userns: user namespaces: convert several capable() calls

CAP_IPC_OWNER and CAP_IPC_LOCK can be checked against current_user_ns(),
because the resource comes from current's own ipc namespace.

setuid/setgid are to uids in own namespace, so again checks can be against
current_user_ns().

Changelog:
	Jan 11: Use task_ns_capable() in place of sched_capable().
	Jan 11: Use nsown_capable() as suggested by Bastian Blank.
	Jan 11: Clarify (hopefully) some logic in futex and sched.c
	Feb 15: use ns_capable for ipc, not nsown_capable
	Feb 23: let copy_ipcs handle setting ipc_ns->user_ns
	Feb 23: pass ns down rather than taking it from current

[akpm@linux-foundation.org: coding-style fixes]
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>

1 files changed, 4 insertions, 4 deletions

diff --git a/ipc/msg.c b/ipc/msg.c
index 747b65507a91..0e732e92e22f 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -421,7 +421,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                         return -EFAULT;
         }
 
-        ipcp = ipcctl_pre_down(&msg_ids(ns), msqid, cmd,
+        ipcp = ipcctl_pre_down(ns, &msg_ids(ns), msqid, cmd,
                                &msqid64.msg_perm, msqid64.msg_qbytes);
         if (IS_ERR(ipcp))
                 return PTR_ERR(ipcp);
@@ -539,7 +539,7 @@ SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
                         success_return = 0;
                 }
                 err = -EACCES;
-                if (ipcperms(&msq->q_perm, S_IRUGO))
+                if (ipcperms(ns, &msq->q_perm, S_IRUGO))
                         goto out_unlock;
 
                 err = security_msg_queue_msgctl(msq, cmd);
@@ -664,7 +664,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
                 struct msg_sender s;
 
                 err = -EACCES;
-                if (ipcperms(&msq->q_perm, S_IWUGO))
+                if (ipcperms(ns, &msq->q_perm, S_IWUGO))
                         goto out_unlock_free;
 
                 err = security_msg_queue_msgsnd(msq, msg, msgflg);
@@ -774,7 +774,7 @@ long do_msgrcv(int msqid, long *pmtype, void __user *mtext,
                 struct list_head *tmp;
 
                 msg = ERR_PTR(-EACCES);
-                if (ipcperms(&msq->q_perm, S_IRUGO))
+                if (ipcperms(ns, &msq->q_perm, S_IRUGO))
                         goto out_unlock;
 
                 msg = ERR_PTR(-EAGAIN);