Changelog:
Feb 23: let clone_uts_ns() handle setting uts->user_ns
To do so we need to pass in the task_struct who'll
get the utsname, so we can get its user_ns.
Feb 23: As per Oleg's coment, just pass in tsk, instead of two
of its members.
Signed-off-by: Serge E. Hallyn <serge.hallyn@canonical.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Acked-by: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
}
extern struct uts_namespace *copy_utsname(unsigned long flags,
}
extern struct uts_namespace *copy_utsname(unsigned long flags,
- struct uts_namespace *ns);
+ struct task_struct *tsk);
extern void free_uts_ns(struct kref *kref);
static inline void put_uts_ns(struct uts_namespace *ns)
extern void free_uts_ns(struct kref *kref);
static inline void put_uts_ns(struct uts_namespace *ns)
}
static inline struct uts_namespace *copy_utsname(unsigned long flags,
}
static inline struct uts_namespace *copy_utsname(unsigned long flags,
- struct uts_namespace *ns)
+ struct task_struct *tsk)
{
if (flags & CLONE_NEWUTS)
return ERR_PTR(-EINVAL);
{
if (flags & CLONE_NEWUTS)
return ERR_PTR(-EINVAL);
+ return tsk->nsproxy->uts_ns;
- new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns);
+ new_nsp->uts_ns = copy_utsname(flags, tsk);
if (IS_ERR(new_nsp->uts_ns)) {
err = PTR_ERR(new_nsp->uts_ns);
goto out_uts;
}
if (IS_ERR(new_nsp->uts_ns)) {
err = PTR_ERR(new_nsp->uts_ns);
goto out_uts;
}
- if (new_nsp->uts_ns != tsk->nsproxy->uts_ns) {
- put_user_ns(new_nsp->uts_ns->user_ns);
- new_nsp->uts_ns->user_ns = task_cred_xxx(tsk, user)->user_ns;
- get_user_ns(new_nsp->uts_ns->user_ns);
- }
new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
if (IS_ERR(new_nsp->ipc_ns)) {
new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
if (IS_ERR(new_nsp->ipc_ns)) {
int errno;
char tmp[__NEW_UTS_LEN];
int errno;
char tmp[__NEW_UTS_LEN];
- if (!capable(CAP_SYS_ADMIN))
+ if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
return -EPERM;
if (len < 0 || len > __NEW_UTS_LEN)
return -EINVAL;
return -EPERM;
if (len < 0 || len > __NEW_UTS_LEN)
return -EINVAL;
* @old_ns: namespace to clone
* Return NULL on error (failure to kmalloc), new ns otherwise
*/
* @old_ns: namespace to clone
* Return NULL on error (failure to kmalloc), new ns otherwise
*/
-static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
+static struct uts_namespace *clone_uts_ns(struct task_struct *tsk,
+ struct uts_namespace *old_ns)
{
struct uts_namespace *ns;
{
struct uts_namespace *ns;
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
- ns->user_ns = old_ns->user_ns;
- get_user_ns(ns->user_ns);
+ ns->user_ns = get_user_ns(task_cred_xxx(tsk, user)->user_ns);
up_read(&uts_sem);
return ns;
}
up_read(&uts_sem);
return ns;
}
* utsname of this process won't be seen by parent, and vice
* versa.
*/
* utsname of this process won't be seen by parent, and vice
* versa.
*/
-struct uts_namespace *copy_utsname(unsigned long flags, struct uts_namespace *old_ns)
+struct uts_namespace *copy_utsname(unsigned long flags,
+ struct task_struct *tsk)
+ struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
struct uts_namespace *new_ns;
BUG_ON(!old_ns);
struct uts_namespace *new_ns;
BUG_ON(!old_ns);
if (!(flags & CLONE_NEWUTS))
return old_ns;
if (!(flags & CLONE_NEWUTS))
return old_ns;
- new_ns = clone_uts_ns(old_ns);
+ new_ns = clone_uts_ns(tsk, old_ns);
put_uts_ns(old_ns);
return new_ns;
put_uts_ns(old_ns);
return new_ns;