linux-kernel - Re: [PATCH] Add cgroup support for enabling controllers at boot time

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: <alpine.DEB.1.00.0803061108370.13110@chino.kir.corp.google.com>
Date:	Thu, 6 Mar 2008 11:10:28 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
cc:	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH] Add cgroup support for enabling controllers at boot
 time

On Fri, 7 Mar 2008, Balbir Singh wrote:

> @@ -3010,3 +3020,16 @@ static void cgroup_release_agent(struct 
>  	spin_unlock(&release_list_lock);
>  	mutex_unlock(&cgroup_mutex);
>  }
> +
> +static int __init cgroup_disable(char *str)
> +{
> +	int i;
> +	for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
> +		struct cgroup_subsys *ss = subsys[i];
> +		if (!strcmp(str, ss->name)) {
> +			ss->disabled = 1;
> +			break;
> +		}
> +	}
> +}
> +__setup("cgroup_disable=", cgroup_disable);

This doesn't handle spaces very well, so isn't it possible for the name of 
a current or future cgroup subsystem to be specified after cgroup_disable= 
on the command line and have it disabled by accident?

> diff -puN Documentation/kernel-parameters.txt~cgroup_disable Documentation/kernel-parameters.txt
> --- linux-2.6.25-rc4/Documentation/kernel-parameters.txt~cgroup_disable	2008-03-06 17:57:32.000000000 +0530
> +++ linux-2.6.25-rc4-balbir/Documentation/kernel-parameters.txt	2008-03-06 18:00:32.000000000 +0530
> @@ -383,6 +383,10 @@ and is between 256 and 4096 characters. 
>  	ccw_timeout_log [S390]
>  			See Documentation/s390/CommonIO for details.
>  
> +	cgroup_disable= [KNL] Enable disable a particular controller
> +			Format: {name of the controller}
> +			See /proc/cgroups for a list of compiled controllers
> +

This works on multiple controllers, though, if they follow 
cgroup_disable=, so the documentation and format should reflect that.
--
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/