jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/RefPtr.h>
8#include <Kernel/FileSystem/Custody.h>
9#include <Kernel/FileSystem/OpenFileDescription.h>
10#include <Kernel/FileSystem/VirtualFileSystem.h>
11#include <Kernel/Process.h>
12
13namespace Kernel {
14
15ErrorOr<FlatPtr> Process::sys$fchown(int fd, UserID uid, GroupID gid)
16{
17 VERIFY_NO_PROCESS_BIG_LOCK(this);
18 TRY(require_promise(Pledge::chown));
19 auto description = TRY(open_file_description(fd));
20 TRY(description->chown(credentials(), uid, gid));
21 return 0;
22}
23
24ErrorOr<FlatPtr> Process::sys$chown(Userspace<Syscall::SC_chown_params const*> user_params)
25{
26 VERIFY_NO_PROCESS_BIG_LOCK(this);
27 TRY(require_promise(Pledge::chown));
28 auto params = TRY(copy_typed_from_user(user_params));
29 auto path = TRY(get_syscall_path_argument(params.path));
30
31 RefPtr<Custody> base;
32 if (params.dirfd == AT_FDCWD) {
33 base = current_directory();
34 } else {
35 auto base_description = TRY(open_file_description(params.dirfd));
36 if (!base_description->custody())
37 return EINVAL;
38 base = base_description->custody();
39 }
40
41 TRY(VirtualFileSystem::the().chown(credentials(), path->view(), params.uid, params.gid, *base, params.follow_symlinks ? 0 : O_NOFOLLOW_NOERROR));
42 return 0;
43}
44
45}