 
> > something obvious?
> 
> On x86-64 it can be almost totally different (by restoring a 
> hibernation image we replace the entire contents of RAM with almost no 
> constraints).
> 
> [Well, using a relocatable kernel for restoring an image with 
> nonrelocatable one or vice versa is rather not the best idea, but 
> everything else should work in theory.]
> 
> On i386 the boot kernel is still required to be the same as the one in 
> the image.

what's exactly in the hibernation image? Dirty data i suppose - but what 
about kernel-internal pages. What if we go from SLAB to SLUB? What if 
the size of a structure changes? Etc.

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/