Kernel: Use Userspace<T> in sys$get_dir_entries()

Kernel/Process.h

@@ -261,7 +261,7 @@ public:
     KResultOr<int> sys$purge(int mode);
     KResultOr<int> sys$select(const Syscall::SC_select_params*);
     KResultOr<int> sys$poll(Userspace<const Syscall::SC_poll_params*>);
-    KResultOr<ssize_t> sys$get_dir_entries(int fd, void*, ssize_t);
+    KResultOr<ssize_t> sys$get_dir_entries(int fd, Userspace<void*>, ssize_t);
     KResultOr<int> sys$getcwd(Userspace<char*>, size_t);
     KResultOr<int> sys$chdir(Userspace<const char*>, size_t);
     KResultOr<int> sys$fchdir(int fd);

Kernel/Syscalls/get_dir_entries.cpp

@@ -29,18 +29,18 @@
 
 namespace Kernel {
 
-KResultOr<ssize_t> Process::sys$get_dir_entries(int fd, void* buffer, ssize_t size)
+KResultOr<ssize_t> Process::sys$get_dir_entries(int fd, Userspace<void*> user_buffer, ssize_t user_size)
 {
     REQUIRE_PROMISE(stdio);
-    if (size < 0)
+    if (user_size < 0)
         return EINVAL;
     auto description = file_description(fd);
     if (!description)
         return EBADF;
-    auto user_buffer = UserOrKernelBuffer::for_user_buffer((u8*)buffer, size);
-    if (!user_buffer.has_value())
+    auto buffer = UserOrKernelBuffer::for_user_buffer(user_buffer, static_cast<size_t>(user_size));
+    if (!buffer.has_value())
         return EFAULT;
-    return description->get_dir_entries(user_buffer.value(), size);
+    return description->get_dir_entries(buffer.value(), user_size);
 }
 
 }