1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
#include <stdio.h>
__attribute__((noinline)) void big(void)
{
/* The below ensures the stack grows a lot. However, we hope the stack
extension is not done yet, as no memory has been read/written. */
volatile char c[200000];
/* Access only the higher part of the stack, to avoid mapping SP */
/* The below 2 printfs should produce deterministic output, whatever
the random value of c[]. */
if (c[200000 - 1])
fprintf(stderr, "Accessing fresh %s\n", "stack");
else
fprintf(stderr, "Accessing %s stack\n", "fresh");
}
int main(void )
{
big();
return 0;
}
|
