commit d52ac3c0e23380c77e4e0598bb352f1d7beb8435
author Aishwarya Mallampati <amallampati@google.com> Wed May 10 21:54:43 2023 +0000
committer android-t1 <android-t1@t2mobile.com> Wed Aug 02 17:45:09 2023 +0800
tree a1022f906286262fbd8242b8a993c09f50a54322
parent 6f4fc51bbe1006e5def1bc58576cc04bac95898d

Update file permissions using canonical path

Bug: 264880895
Bug: 264880689
Test: atest android.telephonyprovider.cts.MmsPartTest
      atest CtsTelephonyTestCases
      Sanity check - sending and receiving sms and mms manually
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:6743638a096c32627f398efd2ea78f08b8a2db8c)
Merged-In: I8dd888ea31ec07c9f0de38eb8e8170d3ed255686
Change-Id: I8dd888ea31ec07c9f0de38eb8e8170d3ed255686

src/com/android/providers/telephony/MmsProvider.java

diff --git a/src/com/android/providers/telephony/MmsProvider.java b/src/com/android/providers/telephony/MmsProvider.java
index b1462ae..cda84fd 100644
--- a/src/com/android/providers/telephony/MmsProvider.java
+++ b/src/com/android/providers/telephony/MmsProvider.java
@@ -1051,15 +1051,16 @@
                         uri.getPathSegments().get(1);
 
                 try {
+                    File canonicalFile = new File(path).getCanonicalFile();
                     String partsDirPath = getContext().getDir(PARTS_DIR_NAME, 0).getCanonicalPath();
-                    if (!new File(path).getCanonicalPath().startsWith(partsDirPath)) {
+                    if (!canonicalFile.getPath().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);
+                    Os.chmod(canonicalFile.getPath(), 0644);
                     if (LOCAL_LOGV) {
                         Log.d(TAG, "MmsProvider.update chmod is successful for path: " + path);
                     }