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// $ ./bufferOverflow -2147482047
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#define MAX_BUF_SZ 1024
int copySize;
int s[MAX_BUF_SZ*2]; // source buffer
int d[MAX_BUF_SZ]; // destination buffer
int c[MAX_BUF_SZ]; // corrupted buffer
void populateBuffer_s(void); // randomly fill buffer
int main(int argc, char** argv)
printf("s[1024] %d c[0] %d\n", s[1024], c[0]);
copySize = atoi(argv[1]);
if(copySize > MAX_BUF_SZ) {
puts("copySize too large");
return -1;
printf("About to copy %u bytes\n", copySize*sizeof(int));
printf("s[1024] %d c[0] %d\n", s[1024], c[0]);
return 0;
void populateBuffer_s(void)
for(int i = 0; i < MAX_BUF_SZ*2; ++i) {
s[i] = rand()*100;
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