mirror of
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586 lines
18 KiB
C++
586 lines
18 KiB
C++
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#include "verify.h"
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#include <algorithm>
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#include <fmt/format.h>
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#include <set>
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#include <zlib.h>
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static bool
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sValidateRelocsAddTable(const Rpl &rpl,
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const Section §ion)
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{
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const auto &header = section.header;
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if (!header.size) {
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return true;
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}
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auto entsize = static_cast<uint32_t>(header.entsize);
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if (!entsize) {
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entsize = static_cast<uint32_t>(sizeof(elf::Rela));
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}
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if (entsize < sizeof(elf::Rela)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0002E);
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return false;
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}
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auto numRelas = (header.size / entsize);
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if (!numRelas) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0000A);
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return false;
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}
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if (!header.link || header.link >= rpl.header.shnum) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0000B);
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return false;
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}
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const auto &symbolSection = rpl.sections[header.link];
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if (symbolSection.header.type != elf::SHT_SYMTAB) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0000C);
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return false;
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}
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auto symEntsize = symbolSection.header.entsize ?
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static_cast<uint32_t>(symbolSection.header.entsize) :
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static_cast<uint32_t>(sizeof(elf::Symbol));
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if (symEntsize < sizeof(elf::Symbol)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0002F);
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return false;
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}
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if (header.info >= rpl.header.shnum) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0000D);
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return false;
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}
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const auto &targetSection = rpl.sections[header.info];
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if (targetSection.header.type != elf::SHT_NULL) {
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auto numSymbols = symbolSection.data.size() / symEntsize;
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for (auto i = 0u; i < numRelas; ++i) {
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auto rela = reinterpret_cast<const elf::Rela *>(section.data.data() + i * entsize);
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if (rela->info && (rela->info >> 8) >= numSymbols) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0000F);
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return false;
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}
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}
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}
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return true;
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}
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static bool
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sValidateSymbolTable(const Rpl &rpl,
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const Section §ion)
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{
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auto result = true;
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const auto &header = section.header;
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if (!header.size) {
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return true;
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}
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const Section *symStrTabSection = nullptr;
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if (header.link) {
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if (header.link >= rpl.header.shnum) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00001);
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return false;
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}
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symStrTabSection = &rpl.sections[header.link];
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if (symStrTabSection->header.type != elf::SHT_STRTAB) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00002);
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return false;
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}
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}
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auto entsize = header.entsize ?
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static_cast<uint32_t>(header.entsize) :
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static_cast<uint32_t>(sizeof(elf::Symbol));
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if (entsize < sizeof(elf::Symbol)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0002D);
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return false;
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}
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auto numSymbols = header.size / entsize;
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if (!numSymbols) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00003);
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result = false;
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}
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for (auto i = 0u; i < numSymbols; ++i) {
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auto symbol = reinterpret_cast<const elf::Symbol *>(section.data.data() + i * entsize);
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if (symStrTabSection &&
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symbol->name > symStrTabSection->data.size()) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00004);
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}
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auto type = symbol->info & 0xF;
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if (symbol->shndx &&
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symbol->shndx < elf::SHN_LORESERVE &&
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type != elf::STT_SECTION &&
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type != elf::STT_FILE) {
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if (symbol->shndx >= rpl.header.shnum) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00005);
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result = false;
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} else if (type == elf::STT_OBJECT) {
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const auto &targetSection = rpl.sections[symbol->shndx];
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auto targetSectionSize = targetSection.data.size() ?
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static_cast<uint32_t>(targetSection.data.size()) :
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static_cast<uint32_t>(targetSection.header.size);
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if (targetSectionSize &&
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targetSection.header.flags & elf::SHF_ALLOC) {
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if (targetSection.header.type == elf::SHT_NULL) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00006);
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result = false;
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}
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auto position = symbol->value - targetSection.header.addr;
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if (position > targetSectionSize || position + symbol->size > targetSectionSize) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00007);
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result = false;
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}
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}
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} else if (type == elf::STT_FUNC) {
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const auto &targetSection = rpl.sections[symbol->shndx];
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auto targetSectionSize = targetSection.data.size() ?
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static_cast<uint32_t>(targetSection.data.size()) :
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static_cast<uint32_t>(targetSection.header.size);
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if (targetSectionSize &&
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targetSection.header.flags & elf::SHF_ALLOC) {
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if (targetSection.header.type == elf::SHT_NULL) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00008);
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result = false;
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}
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auto position = symbol->value - targetSection.header.addr;
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if (position > targetSectionSize || position + symbol->size > targetSectionSize) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00009);
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result = false;
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}
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}
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}
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}
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}
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return result;
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}
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/**
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* Equivalent to loader.elf ELFFILE_ValidateAndPrepare
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*/
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bool
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verifyFile(const Rpl &rpl)
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{
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const auto &header = rpl.header;
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auto result = true;
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if (rpl.fileSize < 0x104) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00018);
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return false;
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}
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if (header.magic != elf::HeaderMagic) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00019);
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result = false;
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}
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if (header.fileClass != elf::ELFCLASS32) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001A);
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result = false;
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}
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if (header.elfVersion > elf::EV_CURRENT) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001B);
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result = false;
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}
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if (!header.machine) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001C);
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result = false;
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}
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if (!header.version != 1) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001D);
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result = false;
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}
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auto ehsize = static_cast<uint32_t>(header.ehsize);
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if (ehsize) {
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if (header.ehsize < sizeof(elf::Header)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001E);
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result = false;
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}
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} else {
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ehsize = static_cast<uint32_t>(sizeof(elf::Header));
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}
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auto phoff = header.phoff;
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if (phoff && (phoff < ehsize || phoff >= rpl.fileSize)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0001F);
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result = false;
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}
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auto shoff = header.shoff;
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if (shoff && (shoff < ehsize || shoff >= rpl.fileSize)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00020);
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result = false;
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}
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if (header.shstrndx && header.shstrndx >= header.shnum) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00021);
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result = false;
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}
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auto phentsize = header.phentsize ?
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static_cast<uint16_t>(header.phentsize) :
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static_cast<uint16_t>(32);
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if (header.phoff &&
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(header.phoff + phentsize * header.phnum) > rpl.fileSize) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00022);
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result = false;
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}
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auto shentsize = header.shentsize ?
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static_cast<uint32_t>(header.shentsize) :
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static_cast<uint32_t>(sizeof(elf::SectionHeader));
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if (header.shoff &&
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(header.shoff + shentsize * header.shnum) > rpl.fileSize) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00023);
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result = false;
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}
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for (auto §ion : rpl.sections) {
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if (section.header.size &&
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section.header.type != elf::SHT_NOBITS) {
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if (section.header.offset < ehsize) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00024);
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result = false;
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}
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if (section.header.offset >= shoff &&
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section.header.offset < (shoff + header.shnum * shentsize)) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD00027);
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result = false;
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}
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}
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}
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if (header.shstrndx) {
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const auto &shStrTabSection = rpl.sections[header.shstrndx];
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if (shStrTabSection.header.type != elf::SHT_STRTAB) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0002A);
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result = false;
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} else {
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for (auto §ion : rpl.sections) {
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if (section.header.name >= shStrTabSection.data.size()) {
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fmt::format("*** Failed ELF file checks (err=0x{:08X})\n", 0xBAD0002B);
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result = false;
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}
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}
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}
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}
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for (const auto §ion : rpl.sections) {
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if (section.header.type == elf::SHT_RELA) {
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result = sValidateRelocsAddTable(rpl, section) && result;
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} else if (section.header.type == elf::SHT_SYMTAB) {
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result = sValidateSymbolTable(rpl, section) && result;
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}
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}
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return result;
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}
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/**
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* Verify values in SHT_RPL_CRCS
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*/
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bool
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verifyCrcs(const Rpl &rpl)
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{
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const elf::RplCrc *crcs = NULL;
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auto result = true;
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for (const auto §ion : rpl.sections) {
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if (section.header.type == elf::SHT_RPL_CRCS) {
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crcs = reinterpret_cast<const elf::RplCrc *>(section.data.data());
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break;
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}
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}
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if (!crcs) {
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return false;
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}
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auto sectionIndex = 0u;
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for (const auto §ion : rpl.sections) {
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auto crc = uint32_t { 0u };
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if (section.header.type != elf::SHT_RPL_CRCS &&
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section.data.size()) {
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crc = crc32(0, Z_NULL, 0);
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crc = crc32(crc, reinterpret_cast<const Bytef *>(section.data.data()), section.data.size());
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}
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if (crc != crcs[sectionIndex].crc) {
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fmt::print("Unexpected crc for section {}, read 0x{:08X} but calculated 0x{:08X}",
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sectionIndex, crcs[sectionIndex].crc, crc);
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result = false;
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}
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sectionIndex++;
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}
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return result;
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}
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/**
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* Equivalent to loader.elf LiCheckFileBounds
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*/
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bool
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verifyFileBounds(const Rpl &rpl)
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{
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auto result = true;
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auto dataMin = -1;
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auto dataMax = 0;
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auto readMin = -1;
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auto readMax = 0;
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auto textMin = -1;
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auto textMax = 0;
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auto tempMin = -1;
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auto tempMax = 0;
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for (const auto §ion : rpl.sections) {
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if (section.header.size == 0 ||
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section.header.type == elf::SHT_RPL_FILEINFO ||
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section.header.type == elf::SHT_RPL_CRCS ||
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section.header.type == elf::SHT_NOBITS ||
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section.header.type == elf::SHT_RPL_IMPORTS) {
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continue;
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}
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if ((section.header.flags & elf::SHF_EXECINSTR) &&
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section.header.type != elf::SHT_RPL_EXPORTS) {
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textMin = std::min(textMin, static_cast<int32_t>(section.header.offset));
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textMax = std::min(textMax, static_cast<int32_t>(section.header.offset + section.header.size));
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} else {
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if (section.header.flags & elf::SHF_ALLOC) {
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if (section.header.flags & elf::SHF_WRITE) {
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dataMin = std::min(dataMin, static_cast<int32_t>(section.header.offset));
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dataMax = std::min(dataMax, static_cast<int32_t>(section.header.offset + section.header.size));
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} else {
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readMin = std::min(readMin, static_cast<int32_t>(section.header.offset));
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readMax = std::min(readMax, static_cast<int32_t>(section.header.offset + section.header.size));
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}
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} else {
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tempMin = std::min(tempMin, static_cast<int32_t>(section.header.offset));
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tempMax = std::min(tempMax, static_cast<int32_t>(section.header.offset + section.header.size));
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}
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}
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}
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if (dataMin == -1) {
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dataMax = (rpl.header.shnum * rpl.header.shentsize) + rpl.header.shoff;
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}
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if (readMin == -1) {
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readMin = dataMax;
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readMax = dataMax;
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}
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if (textMin == -1) {
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textMin = readMax;
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textMax = readMax;
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}
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if (tempMin == -1) {
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tempMin = textMax;
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tempMax = textMax;
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}
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if (dataMin < rpl.header.shoff) {
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fmt::print("*** SecHrs, FileInfo, or CRCs in bad spot in file. Return %d.\n", -470026);
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result = false;
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}
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// Data
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if (dataMin > dataMax) {
|
||
|
fmt::print("*** DataMin > DataMax. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (dataMin > readMin) {
|
||
|
fmt::print("*** DataMin > ReadMin. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (dataMax > readMin) {
|
||
|
fmt::print("*** DataMax > ReadMin, break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
// Read
|
||
|
if (readMin > readMax) {
|
||
|
fmt::print("*** ReadMin > ReadMax. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (readMin > textMin) {
|
||
|
fmt::print("*** ReadMin > TextMin. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (readMax > textMin) {
|
||
|
fmt::print("*** ReadMax > TextMin. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
// Text
|
||
|
if (textMin > textMax) {
|
||
|
fmt::print("*** TextMin > TextMax. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (textMin > tempMin) {
|
||
|
fmt::print("*** TextMin > TempMin. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (textMax > tempMin) {
|
||
|
fmt::print("*** TextMax > TempMin. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
// Temp
|
||
|
if (tempMin > tempMax) {
|
||
|
fmt::print("*** TempMin > TempMax. break.\n");
|
||
|
result = false;
|
||
|
}
|
||
|
|
||
|
if (!result) {
|
||
|
fmt::print("dataMin = 0x{:08X}\n", dataMin);
|
||
|
fmt::print("dataMax = 0x{:08X}\n", dataMax);
|
||
|
fmt::print("readMin = 0x{:08X}\n", readMin);
|
||
|
fmt::print("readMax = 0x{:08X}\n", readMax);
|
||
|
fmt::print("textMin = 0x{:08X}\n", textMin);
|
||
|
fmt::print("textMax = 0x{:08X}\n", textMax);
|
||
|
fmt::print("tempMin = 0x{:08X}\n", tempMin);
|
||
|
fmt::print("tempMax = 0x{:08X}\n", tempMax);
|
||
|
}
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Check that the rpl only uses relocation types which are supported by
|
||
|
* loader.elf
|
||
|
*/
|
||
|
bool
|
||
|
verifyRelocationTypes(const Rpl &rpl)
|
||
|
{
|
||
|
std::set<unsigned int> unsupportedTypes;
|
||
|
|
||
|
for (auto §ion : rpl.sections) {
|
||
|
if (section.header.type != elf::SHT_RELA) {
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
auto &symbolSection = rpl.sections[section.header.link];
|
||
|
auto &targetSection = rpl.sections[section.header.info];
|
||
|
auto rels = reinterpret_cast<const elf::Rela *>(section.data.data());
|
||
|
auto numRels = section.data.size() / sizeof(elf::Rela);
|
||
|
|
||
|
for (auto i = 0u; i < numRels; ++i) {
|
||
|
auto info = rels[i].info;
|
||
|
auto addend = rels[i].addend;
|
||
|
auto offset = rels[i].offset;
|
||
|
auto index = info >> 8;
|
||
|
auto type = info & 0xFF;
|
||
|
|
||
|
switch (type) {
|
||
|
case elf::R_PPC_NONE:
|
||
|
case elf::R_PPC_ADDR32:
|
||
|
case elf::R_PPC_ADDR16_LO:
|
||
|
case elf::R_PPC_ADDR16_HI:
|
||
|
case elf::R_PPC_ADDR16_HA:
|
||
|
case elf::R_PPC_REL24:
|
||
|
case elf::R_PPC_REL14:
|
||
|
case elf::R_PPC_DTPMOD32:
|
||
|
case elf::R_PPC_DTPREL32:
|
||
|
case elf::R_PPC_EMB_SDA21:
|
||
|
case elf::R_PPC_EMB_RELSDA:
|
||
|
case elf::R_PPC_DIAB_SDA21_LO:
|
||
|
case elf::R_PPC_DIAB_SDA21_HI:
|
||
|
case elf::R_PPC_DIAB_SDA21_HA:
|
||
|
case elf::R_PPC_DIAB_RELSDA_LO:
|
||
|
case elf::R_PPC_DIAB_RELSDA_HI:
|
||
|
case elf::R_PPC_DIAB_RELSDA_HA:
|
||
|
case elf::R_PPC_GHS_REL16_HA:
|
||
|
case elf::R_PPC_GHS_REL16_HI:
|
||
|
case elf::R_PPC_GHS_REL16_LO:
|
||
|
// All valid relocations on Wii U, do nothing
|
||
|
break;
|
||
|
default:
|
||
|
// Only print error once per type
|
||
|
if (!unsupportedTypes.count(type)) {
|
||
|
fmt::print("Unsupported relocation type {}\n", type);
|
||
|
unsupportedTypes.insert(type);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return unsupportedTypes.empty();
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Verify that section.addr is aligned by section.addralign
|
||
|
*/
|
||
|
bool
|
||
|
verifySectionAlignment(const Rpl &rpl)
|
||
|
{
|
||
|
auto result = true;
|
||
|
for (auto §ion : rpl.sections) {
|
||
|
if (!align_check(section.header.addr, section.header.addralign)) {
|
||
|
fmt::print("Unaligned section {}, addr {}, addralign {}",
|
||
|
getSectionIndex(rpl, section),
|
||
|
section.header.addr,
|
||
|
section.header.addralign);
|
||
|
result = false;
|
||
|
}
|
||
|
}
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
|
||
|
bool
|
||
|
verifySectionOrder(const Rpl &rpl)
|
||
|
{
|
||
|
auto lastSection = rpl.sections[rpl.header.shnum - 1];
|
||
|
auto penultimateSection = rpl.sections[rpl.header.shnum - 2];
|
||
|
|
||
|
|
||
|
if (lastSection.header.type != elf::SHT_RPL_FILEINFO ||
|
||
|
(lastSection.header.flags & elf::SHF_DEFLATED)) {
|
||
|
fmt::print("***shnum-1 section type = 0x{:08X}, flags=0x{:08X}\n",
|
||
|
lastSection.header.type,
|
||
|
lastSection.header.flags);
|
||
|
}
|
||
|
|
||
|
if (penultimateSection.header.type != elf::SHT_RPL_CRCS ||
|
||
|
(penultimateSection.header.flags & elf::SHF_DEFLATED)) {
|
||
|
fmt::print("***shnum-2 section type = 0x{:08X}, flags=0x{:08X}\n",
|
||
|
penultimateSection.header.type,
|
||
|
penultimateSection.header.flags);
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|