libbinder_ndk: fix failure when dump/shell are unset
People directly using libbinder_ndk functions who didn't create a debug
dump function function would fail to initialize that pointer, and
potentially crash. Those who didn't create a shell function were
guaranteed to crash. This wasn't noticed because the C++ wrappers which
are the recommended way to use libbinder_ndk always set these functions.
Bug: 161812320
Test: unit tests
Merged-In: I1f6909531bc640097f3f48c4a558fd03f2fa62cb
Change-Id: I1f6909531bc640097f3f48c4a558fd03f2fa62cb
diff --git a/libs/binder/ndk/ibinder_internal.h b/libs/binder/ndk/ibinder_internal.h
index 5cb68c2..ca7588a 100644
--- a/libs/binder/ndk/ibinder_internal.h
+++ b/libs/binder/ndk/ibinder_internal.h
@@ -109,12 +109,12 @@
const ::android::String16& getInterfaceDescriptor() const { return mInterfaceDescriptor; }
// required to be non-null, implemented for every class
- const AIBinder_Class_onCreate onCreate;
- const AIBinder_Class_onDestroy onDestroy;
- const AIBinder_Class_onTransact onTransact;
+ const AIBinder_Class_onCreate onCreate = nullptr;
+ const AIBinder_Class_onDestroy onDestroy = nullptr;
+ const AIBinder_Class_onTransact onTransact = nullptr;
// optional methods for a class
- AIBinder_onDump onDump;
+ AIBinder_onDump onDump = nullptr;
private:
// This must be a String16 since BBinder virtual getInterfaceDescriptor returns a reference to
diff --git a/libs/binder/ndk/test/iface.cpp b/libs/binder/ndk/test/iface.cpp
index 64832f3..a588985 100644
--- a/libs/binder/ndk/test/iface.cpp
+++ b/libs/binder/ndk/test/iface.cpp
@@ -118,7 +118,7 @@
AIBinder_Weak_delete(mWeakBinder);
}
-binder_status_t IFoo::addService(const char* instance) {
+AIBinder* IFoo::getBinder() {
AIBinder* binder = nullptr;
if (mWeakBinder != nullptr) {
@@ -132,8 +132,18 @@
AIBinder_Weak_delete(mWeakBinder);
}
mWeakBinder = AIBinder_Weak_new(binder);
+
+ // WARNING: it is important that this class does not implement debug or
+ // shell functions because it does not use special C++ wrapper
+ // functions, and so this is how we test those functions.
}
+ return binder;
+}
+
+binder_status_t IFoo::addService(const char* instance) {
+ AIBinder* binder = getBinder();
+
binder_status_t status = AServiceManager_addService(binder, instance);
// Strong references we care about kept by remote process
AIBinder_decStrong(binder);
diff --git a/libs/binder/ndk/test/include/iface/iface.h b/libs/binder/ndk/test/include/iface/iface.h
index cdf5493..d9dd64b 100644
--- a/libs/binder/ndk/test/include/iface/iface.h
+++ b/libs/binder/ndk/test/include/iface/iface.h
@@ -30,6 +30,9 @@
static AIBinder_Class* kClass;
+ // binder representing this interface with one reference count
+ AIBinder* getBinder();
+
// Takes ownership of IFoo
binder_status_t addService(const char* instance);
static ::android::sp<IFoo> getService(const char* instance, AIBinder** outBinder = nullptr);
diff --git a/libs/binder/ndk/test/main_client.cpp b/libs/binder/ndk/test/main_client.cpp
index 8467734..bd30d8b 100644
--- a/libs/binder/ndk/test/main_client.cpp
+++ b/libs/binder/ndk/test/main_client.cpp
@@ -48,6 +48,14 @@
AIBinder_decStrong(binder);
}
+TEST(NdkBinder, UnimplementedDump) {
+ sp<IFoo> foo = IFoo::getService(IFoo::kSomeInstanceName);
+ ASSERT_NE(foo, nullptr);
+ AIBinder* binder = foo->getBinder();
+ EXPECT_EQ(STATUS_OK, AIBinder_dump(binder, STDOUT_FILENO, nullptr, 0));
+ AIBinder_decStrong(binder);
+}
+
TEST(NdkBinder, DoubleNumber) {
sp<IFoo> foo = IFoo::getService(IFoo::kSomeInstanceName);
ASSERT_NE(foo, nullptr);