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[release/6.0-staging][native-library] If a dllimport is specified with an absolute path, look for it first #85271

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Apr 26, 2023
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[release/6.0-staging][native-library] If a dllimport is specified with an absolute path, look for it first #85271

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15 changes: 10 additions & 5 deletions src/mono/mono/metadata/native-library.c
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Original file line number Diff line number Diff line change
Expand Up @@ -518,11 +518,18 @@ netcore_probe_for_module (MonoImage *image, const char *file_name, int flags)
// TODO: this algorithm doesn't quite match CoreCLR, so respecting DLLIMPORTSEARCHPATH_LEGACY_BEHAVIOR makes little sense
// If the difference becomes a problem, overhaul this algorithm to match theirs exactly

gboolean probe_first_without_prepend = FALSE;

#if defined(HOST_ANDROID)
// On Android, try without any path additions first. It is sensitive to probing that will always miss
// and lookup for some libraries is required to use a relative path
module = netcore_probe_for_module_variations (NULL, file_name, lflags);
probe_first_without_prepend = TRUE;
#else
if (file_name != NULL && g_path_is_absolute (file_name))
probe_first_without_prepend = TRUE;
#endif
if (module == NULL && probe_first_without_prepend)
module = netcore_probe_for_module_variations (NULL, file_name, lflags);

// Check the NATIVE_DLL_SEARCH_DIRECTORIES
for (int i = 0; i < pinvoke_search_directories_count && module == NULL; ++i)
Expand All @@ -537,13 +544,11 @@ netcore_probe_for_module (MonoImage *image, const char *file_name, int flags)
g_free (mdirname);
}

#if !defined(HOST_ANDROID)
// Try without any path additions
if (module == NULL)
// Try without any path additions, if we didn't try it already
if (module == NULL && !probe_first_without_prepend)
{
module = netcore_probe_for_module_variations (NULL, file_name, lflags);
}
#endif

// TODO: Pass remaining flags on to LoadLibraryEx on Windows where appropriate, see https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.dllimportsearchpath?view=netcore-3.1

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