bool
cap_sandboxed(void)
{
u_int mode;
if (cap_getmode(&mode) != 0) {
assert(errno == ENOSYS);
return (false);
}
assert(mode == 0 || mode == 1);
return (mode == 1);
}
int
main(void)
{
unsigned int mode;
pid_t pid;
int pfd;
printf("1..27\n");
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are not in capability mode. */
CHECK(mode == 0);
/* Expect EFAULT. */
errno = 0;
CHECK(cap_getmode(NULL) == -1);
CHECK(errno == EFAULT);
errno = 0;
CHECK(cap_getmode((void *)(uintptr_t)0xdeadc0de) == -1);
CHECK(errno == EFAULT);
/* If parent is not in capability mode, child after fork() also won't be. */
pid = fork();
switch (pid) {
case -1:
err(1, "fork() failed");
case 0:
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are not in capability mode. */
CHECK(mode == 0);
exit(0);
default:
if (waitpid(pid, NULL, 0) == -1)
err(1, "waitpid() failed");
}
/* If parent is not in capability mode, child after pdfork() also won't be. */
pid = pdfork(&pfd, 0);
switch (pid) {
case -1:
err(1, "pdfork() failed");
case 0:
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are not in capability mode. */
CHECK(mode == 0);
exit(0);
default:
if (pdwait(pfd) == -1)
err(1, "pdwait() failed");
close(pfd);
}
/* In capability mode... */
CHECK(cap_enter() == 0);
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are in capability mode. */
CHECK(mode == 1);
/* Expect EFAULT. */
errno = 0;
CHECK(cap_getmode(NULL) == -1);
CHECK(errno == EFAULT);
errno = 0;
CHECK(cap_getmode((void *)(uintptr_t)0xdeadc0de) == -1);
CHECK(errno == EFAULT);
/* If parent is in capability mode, child after fork() also will be. */
pid = fork();
switch (pid) {
case -1:
err(1, "fork() failed");
case 0:
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are in capability mode. */
CHECK(mode == 1);
exit(0);
default:
/*
* wait(2) and friends are not permitted in the capability mode,
* so we can only just wait for a while.
*/
sleep(1);
}
/* If parent is in capability mode, child after pdfork() also will be. */
pid = pdfork(&pfd, 0);
switch (pid) {
case -1:
err(1, "pdfork() failed");
case 0:
mode = 666;
CHECK(cap_getmode(&mode) == 0);
/* If cap_getmode() succeeded mode should be modified. */
CHECK(mode != 666);
/* We are in capability mode. */
CHECK(mode == 1);
exit(0);
default:
if (pdwait(pfd) == -1)
err(1, "pdwait() failed");
close(pfd);
}
exit(0);
}