void disable_non_net_syscalls_uniarch(void)
{
unsigned int i;
for_each_syscall(i) {
if (validate_specific_syscall_silent(syscalls, i) == FALSE)
continue;
if (syscalls[i].entry->flags & ACTIVE) {
if (is_syscall_net_related(syscalls, i) == FALSE) {
toggle_syscall_n(i, FALSE, syscalls[i].entry->name, syscalls[i].entry->name);
}
}
}
}
void enable_random_syscalls_uniarch(void)
{
unsigned int call;
retry:
call = rand() % max_nr_syscalls;
if (validate_specific_syscall_silent(syscalls, call) == FALSE)
goto retry;
if (no_files == TRUE)
if (is_syscall_net_related(syscalls, call) == FALSE)
goto retry;
/* if we've set this to be disabled, don't enable it! */
if (syscalls[call].entry->flags & TO_BE_DEACTIVATED)
goto retry;
toggle_syscall_n(call, TRUE, syscalls[call].entry->name, syscalls[call].entry->name);
}
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;
}
void enable_random_syscalls_biarch(void)
{
unsigned int call32 = NOTFOUND, call64 = NOTFOUND;
retry:
//Search for 64 bit version
if (do_64_arch) {
struct syscallentry *entry = NULL;
call64 = rnd() % max_nr_64bit_syscalls;
if (validate_specific_syscall_silent(syscalls_64bit, call64) == FALSE)
goto retry;
entry = syscalls_64bit[call64].entry;
if (entry->flags & TO_BE_DEACTIVATED) {
call64 = NOTFOUND;
goto try32bit;
}
if (entry->active_number != 0) {
call64 = NOTFOUND;
goto try32bit;
}
// If we got so far, then activate it.
toggle_syscall_biarch_n(call64, syscalls_64bit, TRUE, do_64_arch, TRUE,
&activate_syscall64, 64, entry->name);
}
try32bit:
//Search for 32 bit version
if (do_32_arch) {
struct syscallentry *entry = NULL;
/* If we enabled a 64bit syscall above, enable its 32-bit counter-part too */
if (do_64_arch) {
if (call64 == NOTFOUND) {
goto just32;
} else {
call32 = search_syscall_table(syscalls_32bit, max_nr_32bit_syscalls, syscalls_64bit[call64].entry->name);
if (call32 == NOTFOUND)
return; // syscall is 64-bit only.
}
} else {
just32:
call32 = rnd() % max_nr_32bit_syscalls;
}
if (validate_specific_syscall_silent(syscalls_32bit, call32) == FALSE)
return;
entry = syscalls_32bit[call32].entry;
if ((entry->flags & TO_BE_DEACTIVATED) || (entry->active_number != 0))
return;
//If we got so far, then active it.
toggle_syscall_biarch_n(call32, syscalls_32bit, TRUE, do_32_arch, TRUE,
&activate_syscall32, 32, entry->name);
}
}
