chrome_elf/thunk_getter.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <stdint.h>
   6 #include <windows.h>
   7
   8 #include "base/basictypes.h"
   9 #include "sandbox/win/src/interception_internal.h"
  10 #include "sandbox/win/src/internal_types.h"
  11 #include "sandbox/win/src/sandbox_utils.h"
  12 #include "sandbox/win/src/service_resolver.h"
  13
  14 namespace {
  15 enum Version {
  16   VERSION_PRE_XP_SP2 = 0,  // Not supported.
  17   VERSION_XP_SP2,
  18   VERSION_SERVER_2003,  // Also includes XP Pro x64 and Server 2003 R2.
  19   VERSION_VISTA,        // Also includes Windows Server 2008.
  20   VERSION_WIN7,         // Also includes Windows Server 2008 R2.
  21   VERSION_WIN8,         // Also includes Windows Server 2012.
  22   VERSION_WIN8_1,
  23   VERSION_WIN10,
  24   VERSION_WIN_LAST,  // Indicates error condition.
  25 };
  26
  27 // Whether a process is running under WOW64 (the wrapper that allows 32-bit
  28 // processes to run on 64-bit versions of Windows).  This will return
  29 // WOW64_DISABLED for both "32-bit Chrome on 32-bit Windows" and "64-bit
  30 // Chrome on 64-bit Windows".  WOW64_UNKNOWN means "an error occurred", e.g.
  31 // the process does not have sufficient access rights to determine this.
  32 enum WOW64Status { WOW64_DISABLED, WOW64_ENABLED, WOW64_UNKNOWN, };
  33
  34 WOW64Status GetWOW64StatusForCurrentProcess() {
  35   typedef BOOL(WINAPI * IsWow64ProcessFunc)(HANDLE, PBOOL);
  36   IsWow64ProcessFunc is_wow64_process = reinterpret_cast<IsWow64ProcessFunc>(
  37       GetProcAddress(GetModuleHandle(L"kernel32.dll"), "IsWow64Process"));
  38   if (!is_wow64_process)
  39     return WOW64_DISABLED;
  40   BOOL is_wow64 = FALSE;
  41   if (!is_wow64_process(GetCurrentProcess(), &is_wow64))
  42     return WOW64_UNKNOWN;
  43   return is_wow64 ? WOW64_ENABLED : WOW64_DISABLED;
  44 }
  45
  46 class OSInfo {
  47  public:
  48   struct VersionNumber {
  49     int major;
  50     int minor;
  51     int build;
  52   };
  53
  54   struct ServicePack {
  55     int major;
  56     int minor;
  57   };
  58
  59   OSInfo() {
  60     OSVERSIONINFOEX version_info = {sizeof(version_info)};
  61     GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info));
  62     version_number_.major = version_info.dwMajorVersion;
  63     version_number_.minor = version_info.dwMinorVersion;
  64     version_number_.build = version_info.dwBuildNumber;
  65     if ((version_number_.major == 5) && (version_number_.minor > 0)) {
  66       // Treat XP Pro x64, Home Server, and Server 2003 R2 as Server 2003.
  67       version_ =
  68           (version_number_.minor == 1) ? VERSION_XP_SP2 : VERSION_SERVER_2003;
  69       if (version_ == VERSION_XP_SP2 && version_info.wServicePackMajor < 2)
  70         version_ = VERSION_PRE_XP_SP2;
  71     } else if (version_number_.major == 6) {
  72       switch (version_number_.minor) {
  73         case 0:
  74           // Treat Windows Server 2008 the same as Windows Vista.
  75           version_ = VERSION_VISTA;
  76           break;
  77         case 1:
  78           // Treat Windows Server 2008 R2 the same as Windows 7.
  79           version_ = VERSION_WIN7;
  80           break;
  81         case 2:
  82           // Treat Windows Server 2012 the same as Windows 8.
  83           version_ = VERSION_WIN8;
  84           break;
  85         default:
  86           version_ = VERSION_WIN8_1;
  87           break;
  88       }
  89     } else if (version_number_.major == 10) {
  90       version_ = VERSION_WIN10;
  91     } else if (version_number_.major > 6) {
  92       version_ = VERSION_WIN_LAST;
  93     } else {
  94       version_ = VERSION_PRE_XP_SP2;
  95     }
  96
  97     service_pack_.major = version_info.wServicePackMajor;
  98     service_pack_.minor = version_info.wServicePackMinor;
  99   }
 100
 101   Version version() const { return version_; }
 102   VersionNumber version_number() const { return version_number_; }
 103   ServicePack service_pack() const { return service_pack_; }
 104
 105  private:
 106   Version version_;
 107   VersionNumber version_number_;
 108   ServicePack service_pack_;
 109
 110   DISALLOW_COPY_AND_ASSIGN(OSInfo);
 111 };
 112
 113 }  // namespace
 114
 115 sandbox::ServiceResolverThunk* GetThunk(bool relaxed) {
 116   // Create a thunk via the appropriate ServiceResolver instance.
 117   sandbox::ServiceResolverThunk* thunk = NULL;
 118
 119   // No thunks for unsupported OS versions.
 120   OSInfo os_info;
 121   if (os_info.version() <= VERSION_PRE_XP_SP2)
 122     return thunk;
 123
 124   // Pseudo-handle, no need to close.
 125   HANDLE current_process = ::GetCurrentProcess();
 126
 127 #if defined(_WIN64)
 128   // ServiceResolverThunk can handle all the formats in 64-bit (instead only
 129   // handling one like it does in 32-bit versions).
 130   thunk = new sandbox::ServiceResolverThunk(current_process, relaxed);
 131 #else
 132   if (GetWOW64StatusForCurrentProcess() == WOW64_ENABLED) {
 133     if (os_info.version() >= VERSION_WIN8)
 134       thunk = new sandbox::Wow64W8ResolverThunk(current_process, relaxed);
 135     else
 136       thunk = new sandbox::Wow64ResolverThunk(current_process, relaxed);
 137   } else if (os_info.version() >= VERSION_WIN8) {
 138     thunk = new sandbox::Win8ResolverThunk(current_process, relaxed);
 139   } else {
 140     thunk = new sandbox::ServiceResolverThunk(current_process, relaxed);
 141   }
 142 #endif
 143
 144   return thunk;
 145 }