Fix 32/64-bit bitness handling in Burn and BUtil.

- Take advantage of RegOpenEx.
- Always look for related bundles in both 32 and 64 hives.
- BundleEnumRelatedBundle requires caller to specify bitness.

4 files changed, 15 insertions, 35 deletions

diff --git a/src/burn/engine/elevation.cpp b/src/burn/engine/elevation.cpp
index 355b4a34..221d8b6d 100644
--- a/src/burn/engine/elevation.cpp
+++ b/src/burn/engine/elevation.cpp
@@ -3299,7 +3299,6 @@ static HRESULT OnLaunchApprovedExe(
     SIZE_T iData = 0;
     BURN_LAUNCH_APPROVED_EXE* pLaunchApprovedExe = NULL;
     BURN_APPROVED_EXE* pApprovedExe = NULL;
-    REGSAM samDesired = KEY_QUERY_VALUE;
     HKEY hKey = NULL;
     DWORD dwProcessId = 0;
     BYTE* pbSendData = NULL;
@@ -3323,12 +3322,7 @@ static HRESULT OnLaunchApprovedExe(
 
     LogId(REPORT_STANDARD, MSG_LAUNCH_APPROVED_EXE_SEARCH, pApprovedExe->sczKey, pApprovedExe->sczValueName ? pApprovedExe->sczValueName : L"", pApprovedExe->fWin64 ? L"yes" : L"no");
 
-    if (pApprovedExe->fWin64)
-    {
-        samDesired |= KEY_WOW64_64KEY;
-    }
-
-    hr = RegOpen(HKEY_LOCAL_MACHINE, pApprovedExe->sczKey, samDesired, &hKey);
+    hr = RegOpenEx(HKEY_LOCAL_MACHINE, pApprovedExe->sczKey, KEY_QUERY_VALUE, pApprovedExe->fWin64 ? REG_KEY_64BIT : REG_KEY_32BIT, &hKey);
     ExitOnFailure(hr, "Failed to open the registry key for the approved exe path.");
 
     hr = RegReadString(hKey, pApprovedExe->sczValueName, &pLaunchApprovedExe->sczExecutablePath);
diff --git a/src/burn/engine/relatedbundle.cpp b/src/burn/engine/relatedbundle.cpp
index 99ed8553..619fa8dd 100644
--- a/src/burn/engine/relatedbundle.cpp
+++ b/src/burn/engine/relatedbundle.cpp
@@ -11,13 +11,13 @@ static __callback int __cdecl CompareRelatedBundles(
 );
 static HRESULT InitializeForScopeAndBitness(
     __in BOOL fPerMachine,
-    __in BOOL fWow6432,
+    __in REG_KEY_BITNESS regBitness,
     __in BURN_REGISTRATION* pRegistration,
     __in BURN_RELATED_BUNDLES* pRelatedBundles
     );
 static HRESULT LoadIfRelatedBundle(
     __in BOOL fPerMachine,
-    __in BOOL fWow6432,
+    __in REG_KEY_BITNESS regBitness,
     __in HKEY hkUninstallKey,
     __in_z LPCWSTR sczRelatedBundleId,
     __in BURN_REGISTRATION* pRegistration,
@@ -47,13 +47,11 @@ extern "C" HRESULT RelatedBundlesInitializeForScope(
 {
     HRESULT hr = S_OK;
 
-    hr = InitializeForScopeAndBitness(fPerMachine, /*fWow6432*/FALSE, pRegistration, pRelatedBundles);
-    ExitOnFailure(hr, "Failed to open platform-native uninstall registry key.");
-
-#if defined(_WIN64)
-    hr = InitializeForScopeAndBitness(fPerMachine, /*fWow6432*/TRUE, pRegistration, pRelatedBundles);
+    hr = InitializeForScopeAndBitness(fPerMachine, REG_KEY_32BIT, pRegistration, pRelatedBundles);
     ExitOnFailure(hr, "Failed to open 32-bit uninstall registry key.");
-#endif
+
+    hr = InitializeForScopeAndBitness(fPerMachine, REG_KEY_64BIT, pRegistration, pRelatedBundles);
+    ExitOnFailure(hr, "Failed to open 64-bit uninstall registry key.");
 
 LExit:
     return hr;
@@ -170,7 +168,7 @@ static __callback int __cdecl CompareRelatedBundles(
 
 static HRESULT InitializeForScopeAndBitness(
     __in BOOL fPerMachine,
-    __in BOOL fWow6432,
+    __in REG_KEY_BITNESS regBitness,
     __in BURN_REGISTRATION * pRegistration,
     __in BURN_RELATED_BUNDLES * pRelatedBundles
 )
@@ -180,7 +178,7 @@ static HRESULT InitializeForScopeAndBitness(
     HKEY hkUninstallKey = NULL;
     LPWSTR sczRelatedBundleId = NULL;
 
-    hr = RegOpen(hkRoot, BURN_REGISTRATION_REGISTRY_UNINSTALL_KEY, KEY_READ | (fWow6432 ? KEY_WOW64_32KEY : 0), &hkUninstallKey);
+    hr = RegOpenEx(hkRoot, BURN_REGISTRATION_REGISTRY_UNINSTALL_KEY, KEY_READ, regBitness, &hkUninstallKey);
     if (HRESULT_FROM_WIN32(ERROR_PATH_NOT_FOUND) == hr || HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND) == hr)
     {
         ExitFunction1(hr = S_OK);
@@ -202,7 +200,7 @@ static HRESULT InitializeForScopeAndBitness(
         {
             // Ignore failures here since we'll often find products that aren't actually
             // related bundles (or even bundles at all).
-            HRESULT hrRelatedBundle = LoadIfRelatedBundle(fPerMachine, fWow6432, hkUninstallKey, sczRelatedBundleId, pRegistration, pRelatedBundles);
+            HRESULT hrRelatedBundle = LoadIfRelatedBundle(fPerMachine, regBitness, hkUninstallKey, sczRelatedBundleId, pRegistration, pRelatedBundles);
             UNREFERENCED_PARAMETER(hrRelatedBundle);
         }
     }
@@ -216,7 +214,7 @@ LExit:
 
 static HRESULT LoadIfRelatedBundle(
     __in BOOL fPerMachine,
-    __in BOOL fWow6432,
+    __in REG_KEY_BITNESS regBitness,
     __in HKEY hkUninstallKey,
     __in_z LPCWSTR sczRelatedBundleId,
     __in BURN_REGISTRATION* pRegistration,
@@ -227,7 +225,7 @@ static HRESULT LoadIfRelatedBundle(
     HKEY hkBundleId = NULL;
     BOOTSTRAPPER_RELATION_TYPE relationType = BOOTSTRAPPER_RELATION_NONE;
 
-    hr = RegOpen(hkUninstallKey, sczRelatedBundleId, KEY_READ | (fWow6432 ? KEY_WOW64_32KEY : 0), &hkBundleId);
+    hr = RegOpenEx(hkUninstallKey, sczRelatedBundleId, KEY_READ, regBitness, &hkBundleId);
     ExitOnFailure(hr, "Failed to open uninstall key for potential related bundle: %ls", sczRelatedBundleId);
 
     hr = DetermineRelationType(hkBundleId, pRegistration, &relationType);
diff --git a/src/burn/engine/search.cpp b/src/burn/engine/search.cpp
index 6d5f8d49..4505e1a2 100644
--- a/src/burn/engine/search.cpp
+++ b/src/burn/engine/search.cpp
@@ -836,19 +836,13 @@ static HRESULT RegistrySearchExists(
     HKEY hKey = NULL;
     DWORD dwType = 0;
     BOOL fExists = FALSE;
-    REGSAM samDesired = KEY_QUERY_VALUE;
-
-    if (pSearch->RegistrySearch.fWin64)
-    {
-        samDesired = samDesired | KEY_WOW64_64KEY;
-    }
 
     // format key string
     hr = VariableFormatString(pVariables, pSearch->RegistrySearch.sczKey, &sczKey, NULL);
     ExitOnFailure(hr, "Failed to format key string.");
 
     // open key
-    hr = RegOpen(pSearch->RegistrySearch.hRoot, sczKey, samDesired, &hKey);
+    hr = RegOpenEx(pSearch->RegistrySearch.hRoot, sczKey, KEY_QUERY_VALUE, pSearch->RegistrySearch.fWin64 ? REG_KEY_64BIT : REG_KEY_32BIT, &hKey);
     if (SUCCEEDED(hr))
     {
         fExists = TRUE;
@@ -922,12 +916,6 @@ static HRESULT RegistrySearchValue(
     LPBYTE pData = NULL;
     DWORD cch = 0;
     BURN_VARIANT value = { };
-    REGSAM samDesired = KEY_QUERY_VALUE;
-
-    if (pSearch->RegistrySearch.fWin64)
-    {
-        samDesired = samDesired | KEY_WOW64_64KEY;
-    }
 
     // format key string
     hr = VariableFormatString(pVariables, pSearch->RegistrySearch.sczKey, &sczKey, NULL);
@@ -941,7 +929,7 @@ static HRESULT RegistrySearchValue(
     }
 
     // open key
-    hr = RegOpen(pSearch->RegistrySearch.hRoot, sczKey, samDesired, &hKey);
+    hr = RegOpenEx(pSearch->RegistrySearch.hRoot, sczKey, KEY_QUERY_VALUE, pSearch->RegistrySearch.fWin64 ? REG_KEY_64BIT : REG_KEY_32BIT, &hKey);
     if (E_FILENOTFOUND == hr)
     {
         // What if there is a hidden variable in sczKey?
diff --git a/src/burn/engine/variable.cpp b/src/burn/engine/variable.cpp
index fa6190dd..b3dcdb7d 100644
--- a/src/burn/engine/variable.cpp
+++ b/src/burn/engine/variable.cpp
@@ -2361,7 +2361,7 @@ static HRESULT Get64bitFolderFromRegistry(
     AssertSz(CSIDL_PROGRAM_FILES == nFolder || CSIDL_PROGRAM_FILES_COMMON == nFolder, "Unknown folder CSIDL.");
     LPCWSTR wzFolderValue = CSIDL_PROGRAM_FILES_COMMON == nFolder ? L"CommonFilesDir" : L"ProgramFilesDir";
 
-    hr = RegOpen(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion", KEY_READ | KEY_WOW64_64KEY, &hkFolders);
+    hr = RegOpenEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Windows\\CurrentVersion", KEY_READ, REG_KEY_64BIT, &hkFolders);
     ExitOnFailure(hr, "Failed to open Windows folder key.");
 
     hr = RegReadString(hkFolders, wzFolderValue, psczPath);