Home | History | Annotate | Download | only in init 
      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 
     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 
     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 
     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