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Fix bug in libpe ordinal mask handling #213

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merged 3 commits into from
Apr 27, 2024
+33 −29
Merged

Fix bug in libpe ordinal mask handling #213

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6a01bff
Fix ordinal mask bug in imports.c
redspot Apr 24, 2024
d805077
Refactor ordinal mask handling
redspot Apr 24, 2024
c4fda31
add manual workflow trigger
redspot Apr 24, 2024
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14 changes: 7 additions & 7 deletions lib/libpe/imports.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
libpe - the PE library

Copyright (C) 2010 - 2017 libpe authors

This file is part of libpe.

libpe is free software: you can redistribute it and/or modify
Expand Down Expand Up @@ -54,7 +54,7 @@ static uint32_t get_dll_count(pe_ctx_t *ctx) {
break;

ofs += sizeof(IMAGE_IMPORT_DESCRIPTOR);

const uint64_t aux = ofs; // Store current ofs
ofs = pe_rva2ofs(ctx, id->Name);
if (ofs == 0)
Expand All @@ -70,7 +70,7 @@ static uint32_t get_dll_count(pe_ctx_t *ctx) {
ofs = aux; // Restore previous ofs
}

return count;
return count;
}

static uint32_t get_functions_count(pe_ctx_t *ctx, uint64_t offset) {
Expand Down Expand Up @@ -112,8 +112,8 @@ static uint32_t get_functions_count(pe_ctx_t *ctx, uint64_t offset) {
if (thunk_type == 0)
return count;

bool is_ordinal = (thunk_type & IMAGE_ORDINAL_FLAG32) != 0;
bool is_ordinal = (thunk_type & IMAGE_ORDINAL_FLAG64) != 0;

if (!is_ordinal) {
uint64_t imp_ofs = pe_rva2ofs(ctx, thunk->u1.AddressOfData);
const IMAGE_IMPORT_BY_NAME *imp_name = LIBPE_PTR_ADD(ctx->map_addr, imp_ofs);
Expand Down Expand Up @@ -261,7 +261,7 @@ pe_imports_t *pe_imports(pe_ctx_t *ctx) {
}

imports->err = LIBPE_E_OK;

imports->dll_count = get_dll_count(ctx);
if (imports->dll_count == 0)
return imports;
Expand Down Expand Up @@ -330,7 +330,7 @@ pe_imports_t *pe_imports(pe_ctx_t *ctx) {
if (ofs == 0) {
break;
}

pe_err_e parse_err = parse_imported_functions(ctx, dll, ofs);
if (parse_err != LIBPE_E_OK) {
imports->err = parse_err;
Expand Down