PIE: data section + dynamic tags + PHDR layout #36
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| def link(inputs: @inputs, output: @output, debug: @debug, shared: @shared, executable: @executable, pie: @pie) | ||
| return to_elf(inputs:, output:, debug:, shared:, executable:, pie:) if @linker == "self" | ||
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| IO.popen(link_command).close |
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When linker is not "self" (the default path), the pie flag is ignored and the code just runs link_command without adding a -pie/--pie option. This means callers using Linker.link!(..., pie: true, linker: "mold") still get a non-PIE executable, which defeats the new feature outside the self-linker path. The issue is triggered whenever pie: true is combined with a non-self linker.
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| body: [ | ||
| Caotral::Binary::ELF::Section::Dynamic.new.set!(tag: tag_types[:HASH], un: 0), | ||
| Caotral::Binary::ELF::Section::Dynamic.new.set!(tag: tag_types[:RELA], un: 0), |
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The dynamic section now unconditionally adds a DT_HASH entry, but .hash is only emitted for PIE (sections << build_hash_section if @pie). For shared objects (shared: true, pie: false), DT_HASH remains zero because the writer only fills it when hash_section exists. A DT_HASH tag with a null pointer is invalid and can cause the dynamic loader to reject or mis-handle the shared object. Either add .hash for shared builds as well, or only emit DT_HASH when the section exists.
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Summary
Testing
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