blob: 348d0353d605b90727bebf9a196fdf9d00335fe0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/* FPU state corruption test. This used to be able to crash the kernel. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <sys/wait.h>
#include <machine/fpu.h>
int max_error = 1;
#include "common.h"
double state = 2.0;
static int count;
static void use_fpu(int n)
{
state += (double) n * 0.5;
}
static void crashed(int sig)
{
exit(EXIT_SUCCESS);
}
static void handler(int sig, int code, struct sigcontext *sc)
{
memset(&sc->sc_fpu_state, count, sizeof(sc->sc_fpu_state));
}
int main(void)
{
int status;
start(62);
subtest = 0;
signal(SIGUSR1, (void (*)(int)) handler);
/* Initialize the FPU state. This state is inherited, too. */
use_fpu(-1);
for (count = 0; count <= 255; count++) {
switch (fork()) {
case -1:
e(1);
break;
case 0:
signal(SIGFPE, crashed);
/* Load bad state into the kernel. */
if (kill(getpid(), SIGUSR1)) e(2);
/* Let the kernel restore the state. */
use_fpu(count);
exit(EXIT_SUCCESS);
default:
/* We cannot tell exactly whether what happened is correct or
* not -- certainly not in a platform-independent way. However,
* if the whole system keeps running, that's good enough.
*/
(void) wait(&status);
}
}
if (state <= 1.4 || state >= 1.6) e(3);
quit();
return 0;
}
|
