Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 1b936b73 authored by Pin-Chuan Liu's avatar Pin-Chuan Liu Committed by Denis Hsu
Browse files

Retry to get and mount CE data directory again 

CE might unlocks and the name is decrypted,
gets the name and mounts it again.

Bug: 162298284
Change-Id: Ic5fec356bb55d54b7f8ad2933229511b50797a08
parent ef2c66e7

core/jni/com_android_internal_os_Zygote.cpp

+40 −6
Original line number Diff line number Diff line
@@ -804,10 +804,14 @@ static void PrepareDirIfNotPresent(const std::string& dir, mode_t mode, uid_t ui 
  PrepareDir(dir, mode, uid, gid, fail_fn);

}



static bool BindMount(const std::string& source_dir, const std::string& target_dir) {

  return !(TEMP_FAILURE_RETRY(mount(source_dir.c_str(), target_dir.c_str(), nullptr,

                                    MS_BIND | MS_REC, nullptr)) == -1);

}



static void BindMount(const std::string& source_dir, const std::string& target_dir,

                      fail_fn_t fail_fn) {

  if (TEMP_FAILURE_RETRY(mount(source_dir.c_str(), target_dir.c_str(), nullptr,

                               MS_BIND | MS_REC, nullptr)) == -1) {

  if (!BindMount(source_dir, target_dir)) {

    fail_fn(CREATE_ERROR("Failed to mount %s to %s: %s",

                         source_dir.c_str(), target_dir.c_str(), strerror(errno)));

  }
@@ -1194,9 +1198,9 @@ static pid_t ForkCommon(JNIEnv* env, bool is_system_server, 


// Create an app data directory over tmpfs overlayed CE / DE storage, and bind mount it

// from the actual app data directory in data mirror.

static void createAndMountAppData(std::string_view package_name,

static bool createAndMountAppData(std::string_view package_name,

    std::string_view mirror_pkg_dir_name, std::string_view mirror_data_path,

    std::string_view actual_data_path, fail_fn_t fail_fn) {

    std::string_view actual_data_path, fail_fn_t fail_fn, bool call_fail_fn) {



  char mirrorAppDataPath[PATH_MAX];

  char actualAppDataPath[PATH_MAX];
@@ -1206,6 +1210,29 @@ static void createAndMountAppData(std::string_view package_name, 


  PrepareDir(actualAppDataPath, 0700, AID_ROOT, AID_ROOT, fail_fn);



  // Bind mount from original app data directory in mirror.

  if (call_fail_fn) {

    BindMount(mirrorAppDataPath, actualAppDataPath, fail_fn);

  } else if(!BindMount(mirrorAppDataPath, actualAppDataPath)) {

    ALOGW("Failed to mount %s to %s: %s",

          mirrorAppDataPath, actualAppDataPath, strerror(errno));

    return false;

  }

  return true;

}



// There is an app data directory over tmpfs overlaid CE / DE storage

// bind mount it from the actual app data directory in data mirror.

static void mountAppData(std::string_view package_name,

    std::string_view mirror_pkg_dir_name, std::string_view mirror_data_path,

    std::string_view actual_data_path, fail_fn_t fail_fn) {



  char mirrorAppDataPath[PATH_MAX];

  char actualAppDataPath[PATH_MAX];

  snprintf(mirrorAppDataPath, PATH_MAX, "%s/%s", mirror_data_path.data(),

      mirror_pkg_dir_name.data());

  snprintf(actualAppDataPath, PATH_MAX, "%s/%s", actual_data_path.data(), package_name.data());



  // Bind mount from original app data directory in mirror.

  BindMount(mirrorAppDataPath, actualAppDataPath, fail_fn);

}
@@ -1284,10 +1311,17 @@ static void isolateAppDataPerPackage(int userId, std::string_view package_name, 
  snprintf(mirrorCePath, PATH_MAX, "%s/%d", mirrorCeParent, userId);

  snprintf(mirrorDePath, PATH_MAX, "/data_mirror/data_de/%s/%d", volume_uuid.data(), userId);



  createAndMountAppData(package_name, package_name, mirrorDePath, actualDePath, fail_fn);

  createAndMountAppData(package_name, package_name, mirrorDePath, actualDePath, fail_fn,

                        true /*call_fail_fn*/);



  std::string ce_data_path = getAppDataDirName(mirrorCePath, package_name, ce_data_inode, fail_fn);

  createAndMountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn);

  if (!createAndMountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn,

                             false /*call_fail_fn*/)) {

    // CE might unlocks and the name is decrypted

    // get the name and mount again

    ce_data_path=getAppDataDirName(mirrorCePath, package_name, ce_data_inode, fail_fn);

    mountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn);

  }

}



// Relabel directory