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userns: Make create_new_namespaces take a user_ns parameter

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Modify create_new_namespaces to explicitly take a user namespace
parameter, instead of implicitly through the task_struct.

This allows an implementation of unshare(CLONE_NEWUSER) where
the new user namespace is not stored onto the current task_struct
until after all of the namespaces are created.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2012-07-26 04:02:49 -07:00
parent 142e1d1d5f
commit bcf58e725d
5 changed files with 28 additions and 26 deletions
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10
ipc/namespace.c
View File

@@ -16,7 +16,7 @@
#include "util.h"
static struct ipc_namespace *create_ipc_ns(struct task_struct *tsk,
static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
struct ipc_namespace *old_ns)
{
struct ipc_namespace *ns;
@@ -46,19 +46,17 @@ static struct ipc_namespace *create_ipc_ns(struct task_struct *tsk,
ipcns_notify(IPCNS_CREATED);
register_ipcns_notifier(ns);
ns->user_ns = get_user_ns(task_cred_xxx(tsk, user_ns));
ns->user_ns = get_user_ns(user_ns);
return ns;
}
struct ipc_namespace *copy_ipcs(unsigned long flags,
struct task_struct *tsk)
struct user_namespace *user_ns, struct ipc_namespace *ns)
{
struct ipc_namespace *ns = tsk->nsproxy->ipc_ns;
if (!(flags & CLONE_NEWIPC))
return get_ipc_ns(ns);
return create_ipc_ns(tsk, ns);
return create_ipc_ns(user_ns, ns);
}
/*