reboot: fix owner and permissions of last_reboot_reason file
Default signature WriteStringToFile creates world-writeable files.
Set owner and group system and remove read/write for non-owner.
Bug: 37251463
Test: Manual: reboot, inspect
Change-Id: I6a29c678168dcae611b120dc52170f4eee7069a9
diff --git a/init/reboot.cpp b/init/reboot.cpp
index 8e46d57..e887677 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -43,6 +43,7 @@
#include <cutils/android_reboot.h>
#include <fs_mgr.h>
#include <logwrap/logwrap.h>
+#include <private/android_filesystem_config.h>
#include "log.h"
#include "property_service.h"
@@ -305,7 +306,8 @@
Timer t;
LOG(INFO) << "Reboot start, reason: " << reason << ", rebootTarget: " << rebootTarget;
- android::base::WriteStringToFile(StringPrintf("%s\n", reason.c_str()), LAST_REBOOT_REASON_FILE);
+ android::base::WriteStringToFile(StringPrintf("%s\n", reason.c_str()), LAST_REBOOT_REASON_FILE,
+ S_IRUSR | S_IWUSR, AID_SYSTEM, AID_SYSTEM);
if (cmd == ANDROID_RB_THERMOFF) { // do not wait if it is thermal
DoThermalOff();