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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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9
kernel/utsname.c
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@@ -32,7 +32,7 @@ static struct uts_namespace *create_uts_ns(void)
* @old_ns: namespace to clone
* Return NULL on error (failure to kmalloc), new ns otherwise
*/
static struct uts_namespace *clone_uts_ns(struct task_struct *tsk,
static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns,
struct uts_namespace *old_ns)
{
struct uts_namespace *ns;
@@ -43,7 +43,7 @@ static struct uts_namespace *clone_uts_ns(struct task_struct *tsk,
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
ns->user_ns = get_user_ns(task_cred_xxx(tsk, user_ns));
ns->user_ns = get_user_ns(user_ns);
up_read(&uts_sem);
return ns;
}
@@ -55,9 +55,8 @@ static struct uts_namespace *clone_uts_ns(struct task_struct *tsk,
* versa.
*/
struct uts_namespace *copy_utsname(unsigned long flags,
struct task_struct *tsk)
struct user_namespace *user_ns, struct uts_namespace *old_ns)
{
struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
struct uts_namespace *new_ns;
BUG_ON(!old_ns);
@@ -66,7 +65,7 @@ struct uts_namespace *copy_utsname(unsigned long flags,
if (!(flags & CLONE_NEWUTS))
return old_ns;
new_ns = clone_uts_ns(tsk, old_ns);
new_ns = clone_uts_ns(user_ns, old_ns);
put_uts_ns(old_ns);
return new_ns;