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bpo-39401: Avoid unsafe DLL load on Windows 7 and earlier (GH-18231)
As Windows 7 is not supported by Python 3.9, we just replace the dynamic load with a static import. Backports will have a different fix to ensure they continue to behave the same.
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commit
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Avoid unsafe DLL load at startup on Windows 7 and earlier.
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@ -91,6 +91,7 @@
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#endif
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#include <windows.h>
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#include <pathcch.h>
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#include <shlwapi.h>
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#ifdef HAVE_SYS_TYPES_H
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@ -242,42 +243,14 @@ ismodule(wchar_t *filename, int update_filename)
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stuff as fits will be appended.
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*/
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static int _PathCchCombineEx_Initialized = 0;
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typedef HRESULT(__stdcall *PPathCchCombineEx) (PWSTR pszPathOut, size_t cchPathOut,
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PCWSTR pszPathIn, PCWSTR pszMore,
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unsigned long dwFlags);
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static PPathCchCombineEx _PathCchCombineEx;
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static void
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join(wchar_t *buffer, const wchar_t *stuff)
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{
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if (_PathCchCombineEx_Initialized == 0) {
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HMODULE pathapi = LoadLibraryW(L"api-ms-win-core-path-l1-1-0.dll");
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if (pathapi) {
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_PathCchCombineEx = (PPathCchCombineEx)GetProcAddress(pathapi, "PathCchCombineEx");
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}
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else {
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_PathCchCombineEx = NULL;
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}
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_PathCchCombineEx_Initialized = 1;
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}
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if (_PathCchCombineEx) {
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if (FAILED(_PathCchCombineEx(buffer, MAXPATHLEN+1, buffer, stuff, 0))) {
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Py_FatalError("buffer overflow in getpathp.c's join()");
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}
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} else {
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if (!PathCombineW(buffer, buffer, stuff)) {
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Py_FatalError("buffer overflow in getpathp.c's join()");
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}
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if (FAILED(PathCchCombineEx(buffer, MAXPATHLEN+1, buffer, stuff, 0))) {
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Py_FatalError("buffer overflow in getpathp.c's join()");
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}
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}
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static int _PathCchCanonicalizeEx_Initialized = 0;
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typedef HRESULT(__stdcall *PPathCchCanonicalizeEx) (PWSTR pszPathOut, size_t cchPathOut,
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PCWSTR pszPathIn, unsigned long dwFlags);
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static PPathCchCanonicalizeEx _PathCchCanonicalizeEx;
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/* Call PathCchCanonicalizeEx(path): remove navigation elements such as "."
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and ".." to produce a direct, well-formed path. */
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static PyStatus
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@ -287,26 +260,8 @@ canonicalize(wchar_t *buffer, const wchar_t *path)
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return _PyStatus_NO_MEMORY();
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}
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if (_PathCchCanonicalizeEx_Initialized == 0) {
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HMODULE pathapi = LoadLibraryW(L"api-ms-win-core-path-l1-1-0.dll");
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if (pathapi) {
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_PathCchCanonicalizeEx = (PPathCchCanonicalizeEx)GetProcAddress(pathapi, "PathCchCanonicalizeEx");
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}
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else {
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_PathCchCanonicalizeEx = NULL;
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}
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_PathCchCanonicalizeEx_Initialized = 1;
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}
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if (_PathCchCanonicalizeEx) {
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if (FAILED(_PathCchCanonicalizeEx(buffer, MAXPATHLEN + 1, path, 0))) {
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return INIT_ERR_BUFFER_OVERFLOW();
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}
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}
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else {
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if (!PathCanonicalizeW(buffer, path)) {
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return INIT_ERR_BUFFER_OVERFLOW();
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}
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if (FAILED(PathCchCanonicalizeEx(buffer, MAXPATHLEN + 1, path, 0))) {
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return INIT_ERR_BUFFER_OVERFLOW();
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}
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return _PyStatus_OK();
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}
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@ -106,7 +106,7 @@
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<PreprocessorDefinitions Condition="$(IncludeExternals)">_Py_HAVE_ZLIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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</ClCompile>
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<Link>
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<AdditionalDependencies>version.lib;shlwapi.lib;ws2_32.lib;%(AdditionalDependencies)</AdditionalDependencies>
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<AdditionalDependencies>version.lib;shlwapi.lib;ws2_32.lib;pathcch.lib;%(AdditionalDependencies)</AdditionalDependencies>
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</Link>
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</ItemDefinitionGroup>
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<ItemGroup>
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