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userns: allow sethostname in a container

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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>
This commit is contained in:
Serge E. Hallyn 2011-03-23 16:43:18 -07:00 • committed by Linus Torvalds
parent 3486740a4f
commit bb96a6f50b
4 changed files with 12 additions and 15 deletions
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6
include/linux/utsname.h
View file

@ -54,7 +54,7 @@ static inline void get_uts_ns(struct uts_namespace *ns)
}
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)
@ -71,12 +71,12 @@ static inline void put_uts_ns(struct uts_namespace *ns)
}
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);
return ns;
return tsk->nsproxy->uts_ns;
}
#endif