Reland "binder: Parcel avoid too small initial allocation"
Bug: 150149045
This reverts commit ce3262092e3c291e081f0df43d3546a674b58510.
Reason for revert: reland original fix after fixing android.os.cts.ParcelTest
The place where the default size is changed here from the original CL.
Now, when explicit setDataCapacity calls are made, we no longer use an
artificially larger size.
Test: atest android.os.cts.ParcelTest
Test: atest binderAllocationLimits
Change-Id: I08c5eeb3be0b61ccf2f5e34b5bc7b45f58f8cbcb
diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 1d94bd6..63197b0 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -2609,7 +2609,7 @@
size_t newSize = ((mDataSize+len)*3)/2;
return (newSize <= mDataSize)
? (status_t) NO_MEMORY
- : continueWrite(newSize);
+ : continueWrite(std::max(newSize, (size_t) 128));
}
status_t Parcel::restartWrite(size_t desired)
diff --git a/libs/binder/TEST_MAPPING b/libs/binder/TEST_MAPPING
index c03abca..c232283 100644
--- a/libs/binder/TEST_MAPPING
+++ b/libs/binder/TEST_MAPPING
@@ -7,6 +7,9 @@
"name": "binderVendorDoubleLoadTest"
},
{
+ "name": "binderAllocationLimits"
+ },
+ {
"name": "binderDriverInterfaceTest"
},
{
diff --git a/libs/binder/tests/Android.bp b/libs/binder/tests/Android.bp
index 69fdd7c..9dad969 100644
--- a/libs/binder/tests/Android.bp
+++ b/libs/binder/tests/Android.bp
@@ -164,3 +164,18 @@
test_suites: ["device-tests"],
require_root: true,
}
+
+cc_test {
+ name: "binderAllocationLimits",
+ defaults: ["binder_test_defaults"],
+ srcs: ["binderAllocationLimits.cpp"],
+ shared_libs: [
+ "libbinder",
+ "liblog",
+ "libutils",
+ "libutilscallstack",
+ "libbase",
+ ],
+ test_suites: ["device-tests"],
+ require_root: true,
+}
diff --git a/libs/binder/tests/binderAllocationLimits.cpp b/libs/binder/tests/binderAllocationLimits.cpp
new file mode 100644
index 0000000..e1f5ed5
--- /dev/null
+++ b/libs/binder/tests/binderAllocationLimits.cpp
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include <android-base/logging.h>
+#include <binder/Parcel.h>
+#include <binder/IServiceManager.h>
+#include <gtest/gtest.h>
+#include <utils/CallStack.h>
+
+#include <malloc.h>
+#include <functional>
+#include <vector>
+
+struct DestructionAction {
+ DestructionAction(std::function<void()> f) : mF(std::move(f)) {}
+ ~DestructionAction() { mF(); };
+private:
+ std::function<void()> mF;
+};
+
+// Group of hooks
+struct MallocHooks {
+ decltype(__malloc_hook) malloc_hook;
+ decltype(__realloc_hook) realloc_hook;
+
+ static MallocHooks save() {
+ return {
+ .malloc_hook = __malloc_hook,
+ .realloc_hook = __realloc_hook,
+ };
+ }
+
+ void overwrite() const {
+ __malloc_hook = malloc_hook;
+ __realloc_hook = realloc_hook;
+ }
+};
+
+static const MallocHooks orig_malloc_hooks = MallocHooks::save();
+
+// When malloc is hit, executes lambda.
+namespace LambdaHooks {
+ using AllocationHook = std::function<void(size_t)>;
+ static std::vector<AllocationHook> lambdas = {};
+
+ static void* lambda_realloc_hook(void* ptr, size_t bytes, const void* arg);
+ static void* lambda_malloc_hook(size_t bytes, const void* arg);
+
+ static const MallocHooks lambda_malloc_hooks = {
+ .malloc_hook = lambda_malloc_hook,
+ .realloc_hook = lambda_realloc_hook,
+ };
+
+ static void* lambda_malloc_hook(size_t bytes, const void* arg) {
+ {
+ orig_malloc_hooks.overwrite();
+ lambdas.at(lambdas.size() - 1)(bytes);
+ lambda_malloc_hooks.overwrite();
+ }
+ return orig_malloc_hooks.malloc_hook(bytes, arg);
+ }
+
+ static void* lambda_realloc_hook(void* ptr, size_t bytes, const void* arg) {
+ {
+ orig_malloc_hooks.overwrite();
+ lambdas.at(lambdas.size() - 1)(bytes);
+ lambda_malloc_hooks.overwrite();
+ }
+ return orig_malloc_hooks.realloc_hook(ptr, bytes, arg);
+ }
+
+}
+
+// Action to execute when malloc is hit. Supports nesting. Malloc is not
+// restricted when the allocation hook is being processed.
+__attribute__((warn_unused_result))
+DestructionAction OnMalloc(LambdaHooks::AllocationHook f) {
+ MallocHooks before = MallocHooks::save();
+ LambdaHooks::lambdas.emplace_back(std::move(f));
+ LambdaHooks::lambda_malloc_hooks.overwrite();
+ return DestructionAction([before]() {
+ before.overwrite();
+ LambdaHooks::lambdas.pop_back();
+ });
+}
+
+// exported symbol, to force compiler not to optimize away pointers we set here
+const void* imaginary_use;
+
+TEST(TestTheTest, OnMalloc) {
+ size_t mallocs = 0;
+ {
+ const auto on_malloc = OnMalloc([&](size_t bytes) {
+ mallocs++;
+ EXPECT_EQ(bytes, 40);
+ });
+
+ imaginary_use = new int[10];
+ }
+ EXPECT_EQ(mallocs, 1);
+}
+
+
+__attribute__((warn_unused_result))
+DestructionAction ScopeDisallowMalloc() {
+ return OnMalloc([&](size_t bytes) {
+ ADD_FAILURE() << "Unexpected allocation: " << bytes;
+ using android::CallStack;
+ std::cout << CallStack::stackToString("UNEXPECTED ALLOCATION", CallStack::getCurrent(4 /*ignoreDepth*/).get())
+ << std::endl;
+ });
+}
+
+using android::IBinder;
+using android::Parcel;
+using android::String16;
+using android::defaultServiceManager;
+using android::sp;
+using android::IServiceManager;
+
+static sp<IBinder> GetRemoteBinder() {
+ // This gets binder representing the service manager
+ // the current IServiceManager API doesn't expose the binder, and
+ // I want to avoid adding usages of the AIDL generated interface it
+ // is using underneath, so to avoid people copying it.
+ sp<IBinder> binder = defaultServiceManager()->checkService(String16("manager"));
+ EXPECT_NE(nullptr, binder);
+ return binder;
+}
+
+TEST(BinderAllocation, ParcelOnStack) {
+ const auto m = ScopeDisallowMalloc();
+ Parcel p;
+ imaginary_use = p.data();
+}
+
+TEST(BinderAllocation, GetServiceManager) {
+ defaultServiceManager(); // first call may alloc
+ const auto m = ScopeDisallowMalloc();
+ defaultServiceManager();
+}
+
+// note, ping does not include interface descriptor
+TEST(BinderAllocation, PingTransaction) {
+ sp<IBinder> a_binder = GetRemoteBinder();
+ const auto m = ScopeDisallowMalloc();
+ a_binder->pingBinder();
+}
+
+TEST(BinderAllocation, SmallTransaction) {
+ String16 empty_descriptor = String16("");
+ sp<IServiceManager> manager = defaultServiceManager();
+
+ size_t mallocs = 0;
+ const auto on_malloc = OnMalloc([&](size_t bytes) {
+ mallocs++;
+ // Parcel should allocate a small amount by default
+ EXPECT_EQ(bytes, 128);
+ });
+ manager->checkService(empty_descriptor);
+
+ EXPECT_EQ(mallocs, 1);
+}
+
+int main(int argc, char** argv) {
+ if (getenv("LIBC_HOOKS_ENABLE") == nullptr) {
+ CHECK(0 == setenv("LIBC_HOOKS_ENABLE", "1", true /*overwrite*/));
+ execv(argv[0], argv);
+ return 1;
+ }
+ ::testing::InitGoogleTest(&argc, argv);
+ return RUN_ALL_TESTS();
+}