[release/10.0] Pass correct search path to DllImportResolver for default flags on Mono#129862
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[release/10.0] Pass correct search path to DllImportResolver for default flags on Mono#129862github-actions[bot] wants to merge 1 commit into
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When neither the P/Invoke nor the assembly has a DefaultDllImportSearchPaths attribute, Mono passed DllImportSearchPath.AssemblyDirectory to a registered DllImportResolver instead of null. lookup_pinvoke_call_impl defaults the flags to ASSEMBLY_DIRECTORY for the built-in probing logic, and netcore_resolve_with_dll_import_resolver derived "has search flags" from (flags != 0), so the defaulted value leaked to the resolver. Combined with #114756 - which made an explicit AssemblyDirectory no longer fall back to the OS search - this broke resolvers that forward the search path to NativeLibrary.Load, such as loading iOS @rpath frameworks. Thread the existing user_specified_flags signal through to the resolver so it receives the attribute value, or null when none was specified, matching CoreCLR and NativeAOT. Fixes #129798 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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This was referenced Jun 25, 2026
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Backport of #129831 to release/10.0
/cc @elinor-fung
Customer Impact
Customer reported in #129798.
On Mono, when no search flags are user-specified, the runtime ends up passing an explicit
DllImportSeachPath.AssemblyDirectoryvalue was passed to any registeredDllImportResolverinstead of null. The expected DllImportResolver contract is that search path is the attribute value, or null when neither the P/Invoke nor the assembly has the attribute.Before #114756, specifying only
DllImportSearchPath.AssemblyDirectorywould still do the default search, so the Mono behaviour of explicitly passingAssemblyDirectoryinstead of null didn't really matter. After that change, specifying onlyDllImportSeachPath.AssemblyDirectorymeant only assembly directory. This means that when a resolver that forwards the (wrongly non-null) AssemblyDirectory to NativeLibrary.Load, it no longer does the default search.This change propagates the tracking of whether flags were user-specified to the resolver invocation, so the resolver is given the attribute value or null for non-user-specified.
Fixes #129798
Regression
#114756
Testing
Automated tests added.
Risk
Low. Mono-only, propagating a boolean value correctly.