add initial simple memory corruption tests

test/simple-memory-corruption/Makefile

@@ -0,0 +1,11 @@
+all: \
+    double_free_large \
+    double_free_small \
+    unaligned_free_large \
+    unaligned_free_small \
+    read_after_free_large \
+    read_after_free_small \
+    write_after_free_large \
+    write_after_free_small \
+    read_zero_size \
+    write_zero_size \

test/simple-memory-corruption/double_free_large.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    void *p = malloc(128 * 1024);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    free(p);
+    return 0;
+}

test/simple-memory-corruption/double_free_small.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    void *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    free(p);
+    return 0;
+}

test/simple-memory-corruption/read_after_free_large.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(128 * 1024);
+    if (!p) {
+        return 1;
+    }
+    memset(p, 'a', 16);
+    free(p);
+    for (size_t i = 0; i < 128 * 1024; i++) {
+        printf("%x\n", p[i]);
+    }
+    return 0;
+}

test/simple-memory-corruption/read_after_free_small.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    memset(p, 'a', 16);
+    free(p);
+    for (size_t i = 0; i < 16; i++) {
+        printf("%x\n", p[i]);
+    }
+    return 0;
+}

test/simple-memory-corruption/read_zero_size.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(0);
+    if (!p) {
+        return 1;
+    }
+    printf("%c\n", *p);
+    return 0;
+}

test/simple-memory-corruption/unaligned_free_large.c

@@ -0,0 +1,11 @@
+#include <stdlib.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(128 * 1024);
+    if (!p) {
+        return 1;
+    }
+    free(p + 1);
+    return 0;
+}

test/simple-memory-corruption/unaligned_free_small.c

@@ -0,0 +1,11 @@
+#include <stdlib.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    free(p + 1);
+    return 0;
+}

test/simple-memory-corruption/write_after_free_large.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(128 * 1024);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    memset(p, 'a', 128 * 1024);
+    return 0;
+}

test/simple-memory-corruption/write_after_free_small.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(16);
+    if (!p) {
+        return 1;
+    }
+    free(p);
+    memset(p, 'a', 16);
+    return 0;
+}

test/simple-memory-corruption/write_zero_size.c

@@ -0,0 +1,12 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+__attribute__((optimize(0)))
+int main(void) {
+    char *p = malloc(0);
+    if (!p) {
+        return 1;
+    }
+    *p = 5;
+    return 0;
+}