X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=kernel%2Fuser_namespace.c;h=88fefa68c5164c88e5ec2487c942b15e3914666b;hb=17447717a3266965e257d3eae79d89539ce3ec0a;hp=4109f8320684a81af4cd9d0c7262f83812c300f2;hpb=4ba24fef3eb3b142197135223b90ced2f319cd53;p=cascardo%2Flinux.git

diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 4109f8320684..88fefa68c516 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -39,6 +39,7 @@ static void set_cred_user_ns(struct cred *cred, struct user_namespace *user_ns)
 	cred->cap_inheritable = CAP_EMPTY_SET;
 	cred->cap_permitted = CAP_FULL_SET;
 	cred->cap_effective = CAP_FULL_SET;
+	cred->cap_ambient = CAP_EMPTY_SET;
 	cred->cap_bset = CAP_FULL_SET;
 #ifdef CONFIG_KEYS
 	key_put(cred->request_key_auth);
@@ -976,8 +977,8 @@ static int userns_install(struct nsproxy *nsproxy, struct ns_common *ns)
 	if (user_ns == current_user_ns())
 		return -EINVAL;
 
-	/* Threaded processes may not enter a different user namespace */
-	if (atomic_read(&current->mm->mm_users) > 1)
+	/* Tasks that share a thread group must share a user namespace */
+	if (!thread_group_empty(current))
 		return -EINVAL;
 
 	if (current->fs->users != 1)