From 783291e6900292521a3895583785e0c04a56c5b3 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 17 Nov 2011 01:32:59 -0800 Subject: userns: Simplify the user_namespace by making userns->creator a kuid. - Transform userns->creator from a user_struct reference to a simple kuid_t, kgid_t pair. In cap_capable this allows the check to see if we are the creator of a namespace to become the classic suser style euid permission check. This allows us to remove the need for a struct cred in the mapping functions and still be able to dispaly the user namespace creators uid and gid as 0. - Remove the now unnecessary delayed_work in free_user_ns. All that is left for free_user_ns to do is to call kmem_cache_free and put_user_ns. Those functions can be called in any context so call them directly from free_user_ns removing the need for delayed work. Acked-by: Serge Hallyn Signed-off-by: Eric W. Biederman --- security/commoncap.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'security/commoncap.c') diff --git a/security/commoncap.c b/security/commoncap.c index 435d074853f..f2399d8afbe 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -76,8 +76,9 @@ int cap_capable(const struct cred *cred, struct user_namespace *targ_ns, int cap, int audit) { for (;;) { - /* The creator of the user namespace has all caps. */ - if (targ_ns != &init_user_ns && targ_ns->creator == cred->user) + /* The owner of the user namespace has all caps. */ + if (targ_ns != &init_user_ns && uid_eq(targ_ns->owner, + make_kuid(cred->user_ns, cred->euid))) return 0; /* Do we have the necessary capabilities? */ -- cgit v1.2.3