/* Returns 1 if Data Execution Prevention is present and working */
static int AttemptToExecuteData()
{
int result;
char *thunk_buffer = g_malloc(64);
nacl_void_thunk thunk;
/* d'b: small fixes */
if(thunk_buffer == NULL) return 0;
thunk = GenerateThunk(thunk_buffer, 64);
setup_signals();
if(0 == sigsetjmp(try_state, 1))
{
thunk();
result = 0;
}
else
{
result = 1;
}
restore_signals();
g_free(thunk_buffer);
return result;
}
int main(int argc, char *argv[])
{
int sockfd,r=0;
if (argc != 3) {
fprintf(stderr,"usage: %s server_hostname_or_ip port\n",argv[0]);
return 1;
}
if(init_signals()==-1) {
return 1;
}
sockfd=connect_to(argv[1],argv[2]);
if(sockfd==INVALID_SOCKET) {
return 1;
}
if(get_file(sockfd)==-1) {
r=1;
}
if(close(sockfd)==-1) {
perror("close");
r=1;
}
if(restore_signals()==-1) {
r=1;
}
return r;
}
int initialize_signals()
{
struct sigaction sa;
for (size_t i = 0; i < sizeof(signals_used)/sizeof(signals_used[0]); i++)
{
if (!sd_is_handler_registered(signals_used[i].port_sig) &&
signals_used[i].signal != SIGSEGV) // Sigsegv is needed for port_memaccess
continue;
sigemptyset(&sa.sa_mask);
sa.sa_flags = signals_used[i].flags;
sa.sa_sigaction = &general_signal_handler;
if (0 != sigaction(signals_used[i].signal, &sa, &old_actions[i]))
{
restore_signals();
return -1;
}
signals_used[i].set_up = true;
}
for (size_t j = 0; j < sizeof(signals_other)/sizeof(signals_other[0]); j++)
{
old_handlers[j] = signal(signals_other[j].signal, signals_other[j].handler);
if (old_handlers[j] == SIG_ERR)
{
restore_signals();
return -1;
}
signals_other[j].set_up = true;
}
// Prepare gdb crash handler
if (!init_gdb_crash_handler())
{
restore_signals();
return -1;
}
return 0;
} //initialize_signals
int
thr_sigsetmask(int how, const sigset_t *set, sigset_t *oset)
{
ulwp_t *self = curthread;
sigset_t saveset;
if (set == NULL) {
enter_critical(self);
if (oset != NULL)
*oset = self->ul_sigmask;
exit_critical(self);
} else {
switch (how) {
case SIG_BLOCK:
case SIG_UNBLOCK:
case SIG_SETMASK:
break;
default:
return (EINVAL);
}
/*
* The assignments to self->ul_sigmask must be protected from
* signals. The nuances of this code are subtle. Be careful.
*/
block_all_signals(self);
if (oset != NULL)
saveset = self->ul_sigmask;
switch (how) {
case SIG_BLOCK:
self->ul_sigmask.__sigbits[0] |= set->__sigbits[0];
self->ul_sigmask.__sigbits[1] |= set->__sigbits[1];
self->ul_sigmask.__sigbits[2] |= set->__sigbits[2];
self->ul_sigmask.__sigbits[3] |= set->__sigbits[3];
break;
case SIG_UNBLOCK:
self->ul_sigmask.__sigbits[0] &= ~set->__sigbits[0];
self->ul_sigmask.__sigbits[1] &= ~set->__sigbits[1];
self->ul_sigmask.__sigbits[2] &= ~set->__sigbits[2];
self->ul_sigmask.__sigbits[3] &= ~set->__sigbits[3];
break;
case SIG_SETMASK:
self->ul_sigmask.__sigbits[0] = set->__sigbits[0];
self->ul_sigmask.__sigbits[1] = set->__sigbits[1];
self->ul_sigmask.__sigbits[2] = set->__sigbits[2];
self->ul_sigmask.__sigbits[3] = set->__sigbits[3];
break;
}
delete_reserved_signals(&self->ul_sigmask);
if (oset != NULL)
*oset = saveset;
restore_signals(self);
}
return (0);
}
/*
* Threads restoration via sigreturn. Note it's locked
* routine and calls for unlock at the end.
*/
long __export_restore_thread(struct thread_restore_args *args)
{
struct rt_sigframe *rt_sigframe;
k_rtsigset_t to_block;
unsigned long new_sp;
int my_pid = sys_gettid();
int ret;
if (my_pid != args->pid) {
pr_err("Thread pid mismatch %d/%d\n", my_pid, args->pid);
goto core_restore_end;
}
/* All signals must be handled by thread leader */
ksigfillset(&to_block);
ret = sys_sigprocmask(SIG_SETMASK, &to_block, NULL, sizeof(k_rtsigset_t));
if (ret) {
pr_err("Unable to block signals %d", ret);
goto core_restore_end;
}
rt_sigframe = (void *)args->mem_zone.rt_sigframe;
if (restore_thread_common(rt_sigframe, args))
goto core_restore_end;
ret = restore_creds(&args->ta->creds);
if (ret)
goto core_restore_end;
ret = restore_dumpable_flag(&args->ta->mm);
if (ret)
goto core_restore_end;
pr_info("%ld: Restored\n", sys_gettid());
restore_finish_stage(CR_STATE_RESTORE);
if (restore_signals(args->siginfo, args->siginfo_nr, false))
goto core_restore_end;
restore_finish_stage(CR_STATE_RESTORE_SIGCHLD);
restore_pdeath_sig(args);
restore_finish_stage(CR_STATE_RESTORE_CREDS);
futex_dec_and_wake(&thread_inprogress);
new_sp = (long)rt_sigframe + SIGFRAME_OFFSET;
rst_sigreturn(new_sp);
core_restore_end:
pr_err("Restorer abnormal termination for %ld\n", sys_getpid());
futex_abort_and_wake(&task_entries->nr_in_progress);
sys_exit_group(1);
return -1;
}
VALUE furnsh(int argc, VALUE *argv, VALUE self) {
sigset_t old_mask = block_signals();
furnsh_c(StringValuePtr(argv[0]));
restore_signals(old_mask);
if(spice_error(SHORT)) return Qfalse;
return Qtrue;
}
static VALUE unload(VALUE self, VALUE kernel) {
sigset_t old_mask = block_signals();
unload_c(StringValuePtr(kernel));
restore_signals(old_mask);
if(spice_error(SPICE_ERROR_SHORT)) return Qfalse;
return Qtrue;
}
/** Initializes all ncurses' related stuff (windows, colors...).
* There's no need to call 'engine_exit' */
bool engine_init()
{
/* signals during initialization */
block_signals();
engine_screen_init(80, 24);
engine_windows_init();
engine_keymap(NULL);
restore_signals();
register_signal_handler();
return true;
}
void
xmutex_unlock(struct xmutex * lock, sigset_t sigset)
{
TRACE(MUTEX, "thread %d:%d is unlocking %p\n",
sys_getpid(), sys_gettid(), lock);
/* atomic_dec(&lock->val) != 1 */
if (!atomic_dec_and_test(&lock->val)) {
atomic_set(&lock->val, 0);
futex_wake(&lock->val, 1);
}
restore_signals(sigset);
TRACE(MUTEX, "thread %d:%d unlocked %p\n",
sys_getpid(), sys_gettid(), lock);
}
/*
* Returns 1 if Data Execution Prevention is present and working.
*/
int NaClAttemptToExecuteData() {
int result;
char *thunk_buffer = malloc(64);
nacl_void_thunk thunk = NaClGenerateThunk(thunk_buffer, 64);
setup_signals();
if (0 == sigsetjmp(try_state, 1)) {
thunk();
result = 0;
} else {
result = 1;
}
restore_signals();
return result;
}
/*
* Threads restoration via sigreturn. Note it's locked
* routine and calls for unlock at the end.
*/
long __export_restore_thread(struct thread_restore_args *args)
{
struct rt_sigframe *rt_sigframe;
unsigned long new_sp;
int my_pid = sys_gettid();
int ret;
if (my_pid != args->pid) {
pr_err("Thread pid mismatch %d/%d\n", my_pid, args->pid);
goto core_restore_end;
}
rt_sigframe = (void *)args->mem_zone.rt_sigframe + 8;
if (restore_thread_common(rt_sigframe, args))
goto core_restore_end;
mutex_unlock(&args->ta->rst_lock);
ret = restore_creds(&args->ta->creds);
if (ret)
goto core_restore_end;
pr_info("%ld: Restored\n", sys_gettid());
restore_finish_stage(CR_STATE_RESTORE);
if (restore_signals(args->siginfo, args->siginfo_nr, false))
goto core_restore_end;
restore_finish_stage(CR_STATE_RESTORE_SIGCHLD);
restore_finish_stage(CR_STATE_RESTORE_CREDS);
futex_dec_and_wake(&thread_inprogress);
new_sp = (long)rt_sigframe + SIGFRAME_OFFSET;
ARCH_RT_SIGRETURN(new_sp);
core_restore_end:
pr_err("Restorer abnormal termination for %ld\n", sys_getpid());
futex_abort_and_wake(&task_entries->nr_in_progress);
sys_exit_group(1);
return -1;
}
int NaClAttemptToExecuteDataAtAddr(char *thunk_buffer, size_t size) {
int result;
MachExceptionHandlerData saved_handlers;
nacl_void_thunk thunk = NaClGenerateThunk(thunk_buffer, size);
setup_signals();
DisableMachExceptionHandler(&saved_handlers);
if (0 == sigsetjmp(try_state, 1)) {
thunk();
result = 0;
} else {
result = 1;
}
EnableMachExceptionHandler(&saved_handlers);
restore_signals();
return result;
}
int main(int argc, char* argv[])
{
// parse options
addpd::options options(argc, argv);
// create server
server s(options.port(), options.multicast());
// run server in background thread
sigset_t sigmask = block_signals();
boost::thread t(boost::bind(&server::run, &s));
restore_signals(sigmask);
// wait for signal to terminate
wait_for_signal();
// stop the server
s.stop();
t.join();
return 0;
}
void shell_out(void){
char *comspec;
#ifndef __TURBOC__
char key;
int val;
char *str;
#endif /* __TURBOC__ */
save_screen();
clear_screen();
puts("[Entering DOS shell, type exit to return to game.]");
msdos_noraw();
ignore_signals();
if((comspec=getenv("COMSPEC")) ==NULL ||
spawnl(P_WAIT,comspec,comspec,(char *)NULL)<0){
puts("Sorry, there seems to be a problem with shell_out()");
printf("comspec = %s\n",comspec);
flush();
puts("Hit a key to continue");
while(!kbhit())
;
}
restore_signals();
restore_screen();
}
void julia_init(char *imageFile)
{
(void)uv_default_loop();
restore_signals(); //XXX: this needs to be early in load process
jl_page_size = sysconf(_SC_PAGESIZE);
jl_find_stack_bottom();
jl_dl_handle = jl_load_dynamic_library(NULL);
#if defined(__linux__)
int ncores = jl_cpu_cores();
if (ncores > 1) {
cpu_set_t cpumask;
CPU_ZERO(&cpumask);
for(int i=0; i < ncores; i++) {
CPU_SET(i, &cpumask);
}
sched_setaffinity(0, sizeof(cpu_set_t), &cpumask);
}
#endif
#ifdef JL_GC_MARKSWEEP
jl_gc_init();
jl_gc_disable();
#endif
jl_init_frontend();
jl_init_types();
jl_init_tasks(jl_stack_lo, jl_stack_hi-jl_stack_lo);
jl_init_codegen();
jl_an_empty_cell = (jl_value_t*)jl_alloc_cell_1d(0);
jl_init_serializer();
if (!imageFile) {
jl_main_module = jl_new_module(jl_symbol("Main"));
jl_main_module->parent = jl_main_module;
jl_core_module = jl_new_module(jl_symbol("Core"));
jl_core_module->parent = jl_main_module;
jl_set_const(jl_main_module, jl_symbol("Core"),
(jl_value_t*)jl_core_module);
jl_module_using(jl_main_module, jl_core_module);
jl_current_module = jl_core_module;
jl_init_intrinsic_functions();
jl_init_primitives();
jl_load("boot.jl");
jl_get_builtin_hooks();
jl_boot_file_loaded = 1;
jl_init_box_caches();
}
if (imageFile) {
JL_TRY {
jl_restore_system_image(imageFile);
}
JL_CATCH {
JL_PRINTF(JL_STDERR, "error during init:\n");
jl_show(jl_stderr_obj(), jl_exception_in_transit);
JL_PRINTF(JL_STDOUT, "\n");
jl_exit(1);
}
}
// set module field of primitive types
int i;
void **table = jl_core_module->bindings.table;
for(i=1; i < jl_core_module->bindings.size; i+=2) {
if (table[i] != HT_NOTFOUND) {
jl_binding_t *b = (jl_binding_t*)table[i];
if (b->value && jl_is_some_tag_type(b->value)) {
jl_tag_type_t *tt = (jl_tag_type_t*)b->value;
tt->name->module = jl_core_module;
}
}
}
// the Main module is the one which is always open, and set as the
// current module for bare (non-module-wrapped) toplevel expressions.
// it does "using Base" if Base is available.
if (jl_base_module != NULL)
jl_module_using(jl_main_module, jl_base_module);
jl_current_module = jl_main_module;
#ifndef __WIN32__
struct sigaction actf;
memset(&actf, 0, sizeof(struct sigaction));
sigemptyset(&actf.sa_mask);
actf.sa_handler = fpe_handler;
actf.sa_flags = 0;
if (sigaction(SIGFPE, &actf, NULL) < 0) {
JL_PRINTF(JL_STDERR, "sigaction: %s\n", strerror(errno));
jl_exit(1);
}
stack_t ss;
ss.ss_flags = 0;
ss.ss_size = SIGSTKSZ;
ss.ss_sp = malloc(ss.ss_size);
if (sigaltstack(&ss, NULL) < 0) {
JL_PRINTF(JL_STDERR, "sigaltstack: %s\n", strerror(errno));
jl_exit(1);
}
struct sigaction act;
memset(&act, 0, sizeof(struct sigaction));
sigemptyset(&act.sa_mask);
act.sa_sigaction = segv_handler;
act.sa_flags = SA_ONSTACK | SA_SIGINFO;
if (sigaction(SIGSEGV, &act, NULL) < 0) {
JL_PRINTF(JL_STDERR, "sigaction: %s\n", strerror(errno));
jl_exit(1);
}
#endif
atexit(jl_atexit_hook);
#ifdef JL_GC_MARKSWEEP
jl_gc_enable();
#endif
}
/*
* The main routine to restore task via sigreturn.
* This one is very special, we never return there
* but use sigreturn facility to restore core registers
* and jump execution to some predefined ip read from
* core file.
*/
long __export_restore_task(struct task_restore_core_args *args)
{
long ret = -1;
VmaEntry *vma_entry;
u64 va;
unsigned long premmapped_end = args->premmapped_addr + args->premmapped_len;
struct rt_sigframe *rt_sigframe;
unsigned long new_sp;
pid_t my_pid = sys_getpid();
rt_sigaction_t act;
task_entries = args->task_entries;
ksigfillset(&act.rt_sa_mask);
act.rt_sa_handler = sigchld_handler;
act.rt_sa_flags = SA_SIGINFO | SA_RESTORER | SA_RESTART;
act.rt_sa_restorer = cr_restore_rt;
sys_sigaction(SIGCHLD, &act, NULL, sizeof(k_rtsigset_t));
log_set_fd(args->logfd);
log_set_loglevel(args->loglevel);
cap_last_cap = args->cap_last_cap;
pr_info("Switched to the restorer %d\n", my_pid);
for (vma_entry = args->self_vmas; vma_entry->start != 0; vma_entry++) {
unsigned long addr = vma_entry->start;
unsigned long len;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
pr_debug("Examine %"PRIx64"-%"PRIx64"\n", vma_entry->start, vma_entry->end);
if (addr < args->premmapped_addr) {
if (vma_entry->end >= args->premmapped_addr)
len = args->premmapped_addr - addr;
else
len = vma_entry->end - vma_entry->start;
if (sys_munmap((void *) addr, len)) {
pr_err("munmap fail for %lx - %lx\n", addr, addr + len);
goto core_restore_end;
}
}
if (vma_entry->end >= TASK_SIZE)
continue;
if (vma_entry->end > premmapped_end) {
if (vma_entry->start < premmapped_end)
addr = premmapped_end;
len = vma_entry->end - addr;
if (sys_munmap((void *) addr, len)) {
pr_err("munmap fail for %lx - %lx\n", addr, addr + len);
goto core_restore_end;
}
}
}
sys_munmap(args->self_vmas,
((void *)(vma_entry + 1) - ((void *)args->self_vmas)));
/* Shift private vma-s to the left */
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (!vma_priv(vma_entry))
continue;
if (vma_entry->end >= TASK_SIZE)
continue;
if (vma_entry->start > vma_entry->shmid)
break;
if (vma_remap(vma_premmaped_start(vma_entry),
vma_entry->start, vma_entry_len(vma_entry)))
goto core_restore_end;
}
/* Shift private vma-s to the right */
for (vma_entry = args->tgt_vmas + args->nr_vmas -1;
vma_entry >= args->tgt_vmas; vma_entry--) {
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (!vma_priv(vma_entry))
continue;
if (vma_entry->start > TASK_SIZE)
continue;
if (vma_entry->start < vma_entry->shmid)
break;
if (vma_remap(vma_premmaped_start(vma_entry),
vma_entry->start, vma_entry_len(vma_entry)))
goto core_restore_end;
}
/*
* OK, lets try to map new one.
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (vma_priv(vma_entry))
continue;
va = restore_mapping(vma_entry);
if (va != vma_entry->start) {
pr_err("Can't restore %"PRIx64" mapping with %"PRIx64"\n", vma_entry->start, va);
goto core_restore_end;
}
}
/*
* Walk though all VMAs again to drop PROT_WRITE
* if it was not there.
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
if (!(vma_entry_is(vma_entry, VMA_AREA_REGULAR)))
continue;
if (vma_entry_is(vma_entry, VMA_ANON_SHARED)) {
struct shmem_info *entry;
entry = find_shmem(args->shmems,
vma_entry->shmid);
if (entry && entry->pid == my_pid &&
entry->start == vma_entry->start)
futex_set_and_wake(&entry->lock, 1);
}
if (vma_entry->prot & PROT_WRITE)
continue;
sys_mprotect(decode_pointer(vma_entry->start),
vma_entry_len(vma_entry),
vma_entry->prot);
}
/*
* Finally restore madivse() bits
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
unsigned long i;
if (!vma_entry->has_madv || !vma_entry->madv)
continue;
for (i = 0; i < sizeof(vma_entry->madv) * 8; i++) {
if (vma_entry->madv & (1ul << i)) {
ret = sys_madvise(vma_entry->start,
vma_entry_len(vma_entry),
i);
if (ret) {
pr_err("madvise(%"PRIx64", %"PRIu64", %ld) "
"failed with %ld\n",
vma_entry->start,
vma_entry_len(vma_entry),
i, ret);
goto core_restore_end;
}
}
}
}
sys_munmap(args->tgt_vmas,
((void *)(vma_entry + 1) - ((void *)args->tgt_vmas)));
ret = sys_munmap(args->shmems, SHMEMS_SIZE);
if (ret < 0) {
pr_err("Can't unmap shmem %ld\n", ret);
goto core_restore_end;
}
/*
* Tune up the task fields.
*/
ret |= sys_prctl_safe(PR_SET_NAME, (long)args->comm, 0, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_CODE, (long)args->mm.mm_start_code, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_END_CODE, (long)args->mm.mm_end_code, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_DATA, (long)args->mm.mm_start_data, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_END_DATA, (long)args->mm.mm_end_data, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_STACK, (long)args->mm.mm_start_stack, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_BRK, (long)args->mm.mm_start_brk, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_BRK, (long)args->mm.mm_brk, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ARG_START, (long)args->mm.mm_arg_start, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ARG_END, (long)args->mm.mm_arg_end, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ENV_START, (long)args->mm.mm_env_start, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ENV_END, (long)args->mm.mm_env_end, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_AUXV, (long)args->mm_saved_auxv, args->mm_saved_auxv_size);
if (ret)
goto core_restore_end;
/*
* Because of requirements applied from kernel side
* we need to restore /proc/pid/exe symlink late,
* after old existing VMAs are superseded with
* new ones from image file.
*/
ret = restore_self_exe_late(args);
if (ret)
goto core_restore_end;
/*
* We need to prepare a valid sigframe here, so
* after sigreturn the kernel will pick up the
* registers from the frame, set them up and
* finally pass execution to the new IP.
*/
rt_sigframe = (void *)args->t->mem_zone.rt_sigframe + 8;
if (restore_thread_common(rt_sigframe, args->t))
goto core_restore_end;
/*
* Threads restoration. This requires some more comments. This
* restorer routine and thread restorer routine has the following
* memory map, prepared by a caller code.
*
* | <-- low addresses high addresses --> |
* +-------------------------------------------------------+-----------------------+
* | this proc body | own stack | heap | rt_sigframe space | thread restore zone |
* +-------------------------------------------------------+-----------------------+
*
* where each thread restore zone is the following
*
* | <-- low addresses high addresses --> |
* +--------------------------------------------------------------------------+
* | thread restore proc | thread1 stack | thread1 heap | thread1 rt_sigframe |
* +--------------------------------------------------------------------------+
*/
if (args->nr_threads > 1) {
struct thread_restore_args *thread_args = args->thread_args;
long clone_flags = CLONE_VM | CLONE_FILES | CLONE_SIGHAND |
CLONE_THREAD | CLONE_SYSVSEM;
long last_pid_len;
long parent_tid;
int i, fd;
fd = sys_open(LAST_PID_PATH, O_RDWR, LAST_PID_PERM);
if (fd < 0) {
pr_err("Can't open last_pid %d\n", fd);
goto core_restore_end;
}
ret = sys_flock(fd, LOCK_EX);
if (ret) {
pr_err("Can't lock last_pid %d\n", fd);
goto core_restore_end;
}
for (i = 0; i < args->nr_threads; i++) {
char last_pid_buf[16], *s;
/* skip self */
if (thread_args[i].pid == args->t->pid)
continue;
mutex_lock(&args->rst_lock);
new_sp =
RESTORE_ALIGN_STACK((long)thread_args[i].mem_zone.stack,
sizeof(thread_args[i].mem_zone.stack));
last_pid_len = vprint_num(last_pid_buf, sizeof(last_pid_buf), thread_args[i].pid - 1, &s);
ret = sys_write(fd, s, last_pid_len);
if (ret < 0) {
pr_err("Can't set last_pid %ld/%s\n", ret, last_pid_buf);
goto core_restore_end;
}
/*
* To achieve functionality like libc's clone()
* we need a pure assembly here, because clone()'ed
* thread will run with own stack and we must not
* have any additional instructions... oh, dear...
*/
RUN_CLONE_RESTORE_FN(ret, clone_flags, new_sp, parent_tid, thread_args, args->clone_restore_fn);
}
ret = sys_flock(fd, LOCK_UN);
if (ret) {
pr_err("Can't unlock last_pid %ld\n", ret);
goto core_restore_end;
}
sys_close(fd);
}
restore_rlims(args);
pr_info("%ld: Restored\n", sys_getpid());
futex_set(&zombies_inprogress, args->nr_zombies);
restore_finish_stage(CR_STATE_RESTORE);
futex_wait_while_gt(&zombies_inprogress, 0);
sys_sigaction(SIGCHLD, &args->sigchld_act, NULL, sizeof(k_rtsigset_t));
ret = restore_signals(args->siginfo, args->siginfo_nr, true);
if (ret)
goto core_restore_end;
ret = restore_signals(args->t->siginfo, args->t->siginfo_nr, false);
if (ret)
goto core_restore_end;
restore_finish_stage(CR_STATE_RESTORE_SIGCHLD);
if (args->siginfo_size) {
ret = sys_munmap(args->siginfo, args->siginfo_size);
if (ret < 0) {
pr_err("Can't unmap signals %ld\n", ret);
goto core_restore_failed;
}
}
rst_tcp_socks_all(args->rst_tcp_socks, args->rst_tcp_socks_size);
/*
* Writing to last-pid is CAP_SYS_ADMIN protected,
* turning off TCP repair is CAP_SYS_NED_ADMIN protected,
* thus restore* creds _after_ all of the above.
*/
ret = restore_creds(&args->creds);
futex_set_and_wake(&thread_inprogress, args->nr_threads);
restore_finish_stage(CR_STATE_RESTORE_CREDS);
if (ret)
BUG();
/* Wait until children stop to use args->task_entries */
futex_wait_while_gt(&thread_inprogress, 1);
log_set_fd(-1);
/*
* The code that prepared the itimers makes shure the
* code below doesn't fail due to bad timing values.
*/
#define itimer_armed(args, i) \
(args->itimers[i].it_interval.tv_sec || \
args->itimers[i].it_interval.tv_usec)
if (itimer_armed(args, 0))
sys_setitimer(ITIMER_REAL, &args->itimers[0], NULL);
if (itimer_armed(args, 1))
sys_setitimer(ITIMER_VIRTUAL, &args->itimers[1], NULL);
if (itimer_armed(args, 2))
sys_setitimer(ITIMER_PROF, &args->itimers[2], NULL);
ret = sys_munmap(args->task_entries, TASK_ENTRIES_SIZE);
if (ret < 0) {
ret = ((long)__LINE__ << 16) | ((-ret) & 0xffff);
goto core_restore_failed;
}
/*
* Sigframe stack.
*/
new_sp = (long)rt_sigframe + SIGFRAME_OFFSET;
/*
* Prepare the stack and call for sigreturn,
* pure assembly since we don't need any additional
* code insns from gcc.
*/
ARCH_RT_SIGRETURN(new_sp);
core_restore_end:
futex_abort_and_wake(&task_entries->nr_in_progress);
pr_err("Restorer fail %ld\n", sys_getpid());
sys_exit_group(1);
return -1;
core_restore_failed:
ARCH_FAIL_CORE_RESTORE;
return ret;
}
/*
* The main routine to restore task via sigreturn.
* This one is very special, we never return there
* but use sigreturn facility to restore core registers
* and jump execution to some predefined ip read from
* core file.
*/
long __export_restore_task(struct task_restore_args *args)
{
long ret = -1;
int i;
VmaEntry *vma_entry;
unsigned long va;
struct rt_sigframe *rt_sigframe;
unsigned long new_sp;
k_rtsigset_t to_block;
pid_t my_pid = sys_getpid();
rt_sigaction_t act;
bootstrap_start = args->bootstrap_start;
bootstrap_len = args->bootstrap_len;
#ifdef CONFIG_VDSO
vdso_rt_size = args->vdso_rt_size;
#endif
task_entries = args->task_entries;
helpers = args->helpers;
n_helpers = args->n_helpers;
*args->breakpoint = rst_sigreturn;
ksigfillset(&act.rt_sa_mask);
act.rt_sa_handler = sigchld_handler;
act.rt_sa_flags = SA_SIGINFO | SA_RESTORER | SA_RESTART;
act.rt_sa_restorer = cr_restore_rt;
sys_sigaction(SIGCHLD, &act, NULL, sizeof(k_rtsigset_t));
log_set_fd(args->logfd);
log_set_loglevel(args->loglevel);
cap_last_cap = args->cap_last_cap;
pr_info("Switched to the restorer %d\n", my_pid);
#ifdef CONFIG_VDSO
if (vdso_do_park(&args->vdso_sym_rt, args->vdso_rt_parked_at, vdso_rt_size))
goto core_restore_end;
#endif
if (unmap_old_vmas((void *)args->premmapped_addr, args->premmapped_len,
bootstrap_start, bootstrap_len))
goto core_restore_end;
/* Shift private vma-s to the left */
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (!vma_priv(vma_entry))
continue;
if (vma_entry->end >= TASK_SIZE)
continue;
if (vma_entry->start > vma_entry->shmid)
break;
if (vma_remap(vma_premmaped_start(vma_entry),
vma_entry->start, vma_entry_len(vma_entry)))
goto core_restore_end;
}
/* Shift private vma-s to the right */
for (i = args->nr_vmas - 1; i >= 0; i--) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (!vma_priv(vma_entry))
continue;
if (vma_entry->start > TASK_SIZE)
continue;
if (vma_entry->start < vma_entry->shmid)
break;
if (vma_remap(vma_premmaped_start(vma_entry),
vma_entry->start, vma_entry_len(vma_entry)))
goto core_restore_end;
}
/*
* OK, lets try to map new one.
*/
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
if (vma_priv(vma_entry))
continue;
va = restore_mapping(vma_entry);
if (va != vma_entry->start) {
pr_err("Can't restore %"PRIx64" mapping with %lx\n", vma_entry->start, va);
goto core_restore_end;
}
}
#ifdef CONFIG_VDSO
/*
* Proxify vDSO.
*/
for (i = 0; i < args->nr_vmas; i++) {
if (vma_entry_is(&args->tgt_vmas[i], VMA_AREA_VDSO) ||
vma_entry_is(&args->tgt_vmas[i], VMA_AREA_VVAR)) {
if (vdso_proxify("dumpee", &args->vdso_sym_rt,
args->vdso_rt_parked_at,
i, args->tgt_vmas, args->nr_vmas))
goto core_restore_end;
break;
}
}
#endif
/*
* Walk though all VMAs again to drop PROT_WRITE
* if it was not there.
*/
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!(vma_entry_is(vma_entry, VMA_AREA_REGULAR)))
continue;
if (vma_entry_is(vma_entry, VMA_ANON_SHARED)) {
struct shmem_info *entry;
entry = find_shmem(args->shmems, args->nr_shmems,
vma_entry->shmid);
if (entry && entry->pid == my_pid &&
entry->start == vma_entry->start)
futex_set_and_wake(&entry->lock, 1);
}
if (vma_entry->prot & PROT_WRITE)
continue;
sys_mprotect(decode_pointer(vma_entry->start),
vma_entry_len(vma_entry),
vma_entry->prot);
}
/*
* Finally restore madivse() bits
*/
for (i = 0; i < args->nr_vmas; i++) {
unsigned long m;
vma_entry = args->tgt_vmas + i;
if (!vma_entry->has_madv || !vma_entry->madv)
continue;
for (m = 0; m < sizeof(vma_entry->madv) * 8; m++) {
if (vma_entry->madv & (1ul << m)) {
ret = sys_madvise(vma_entry->start,
vma_entry_len(vma_entry),
m);
if (ret) {
pr_err("madvise(%"PRIx64", %"PRIu64", %ld) "
"failed with %ld\n",
vma_entry->start,
vma_entry_len(vma_entry),
m, ret);
goto core_restore_end;
}
}
}
}
ret = 0;
/*
* Tune up the task fields.
*/
ret |= sys_prctl_safe(PR_SET_NAME, (long)args->comm, 0, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_CODE, (long)args->mm.mm_start_code, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_END_CODE, (long)args->mm.mm_end_code, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_DATA, (long)args->mm.mm_start_data, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_END_DATA, (long)args->mm.mm_end_data, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_STACK, (long)args->mm.mm_start_stack, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_START_BRK, (long)args->mm.mm_start_brk, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_BRK, (long)args->mm.mm_brk, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ARG_START, (long)args->mm.mm_arg_start, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ARG_END, (long)args->mm.mm_arg_end, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ENV_START, (long)args->mm.mm_env_start, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_ENV_END, (long)args->mm.mm_env_end, 0);
ret |= sys_prctl_safe(PR_SET_MM, PR_SET_MM_AUXV, (long)args->mm_saved_auxv, args->mm_saved_auxv_size);
if (ret)
goto core_restore_end;
/*
* Because of requirements applied from kernel side
* we need to restore /proc/pid/exe symlink late,
* after old existing VMAs are superseded with
* new ones from image file.
*/
ret = restore_self_exe_late(args);
if (ret)
goto core_restore_end;
/*
* We need to prepare a valid sigframe here, so
* after sigreturn the kernel will pick up the
* registers from the frame, set them up and
* finally pass execution to the new IP.
*/
rt_sigframe = (void *)args->t->mem_zone.rt_sigframe;
if (restore_thread_common(rt_sigframe, args->t))
goto core_restore_end;
/*
* Threads restoration. This requires some more comments. This
* restorer routine and thread restorer routine has the following
* memory map, prepared by a caller code.
*
* | <-- low addresses high addresses --> |
* +-------------------------------------------------------+-----------------------+
* | this proc body | own stack | rt_sigframe space | thread restore zone |
* +-------------------------------------------------------+-----------------------+
*
* where each thread restore zone is the following
*
* | <-- low addresses high addresses --> |
* +--------------------------------------------------------------------------+
* | thread restore proc | thread1 stack | thread1 rt_sigframe |
* +--------------------------------------------------------------------------+
*/
if (args->nr_threads > 1) {
struct thread_restore_args *thread_args = args->thread_args;
long clone_flags = CLONE_VM | CLONE_FILES | CLONE_SIGHAND |
CLONE_THREAD | CLONE_SYSVSEM;
long last_pid_len;
long parent_tid;
int i, fd;
fd = args->fd_last_pid;
ret = sys_flock(fd, LOCK_EX);
if (ret) {
pr_err("Can't lock last_pid %d\n", fd);
goto core_restore_end;
}
for (i = 0; i < args->nr_threads; i++) {
char last_pid_buf[16], *s;
/* skip self */
if (thread_args[i].pid == args->t->pid)
continue;
new_sp = restorer_stack(thread_args + i);
last_pid_len = vprint_num(last_pid_buf, sizeof(last_pid_buf), thread_args[i].pid - 1, &s);
sys_lseek(fd, 0, SEEK_SET);
ret = sys_write(fd, s, last_pid_len);
if (ret < 0) {
pr_err("Can't set last_pid %ld/%s\n", ret, last_pid_buf);
goto core_restore_end;
}
/*
* To achieve functionality like libc's clone()
* we need a pure assembly here, because clone()'ed
* thread will run with own stack and we must not
* have any additional instructions... oh, dear...
*/
RUN_CLONE_RESTORE_FN(ret, clone_flags, new_sp, parent_tid, thread_args, args->clone_restore_fn);
}
ret = sys_flock(fd, LOCK_UN);
if (ret) {
pr_err("Can't unlock last_pid %ld\n", ret);
goto core_restore_end;
}
}
sys_close(args->fd_last_pid);
restore_rlims(args);
ret = create_posix_timers(args);
if (ret < 0) {
pr_err("Can't restore posix timers %ld\n", ret);
goto core_restore_end;
}
ret = timerfd_arm(args);
if (ret < 0) {
pr_err("Can't restore timerfd %ld\n", ret);
goto core_restore_end;
}
pr_info("%ld: Restored\n", sys_getpid());
futex_set(&zombies_inprogress, args->nr_zombies);
restore_finish_stage(CR_STATE_RESTORE);
futex_wait_while_gt(&zombies_inprogress, 0);
if (wait_helpers(args) < 0)
goto core_restore_end;
ksigfillset(&to_block);
ret = sys_sigprocmask(SIG_SETMASK, &to_block, NULL, sizeof(k_rtsigset_t));
if (ret) {
pr_err("Unable to block signals %ld", ret);
goto core_restore_end;
}
sys_sigaction(SIGCHLD, &args->sigchld_act, NULL, sizeof(k_rtsigset_t));
ret = restore_signals(args->siginfo, args->siginfo_nr, true);
if (ret)
goto core_restore_end;
ret = restore_signals(args->t->siginfo, args->t->siginfo_nr, false);
if (ret)
goto core_restore_end;
restore_finish_stage(CR_STATE_RESTORE_SIGCHLD);
rst_tcp_socks_all(args);
/*
* Writing to last-pid is CAP_SYS_ADMIN protected,
* turning off TCP repair is CAP_SYS_NED_ADMIN protected,
* thus restore* creds _after_ all of the above.
*/
ret = restore_creds(&args->creds);
ret = ret || restore_dumpable_flag(&args->mm);
ret = ret || restore_pdeath_sig(args->t);
futex_set_and_wake(&thread_inprogress, args->nr_threads);
restore_finish_stage(CR_STATE_RESTORE_CREDS);
if (ret)
BUG();
/* Wait until children stop to use args->task_entries */
futex_wait_while_gt(&thread_inprogress, 1);
log_set_fd(-1);
/*
* The code that prepared the itimers makes shure the
* code below doesn't fail due to bad timing values.
*/
#define itimer_armed(args, i) \
(args->itimers[i].it_interval.tv_sec || \
args->itimers[i].it_interval.tv_usec)
if (itimer_armed(args, 0))
sys_setitimer(ITIMER_REAL, &args->itimers[0], NULL);
if (itimer_armed(args, 1))
sys_setitimer(ITIMER_VIRTUAL, &args->itimers[1], NULL);
if (itimer_armed(args, 2))
sys_setitimer(ITIMER_PROF, &args->itimers[2], NULL);
restore_posix_timers(args);
sys_munmap(args->rst_mem, args->rst_mem_size);
/*
* Sigframe stack.
*/
new_sp = (long)rt_sigframe + SIGFRAME_OFFSET;
/*
* Prepare the stack and call for sigreturn,
* pure assembly since we don't need any additional
* code insns from gcc.
*/
rst_sigreturn(new_sp);
core_restore_end:
futex_abort_and_wake(&task_entries->nr_in_progress);
pr_err("Restorer fail %ld\n", sys_getpid());
sys_exit_group(1);
return -1;
}
int shutdown_signals()
{
cleanup_gdb_crash_handler();
restore_signals();
return 0;
} //shutdown_signals