X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=kernel%2Fpid_namespace.c;h=4918314893bc6620ae95660c78588d6d5ac9129c;hb=2554db916586b228ce93e6f74a12fd7fe430a004;hp=74a5a7255b4d9cb473cc7708d851c64402cca942;hpb=dc502142b65b9e31eb90ab4344b3acadb2698317;p=linux.git

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 74a5a7255b4d..4918314893bc 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -101,6 +101,10 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
 	int i;
 	int err;
 
+	err = -EINVAL;
+	if (!in_userns(parent_pid_ns->user_ns, user_ns))
+		goto out;
+
 	err = -ENOSPC;
 	if (level > MAX_PID_NS_LEVEL)
 		goto out;