Use libbinderthreadstateutils.

Clients needing to differentiate between system/vendor used to be able
to use isServingCall. However, this was expensive to implement. This
alternative approach instead requires users of this API to use
libbinderthreadstateutils which does a slighty different operation.

Bug: 148692216
Test: atest VtsHalCameraServiceV2_0TargetTest
Test: running AImageReaderVendorTest
Test: try face unlock
Change-Id: I5615f4e8863487d0de8dad2d0529214750897036

camera/include/camera/VendorTagDescriptor.h

@@ -188,8 +188,8 @@ class VendorTagDescriptorCache : public Parcelable {
             sp<android::VendorTagDescriptor> *desc /*out*/);
 
     // Parcelable interface
-    status_t writeToParcel(Parcel* parcel) const override;
+    status_t writeToParcel(android::Parcel* parcel) const override;
-    status_t readFromParcel(const Parcel* parcel) override;
+    status_t readFromParcel(const android::Parcel* parcel) override;
 
     // Returns the number of vendor tags defined.
     int getTagCount(metadata_vendor_id_t id) const;

services/camera/libcameraservice/Android.bp

@@ -129,6 +129,10 @@ cc_library_shared {
         "android.hardware.camera.device@3.6"
     ],
 
+    static_libs: [
+        "libbinderthreadstateutils",
+    ],
+
     export_shared_lib_headers: [
         "libbinder",
         "libcamera_client",

services/camera/libcameraservice/CameraService.cpp

@@ -43,6 +43,7 @@
 #include <binder/PermissionController.h>
 #include <binder/ProcessInfoService.h>
 #include <binder/IResultReceiver.h>
+#include <binderthreadstate/CallerUtils.h>
 #include <cutils/atomic.h>
 #include <cutils/properties.h>
 #include <cutils/misc.h>
@@ -1179,7 +1180,7 @@ Status CameraService::validateClientPermissionsLocked(const String8& cameraId,
 
     // Only allow clients who are being used by the current foreground device user, unless calling
     // from our own process OR the caller is using the cameraserver's HIDL interface.
-    if (!hardware::IPCThreadState::self()->isServingCall() && callingPid != getpid() &&
+    if (getCurrentServingCall() != BinderCallType::HWBINDER && callingPid != getpid() &&
             (mAllowedUsers.find(clientUserId) == mAllowedUsers.end())) {
         ALOGE("CameraService::connect X (PID %d) rejected (cannot connect from "
                 "device user %d, currently allowed device users: %s)", callingPid, clientUserId,
@@ -1534,7 +1535,7 @@ bool CameraService::shouldRejectSystemCameraConnection(const String8& cameraId)
         return false;
     }
     // (2)
-    if (!hardware::IPCThreadState::self()->isServingCall() &&
+    if (getCurrentServingCall() != BinderCallType::HWBINDER &&
             systemCameraKind == SystemCameraKind::HIDDEN_SECURE_CAMERA) {
         ALOGW("Rejecting access to secure hidden camera %s", cameraId.c_str());
         return true;
@@ -1543,7 +1544,7 @@ bool CameraService::shouldRejectSystemCameraConnection(const String8& cameraId)
     //     getCameraCharacteristics() allows for calls to succeed (albeit after hiding some
     //     characteristics) even if clients don't have android.permission.CAMERA. We do not want the
     //     same behavior for system camera devices.
-    if (!hardware::IPCThreadState::self()->isServingCall() &&
+    if (getCurrentServingCall() != BinderCallType::HWBINDER &&
             systemCameraKind == SystemCameraKind::SYSTEM_ONLY_CAMERA &&
             !hasPermissionsForSystemCamera(cPid, cUid)) {
         ALOGW("Rejecting access to system only camera %s, inadequete permissions",
@@ -1569,7 +1570,7 @@ Status CameraService::connectDevice(
     sp<CameraDeviceClient> client = nullptr;
     String16 clientPackageNameAdj = clientPackageName;
 
-    if (hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() == BinderCallType::HWBINDER) {
         std::string vendorClient =
                 StringPrintf("vendor.client.pid<%d>", CameraThreadState::getCallingPid());
         clientPackageNameAdj = String16(vendorClient.c_str());
@@ -2778,7 +2779,7 @@ CameraService::BasicClient::BasicClient(const sp<CameraService>& cameraService,
         }
         mClientPackageName = packages[0];
     }
-    if (!hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() != BinderCallType::HWBINDER) {
         mAppOpsManager = std::make_unique<AppOpsManager>();
     }
 }
@@ -3450,7 +3451,7 @@ CameraService::DescriptorPtr CameraService::CameraClientManager::makeClientDescr
         const std::set<String8>& conflictingKeys, int32_t score, int32_t ownerId,
         int32_t state) {
 
-    bool isVendorClient = hardware::IPCThreadState::self()->isServingCall();
+    bool isVendorClient = getCurrentServingCall() == BinderCallType::HWBINDER;
     int32_t score_adj = isVendorClient ? kVendorClientScore : score;
     int32_t state_adj = isVendorClient ? kVendorClientState: state;
 

services/camera/libcameraservice/utils/CameraThreadState.cpp

@@ -17,33 +17,34 @@
 #include "CameraThreadState.h"
 #include <binder/IPCThreadState.h>
 #include <hwbinder/IPCThreadState.h>
+#include <binderthreadstate/CallerUtils.h>
 #include <unistd.h>
 
 namespace android {
 
 int CameraThreadState::getCallingUid() {
-    if (hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() == BinderCallType::HWBINDER) {
         return hardware::IPCThreadState::self()->getCallingUid();
     }
     return IPCThreadState::self()->getCallingUid();
 }
 
 int CameraThreadState::getCallingPid() {
-    if (hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() == BinderCallType::HWBINDER) {
         return hardware::IPCThreadState::self()->getCallingPid();
     }
     return IPCThreadState::self()->getCallingPid();
 }
 
 int64_t CameraThreadState::clearCallingIdentity() {
-    if (hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() == BinderCallType::HWBINDER) {
         return hardware::IPCThreadState::self()->clearCallingIdentity();
     }
     return IPCThreadState::self()->clearCallingIdentity();
 }
 
 void CameraThreadState::restoreCallingIdentity(int64_t token) {
-    if (hardware::IPCThreadState::self()->isServingCall()) {
+    if (getCurrentServingCall() == BinderCallType::HWBINDER) {
         hardware::IPCThreadState::self()->restoreCallingIdentity(token);
     } else {
         IPCThreadState::self()->restoreCallingIdentity(token);

services/camera/libcameraservice/utils/ClientManager.h

@@ -35,7 +35,7 @@ class ClientPriority {
 public:
     /**
      * Choosing to set mIsVendorClient through a parameter instead of calling
-     * hardware::IPCThreadState::self()->isServingCall() to protect against the
+     * getCurrentServingCall() == BinderCallType::HWBINDER to protect against the
      * case where the construction is offloaded to another thread which isn't a
      * hwbinder thread.
      */
@@ -237,7 +237,7 @@ void ClientDescriptor<KEY, VALUE>::setPriority(const ClientPriority& priority) {
     // We don't use the usual copy constructor here since we want to remember
     // whether a client is a vendor client or not. This could have been wiped
     // off in the incoming priority argument since an AIDL thread might have
-    // called hardware::IPCThreadState::self()->isServingCall() after refreshing
+    // called getCurrentServingCall() == BinderCallType::HWBINDER after refreshing
     // priorities for old clients through ProcessInfoService::getProcessStatesScoresFromPids().
     mPriority.setScore(priority.getScore());
     mPriority.setState(priority.getState());