Explicitly stub some syscalls used by new versions of alpine

kernel/calls.c

@@ -160,6 +160,8 @@ syscall_t syscall_table[] = {
     [212] = (syscall_t) sys_chown32,
     [213] = (syscall_t) sys_setuid,
     [214] = (syscall_t) sys_setgid,
+    [215] = (syscall_t) syscall_stub, // setfsuid
+    [216] = (syscall_t) syscall_stub, // setfsgid
     [219] = (syscall_t) sys_madvise,
     [220] = (syscall_t) sys_getdents64,
     [221] = (syscall_t) sys_fcntl,
@@ -246,6 +248,7 @@ syscall_t syscall_table[] = {
     [377] = (syscall_t) sys_copy_file_range,
     [383] = (syscall_t) syscall_silent_stub, // statx
     [384] = (syscall_t) sys_arch_prctl,
+    [422] = (syscall_t) syscall_silent_stub, // futex_time64
     [439] = (syscall_t) syscall_silent_stub, // faccessat2
 };
 
@@ -259,7 +262,7 @@ void handle_interrupt(int interrupt) {
         unsigned syscall_num = cpu->eax;
         if (syscall_num >= NUM_SYSCALLS || syscall_table[syscall_num] == NULL) {
             printk("%d(%s) missing syscall %d\n", current->pid, current->comm, syscall_num);
-            cpu->eax = syscall_stub();
+            cpu->eax = _ENOSYS;
         } else {
             if (syscall_table[syscall_num] == (syscall_t) syscall_stub) {
                 printk("%d(%s) stub syscall %d\n", current->pid, current->comm, syscall_num);