Add CheckedMachAddressRange and its test

util/mac/checked_mach_address_range_test.cc

Index: util/mac/checked_mach_address_range_test.cc
diff --git a/util/mac/checked_mach_address_range_test.cc b/util/mac/checked_mach_address_range_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..392121dcc741c894a66b7d5cb9d64dc1989458e0
--- /dev/null
+++ b/util/mac/checked_mach_address_range_test.cc
@@ -0,0 +1,256 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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 "util/mac/checked_mach_address_range.h"
+
+#include <mach/mach.h>
+
+#include <limits>
+
+#include "base/basictypes.h"
+#include "base/strings/stringprintf.h"
+#include "build/build_config.h"
+#include "gtest/gtest.h"
+#include "util/mac/process_reader.h"
+
+namespace {
+
+using namespace crashpad;
+
+#if defined(ARCH_CPU_64_BITS)
+const bool kValid64Invalid32 = true;
+#else
+const bool kValid64Invalid32 = false;
+#endif
+
+TEST(CheckedMachAddressRange, IsValid) {
+  const struct TestData {
+    mach_vm_address_t base;
+    mach_vm_size_t size;
+    bool valid;
+  } kTestData[] = {
+      {0, 0, true},
+      {0, 1, true},
+      {0, 2, true},
+      {0, 0x7fffffff, true},
+      {0, 0x80000000, true},
+      {0, 0xfffffffe, true},
+      {0, 0xffffffff, true},
+      {0, 0xffffffffffffffff, kValid64Invalid32},
+      {1, 0, true},
+      {1, 1, true},
+      {1, 2, true},
+      {1, 0x7fffffff, true},
+      {1, 0x80000000, true},
+      {1, 0xfffffffe, true},
+      {1, 0xffffffff, kValid64Invalid32},
+      {1, 0xfffffffffffffffe, kValid64Invalid32},
+      {1, 0xffffffffffffffff, false},
+      {0x7fffffff, 0, true},
+      {0x7fffffff, 1, true},
+      {0x7fffffff, 2, true},
+      {0x7fffffff, 0x7fffffff, true},
+      {0x7fffffff, 0x80000000, true},
+      {0x7fffffff, 0xfffffffe, kValid64Invalid32},
+      {0x7fffffff, 0xffffffff, kValid64Invalid32},
+      {0x80000000, 0, true},
+      {0x80000000, 1, true},
+      {0x80000000, 2, true},
+      {0x80000000, 0x7fffffff, true},
+      {0x80000000, 0x80000000, kValid64Invalid32},
+      {0x80000000, 0xfffffffe, kValid64Invalid32},
+      {0x80000000, 0xffffffff, kValid64Invalid32},
+      {0xfffffffe, 0, true},
+      {0xfffffffe, 1, true},
+      {0xfffffffe, 2, kValid64Invalid32},
+      {0xfffffffe, 0x7fffffff, kValid64Invalid32},
+      {0xfffffffe, 0x80000000, kValid64Invalid32},
+      {0xfffffffe, 0xfffffffe, kValid64Invalid32},
+      {0xfffffffe, 0xffffffff, kValid64Invalid32},
+      {0xffffffff, 0, true},
+      {0xffffffff, 1, kValid64Invalid32},
+      {0xffffffff, 2, kValid64Invalid32},
+      {0xffffffff, 0x7fffffff, kValid64Invalid32},
+      {0xffffffff, 0x80000000, kValid64Invalid32},
+      {0xffffffff, 0xfffffffe, kValid64Invalid32},
+      {0xffffffff, 0xffffffff, kValid64Invalid32},
+      {0x7fffffffffffffff, 0, kValid64Invalid32},
+      {0x7fffffffffffffff, 1, kValid64Invalid32},
+      {0x7fffffffffffffff, 2, kValid64Invalid32},
+      {0x7fffffffffffffff, 0x7fffffffffffffff, kValid64Invalid32},
+      {0x7fffffffffffffff, 0x8000000000000000, kValid64Invalid32},
+      {0x7fffffffffffffff, 0x8000000000000001, false},
+      {0x7fffffffffffffff, 0xfffffffffffffffe, false},
+      {0x7fffffffffffffff, 0xffffffffffffffff, false},
+      {0x8000000000000000, 0, kValid64Invalid32},
+      {0x8000000000000000, 1, kValid64Invalid32},
+      {0x8000000000000000, 2, kValid64Invalid32},
+      {0x8000000000000000, 0x7fffffffffffffff, kValid64Invalid32},
+      {0x8000000000000000, 0x8000000000000000, false},
+      {0x8000000000000000, 0x8000000000000001, false},
+      {0x8000000000000000, 0xfffffffffffffffe, false},
+      {0x8000000000000000, 0xffffffffffffffff, false},
+      {0xfffffffffffffffe, 0, kValid64Invalid32},
+      {0xfffffffffffffffe, 1, kValid64Invalid32},
+      {0xfffffffffffffffe, 2, false},
+      {0xffffffffffffffff, 0, kValid64Invalid32},
+      {0xffffffffffffffff, 1, false},
+  };
+
+  ProcessReader process_reader;
+  ASSERT_TRUE(process_reader.Initialize(mach_task_self()));
+
+  for (size_t index = 0; index < arraysize(kTestData); ++index) {
+    const TestData& testcase = kTestData[index];
+    SCOPED_TRACE(base::StringPrintf("index %zu, base 0x%llx, size 0x%llx",
+                                    index,
+                                    testcase.base,
+                                    testcase.size));
+
+    CheckedMachAddressRange range(
+        &process_reader, testcase.base, testcase.size);
+    EXPECT_EQ(testcase.valid, range.IsValid());
+  }
+}
+
+TEST(CheckedMachAddressRange, ContainsValue) {
+  const struct TestData {
+    mach_vm_address_t value;
+    bool valid;
+  } kTestData[] = {
+      {0, false},
+      {1, false},
+      {0x1fff, false},
+      {0x2000, true},
+      {0x2001, true},
+      {0x2ffe, true},
+      {0x2fff, true},
+      {0x3000, false},
+      {0x3001, false},
+      {0x7fffffff, false},
+      {0x80000000, false},
+      {0x80000001, false},
+      {0x80001fff, false},
+      {0x80002000, false},
+      {0x80002001, false},
+      {0x80002ffe, false},
+      {0x80002fff, false},
+      {0x80003000, false},
+      {0x80003001, false},
+      {0xffffcfff, false},
+      {0xffffdfff, false},
+      {0xffffefff, false},
+      {0xffffffff, false},
+      {0x100000000, false},
+      {0xffffffffffffffff, false},
+  };
+
+  ProcessReader process_reader;
+  ASSERT_TRUE(process_reader.Initialize(mach_task_self()));
+
+  CheckedMachAddressRange parent_range(&process_reader, 0x2000, 0x1000);
+  ASSERT_TRUE(parent_range.IsValid());
+
+  for (size_t index = 0; index < arraysize(kTestData); ++index) {
+    const TestData& testcase = kTestData[index];
+    SCOPED_TRACE(
+        base::StringPrintf("index %zu, value 0x%llx", index, testcase.value));
+
+    EXPECT_EQ(testcase.valid, parent_range.ContainsValue(testcase.value));
+  }
+
+  CheckedMachAddressRange parent_range_64(&process_reader, 0x100000000, 0x1000);
+  ASSERT_EQ(kValid64Invalid32, parent_range_64.IsValid());
+  if (parent_range_64.IsValid()) {
+    EXPECT_FALSE(parent_range_64.ContainsValue(0xffffffff));
+    EXPECT_TRUE(parent_range_64.ContainsValue(0x100000000));
+    EXPECT_TRUE(parent_range_64.ContainsValue(0x100000001));
+    EXPECT_TRUE(parent_range_64.ContainsValue(0x100000fff));
+    EXPECT_FALSE(parent_range_64.ContainsValue(0x100001000));
+  }
+}
+
+TEST(CheckedMachAddressRange, ContainsRange) {
+  const struct TestData {
+    mach_vm_address_t base;
+    mach_vm_size_t size;
+    bool valid;
+  } kTestData[] = {
+      {0, 0, false},
+      {0, 1, false},
+      {0x2000, 0x1000, true},
+      {0, 0x2000, false},
+      {0x3000, 0x1000, false},
+      {0x1800, 0x1000, false},
+      {0x2800, 0x1000, false},
+      {0x2000, 0x800, true},
+      {0x2800, 0x800, true},
+      {0x2400, 0x800, true},
+      {0x2800, 0, true},
+      {0x2000, 0xffffdfff, false},
+      {0x2800, 0xffffd7ff, false},
+      {0x3000, 0xffffcfff, false},
+      {0xfffffffe, 1, false},
+      {0xffffffff, 0, false},
+      {0x1fff, 0, false},
+      {0x2000, 0, true},
+      {0x2001, 0, true},
+      {0x2fff, 0, true},
+      {0x3000, 0, true},
+      {0x3001, 0, false},
+      {0x1fff, 1, false},
+      {0x2000, 1, true},
+      {0x2001, 1, true},
+      {0x2fff, 1, true},
+      {0x3000, 1, false},
+      {0x3001, 1, false},
+  };
+
+  ProcessReader process_reader;
+  ASSERT_TRUE(process_reader.Initialize(mach_task_self()));
+
+  CheckedMachAddressRange parent_range(&process_reader, 0x2000, 0x1000);
+  ASSERT_TRUE(parent_range.IsValid());
+
+  for (size_t index = 0; index < arraysize(kTestData); ++index) {
+    const TestData& testcase = kTestData[index];
+    SCOPED_TRACE(base::StringPrintf("index %zu, base 0x%llx, size 0x%llx",
+                                    index,
+                                    testcase.base,
+                                    testcase.size));
+
+    CheckedMachAddressRange child_range(
+        &process_reader, testcase.base, testcase.size);
+    ASSERT_TRUE(child_range.IsValid());
+    EXPECT_EQ(testcase.valid, parent_range.ContainsRange(child_range));
+  }
+
+  CheckedMachAddressRange parent_range_64(&process_reader, 0x100000000, 0x1000);
+  ASSERT_EQ(kValid64Invalid32, parent_range_64.IsValid());
+  if (parent_range_64.IsValid()) {
+    CheckedMachAddressRange child_range_64(&process_reader, 0xffffffff, 2);
+    EXPECT_FALSE(parent_range_64.ContainsRange(child_range_64));
+
+    child_range_64.SetRange(&process_reader, 0x100000000, 2);
+    EXPECT_TRUE(parent_range_64.ContainsRange(child_range_64));
+
+    child_range_64.SetRange(&process_reader, 0x100000ffe, 2);
+    EXPECT_TRUE(parent_range_64.ContainsRange(child_range_64));
+
+    child_range_64.SetRange(&process_reader, 0x100000fff, 2);
+    EXPECT_FALSE(parent_range_64.ContainsRange(child_range_64));
+  }
+}
+
+}  // namespace