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#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#define UNUSED_PARAMETER(x) (void)(x)
#define LOG(x) \
do { \
\
char buf[] = x; \
write(STDOUT_FILENO, buf, sizeof(buf)); \
\
} while (false);
void test(char data) {
char *buf = malloc(10);
if (buf == NULL) return;
switch (data) {
/* Underflow */
case 'U':
LOG("Underflow\n");
buf[-1] = '\0';
free(buf);
break;
/* Overflow */
case 'O':
LOG("Overflow\n");
buf[10] = '\0';
free(buf);
break;
/* Double free */
case 'D':
LOG("Double free\n");
free(buf);
free(buf);
break;
/* Use after free */
case 'A':
LOG("Use after free\n");
free(buf);
buf[0] = '\0';
break;
/* Test Limits (OK) */
case 'T':
LOG("Test-Limits - No Error\n");
buf[0] = 'A';
buf[9] = 'I';
free(buf);
break;
case 'M':
LOG("Memset too many\n");
memset(buf, '\0', 11);
free(buf);
break;
default:
LOG("Nop - No Error\n");
break;
}
}
int main(int argc, char **argv) {
UNUSED_PARAMETER(argc);
UNUSED_PARAMETER(argv);
char input = '\0';
if (read(STDIN_FILENO, &input, 1) < 0) {
LOG("Failed to read stdin\n");
return 1;
}
test(input);
LOG("DONE\n");
return 0;
}
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