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6bc01909b7
ladybird/Userland/Utilities/readelf.cpp
Brendan Coles 6bc01909b7 readelf: Add support for core notes and relocations
2021-03-14 13:55:07 +01:00

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/*
* Copyright (c) 2020, the SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/MappedFile.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <LibCore/ArgsParser.h>
#include <LibELF/Image.h>
#include <LibELF/Validation.h>
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
static const char* object_file_type_to_string(Elf32_Half type)
{
switch (type) {
case ET_NONE:
return "None";
case ET_REL:
return "Relocatable";
case ET_EXEC:
return "Executable";
case ET_DYN:
return "Shared object";
case ET_CORE:
return "Core";
default:
return "(?)";
}
}
static const char* object_machine_type_to_string(Elf32_Half type)
{
switch (type) {
case ET_NONE:
return "None";
case EM_M32:
return "AT&T WE 32100";
case EM_SPARC:
return "SPARC";
case EM_386:
return "Intel 80386";
case EM_68K:
return "Motorola 68000";
case EM_88K:
return "Motorola 88000";
case EM_486:
return "Intel 80486";
case EM_860:
return "Intel 80860";
case EM_MIPS:
return "MIPS R3000 Big-Endian only";
default:
return "(?)";
}
}
static const char* object_program_header_type_to_string(Elf32_Word type)
{
switch (type) {
case PT_NULL:
return "NULL";
case PT_LOAD:
return "LOAD";
case PT_DYNAMIC:
return "DYNAMIC";
case PT_INTERP:
return "INTERP";
case PT_NOTE:
return "NOTE";
case PT_SHLIB:
return "SHLIB";
case PT_PHDR:
return "PHDR";
case PT_TLS:
return "TLS";
case PT_LOOS:
return "LOOS";
case PT_HIOS:
return "HIOS";
case PT_LOPROC:
return "LOPROC";
case PT_HIPROC:
return "HIPROC";
case PT_GNU_EH_FRAME:
return "GNU_EH_FRAME";
case PT_GNU_RELRO:
return "GNU_RELRO";
case PT_GNU_STACK:
return "GNU_STACK";
case PT_OPENBSD_RANDOMIZE:
return "OPENBSD_RANDOMIZE";
case PT_OPENBSD_WXNEEDED:
return "OPENBSD_WXNEEDED";
case PT_OPENBSD_BOOTDATA:
return "OPENBSD_BOOTDATA";
default:
return "(?)";
}
}
static const char* object_section_header_type_to_string(Elf32_Word type)
{
switch (type) {
case SHT_NULL:
return "NULL";
case SHT_PROGBITS:
return "PROGBITS";
case SHT_SYMTAB:
return "SYMTAB";
case SHT_STRTAB:
return "STRTAB";
case SHT_RELA:
return "RELA";
case SHT_HASH:
return "HASH";
case SHT_DYNAMIC:
return "DYNAMIC";
case SHT_NOTE:
return "NOTE";
case SHT_NOBITS:
return "NOBITS";
case SHT_REL:
return "REL";
case SHT_SHLIB:
return "SHLIB";
case SHT_DYNSYM:
return "DYNSYM";
case SHT_NUM:
return "NUM";
case SHT_INIT_ARRAY:
return "INIT_ARRAY";
case SHT_FINI_ARRAY:
return "FINI_ARRAY";
case SHT_PREINIT_ARRAY:
return "PREINIT_ARRAY";
case SHT_GROUP:
return "GROUP";
case SHT_SYMTAB_SHNDX:
return "SYMTAB_SHNDX";
case SHT_LOOS:
return "SOOS";
case SHT_SUNW_dof:
return "SUNW_dof";
case SHT_GNU_LIBLIST:
return "GNU_LIBLIST";
case SHT_SUNW_move:
return "SUNW_move";
case SHT_SUNW_syminfo:
return "SUNW_syminfo";
case SHT_SUNW_verdef:
return "SUNW_verdef";
case SHT_SUNW_verneed:
return "SUNW_verneed";
case SHT_SUNW_versym: // or SHT_HIOS
return "SUNW_versym";
case SHT_LOPROC:
return "LOPROC";
case SHT_HIPROC:
return "HIPROC";
case SHT_LOUSER:
return "LOUSER";
case SHT_HIUSER:
return "HIUSER";
case SHT_GNU_HASH:
return "GNU_HASH";
default:
return "(?)";
}
}
static const char* object_symbol_type_to_string(Elf32_Word type)
{
switch (type) {
case STT_NOTYPE:
return "NOTYPE";
case STT_OBJECT:
return "OBJECT";
case STT_FUNC:
return "FUNC";
case STT_SECTION:
return "SECTION";
case STT_FILE:
return "FILE";
case STT_TLS:
return "TLS";
case STT_LOPROC:
return "LOPROC";
case STT_HIPROC:
return "HIPROC";
default:
return "(?)";
}
}
static const char* object_symbol_binding_to_string(Elf32_Word type)
{
switch (type) {
case STB_LOCAL:
return "LOCAL";
case STB_GLOBAL:
return "GLOBAL";
case STB_WEAK:
return "WEAK";
case STB_NUM:
return "NUM";
case STB_LOPROC:
return "LOPROC";
case STB_HIPROC:
return "HIPROC";
default:
return "(?)";
}
}
static const char* object_relocation_type_to_string(Elf32_Word type)
{
switch (type) {
case R_386_NONE:
return "R_386_NONE";
case R_386_32:
return "R_386_32";
case R_386_PC32:
return "R_386_PC32";
case R_386_GOT32:
return "R_386_GOT32";
case R_386_PLT32:
return "R_386_PLT32";
case R_386_COPY:
return "R_386_COPY";
case R_386_GLOB_DAT:
return "R_386_GLOB_DAT";
case R_386_JMP_SLOT:
return "R_386_JMP_SLOT";
case R_386_RELATIVE:
return "R_386_RELATIVE";
case R_386_TLS_TPOFF:
return "R_386_TLS_TPOFF";
case R_386_TLS_TPOFF32:
return "R_386_TLS_TPOFF32";
default:
return "(?)";
}
}
int main(int argc, char** argv)
{
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
const char* path;
static bool display_all = false;
static bool display_elf_header = false;
static bool display_program_headers = false;
static bool display_section_headers = false;
static bool display_headers = false;
static bool display_symbol_table = false;
static bool display_dynamic_symbol_table = false;
static bool display_core_notes = false;
static bool display_relocations = false;
static bool display_unwind_info = false;
static bool display_dynamic_section = false;
Core::ArgsParser args_parser;
args_parser.add_option(display_all, "Display all", "all", 'a');
args_parser.add_option(display_elf_header, "Display ELF header", "file-header", 'h');
args_parser.add_option(display_program_headers, "Display program headers", "program-headers", 'l');
args_parser.add_option(display_section_headers, "Display section headers", "section-headers", 'S');
args_parser.add_option(display_headers, "Equivalent to: -h -l -S -s -r -d -n -u", "headers", 'e');
args_parser.add_option(display_symbol_table, "Display the symbol table", "syms", 's');
args_parser.add_option(display_dynamic_section, "Display the dynamic section", "dynamic", 'd');
args_parser.add_option(display_core_notes, "Display core notes", "notes", 'n');
args_parser.add_option(display_relocations, "Display relocations", "relocs", 'r');
args_parser.add_option(display_unwind_info, "Display unwind info", "unwind", 'u');
args_parser.add_positional_argument(path, "ELF path", "path");
args_parser.parse(argc, argv);
if (argc < 3) {
args_parser.print_usage(stderr, argv[0]);
return -1;
}
if (display_headers) {
display_elf_header = true;
display_program_headers = true;
display_section_headers = true;
}
if (display_all) {
display_elf_header = true;
display_program_headers = true;
display_section_headers = true;
display_core_notes = true;
display_relocations = true;
display_unwind_info = true;
display_symbol_table = true;
}
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error()) {
warnln("Unable to map file {}: {}", path, file_or_error.error());
return -1;
}
auto elf_image_data = file_or_error.value()->bytes();
ELF::Image executable_elf(elf_image_data);
if (!executable_elf.is_valid()) {
fprintf(stderr, "File is not a valid ELF object\n");
return -1;
}
String interpreter_path;
if (!ELF::validate_program_headers(*(const Elf32_Ehdr*)elf_image_data.data(), elf_image_data.size(), (const u8*)elf_image_data.data(), elf_image_data.size(), &interpreter_path)) {
fprintf(stderr, "Invalid ELF headers\n");
return -1;
}
if (executable_elf.is_dynamic() && interpreter_path.is_null()) {
fprintf(stderr, "Warning: Dynamic ELF object has no interpreter path\n");
}
ELF::Image interpreter_image(elf_image_data);
if (!interpreter_image.is_valid()) {
fprintf(stderr, "ELF image is invalid\n");
return -1;
}
auto& header = *reinterpret_cast<const Elf32_Ehdr*>(elf_image_data.data());
if (display_elf_header) {
printf("ELF header:\n");
String magic = String::format("%s", header.e_ident);
printf(" Magic: ");
for (size_t i = 0; i < magic.length(); i++) {
if (isprint(magic[i])) {
printf("%c ", magic[i]);
} else {
printf("%02x ", magic[i]);
}
}
printf("\n");
printf(" Type: %d (%s)\n", header.e_type, object_file_type_to_string(header.e_type));
printf(" Machine: %u (%s)\n", header.e_machine, object_machine_type_to_string(header.e_machine));
printf(" Version: 0x%x\n", header.e_version);
printf(" Entry point address: 0x%x\n", header.e_entry);
printf(" Start of program headers: %u (bytes into file)\n", header.e_phoff);
printf(" Start of section headers: %u (bytes into file)\n", header.e_shoff);
printf(" Flags: 0x%x\n", header.e_flags);
printf(" Size of this header: %u (bytes)\n", header.e_ehsize);
printf(" Size of program headers: %u (bytes)\n", header.e_phentsize);
printf(" Number of program headers: %u\n", header.e_phnum);
printf(" Size of section headers: %u (bytes)\n", header.e_shentsize);
printf(" Number of section headers: %u\n", header.e_shnum);
printf(" Section header string table index: %u\n", header.e_shstrndx);
printf("\n");
}
if (display_section_headers) {
if (!display_all) {
printf("There are %u section headers, starting at offset 0x%x:\n", header.e_shnum, header.e_shoff);
printf("\n");
}
if (!interpreter_image.section_count()) {
printf("There are no sections in this file.\n");
} else {
printf("Section Headers:\n");
printf(" Name Type Address Offset Size Flags\n");
interpreter_image.for_each_section([](const ELF::Image::Section& section) {
printf(" %-15s ", StringView(section.name()).to_string().characters());
printf("%-15s ", object_section_header_type_to_string(section.type()));
printf("%08x ", section.address());
printf("%08x ", section.offset());
printf("%08x ", section.size());
printf("%u", section.flags());
printf("\n");
return IterationDecision::Continue;
});
}
printf("\n");
}
if (display_program_headers) {
if (!display_all) {
printf("Elf file type is %d (%s)\n", header.e_type, object_file_type_to_string(header.e_type));
printf("Entry point 0x%x\n", header.e_entry);
printf("There are %u program headers, starting at offset %u\n", header.e_phnum, header.e_phoff);
printf("\n");
}
printf("Program Headers:\n");
printf(" Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align\n");
interpreter_image.for_each_program_header([](const ELF::Image::ProgramHeader& program_header) {
printf(" %-14s ", object_program_header_type_to_string(program_header.type()));
printf("0x%08x ", program_header.offset());
printf("%p ", program_header.vaddr().as_ptr());
printf("%p ", program_header.vaddr().as_ptr()); // FIXME: assumes PhysAddr = VirtAddr
printf("0x%08x ", program_header.size_in_image());
printf("0x%08x ", program_header.size_in_memory());
printf("%04x ", program_header.flags());
printf("0x%08x", program_header.alignment());
printf("\n");
if (program_header.type() == PT_INTERP)
printf(" [Interpreter: %s]\n", program_header.raw_data());
return IterationDecision::Continue;
});
// TODO: Display section to segment mapping
printf("\n");
}
if (display_dynamic_section) {
auto found_dynamic_section = false;
interpreter_image.for_each_section([&found_dynamic_section](const ELF::Image::Section& section) {
if (section.name() != ELF_DYNAMIC)
return IterationDecision::Continue;
found_dynamic_section = true;
if (!section.entry_count()) {
printf("Dynamic section '%s' at offset 0x%08x contains zero entries.\n", section.name().to_string().characters(), section.offset());
return IterationDecision::Continue;
}
printf("Dynamic section '%s' at offset 0x%08x contains %u entries.\n", section.name().to_string().characters(), section.offset(), section.entry_count());
// TODO: Display dynamic section
return IterationDecision::Continue;
});
if (!found_dynamic_section)
printf("No dynamic section in this file.\n");
printf("\n");
}
if (display_relocations) {
auto found_relocations = false;
interpreter_image.for_each_section([&found_relocations](const ELF::Image::Section& section) {
// FIXME: support dynamic relocations (.rel.dyn)
if (!section.relocations().relocation_count())
return IterationDecision::Continue;
found_relocations = true;
if (!section.relocations().entry_count()) {
printf("Relocation section '%s' at offset 0x%08x contains zero entries.\n", section.name().to_string().characters(), section.offset());
return IterationDecision::Continue;
}
printf("Relocation section '%s' at offset 0x%08x contains %u entries:\n", section.relocations().name().to_string().characters(), section.relocations().offset(), section.relocations().entry_count());
printf(" Offset Type Sym Value Sym Name\n");
section.relocations().for_each_relocation([](const ELF::Image::Relocation& reloc) {
printf(" 0x%08x ", reloc.offset());
printf(" %-17s ", object_relocation_type_to_string(reloc.type()));
printf(" 0x%08x ", reloc.symbol().value());
printf(" %s", reloc.symbol().name().to_string().characters());
printf("\n");
return IterationDecision::Continue;
});
printf("\n");
return IterationDecision::Continue;
});
if (!found_relocations)
printf("No relocations in this file.\n");
printf("\n");
}
if (display_unwind_info) {
// TODO: Unwind info
printf("Decoding of unwind sections for machine type %s is not supported.\n", object_machine_type_to_string(header.e_machine));
printf("\n");
}
if (display_core_notes) {
auto found_notes = false;
interpreter_image.for_each_program_header([&found_notes](const ELF::Image::ProgramHeader& program_header) {
if (program_header.type() != PT_NOTE)
return IterationDecision::Continue;
found_notes = true;
printf("Displaying notes section '%s' at offset 0x%08x of length 0x%08x:\n", object_program_header_type_to_string(program_header.type()), program_header.offset(), program_header.size_in_image());
// FIXME: Parse CORE notes. Notes are in JSON format on SerenityOS, but vary between systems.
printf("%s\n", program_header.raw_data());
return IterationDecision::Continue;
});
if (!found_notes)
printf("No core notes in this file.\n");
printf("\n");
}
if (display_dynamic_symbol_table || display_symbol_table) {
auto found_dynamic_symbol_table = false;
interpreter_image.for_each_section([&found_dynamic_symbol_table](const ELF::Image::Section& section) {
if (section.name() != ELF_DYNSYM)
return IterationDecision::Continue;
found_dynamic_symbol_table = true;
if (!section.entry_count()) {
printf("Symbol table '%s' contains zero entries.\n", ELF_DYNSYM);
return IterationDecision::Continue;
}
printf("Symbol table '%s' contains %u entries.\n", ELF_DYNSYM, section.entry_count());
// TODO: display dynamic symbol table
return IterationDecision::Continue;
});
if (!found_dynamic_symbol_table)
printf("No dynamic symbol information for this file.\n");
printf("\n");
}
if (display_symbol_table) {
if (interpreter_image.symbol_count()) {
printf("Symbol table '%s' contains %u entries:\n", ELF_SYMTAB, interpreter_image.symbol_count());
printf(" Num: Value Size Type Bind Name\n");
interpreter_image.for_each_symbol([](const ELF::Image::Symbol& sym) {
printf(" %4u: ", sym.index());
printf("%08x ", sym.value());
printf("%08x ", sym.size());
printf("%-8s ", object_symbol_type_to_string(sym.type()));
printf("%-8s ", object_symbol_binding_to_string(sym.bind()));
printf("%s", StringView(sym.name()).to_string().characters());
printf("\n");
return IterationDecision::Continue;
});
}
printf("\n");
}
return 0;
}
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