static long dune_clone(struct dune_tf *tf)
{
unsigned long fs;
int rc;
unsigned long pc;
rdmsrl(MSR_GS_BASE, pc);
if (ARG1(tf) != 0)
return dune_pthread_create(tf);
fs = dune_get_user_fs();
rc = syscall(SYS_clone, ARG0(tf), ARG1(tf), ARG2(tf), ARG3(tf),
ARG4(tf));
if (rc < 0)
return -errno;
if (rc == 0) {
dune_enter();
dune_set_user_fs(fs);
}
return rc;
}
int boxer_main(int argc, char *argv[])
{
int ret;
uintptr_t sp;
struct elf_data data;
if (argc < 2)
return -EINVAL;
/* XXX needed. Probably does some libc stuff */
printf(" \b");
// printf("%s\n", environ[0]);
ret = dune_init(0);
if (ret) {
printf("sandbox: failed to initialize Dune\n");
return ret;
}
ret = dune_enter();
if (ret) {
printf("sandbox: failed to enter Dune mode\n");
return ret;
}
ret = load_elf(argv[1], &data);
if (ret)
return ret;
// printf("sandbox: entry addr is %lx\n", data.entry);
dune_set_user_fs(0); // default starting fs
ret = trap_init();
if (ret) {
printf("failed to initialize trap handlers\n");
return ret;
}
ret = umm_alloc_stack(&sp);
if (ret) {
printf("failed to alloc stack\n");
return ret;
}
sp = setup_arguments(sp, argv[1], &argv[2], environ, data);
if (!sp) {
printf("failed to setup arguments\n");
return -EINVAL;
}
ret = run_app(sp, data.entry);
return ret;
}
void *pthread_entry(void *arg)
{
struct thread_arg *a = arg;
struct dune_tf *tf = a->ta_tf;
struct dune_tf child_tf;
int *tidp = NULL;
pid_t tid;
int flags = ARG0(tf);
if (!a->dune_started)
dune_enter();
tid = syscall(SYS_gettid);
/* XXX validate */
/* set up tls */
if (flags & CLONE_SETTLS)
dune_set_user_fs(ARG4(tf));
if (flags & CLONE_PARENT_SETTID) {
tidp = (int *) ARG2(tf);
*tidp = tid;
}
if (flags & CLONE_CHILD_CLEARTID) {
tidp = (int *) ARG3(tf);
syscall(SYS_set_tid_address, tidp);
}
/* enter thread */
memcpy(&child_tf, tf, sizeof(child_tf));
child_tf.rip = tf->rip;
child_tf.rax = 0;
child_tf.rsp = ARG1(tf);
/* tell parent tid */
pthread_mutex_lock(&a->ta_mtx);
a->ta_tid = tid;
pthread_mutex_unlock(&a->ta_mtx);
pthread_cond_signal(&a->ta_cnd);
do_enter_thread(&child_tf);
return NULL;
}
static void syscall_do_foreal(struct dune_tf *tf)
{
switch (tf->rax) {
case SYS_arch_prctl:
switch (ARG0(tf)) {
case ARCH_GET_FS:
*((unsigned long*) ARG1(tf)) = dune_get_user_fs();
tf->rax = 0;
break;
case ARCH_SET_FS:
dune_set_user_fs(ARG1(tf));
tf->rax = 0;
break;
default:
tf->rax = -EINVAL;
break;
}
break;
case SYS_brk:
tf->rax = umm_brk((unsigned long) ARG0(tf));
break;
case SYS_mmap:
tf->rax = (unsigned long) umm_mmap((void *) ARG0(tf),
(size_t) ARG1(tf), (int) ARG2(tf), (int) ARG3(tf),
(int) ARG4(tf), (off_t) ARG5(tf));
break;
case SYS_mprotect:
tf->rax = umm_mprotect((void *) ARG0(tf),
(size_t) ARG1(tf),
ARG2(tf));
break;
case SYS_munmap:
tf->rax = umm_munmap((void *) ARG0(tf), (size_t) ARG1(tf));
break;
case SYS_mremap:
tf->rax = (unsigned long) umm_mremap((void*) ARG0(tf),
(size_t) ARG1(tf), (size_t) ARG2(tf),
(int) ARG3(tf), (void*) ARG4(tf));
break;
case SYS_shmat:
tf->rax = (unsigned long) umm_shmat((int) ARG0(tf),
(void*) ARG1(tf), (int) ARG2(tf));
break;
case SYS_clone:
tf->rax = dune_clone(tf);
break;
case SYS_execve:
tf->rax = exec_execev((const char *)ARG0(tf),
(char **const)ARG1(tf),
(char **const)ARG2(tf));
break;
/* ignore signals for now */
case SYS_rt_sigaction:
case SYS_rt_sigprocmask:
tf->rax = 0;
break;
case SYS_sigaltstack:
case SYS_signalfd:
case SYS_signalfd4:
case SYS_rt_sigpending:
case SYS_rt_sigreturn:
case SYS_rt_sigsuspend:
case SYS_rt_sigqueueinfo:
case SYS_rt_sigtimedwait:
tf->rax = -ENOSYS;
break;
case SYS_exit_group:
case SYS_exit:
dune_ret_from_user(ARG0(tf));
break;
default:
dune_passthrough_syscall(tf);
break;
}
}
