mm: memcg: shorten preempt-disabled section around event checks

[karo-tx-linux.git] / ipc / mqueue.c

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 9a142a290749f2af819c47ac487f2192c6502675..9b7c8ab7d75cad27e92272c0a0c81927c9fbaa03 100644 (file)
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -32,6 +32,7 @@
 #include <linux/nsproxy.h>
 #include <linux/pid.h>
 #include <linux/ipc_namespace.h>
+#include <linux/user_namespace.h>
 #include <linux/slab.h>
 
 #include <net/sock.h>
@@ -542,9 +543,13 @@ static void __do_notify(struct mqueue_inode_info *info)
                        sig_i.si_errno = 0;
                        sig_i.si_code = SI_MESGQ;
                        sig_i.si_value = info->notify.sigev_value;
+                       /* map current pid/uid into info->owner's namespaces */
+                       rcu_read_lock();
                        sig_i.si_pid = task_tgid_nr_ns(current,
                                                ns_of_pid(info->notify_owner));
-                       sig_i.si_uid = current_uid();
+                       sig_i.si_uid = user_ns_map_uid(info->user->user_ns,
+                                               current_cred(), current_uid());
+                       rcu_read_unlock();
 
                        kill_pid_info(info->notify.sigev_signo,
                                      &sig_i, info->notify_owner);