contents/namespace/sphal.cc

/*
 * 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.
 */

// SP-HAL(Sameprocess-HAL)s are the only vendor libraries that are allowed to be
// loaded inside system processes. libEGL_<chipset>.so, libGLESv2_<chipset>.so,
// android.hardware.graphics.mapper@2.0-impl.so, etc are SP-HALs.
//
// This namespace is exclusivly for SP-HALs. When the framework tries to
// dynamically load SP-HALs, android_dlopen_ext() is used to explicitly specify
// that they should be searched and loaded from this namespace.
//
// Note that there is no link from the default namespace to this namespace.

#include "linkerconfig/namespacebuilder.h"

using android::linkerconfig::modules::AsanPath;
using android::linkerconfig::modules::Namespace;

namespace android {
namespace linkerconfig {
namespace contents {
Namespace BuildSphalNamespace([[maybe_unused]] const Context& ctx) {
  // Visible to allow use with android_dlopen_ext, and with
  // android_link_namespaces in libnativeloader.
  Namespace ns("sphal", /*is_isolated=*/true, /*is_visible=*/true);
  ns.AddSearchPath("/odm/${LIB}", AsanPath::WITH_DATA_ASAN);
  ns.AddSearchPath("/vendor/${LIB}", AsanPath::WITH_DATA_ASAN);
  ns.AddSearchPath("/vendor/${LIB}/hw", AsanPath::NONE);

  ns.AddPermittedPath("/odm/${LIB}", AsanPath::WITH_DATA_ASAN);
  ns.AddPermittedPath("/vendor/${LIB}", AsanPath::WITH_DATA_ASAN);
  ns.AddPermittedPath("/system/vendor/${LIB}", AsanPath::NONE);

  // Once in this namespace, access to libraries in /system/lib is restricted.
  // Only libs listed here can be used. Order is important here as the
  // namespaces are tried in this order. rs should be before vndk because both
  // are capable of loading libRS_internal.so
  ns.GetLink("rs").AddSharedLib("libRS_internal.so");
  ns.GetLink(ctx.GetSystemNamespaceName()).AddSharedLib("@{LLNDK_LIBRARIES:}");
  ns.GetLink("vndk").AddSharedLib("@{VNDK_SAMEPROCESS_LIBRARIES:}");
  ns.GetLink("neuralnetworks").AddSharedLib("libneuralnetworks.so");

  return ns;
}
}  // namespace contents
}  // namespace linkerconfig
}  // namespace android