linux-kernel - Re: [patch 0/2] x86: NMI-safe trap handlers

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: <20100714185617.GB22373@basil.fritz.box>
Date:	Wed, 14 Jul 2010 20:56:17 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Steven Rostedt <rostedt@...tedt.homelinux.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Christoph Hellwig <hch@....de>, Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [patch 0/2] x86: NMI-safe trap handlers

On Wed, Jul 14, 2010 at 01:08:05PM -0400, Mathieu Desnoyers wrote:
> * Andi Kleen (andi@...stfloor.org) wrote:
> > > x86_32 cannot use vmalloc_sync_all() to sychronize the TLBs from every
> > > processes because the vmalloc area is mapped in a different address space for
> > 
> > That doesn't make sense. vmalloc_all_sync() should work on 32bit too.
> > It just needs to walk all processes and fix up every page table.
> 
> Yeah, I've been taken aback when Tejun told me that a few moments ago. I
> initially thought that vmalloc_sync_all() synchronized all page mappings of all
> processes on x86_32. But apparently that does not seem to be the case. I'm
> adding him in CC.

Well it worked when it was originally written. That was for the case
of a NMI handler in a module. If it doesn't work fix it. I don't 
think the NMI-safe fault is really needed with it.

-Andi
--
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/