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