cmd/earlyinit: mount /dev/shm

Required by many programs.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/earlyinit/main.go

@@ -137,6 +137,14 @@ func main() {
 		MS_NOSUID|MS_NOEXEC,
 		"mode=620,ptmxmode=666",
 	))
+	must(os.Mkdir("/dev/shm/", 0))
+	mustSyscall("mount shm", Mount(
+		"shm",
+		"/dev/shm/",
+		"tmpfs",
+		MS_NOSUID|MS_NODEV,
+		"",
+	))
 
 	// The kernel might be unable to set up the console. When that happens,
 	// printk is called with "Warning: unable to open an initial console."