From 93fcc6a9780e45af260aedc0a2c96b7ca247260e Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Wed, 3 Oct 2018 17:15:38 -0400
Subject: [PATCH] add simple string overflow test

---
 test/simple-memory-corruption/Makefile        |  1 +
 .../string_overflow.c                         | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 test/simple-memory-corruption/string_overflow.c

diff --git a/test/simple-memory-corruption/Makefile b/test/simple-memory-corruption/Makefile
index d3e35d7..98b0564 100644
--- a/test/simple-memory-corruption/Makefile
+++ b/test/simple-memory-corruption/Makefile
@@ -20,6 +20,7 @@ EXECUTABLES := \
     uninitialized_malloc_usable_size \
     eight_byte_overflow_small \
     eight_byte_overflow_large \
+    string_overflow
 
 all: $(EXECUTABLES)
 
diff --git a/test/simple-memory-corruption/string_overflow.c b/test/simple-memory-corruption/string_overflow.c
new file mode 100644
index 0000000..fe89fa5
--- /dev/null
+++ b/test/simple-memory-corruption/string_overflow.c
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <malloc.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+
+    size_t size = malloc_usable_size(p);
+    memset(p, 'a', size);
+    printf("overflow by %zu bytes\n", strlen(p) - size);
+
+    return 0;
+}