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fix import data directory bounds

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Include the null import descriptor in the import directory size and derive
the IAT directory RVA from the first import descriptor of the start of
the .idata contribution.
This commit is contained in:
Nikita Smith
2026-07-27 14:47:17 -07:00
committed by Ryan Fleury
parent 048b93b166
commit 8ec931d724
1 changed files with 2 additions and 2 deletions
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src/linker/lnk.c
+2 -2
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@@ -5564,14 +5564,14 @@ lnk_build_image(TP_Arena *arena, TP_Context *tp, LNK_Config *config, LNK_SymbolT
LNK_SectionContrib *idata_first_contrib = lnk_get_first_section_contrib(idata_sect);
PE_DataDirectory *import_dir = pe_data_directory_from_idx(image_data, pe, PE_DataDirectoryIndex_IMPORT);
import_dir->virt_off = image_section_table[idata_first_contrib->u.sect_idx + 1]->voff + idata_first_contrib->u.off;
import_dir->virt_size = null_import_desc_parsed.value - idata_first_contrib->u.off;
import_dir->virt_size = null_import_desc_parsed.value - idata_first_contrib->u.off + sizeof(PE_ImportEntry);
COFF_ParsedSymbol null_thunk_data_parsed = lnk_parsed_from_symbol(null_thunk_data);
U64 null_thunk_data_voff = image_section_table[null_thunk_data_parsed.section_number]->voff + null_thunk_data_parsed.value;
U64 first_import_foff = image_section_table[idata_first_contrib->u.sect_idx+1]->foff + idata_first_contrib->u.off;
PE_ImportEntry *first_import = str8_deserial_get_raw_ptr(image_data, first_import_foff, sizeof(*first_import));
PE_DataDirectory *import_addr_dir = pe_data_directory_from_idx(image_data, pe, PE_DataDirectoryIndex_IMPORT_ADDR);
import_addr_dir->virt_off = lnk_get_first_section_contrib_voff(image_section_table, idata_sect);
import_addr_dir->virt_off = first_import->import_addr_table_voff;
import_addr_dir->virt_size = null_thunk_data_voff - first_import->import_addr_table_voff /* null */ + coff_word_size_from_machine(config->machine);
}
}