linux-kernel - Re: [PATCH 1/2] break out page allocation warning code

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:	Tue, 19 Apr 2011 14:21:59 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] break out page allocation warning code

On Tue, 19 Apr 2011, KOSAKI Motohiro wrote:

> The rule is,
> 
> 1) writing comm
> 	need task_lock
> 2) read _another_ thread's comm
> 	need task_lock
> 3) read own comm
> 	no need task_lock
> 

That was true a while ago, but you now need to protect every thread's 
->comm with get_task_comm() or ensuring task_lock() is held to protect 
against /proc/pid/comm which can change other thread's ->comm.  That was 
different before when prctl(PR_SET_NAME) would only operate on current, so 
no lock was needed when reading current->comm.
--
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/