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userns: add a user namespace owner of ipc ns

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Changelog:
	Feb 15: Don't set new ipc->user_ns if we didn't create a new
		ipc_ns.
	Feb 23: Move extern declaration to ipc_namespace.h, and group
		fwd declarations at top.

Signed-off-by: Serge E. Hallyn <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Acked-by: Daniel Lezcano <[email protected]>
Acked-by: David Howells <[email protected]>
Cc: James Morris <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Serge E. Hallyn 2011-03-23 16:43:23 -07:00 • committed by Linus Torvalds
commit b515498f5b
4 changed files with 16 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

9
ipc/namespace.c
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@ -11,10 +11,11 @@
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/user_namespace.h>
#include "util.h"
static struct ipc_namespace *create_ipc_ns(void)
static struct ipc_namespace *create_ipc_ns(struct ipc_namespace *old_ns)
{
struct ipc_namespace *ns;
int err;
@ -43,6 +44,9 @@ static struct ipc_namespace *create_ipc_ns(void)
ipcns_notify(IPCNS_CREATED);
register_ipcns_notifier(ns);
ns->user_ns = old_ns->user_ns;
get_user_ns(ns->user_ns);
return ns;
}
@ -50,7 +54,7 @@ struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
{
if (!(flags & CLONE_NEWIPC))
return get_ipc_ns(ns);
return create_ipc_ns();
return create_ipc_ns(ns);
}
/*
@ -105,6 +109,7 @@ static void free_ipc_ns(struct ipc_namespace *ns)
* order to have a correct value when recomputing msgmni.
*/
ipcns_notify(IPCNS_REMOVED);
put_user_ns(ns->user_ns);
}
/*