linux-kernel - Re: [PATCH] time: Add locking to xtime access in get

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]

Date:	Wed, 04 May 2011 09:51:00 -0700
From:	Max Asbock <masbock@...ux.vnet.ibm.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] time: Add locking to xtime access in get_seconds()

On Tue, 2011-05-03 at 20:11 -0700, John Stultz wrote:
> From: John Stultz <johnstul@...ibm.com>
> 
> So get_seconds() has always been lock free, with the assumption
> that accessing a long will be atomic.
> 

get_seconds() is used in the x86 machine check handler and there is a
comment saying:
/* We hope get_seconds stays lockless */

This needs to be carefully looked at if locking is introduced to
get_seconds().

- Max

--
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/