Check dir path before updating permissions.
Bug: 240685104
Test: atest android.telephonyprovider.cts.MmsPartTest
atest CtsTelephonyTestCases
Sanity check - sending and receiving sms and mms manually
Change-Id: I2c60cc2cf8f1f6890678d3cd8c6cfdf31356349f
(cherry picked from commit ff2cc0cede04445bf5ecbdaf3f0aa8dd0d48ac94)
Merged-In: I2c60cc2cf8f1f6890678d3cd8c6cfdf31356349f
diff --git a/src/com/android/providers/telephony/MmsProvider.java b/src/com/android/providers/telephony/MmsProvider.java
index 96059d7..1e33313 100644
--- a/src/com/android/providers/telephony/MmsProvider.java
+++ b/src/com/android/providers/telephony/MmsProvider.java
@@ -46,6 +46,7 @@
import android.system.ErrnoException;
import android.system.Os;
import android.text.TextUtils;
+import android.util.EventLog;
import android.util.Log;
import com.google.android.mms.pdu.PduHeaders;
@@ -820,13 +821,21 @@
case MMS_PART_RESET_FILE_PERMISSION:
String path = getContext().getDir(PARTS_DIR_NAME, 0).getPath() + '/' +
uri.getPathSegments().get(1);
- // Reset the file permission back to read for everyone but me.
+
try {
+ String partsDirPath = getContext().getDir(PARTS_DIR_NAME, 0).getCanonicalPath();
+ if (!new File(path).getCanonicalPath().startsWith(partsDirPath)) {
+ EventLog.writeEvent(0x534e4554, "240685104",
+ Binder.getCallingUid(), (TAG + " update: path " + path +
+ " does not start with " + partsDirPath));
+ return 0;
+ }
+ // Reset the file permission back to read for everyone but me.
Os.chmod(path, 0644);
if (LOCAL_LOGV) {
Log.d(TAG, "MmsProvider.update chmod is successful for path: " + path);
}
- } catch (ErrnoException e) {
+ } catch (ErrnoException | IOException e) {
Log.e(TAG, "Exception in chmod: " + e);
}
return 0;