linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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: <20110214.134600.179933733.davem@davemloft.net>
Date:	Mon, 14 Feb 2011 13:46:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rostedt@...dmis.org
Cc:	peterz@...radead.org, will.newton@...il.com, jbaron@...hat.com,
	mathieu.desnoyers@...ymtl.ca, hpa@...or.com, mingo@...e.hu,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, sam@...nborg.org,
	ddaney@...iumnetworks.com, michael@...erman.id.au,
	linux-kernel@...r.kernel.org, vapier@...too.org,
	cmetcalf@...era.com, dhowells@...hat.com, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, benh@...nel.crashing.org
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

From: Steven Rostedt <rostedt@...dmis.org>
Date: Mon, 14 Feb 2011 16:39:36 -0500

> Thus it is not about global, as global is updated by normal means and
> will update the caches. atomic_t is updated via the ll/sc that ignores
> the cache and causes all this to break down. IOW... broken hardware ;)

I don't see how cache coherency can possibly work if the hardware
behaves this way.

In cache aliasing situations, yes I can understand a L1 cache visibility
issue being present, but with kernel only stuff that should never happen
otherwise we have a bug in the arch cache flushing support.
--
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/