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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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6
include/linux/utsname.h
View file

@ -33,7 +33,7 @@ static inline void get_uts_ns(struct uts_namespace *ns)
}
extern struct uts_namespace *copy_utsname(unsigned long flags,
struct task_struct *tsk);
struct user_namespace *user_ns, struct uts_namespace *old_ns);
extern void free_uts_ns(struct kref *kref);
static inline void put_uts_ns(struct uts_namespace *ns)
@ -50,12 +50,12 @@ static inline void put_uts_ns(struct uts_namespace *ns)
}
static inline struct uts_namespace *copy_utsname(unsigned long flags,
struct task_struct *tsk)
struct user_namespace *user_ns, struct uts_namespace *old_ns)
{
if (flags & CLONE_NEWUTS)
return ERR_PTR(-EINVAL);
return tsk->nsproxy->uts_ns;
return old_ns;
}
#endif