linux-kernel - Re: suspend blockers & Android integration

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20100604100306.GB3324@elte.hu>
Date:	Fri, 4 Jun 2010 12:03:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	tytso@....edu, Brian Swetland <swetland@...gle.com>,
	Neil Brown <neilb@...e.de>, Arve Hj?nnev?g <arve@...roid.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	James Bottomley <James.Bottomley@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: suspend blockers & Android integration


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, 2010-06-04 at 11:43 +0200, Peter Zijlstra wrote:
> > I still believe containment is a cgroup problem. The freeze/snapshot/resume
> > container folks seem to face many of the same problems. Including the
> > pending timer one I suspect. Lets solve it there. 
> 
> While talking to Thomas about this, we'd probably need a CLOCK_MONOTONIC 
> namespace to pull this off, so that resumed apps don't see the jump in 
> absolute time.
> 
> This would also help with locating the relevant timers, since they'd be on 
> the related timer base.

Ok - this looks workable, and looks technically isolated that can be pursued 
as a separate module of this whole topic.

> The only 'interesting' issue I can see here is that if you create 1000 
> CLOCK_MONOTONIC namepaces, we'd need to have a tree of trees in order to 
> efficiently find the leftmost timer.

Realistically Android userspace would create just a single such namespace for 
all the untrusted/unknown/uncontrolled apps, right?

	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/