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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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7
kernel/nsproxy.c
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@@ -69,16 +69,11 @@ static struct nsproxy *create_new_namespaces(unsigned long flags,
goto out_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 (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)) {