1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "log.h"
18
19 #include <fcntl.h>
20 #include <linux/audit.h>
21 #include <string.h>
22 #include <unistd.h>
23
24 #include <android-base/logging.h>
25 #include <cutils/android_reboot.h>
26 #include <selinux/selinux.h>
27
28 #include "reboot.h"
29
30 namespace android {
31 namespace init {
32
InitAborter(const char * abort_message)33 static void InitAborter(const char* abort_message) {
34 // When init forks, it continues to use this aborter for LOG(FATAL), but we want children to
35 // simply abort instead of trying to reboot the system.
36 if (getpid() != 1) {
37 android::base::DefaultAborter(abort_message);
38 return;
39 }
40
41 // DoReboot() does a lot to try to shutdown the system cleanly. If something happens to call
42 // LOG(FATAL) in the shutdown path, we want to catch this and immediately use the syscall to
43 // reboot instead of recursing here.
44 static bool has_aborted = false;
45 if (!has_aborted) {
46 has_aborted = true;
47 // Do not queue "shutdown" trigger since we want to shutdown immediately and it's not likely
48 // that we can even run the ActionQueue at this point.
49 DoReboot(ANDROID_RB_RESTART2, "reboot", "bootloader", false);
50 } else {
51 RebootSystem(ANDROID_RB_RESTART2, "bootloader");
52 }
53 }
54
InitKernelLogging(char * argv[])55 void InitKernelLogging(char* argv[]) {
56 // Make stdin/stdout/stderr all point to /dev/null.
57 int fd = open("/sys/fs/selinux/null", O_RDWR);
58 if (fd == -1) {
59 int saved_errno = errno;
60 android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
61 errno = saved_errno;
62 PLOG(FATAL) << "Couldn't open /sys/fs/selinux/null";
63 }
64 dup2(fd, 0);
65 dup2(fd, 1);
66 dup2(fd, 2);
67 if (fd > 2) close(fd);
68
69 android::base::InitLogging(argv, &android::base::KernelLogger, InitAborter);
70 }
71
selinux_klog_callback(int type,const char * fmt,...)72 int selinux_klog_callback(int type, const char *fmt, ...) {
73 android::base::LogSeverity severity = android::base::ERROR;
74 if (type == SELINUX_WARNING) {
75 severity = android::base::WARNING;
76 } else if (type == SELINUX_INFO) {
77 severity = android::base::INFO;
78 }
79 char buf[1024];
80 va_list ap;
81 va_start(ap, fmt);
82 vsnprintf(buf, sizeof(buf), fmt, ap);
83 va_end(ap);
84 android::base::KernelLogger(android::base::MAIN, severity, "selinux", nullptr, 0, buf);
85 return 0;
86 }
87
88 } // namespace init
89 } // namespace android
90