From 122c7b6cbbb564a2e06b88a67290aa4fdb6b9749 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 1 Mar 2021 14:35:06 +0100
Subject: [PATCH] Kernel: Use Userspace<T> in sys$write()

---
 Kernel/Process.h          | 2 +-
 Kernel/Syscalls/write.cpp | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Kernel/Process.h b/Kernel/Process.h
index d663448dd3..9727fba06e 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -242,7 +242,7 @@ public:
     KResultOr<int> sys$close(int fd);
     KResultOr<ssize_t> sys$read(int fd, Userspace<u8*>, ssize_t);
     KResultOr<ssize_t> sys$readv(int fd, Userspace<const struct iovec*> iov, int iov_count);
-    KResultOr<ssize_t> sys$write(int fd, const u8*, ssize_t);
+    KResultOr<ssize_t> sys$write(int fd, Userspace<const u8*>, ssize_t);
     KResultOr<ssize_t> sys$writev(int fd, Userspace<const struct iovec*> iov, int iov_count);
     KResultOr<int> sys$fstat(int fd, Userspace<stat*>);
     KResultOr<int> sys$stat(Userspace<const Syscall::SC_stat_params*>);
diff --git a/Kernel/Syscalls/write.cpp b/Kernel/Syscalls/write.cpp
index 82d952e1e0..b5e070522b 100644
--- a/Kernel/Syscalls/write.cpp
+++ b/Kernel/Syscalls/write.cpp
@@ -114,7 +114,7 @@ KResultOr<ssize_t> Process::do_write(FileDescription& description, const UserOrK
     return total_nwritten;
 }
 
-KResultOr<ssize_t> Process::sys$write(int fd, const u8* data, ssize_t size)
+KResultOr<ssize_t> Process::sys$write(int fd, Userspace<const u8*> data, ssize_t size)
 {
     REQUIRE_PROMISE(stdio);
     if (size < 0)
@@ -129,7 +129,7 @@ KResultOr<ssize_t> Process::sys$write(int fd, const u8* data, ssize_t size)
     if (!description->is_writable())
         return EBADF;
 
-    auto buffer = UserOrKernelBuffer::for_user_buffer(const_cast<u8*>(data), (size_t)size);
+    auto buffer = UserOrKernelBuffer::for_user_buffer(data, static_cast<size_t>(size));
     if (!buffer.has_value())
         return EFAULT;
     return do_write(*description, buffer.value(), size);