diff --git a/kernel/umh.c b/kernel/umh.c
index 6ff36a7f038b9367290d9877da2a31221f846384..53611efb10cb4e08d4b50e46d977a74cfd6fc2e7 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -13,6 +13,7 @@
 #include <linux/cred.h>
 #include <linux/file.h>
 #include <linux/fdtable.h>
+#include <linux/fs_struct.h>
 #include <linux/workqueue.h>
 #include <linux/security.h>
 #include <linux/mount.h>
@@ -76,6 +77,14 @@ static int call_usermodehelper_exec_async(void *data)
 	flush_signal_handlers(current, 1);
 	spin_unlock_irq(&current->sighand->siglock);
 
+	/*
+	 * Initial kernel threads share ther FS with init, in order to
+	 * get the init root directory. But we've now created a new
+	 * thread that is going to execve a user process and has its own
+	 * 'struct fs_struct'. Reset umask to the default.
+	 */
+	current->fs->umask = 0022;
+
 	/*
 	 * Kthreadd can be restricted to a set of processors if the user wants
 	 * to protect other processors from OS latencies. If that has happened