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Re: [PATCH 2/6] IPC namespace - utils [message #3720 is a reply to message #3719]

Mon, 12 June 2006 18:01

ebiederm
Messages: 1354
Registered: February 2006

Senior Member

Cedric Le Goater <clg@fr.ibm.com> writes:

> 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().

Possibly which case are you trying to prevent?

> * 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 ?

No. As long as the code handles that case properly we should be fine.
As a general principle we should be able to keep things from other namespaces
open if we get them. The chroot or equivalent binary is the one that needs
to ensure these kinds of issues don't exist if we care.

Speaking of we should put together a small test application probably similar
to chroot so people can access these features at least for testing.

> Small fix follows,
>
> thanks,
>
> C.

Ack. For the unshare fix below. Could you resend this one separately with
patch in the subject so Andrew sees it and picks up?

> From: Cedric Le Goater <clg@fr.ibm.com>
> Subject: ipc namespace : unshare fix
>
> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
>
> ---
> kernel/fork.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: 2.6.17-rc6-mm2/kernel/fork.c
> ============================================================ =======
> --- 2.6.17-rc6-mm2.orig/kernel/fork.c
> +++ 2.6.17-rc6-mm2/kernel/fork.c
> @@ -1599,7 +1599,8 @@ asmlinkage long sys_unshare(unsigned lon
> /* Return -EINVAL for all unsupported flags */
> err = -EINVAL;
> if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
> - CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|CLONE_NEWUTS))
> + CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
> + CLONE_NEWUTS|CLONE_NEWIPC))
> goto bad_unshare_out;
>
> if ((err = unshare_thread(unshare_flags)))

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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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