Implement new method to get process base address in Windows sandbox.

sandbox/win/src/win_utils_unittest.cc

Index: sandbox/win/src/win_utils_unittest.cc
diff --git a/sandbox/win/src/win_utils_unittest.cc b/sandbox/win/src/win_utils_unittest.cc
index 7500798102a8c76fbb2b7e1bcc8a478880abc825..50ded5191531f4f7f3c038505045f05e824a7f51 100644
--- a/sandbox/win/src/win_utils_unittest.cc
+++ b/sandbox/win/src/win_utils_unittest.cc
@@ -3,13 +3,55 @@
 // found in the LICENSE file.
 
 #include <windows.h>
+#include <psapi.h>
 
+#include <vector>
+
+#include "base/numerics/safe_conversions.h"
 #include "base/win/scoped_handle.h"
+#include "base/win/scoped_process_information.h"
 #include "sandbox/win/src/nt_internals.h"
 #include "sandbox/win/src/win_utils.h"
 #include "sandbox/win/tests/common/test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace {
+
+class ScopedTerminateProcess {
+ public:
+  ScopedTerminateProcess(HANDLE process) : process_(process) {}
+
+  ~ScopedTerminateProcess() { ::TerminateProcess(process_, 0); }
+
+ private:
+  HANDLE process_;
+};
+
+bool GetModuleList(HANDLE process, std::vector<HMODULE>* result) {
+  std::vector<HMODULE> modules(256);
+  DWORD size_needed = 0;
+  if (EnumProcessModules(
+          process, &modules[0],
+          base::checked_cast<DWORD>(modules.size() * sizeof(HMODULE)),
+          &size_needed)) {
+    result->assign(modules.begin(),
+                   modules.begin() + (size_needed / sizeof(HMODULE)));
+    return true;
+  }
+  modules.resize(size_needed / sizeof(HMODULE));
+  if (EnumProcessModules(
+          process, &modules[0],
+          base::checked_cast<DWORD>(modules.size() * sizeof(HMODULE)),
+          &size_needed)) {
+    result->assign(modules.begin(),
+                   modules.begin() + (size_needed / sizeof(HMODULE)));
+    return true;
+  }
+  return false;
+}
+
+}  // namespace
+
 TEST(WinUtils, IsReparsePoint) {
   using sandbox::IsReparsePoint;
 
@@ -122,3 +164,48 @@ TEST(WinUtils, NtStatusToWin32Error) {
   EXPECT_EQ(static_cast<DWORD>(ERROR_ACCESS_DENIED),
             GetLastErrorFromNtStatus(STATUS_ACCESS_DENIED));
 }
+
+TEST(WinUtils, GetProcessBaseAddress) {
+  using sandbox::GetProcessBaseAddress;
+  STARTUPINFO start_info = {};
+  PROCESS_INFORMATION proc_info = {};
+  WCHAR command_line[] = L"notepad";
+  start_info.cb = sizeof(start_info);
+  start_info.dwFlags = STARTF_USESHOWWINDOW;
+  start_info.wShowWindow = SW_HIDE;
+  EXPECT_TRUE(::CreateProcessW(nullptr, command_line, nullptr, nullptr, FALSE,
+                               CREATE_SUSPENDED, nullptr, nullptr, &start_info,
+                               &proc_info));
+  base::win::ScopedProcessInformation scoped_proc_info(proc_info);
+  ScopedTerminateProcess process_terminate(scoped_proc_info.process_handle());
+  void* base_address = GetProcessBaseAddress(scoped_proc_info.process_handle());
+  EXPECT_NE(nullptr, base_address);
+  EXPECT_NE(static_cast<DWORD>(-1),
+            ::ResumeThread(scoped_proc_info.thread_handle()));
+  ::WaitForInputIdle(scoped_proc_info.process_handle(), 1000);
+  EXPECT_NE(static_cast<DWORD>(-1),
+            ::SuspendThread(scoped_proc_info.thread_handle()));
+  // Check again, the process will have done some more memory initialization.
+  EXPECT_EQ(base_address,
+            GetProcessBaseAddress(scoped_proc_info.process_handle()));
+
+  std::vector<HMODULE> modules;
+  // Compare against the loader's module list (which should now be initialized).
+  // GetModuleList could fail if the target process hasn't fully initialized.
+  // If so skip this check and log it as a warning.
+  if (GetModuleList(scoped_proc_info.process_handle(), &modules) &&
+      modules.size() > 0) {
+    // First module should be the main executable.
+    EXPECT_EQ(base_address, modules[0]);
+  } else {
+    LOG(WARNING) << "Couldn't test base address against module list";
+  }
+  // Fill in some of the virtual memory with 10MiB chunks and try again.
+  for (int count = 0; count < 100; ++count) {
+    EXPECT_NE(nullptr,
+              ::VirtualAllocEx(scoped_proc_info.process_handle(), nullptr,
+                               10 * 1024 * 1024, MEM_RESERVE, PAGE_NOACCESS));
+  }
+  EXPECT_EQ(base_address,
+            GetProcessBaseAddress(scoped_proc_info.process_handle()));
+}