#include <string.h>
#include <stdlib.h>
+
+// We need a way to prevent the optimize from eliminating the
+// strncpy below (which otherwises writes to dead storage). We
+// need the read to be out-of-line to prevent memory forwarding
+// from making the memory dead again.
+int sink_memory(int N, char *p) __attribute__((noinline));
+int sink_memory(int N, char *p) {
+ int sum = 0;
+ for (int i = 0; i < N; i++)
+ sum += p[i];
+ return sum;
+}
+
int main(int argc, char **argv) {
char *hello = (char*)malloc(6);
strcpy(hello, "hello");
+ int rval = sink_memory(6, hello);
char *short_buffer = (char*)malloc(9);
strncpy(short_buffer, hello, 10); // BOOM
// CHECK: {{WRITE of size 10 at 0x.* thread T0}}
// CHECK: {{allocated by thread T0 here:}}
// CHECK: {{ #0 0x.* in .*malloc}}
// CHECK: {{ #1 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-8]]
- return short_buffer[8];
+ return rval + sink_memory(9, short_buffer);
}