bool child_random_syscalls(void)
{
struct syscallrecord *rec;
unsigned int syscallnr;
bool do32;
unsigned int len;
retry:
if (no_syscalls_enabled() == TRUE) {
output(0, "[%d] No more syscalls enabled. Exiting\n", getpid());
shm->exit_reason = EXIT_NO_SYSCALLS_ENABLED;
return FAIL;
}
/* Ok, we're doing another syscall, let's pick one. */
do32 = choose_syscall_table();
syscallnr = rand() % max_nr_syscalls;
/* If we got a syscallnr which is not active repeat the attempt,
* since another child has switched that syscall off already.*/
if (active_syscalls[syscallnr] == 0)
goto retry;
syscallnr = active_syscalls[syscallnr] - 1;
if (validate_specific_syscall_silent(syscalls, syscallnr) == FALSE) {
deactivate_syscall(syscallnr, do32);
goto retry;
}
rec = &this_child->syscall;
/* critical section for shm updates. */
lock(&rec->lock);
rec->do32bit = do32;
rec->nr = syscallnr;
unlock(&rec->lock);
if (syscalls_todo) {
if (shm->stats.total_syscalls_done >= syscalls_todo)
shm->exit_reason = EXIT_REACHED_COUNT;
}
/* Generate arguments, print them out */
generate_syscall_args(rec);
output_syscall_prefix(rec);
/* Sanity check: Make sure the length of the buffer remains
* constant across the syscall.
*/
len = strlen(rec->prebuffer);
/* If we're going to pause, might as well sync pre-syscall */
if (dopause == TRUE)
synclogs();
do_syscall(rec);
/* post syscall sanity checks. */
if (len != strlen(rec->prebuffer)) {
output(0, "Sanity check failed: prebuffer length changed from %d to %d.\n",
len, strlen(rec->prebuffer));
}
/* Output the syscall result, and clean up */
output_syscall_postfix(rec);
if (dopause == TRUE)
sleep(1);
handle_syscall_ret(rec);
return TRUE;
}
int child_random_syscalls(int childno)
{
int ret;
unsigned int syscallnr;
ret = sigsetjmp(ret_jump, 1);
if (ret != 0) {
if (handle_sigreturn(childno) == 0)
return 0;
ret = 0;
}
while (shm->exit_reason == STILL_RUNNING) {
check_parent_pid();
while (shm->regenerating == TRUE)
sleep(1);
/* If the parent reseeded, we should reflect the latest seed too. */
if (shm->seed != shm->seeds[childno])
set_seed(childno);
choose_syscall_table(childno);
if (nr_active_syscalls == 0) {
shm->exit_reason = EXIT_NO_SYSCALLS_ENABLED;
goto out;
}
if (shm->exit_reason != STILL_RUNNING)
goto out;
syscallnr = rand() % nr_active_syscalls;
/* If we got a syscallnr which is not actvie repeat the attempt, since another child has switched that syscall off already.*/
if (active_syscalls[syscallnr] == 0)
continue;
syscallnr = active_syscalls[syscallnr] - 1;
if (validate_specific_syscall_silent(syscalls, syscallnr) == FALSE) {
if (biarch == FALSE) {
deactivate_syscall(syscallnr);
} else {
if (shm->do32bit[childno] == TRUE)
deactivate_syscall32(syscallnr);
else
deactivate_syscall64(syscallnr);
}
continue;
}
shm->syscallno[childno] = syscallnr;
if (syscalls_todo) {
if (shm->total_syscalls_done >= syscalls_todo) {
output(0, "Reached maximum syscall count (todo = %d, done = %d), exiting...\n",
syscalls_todo, shm->total_syscalls_done);
shm->exit_reason = EXIT_REACHED_COUNT;
}
}
ret = mkcall(childno);
}
out:
return ret;
}
