Detect shareduid between different partitions

Find shareduid usage between the partitions(system, vendor, product).

Here is sample output

{
  "android.uid.system": {
    "product": [
      "Settings.apk"
    ],
    "system": [
      "framework-res.apk",
      "FusedLocation.apk",
      "Telecom.apk",
      "InputDevices.apk",
      "SettingsProvider.apk",
      "WallpaperBackup.apk",
      "KeyChain.apk"
    ]
  }
}

Bug: 123664116
Test: m -j out/target/product/$(get_build_var TARGET_DEVICE)/shareduid_violation_modules.txt
Change-Id: If2a75bf66b369cd3fad1744d08b6bfbfc624979c

core/tasks/find-shareduid-violation.mk

@@ -0,0 +1,32 @@
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+shareduid_violation_modules_filename := $(PRODUCT_OUT)/shareduid_violation_modules.json
+
+find_shareduid_script := $(BUILD_SYSTEM)/tasks/find-shareduid-violation.py
+
+$(shareduid_violation_modules_filename): $(INSTALLED_SYSTEMIMAGE_TARGET) \
+    $(INSTALLED_RAMDISK_TARGET) \
+    $(INSTALLED_BOOTIMAGE_TARGET) \
+    $(INSTALLED_USERDATAIMAGE_TARGET) \
+    $(INSTALLED_VENDORIMAGE_TARGET) \
+    $(INSTALLED_PRODUCTIMAGE_TARGET) \
+    $(INSTALLED_PRODUCT_SERVICESIMAGE_TARGET)
+
+$(shareduid_violation_modules_filename): $(find_shareduid_script)
+$(shareduid_violation_modules_filename): $(AAPT2)
+	$(find_shareduid_script) $(PRODUCT_OUT) $(AAPT2) > $@
+$(call dist-for-goals,droidcore,$(shareduid_violation_modules_filename))

core/tasks/find-shareduid-violation.py

@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+import os
+import subprocess
+from glob import glob
+from collections import defaultdict
+import sys
+import json
+
+if len(sys.argv) < 3:
+    product_out = os.environ["PRODUCT_OUT"]
+    aapt = "aapt2"
+else:
+    product_out = sys.argv[1]
+    aapt = sys.argv[2]
+
+def make_aapt_cmd(file):
+    cmds = [aapt + ' dump ' + file + ' --file AndroidManifest.xml',
+            aapt + ' dump xmltree ' + file + ' --file AndroidManifest.xml']
+    return " || ".join(cmds)
+
+def extract_shared_uid(file):
+    manifest = subprocess.check_output(make_aapt_cmd(file), shell=True).decode().split('\n')
+    for l in manifest:
+        if "sharedUserId" in l:
+            return l.split('"')[-2]
+    return None
+
+
+partitions = ["system", "vendor", "product"]
+
+shareduid_app_dict = defaultdict(list)
+
+for p in partitions:
+    for f in glob(os.path.join(product_out, p, "*", "*", "*.apk")):
+        apk_file = os.path.basename(f)
+        shared_uid = extract_shared_uid(f)
+
+        if shared_uid is None:
+            continue
+        shareduid_app_dict[shared_uid].append((p, apk_file))
+
+
+output = defaultdict(lambda: defaultdict(list))
+
+for uid, app_infos in shareduid_app_dict.items():
+    partitions = {p for p, _ in app_infos}
+    if len(partitions) > 1:
+        for part in partitions:
+            output[uid][part].extend([a for p, a in app_infos if p == part])
+
+print(json.dumps(output, indent=2, sort_keys=True))