From 6bbfa26813e1206d62ab5dd6160e392c15f4c5c4 Mon Sep 17 00:00:00 2001
From: Woody Lin <woodylin@google.com>
Date: Fri, 27 Dec 2019 18:14:13 +0800
Subject: [PATCH] InitFatalReboot: Panic the system if init_fatal_panic is
 "true"

While handling the fatal signals and abort, exits from the signal
handler to panic the system if "androidboot.init_fatal_panic" in cmdline
is configured as "true".

Bug: 146818493
Change-Id: I59fffb7598ce981383ae24961a97fd2fd8e8d64e
---
 init/reboot_utils.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/init/reboot_utils.cpp b/init/reboot_utils.cpp
index dac0cf4ae..485188ba0 100644
--- a/init/reboot_utils.cpp
+++ b/init/reboot_utils.cpp
@@ -34,12 +34,16 @@ namespace android {
 namespace init {
 
 static std::string init_fatal_reboot_target = "bootloader";
+static bool init_fatal_panic = false;
 
 void SetFatalRebootTarget() {
     std::string cmdline;
     android::base::ReadFileToString("/proc/cmdline", &cmdline);
     cmdline = android::base::Trim(cmdline);
 
+    const char kInitFatalPanicString[] = "androidboot.init_fatal_panic=true";
+    init_fatal_panic = cmdline.find(kInitFatalPanicString) != std::string::npos;
+
     const char kRebootTargetString[] = "androidboot.init_fatal_reboot_target=";
     auto start_pos = cmdline.find(kRebootTargetString);
     if (start_pos == std::string::npos) {
@@ -133,6 +137,9 @@ void __attribute__((noreturn)) InitFatalReboot(int signal_number) {
     for (size_t i = 0; i < backtrace->NumFrames(); i++) {
         LOG(ERROR) << backtrace->FormatFrameData(i);
     }
+    if (init_fatal_panic) {
+        _exit(signal_number);
+    }
     RebootSystem(ANDROID_RB_RESTART2, init_fatal_reboot_target);
 }