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Re: [PATCH 2/6] IPC namespace - utils [message #3719 is a reply to message #3670]

Mon, 12 June 2006 17:08

Cedric Le Goater
Messages: 443
Registered: February 2006

Senior Member

Kirill Korotaev wrote:

> +static struct ipc_namespace *clone_ipc_ns(struct ipc_namespace *old_ns)
> +{
> + int err;
> + struct ipc_namespace *ns;
> +
> + err = -ENOMEM;
> + ns = kmalloc(sizeof(struct ipc_namespace), GFP_KERNEL);
> + if (ns == NULL)
> + goto err_mem;
> +
> + err = sem_init_ns(ns);
> + if (err)
> + goto err_sem;
> + err = msg_init_ns(ns);
> + if (err)
> + goto err_msg;
> + err = shm_init_ns(ns);
> + if (err)
> + goto err_shm;
> +
> + kref_init(&ns->kref);
> + return ns;
> +
> +err_shm:
> + msg_exit_ns(ns);
> +err_msg:
> + sem_exit_ns(ns);
> +err_sem:
> + kfree(ns);
> +err_mem:
> + return ERR_PTR(err);
> +}

I've used the ipc namespace patchset in rc6-mm2. Thanks for putting this
together, it works pretty well ! A few questions when we clone :

* We should do something close to what exit_sem() already does to clear the
sem_undo list from the task doing the clone() or unshare().

* I don't like the idea of being able to unshare the ipc namespace and keep
some shared memory from the previous ipc namespace mapped in the process mm.
Should we forbid the unshare ?

Small fix follows,

thanks,

C.

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[Message index]

		[PATCH] IPC namespace By: Kirill Korotaev on Fri, 09 June 2006 14:55
		[PATCH 1/6] IPC namespace core By: Kirill Korotaev on Fri, 09 June 2006 15:01
		Re: [PATCH 1/6] IPC namespace core By: James Morris on Fri, 09 June 2006 15:26
		Re: [PATCH 1/6] IPC namespace core By: Cedric Le Goater on Fri, 09 June 2006 15:20
		Re: [PATCH 1/6] IPC namespace core By: Andrew Morton on Fri, 09 June 2006 18:38
		Re: [PATCH 1/6] IPC namespace core By: ebiederm on Sat, 10 June 2006 00:44
		Re: [PATCH 1/6] IPC namespace core By: Andrew Morton on Sat, 10 June 2006 03:22
		[PATCH 2/6] IPC namespace - utils By: Kirill Korotaev on Fri, 09 June 2006 15:05
		Re: [PATCH 2/6] IPC namespace - utils By: Cedric Le Goater on Mon, 12 June 2006 17:08
		Re: [PATCH 2/6] IPC namespace - utils By: ebiederm on Mon, 12 June 2006 18:01
		Re: [PATCH 2/6] IPC namespace - utils By: Cedric Le Goater on Mon, 12 June 2006 21:05
		Re: [PATCH 2/6] IPC namespace - utils By: ebiederm on Mon, 12 June 2006 21:49
		Re: [PATCH 2/6] IPC namespace - utils By: Cedric Le Goater on Tue, 13 June 2006 21:17
		Re: [PATCH 2/6] IPC namespace - utils By: dev on Wed, 14 June 2006 11:14
		[PATCH 3/6] IPC namespace - msg By: Kirill Korotaev on Fri, 09 June 2006 15:07
		[PATCH 4/6] IPC namespace - sem By: Kirill Korotaev on Fri, 09 June 2006 15:08
		[PATCH 5/6] IPC namespace - shm By: Kirill Korotaev on Fri, 09 June 2006 15:09
		[PATCH 6/6] IPC namespace - sysctls By: Kirill Korotaev on Fri, 09 June 2006 15:11
		Re: [PATCH] IPC namespace By: Dave Hansen on Mon, 12 June 2006 17:19
		Re: [PATCH] IPC namespace By: ebiederm on Tue, 13 June 2006 02:44
		Re: [PATCH] IPC namespace By: dev on Tue, 13 June 2006 16:41
		Re: [PATCH] IPC namespace By: ebiederm on Tue, 13 June 2006 17:01

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