userns: Kill nsown_capable it makes the wrong thing easy

nsown_capable is a special case of ns_capable essentially for just CAP_SETUID and
CAP_SETGID.  For the existing users it doesn't noticably simplify things and
from the suggested patches I have seen it encourages people to do the wrong
thing.  So remove nsown_capable.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 6917e8edb48e..ee1f6bb83d67 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -329,7 +329,7 @@ static int pidns_install(struct nsproxy *nsproxy, void *ns)
         struct pid_namespace *ancestor, *new = ns;
 
         if (!ns_capable(new->user_ns, CAP_SYS_ADMIN) ||
-            !nsown_capable(CAP_SYS_ADMIN))
+            !ns_capable(current_user_ns(), CAP_SYS_ADMIN))
                 return -EPERM;
 
         /*