73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
|
/* 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>
|
||
|
|
|
||
|
|
#define MAX_ERROR 1
|
||
|
|
#include "common.c"
|
||
|
|
|
||
|
|
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();
|
||
|
|
}
|