Change file permissions for shutdown files

Make the shutdown-checkpoints files readable for platform apps.

Test: Check that shutdown-checkpoint file is created with correct
      permission
    1 Generate a new shutdown-checkpoint file
      This can be done by a reboot from the device power menu
      PS "adb reboot" does not generate a shutdown-checkpoint file
    2 Check the permissions with adb
      $ adb shell ls -laZ /data/system/shutdown-checkpoints | grep shutdown_checkpoints
      drwxr-xr-x  2 system system u:object_r:shutdown_checkpoints_system_data_file:s0  3452 2023-10-19 10:21 .
      -rw-r--r--  1 system system u:object_r:shutdown_checkpoints_system_data_file:s0  1307 2023-10-19 10:21 checkpoints-1697703667771
    3 Check that  the shutdown-checkpoint dir permission is "drwxr-xr-x"
    4 Check that a new shutdown-checkpoint file has been created with
      the permission "-rw-r--r--"
Bug: 306198106
Change-Id: I1639d59f1eb41063c5ac4898738a9f8f5c882028

1 files changed, 9 insertions, 2 deletions

diff --git a/services/core/java/com/android/server/power/ShutdownCheckPoints.java b/services/core/java/com/android/server/power/ShutdownCheckPoints.java
index dafaa7d5f134..399e214aa955 100644
--- a/services/core/java/com/android/server/power/ShutdownCheckPoints.java
+++ b/services/core/java/com/android/server/power/ShutdownCheckPoints.java
@@ -350,17 +350,23 @@ public final class ShutdownCheckPoints {
 
         private final ShutdownCheckPoints mInstance;
         private final File mBaseFile;
+        private final File mBaseDir;
         private final int mFileCountLimit;
 
         FileDumperThread(ShutdownCheckPoints instance, File baseFile, int fileCountLimit) {
             mInstance = instance;
             mBaseFile = baseFile;
+            mBaseDir = baseFile.getParentFile();
             mFileCountLimit = fileCountLimit;
         }
 
         @Override
         public void run() {
-            mBaseFile.getParentFile().mkdirs();
+            if (!mBaseDir.exists()) {
+                mBaseDir.mkdirs();
+                mBaseDir.setExecutable(true, false);
+                mBaseDir.setReadable(true, false);
+            }
             File[] checkPointFiles = listCheckPointsFiles();
 
             int filesToDelete = checkPointFiles.length - mFileCountLimit + 1;
@@ -375,7 +381,7 @@ public final class ShutdownCheckPoints {
 
         private File[] listCheckPointsFiles() {
             String filePrefix = mBaseFile.getName() + "-";
-            File[] files = mBaseFile.getParentFile().listFiles(new FilenameFilter() {
+            File[] files = mBaseDir.listFiles(new FilenameFilter() {
                 @Override
                 public boolean accept(File dir, String name) {
                     if (!name.startsWith(filePrefix)) {
@@ -412,6 +418,7 @@ public final class ShutdownCheckPoints {
                 }
             }
             mBaseFile.renameTo(file);
+            file.setReadable(true, false);
         }
     }
 }