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[3.6] bpo-39401: Avoid unsafe DLL load on Windows 7 and earlier (GH-18231) #18233

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Merged
merged 3 commits into from
Jan 31, 2020
Merged

[3.6] bpo-39401: Avoid unsafe DLL load on Windows 7 and earlier (GH-18231) #18233

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eafce17
bpo-39401: Avoid unsafe DLL load on Windows 7 and earlier
zooba Jan 28, 2020
01942ca
Remove extra brace
zooba Jan 28, 2020
9e3d92d
Update 2020-01-28-20-54-09.bpo-39401.he7h_A.rst
zooba Jan 30, 2020
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Security/2020-01-28-20-54-09.bpo-39401.he7h_A.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Avoid unsafe load of ``api-ms-win-core-path-l1-1-0.dll`` at startup on Windows 7.
6 changes: 4 additions & 2 deletions PC/getpathp.c
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Expand Up @@ -224,7 +224,8 @@ static void
join(wchar_t *buffer, const wchar_t *stuff)
{
if (_PathCchCombineEx_Initialized == 0) {
HMODULE pathapi = LoadLibraryW(L"api-ms-win-core-path-l1-1-0.dll");
HMODULE pathapi = LoadLibraryExW(L"api-ms-win-core-path-l1-1-0.dll", NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32);
if (pathapi)
_PathCchCombineEx = (PPathCchCombineEx)GetProcAddress(pathapi, "PathCchCombineEx");
else
Expand All @@ -249,7 +250,8 @@ static PPathCchCanonicalizeEx _PathCchCanonicalizeEx;
static void canonicalize(wchar_t *buffer, const wchar_t *path)
{
if (_PathCchCanonicalizeEx_Initialized == 0) {
HMODULE pathapi = LoadLibraryW(L"api-ms-win-core-path-l1-1-0.dll");
HMODULE pathapi = LoadLibraryExW(L"api-ms-win-core-path-l1-1-0.dll", NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32);
if (pathapi) {
_PathCchCanonicalizeEx = (PPathCchCanonicalizeEx)GetProcAddress(pathapi, "PathCchCanonicalizeEx");
}
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12 changes: 10 additions & 2 deletions Tools/msi/bundle/bootstrap/PythonBootstrapperApplication.cpp
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Expand Up @@ -3042,8 +3042,16 @@ class PythonBootstrapperApplication : public CBalBaseBootstrapperApplication {
}
} else {
if (IsWindows7SP1OrGreater()) {
BalLog(BOOTSTRAPPER_LOG_LEVEL_STANDARD, "Target OS is Windows 7 SP1 or later");
return;
HMODULE hKernel32 = GetModuleHandleW(L"kernel32");
if (hKernel32 && !GetProcAddress(hKernel32, "AddDllDirectory")) {
BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "Detected Windows 7 SP1 without KB2533623");
BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "KB2533623 update is required to continue.");
/* The "MissingSP1" error also specifies updates are required */
LocGetString(_wixLoc, L"#(loc.FailureWin7MissingSP1)", &pLocString);
} else {
BalLog(BOOTSTRAPPER_LOG_LEVEL_STANDARD, "Target OS is Windows 7 SP1 or later");
return;
}
} else if (IsWindows7OrGreater()) {
BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "Detected Windows 7 RTM");
BalLog(BOOTSTRAPPER_LOG_LEVEL_ERROR, "Service Pack 1 is required to continue installation");
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