Introduce wvmkiller

This lets us disable WVM L1 on boot up for devices where it's not
provisioned properly.

Change-Id: I6074a9fad4235ac7896851f3cd4e9ea8bf288994

wvmkiller/.clang-format

@@ -0,0 +1 @@
+../../../build/soong/scripts/system-clang-format

wvmkiller/Android.bp

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+cc_binary {
+    name: "wvmkiller",
+    defaults: ["hidl_defaults"],
+    init_rc: ["wvmkiller.rc"],
+    vendor: true,
+    srcs: ["main.cpp"],
+    shared_libs: [
+        "android.hardware.drm@1.0",
+        "libbase",
+        "libhidlbase",
+        "libutils",
+    ],
+}

wvmkiller/main.cpp

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+/*
+ * Copyright (C) 2024 The LineageOS 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.
+ */
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android/hardware/drm/1.0/IDrmFactory.h>
+
+using android::sp;
+using android::base::SetProperty;
+using android::hardware::hidl_array;
+using android::hardware::hidl_string;
+using android::hardware::drm::V1_0::IDrmFactory;
+using android::hardware::drm::V1_0::IDrmPlugin;
+using android::hardware::drm::V1_0::Status;
+
+int main() {
+    const uint8_t WIDEVINE_UUID[] = {0xED, 0xEF, 0x8B, 0xA9, 0x79, 0xD6, 0x4A, 0xCE,
+                                     0xA3, 0xC8, 0x27, 0xDC, 0xD5, 0x1D, 0x21, 0xED};
+
+    const auto callback = [](Status status, const sp<IDrmPlugin>& drmPlugin) {
+        CHECK(status == Status::OK);
+
+        drmPlugin->getPropertyString("systemId", [](Status status, const hidl_string& value) {
+            CHECK(status == Status::OK);
+
+            if (value.size() > 5) {
+                SetProperty("vendor.wvm.disable_l1", "1");
+            }
+        });
+    };
+
+    const auto drmFactory = IDrmFactory::getService("widevine");
+    CHECK(drmFactory.get() != nullptr);
+
+    drmFactory->createPlugin(hidl_array<uint8_t, 16>(WIDEVINE_UUID), "org.lineageos.wvmkiller",
+                             callback);
+
+    return 0;
+}

wvmkiller/wvmkiller.rc

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+on property:vendor.wvm.disable_l1=1
+    export FORCE_LEVEL3_OEMCRYPTO yes
+    restart vendor.drm-widevine-hal-1-3
+
+service vendor.wvmkiller /vendor/bin/wvmkiller
+    class late_start
+    user system
+    group system
+    oneshot