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https://github.com/serge1/ELFIO.git
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Permit substitution of relocation entry by using set_entry() function call
This commit is contained in:
Serge Lamikhov-Center
parent
6037df883c
commit
6d3d5467a2
@ -200,6 +200,38 @@ class relocation_section_accessor_template
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return ret;
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}
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//------------------------------------------------------------------------------
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bool
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set_entry(Elf_Xword index,
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Elf64_Addr offset,
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Elf_Word symbol,
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Elf_Word type,
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Elf_Sxword addend)
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{
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if (index >= get_entries_num()) { // Is index valid
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return false;
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}
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if (elf_file.get_class() == ELFCLASS32) {
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if (SHT_REL == relocation_section->get_type()) {
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generic_set_entry_rel<Elf32_Rel>(index, offset, symbol, type, addend);
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}
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else if (SHT_RELA == relocation_section->get_type()) {
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generic_set_entry_rela<Elf32_Rela>(index, offset, symbol, type, addend);
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}
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}
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else {
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if (SHT_REL == relocation_section->get_type()) {
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generic_set_entry_rel<Elf64_Rel>(index, offset, symbol, type, addend);
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}
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else if (SHT_RELA == relocation_section->get_type()) {
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generic_set_entry_rela<Elf64_Rela>(index, offset, symbol, type, addend);
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}
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}
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return true;
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}
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//------------------------------------------------------------------------------
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void
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add_entry( Elf64_Addr offset, Elf_Xword info )
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@ -325,6 +357,58 @@ class relocation_section_accessor_template
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addend = convertor( pEntry->r_addend );
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}
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//------------------------------------------------------------------------------
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template <class T>
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void
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generic_set_entry_rel(Elf_Xword index,
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Elf64_Addr offset,
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Elf_Word symbol,
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Elf_Word type,
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Elf_Sxword addend)
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{
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const endianess_convertor &convertor = elf_file.get_convertor();
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T *pEntry = const_cast<T *>(reinterpret_cast<const T *>(relocation_section->get_data() +
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index * relocation_section->get_entry_size()));
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if (elf_file.get_class() == ELFCLASS32) {
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pEntry->r_info = ELF32_R_INFO((Elf_Xword)symbol, type);
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}
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else {
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pEntry->r_info = ELF64_R_INFO((Elf_Xword)symbol, type);
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}
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pEntry->r_offset = offset;
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pEntry->r_offset = convertor(pEntry->r_offset);
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pEntry->r_info = convertor(pEntry->r_info);
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}
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//------------------------------------------------------------------------------
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template <class T>
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void
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generic_set_entry_rela(Elf_Xword index,
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Elf64_Addr offset,
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Elf_Word symbol,
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Elf_Word type,
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Elf_Sxword addend)
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{
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const endianess_convertor &convertor = elf_file.get_convertor();
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T *pEntry = const_cast<T *>(reinterpret_cast<const T *>(relocation_section->get_data() +
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index * relocation_section->get_entry_size()));
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if (elf_file.get_class() == ELFCLASS32) {
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pEntry->r_info = ELF32_R_INFO((Elf_Xword)symbol, type);
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}
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else {
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pEntry->r_info = ELF64_R_INFO((Elf_Xword)symbol, type);
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}
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pEntry->r_offset = offset;
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pEntry->r_addend = addend;
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pEntry->r_offset = convertor(pEntry->r_offset);
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pEntry->r_info = convertor(pEntry->r_info);
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pEntry->r_addend = convertor(pEntry->r_addend);
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}
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//------------------------------------------------------------------------------
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template< class T >
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void
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@ -650,7 +650,7 @@ BOOST_AUTO_TEST_CASE(rearrange_local_symbols)
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value = 8;
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symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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symbols.arrange_local_symbols([symbols](Elf_Xword first, Elf_Xword second) -> void {
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symbols.arrange_local_symbols([&](Elf_Xword first, Elf_Xword second) -> void {
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static int counter = 0;
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BOOST_CHECK_EQUAL(first, ++counter);
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// std::string name = "";
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@ -702,3 +702,161 @@ BOOST_AUTO_TEST_CASE(rearrange_local_symbols)
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}
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BOOST_CHECK_EQUAL(name, "Str8");
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}
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////////////////////////////////////////////////////////////////////////////////
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BOOST_AUTO_TEST_CASE(rearrange_local_symbols_with_reallocation)
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{
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std::string name = "";
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ELFIO::Elf64_Addr value = 0;
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ELFIO::Elf_Xword size = 0;
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unsigned char bind = STB_LOCAL;
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unsigned char type = STT_FUNC;
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ELFIO::Elf_Half section_index = 0;
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unsigned char other = 0;
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const std::string file_name = "elf_examples/test_symbols_order.elf";
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elfio writer;
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writer.create(ELFCLASS64, ELFDATA2LSB);
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writer.set_os_abi(ELFOSABI_LINUX);
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writer.set_type(ET_EXEC);
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writer.set_machine(EM_X86_64);
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section *text_sec = writer.sections.add(".text");
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text_sec->set_type(SHT_PROGBITS);
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text_sec->set_flags(SHF_ALLOC | SHF_EXECINSTR);
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text_sec->set_addr_align(0x10);
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section* str_sec = writer.sections.add(".strtab");
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str_sec->set_type(SHT_STRTAB);
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str_sec->set_addr_align(0x1);
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string_section_accessor str_writer(str_sec);
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section* sym_sec = writer.sections.add(".symtab");
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sym_sec->set_type(SHT_SYMTAB);
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sym_sec->set_info(0);
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sym_sec->set_link(str_sec->get_index());
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sym_sec->set_addr_align(4);
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sym_sec->set_entry_size(writer.get_default_entry_size(SHT_SYMTAB));
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symbol_section_accessor symbols(writer, sym_sec);
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name = "Str1";
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bind = STB_GLOBAL;
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value = 1;
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Elf_Word sym1 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str2";
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bind = STB_LOCAL;
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value = 2;
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Elf_Word sym2 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str3";
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bind = STB_WEAK;
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value = 3;
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Elf_Word sym3 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str4";
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bind = STB_LOCAL;
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value = 4;
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Elf_Word sym4 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str5";
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bind = STB_LOCAL;
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value = 5;
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Elf_Word sym5 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str6";
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bind = STB_GLOBAL;
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value = 6;
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Elf_Word sym6 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str7";
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bind = STB_LOCAL;
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value = 7;
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Elf_Word sym7 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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name = "Str8";
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bind = STB_WEAK;
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value = 8;
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Elf_Word sym8 = symbols.add_symbol(str_writer, name.c_str(), value, size, bind, type, other, section_index);
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section* rel_sec = writer.sections.add(".rel.text");
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rel_sec->set_type(SHT_REL);
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rel_sec->set_info(text_sec->get_index());
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rel_sec->set_addr_align(0x4);
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rel_sec->set_entry_size(writer.get_default_entry_size(SHT_REL));
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rel_sec->set_link(sym_sec->get_index());
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relocation_section_accessor rela(writer, rel_sec);
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// Add relocation entry (adjust address at offset 11)
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rela.add_entry(1, sym1, (unsigned char)R_386_RELATIVE);
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rela.add_entry(8, sym8, (unsigned char)R_386_RELATIVE);
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rela.add_entry(6, sym6, (unsigned char)R_386_RELATIVE);
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rela.add_entry(2, sym2, (unsigned char)R_386_RELATIVE);
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rela.add_entry(3, sym3, (unsigned char)R_386_RELATIVE);
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rela.add_entry(8, sym8, (unsigned char)R_386_RELATIVE);
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rela.add_entry(7, sym7, (unsigned char)R_386_RELATIVE);
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rela.add_entry(2, sym2, (unsigned char)R_386_RELATIVE);
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rela.add_entry(11, sym1, (unsigned char)R_386_RELATIVE);
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rela.add_entry(18, sym8, (unsigned char)R_386_RELATIVE);
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rela.add_entry(16, sym6, (unsigned char)R_386_RELATIVE);
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rela.add_entry(12, sym2, (unsigned char)R_386_RELATIVE);
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rela.add_entry(13, sym3, (unsigned char)R_386_RELATIVE);
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rela.add_entry(17, sym7, (unsigned char)R_386_RELATIVE);
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rela.add_entry(14, sym4, (unsigned char)R_386_RELATIVE);
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rela.add_entry(15, sym5, (unsigned char)R_386_RELATIVE);
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std::vector<std::string> before;
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for (Elf_Word i = 0; i < rela.get_entries_num(); i++)
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{
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Elf64_Addr offset;
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Elf_Word symbol;
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Elf_Word rtype;
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Elf_Sxword addend;
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rela.get_entry(i, offset, symbol, rtype, addend);
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symbols.get_symbol(symbol, name, value, size, bind, type, section_index, other);
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before.push_back(name);
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}
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symbols.arrange_local_symbols([&](Elf_Xword first, Elf_Xword second) -> void {
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Elf64_Addr offset;
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Elf_Word symbol;
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Elf_Word rtype;
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Elf_Sxword addend;
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for (Elf_Word i = 0; i < rela.get_entries_num(); i++) {
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rela.get_entry(i, offset, symbol, rtype, addend);
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if (symbol == first) {
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rela.set_entry(i, offset, second, rtype, addend);
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}
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if (symbol == second) {
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rela.set_entry(i, offset, first, rtype, addend);
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}
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}
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});
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BOOST_REQUIRE_EQUAL(writer.save(file_name), true);
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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elfio reader;
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BOOST_REQUIRE_EQUAL(reader.load(file_name), true);
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auto prelsec = reader.sections[".rel.text"];
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auto psyms = reader.sections[".symtab"];
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BOOST_REQUIRE_NE(prelsec, nullptr);
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BOOST_REQUIRE_NE(psyms, nullptr);
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const_relocation_section_accessor rel(reader, prelsec);
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const_symbol_section_accessor syms(reader, psyms);
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std::vector<std::string> after;
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for (Elf_Word i = 0; i < rel.get_entries_num(); i++)
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{
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Elf64_Addr offset;
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Elf_Word symbol;
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Elf_Word rtype;
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Elf_Sxword addend;
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rel.get_entry(i, offset, symbol, rtype, addend);
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syms.get_symbol(symbol, name, value, size, bind, type, section_index, other);
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after.push_back(name);
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}
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BOOST_CHECK_EQUAL_COLLECTIONS(before.begin(), before.end(), after.begin(), after.end());
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}
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