1 /*
2 * Copyright (c) 2020-2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15 #include "device.h"
16
17 #include <errno.h>
18 #include <fcntl.h>
19 #include <sys/mount.h>
20 #include <sys/stat.h>
21 #include <sys/sysmacros.h>
22
23 #include <linux/major.h>
24 #include "init_log.h"
25
26 #define DEFAULT_RW_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
27 #define DEFAULT_NO_AUTHORITY_MODE (S_IWUSR | S_IRUSR)
28 #define STDERR_HANDLE 2
29
CloseStdio(void)30 void CloseStdio(void)
31 {
32 int fd = open("/dev/null", O_RDWR | O_CLOEXEC);
33 if (fd < 0) {
34 return;
35 }
36 dup2(fd, 0);
37 dup2(fd, 1);
38 dup2(fd, STDERR_HANDLE);
39 close(fd);
40 }
41
MountBasicFs(void)42 void MountBasicFs(void)
43 {
44 if (mount("tmpfs", "/dev", "tmpfs", MS_NOSUID, "mode=0755") != 0) {
45 INIT_LOGE("Mount tmpfs failed. %s", strerror(errno));
46 }
47 if (mount("tmpfs", "/mnt", "tmpfs", MS_NOSUID, "mode=0755") != 0) {
48 INIT_LOGE("Mount tmpfs failed. %s", strerror(errno));
49 }
50 if (mkdir("/dev/pts", S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) != 0) {
51 INIT_LOGE("mkdir /dev/pts failed. %s", strerror(errno));
52 }
53 if (mount("devpts", "/dev/pts", "devpts", 0, NULL) != 0) {
54 INIT_LOGE("Mount devpts failed. %s", strerror(errno));
55 }
56 if (mount("proc", "/proc", "proc", 0, "hidepid=2") != 0) {
57 INIT_LOGE("Mount procfs failed. %s", strerror(errno));
58 }
59 if (mount("sysfs", "/sys", "sysfs", 0, NULL) != 0) {
60 INIT_LOGE("Mount sysfs failed. %s", strerror(errno));
61 }
62 if (mount("selinuxfs", "/sys/fs/selinux", "selinuxfs", 0, NULL) != 0) {
63 INIT_LOGE("Mount selinuxfs failed. %s", strerror(errno));
64 }
65 }
66
CreateDeviceNode(void)67 void CreateDeviceNode(void)
68 {
69 if (mknod("/dev/null", S_IFCHR | DEFAULT_RW_MODE, makedev(MEM_MAJOR, DEV_NULL_MINOR)) != 0) {
70 INIT_LOGE("Create /dev/null device node failed. %s", strerror(errno));
71 }
72 if (mknod("/dev/random", S_IFCHR | DEFAULT_RW_MODE, makedev(MEM_MAJOR, DEV_RANDOM_MINOR)) != 0) {
73 INIT_LOGE("Create /dev/random device node failed. %s", strerror(errno));
74 }
75
76 if (mknod("/dev/urandom", S_IFCHR | DEFAULT_RW_MODE, makedev(MEM_MAJOR, DEV_URANDOM_MINOR)) != 0) {
77 INIT_LOGE("Create /dev/urandom device node failed. %s", strerror(errno));
78 }
79 }
80
81