From ca3b7743aea74bbb7185f1aac53494ac3e86c26a Mon Sep 17 00:00:00 2001
From: "caitkp@chromium.org"
 <caitkp@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Thu, 16 Jan 2014 15:46:33 +0000
Subject: 1. Make sure chrome_elf.dll imports nothing besides kernel32,
 advapi32, and some msvc libs (DEBUG builds) 2. Add gyp action and test to
 ensure chrome_elf.dll is always the first entry in chrome.exe's import table.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=242834

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=243048

Review URL: https://codereview.chromium.org/109483003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245197 0039d316-1c4b-4281-b951-d872f2087c98
---
 chrome_elf/chrome_elf.gyp          |  1 +
 chrome_elf/elf_imports_unittest.cc | 94 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)
 create mode 100644 chrome_elf/elf_imports_unittest.cc

(limited to 'chrome_elf')

diff --git a/chrome_elf/chrome_elf.gyp b/chrome_elf/chrome_elf.gyp
index 8a4e87e..92c8294 100644
--- a/chrome_elf/chrome_elf.gyp
+++ b/chrome_elf/chrome_elf.gyp
@@ -45,6 +45,7 @@
       'type': 'executable',
       'sources': [
         'blacklist/test/blacklist_test.cc',
+        'elf_imports_unittest.cc',
         'ntdll_cache_unittest.cc',
       ],
       'include_dirs': [
diff --git a/chrome_elf/elf_imports_unittest.cc b/chrome_elf/elf_imports_unittest.cc
new file mode 100644
index 0000000..8fcad97
--- /dev/null
+++ b/chrome_elf/elf_imports_unittest.cc
@@ -0,0 +1,94 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <stdint.h>
+#include <windows.h>
+
+#include <algorithm>
+#include <vector>
+
+#include "base/base_paths.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/files/file_path.h"
+#include "base/files/memory_mapped_file.h"
+#include "base/path_service.h"
+#include "base/strings/string_util.h"
+#include "base/win/pe_image.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+class ELFImportsTest : public testing::Test {
+ protected:
+  static bool ImportsCallback(const base::win::PEImage &image,
+                              LPCSTR module,
+                              PIMAGE_THUNK_DATA name_table,
+                              PIMAGE_THUNK_DATA iat,
+                              PVOID cookie) {
+    std::vector<std::string>* import_list =
+        reinterpret_cast<std::vector<std::string>*>(cookie);
+    import_list->push_back(module);
+    return true;
+  }
+
+  void GetImports(const base::FilePath& module_path,
+                  std::vector<std::string>* imports) {
+    ASSERT_TRUE(imports != NULL);
+
+    base::MemoryMappedFile module_mmap;
+
+    ASSERT_TRUE(module_mmap.Initialize(module_path));
+    base::win::PEImageAsData pe_image_data(
+        reinterpret_cast<HMODULE>(const_cast<uint8*>(module_mmap.data())));
+    pe_image_data.EnumImportChunks(ELFImportsTest::ImportsCallback, imports);
+  }
+};
+
+TEST_F(ELFImportsTest, ChromeElfSanityCheck) {
+  std::vector<std::string> elf_imports;
+
+  base::FilePath dll;
+  ASSERT_TRUE(PathService::Get(base::DIR_EXE, &dll));
+  dll = dll.Append(L"chrome_elf.dll");
+  GetImports(dll, &elf_imports);
+
+  // Check that ELF has imports.
+  ASSERT_LT(0u, elf_imports.size());
+
+  std::vector<std::string>::iterator it(elf_imports.begin());
+
+  static const char* const kValidFilePatterns[] = {
+      "KERNEL32.dll",
+      "MSVC*",
+      "ADVAPI32.dll"};
+
+  // Make sure all of ELF's imports are in the valid imports list.
+  for (; it != elf_imports.end(); it++) {
+    bool match = false;
+    for (int i = 0; i < arraysize(kValidFilePatterns); ++i) {
+      if (MatchPattern(*it, kValidFilePatterns[i]))
+        match = true;
+    }
+    ASSERT_TRUE(match) << "Illegal import in chrome_elf.dll.";
+  }
+}
+
+TEST_F(ELFImportsTest, ChromeExeSanityCheck) {
+  std::vector<std::string> exe_imports;
+
+  base::FilePath exe;
+  ASSERT_TRUE(PathService::Get(base::DIR_EXE, &exe));
+  exe = exe.Append(L"chrome.exe");
+  GetImports(exe, &exe_imports);
+
+  // Check that chrome.exe has imports.
+  ASSERT_LT(0u, exe_imports.size());
+
+  // Chrome.exe's first import must be ELF.
+  EXPECT_EQ("chrome_elf.dll", exe_imports[0]) <<
+      "Illegal import order in chrome.exe";
+}
+
+}  // namespace
-- 
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