diff --git a/sys/ld/main.c b/sys/ld/main.c
index 5926984..747f339 100644
--- a/sys/ld/main.c
+++ b/sys/ld/main.c
@@ -2,6 +2,9 @@
 #include <mango/msg.h>
 #include <mango/types.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 int main(
 	int argc,
@@ -11,6 +14,17 @@ int main(
 	uintptr_t bsp_base)
 {
 	kern_log("ld!");
+	void *brk = sbrk(0);
+	kern_logf("brk=%p", brk);
+
+	void *buf = malloc(64);
+	if (buf) {
+		memset(buf, 0x0, 64);
+		kern_logf("allocated 64 bytes at %p", buf);
+	} else {
+		kern_logf("malloc() failed");
+	}
+
 	kern_handle_t port;
 	kern_status_t status = port_create(&port);
 	if (status != KERN_OK) {