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https://github.com/hyprwm/Hyprland
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pluginAPI/hooks: Remove dependency on cc from the hooksystem (#5801)
* Remove dependency on cc from the hooksystem * Nix: remove cc from wrapper --------- Co-authored-by: Mihai Fufezan <mihai@fufexan.net>
This commit is contained in:
Vaxry
GitHub
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commit
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2 changed files with 39 additions and 77 deletions
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@ -148,7 +148,6 @@ in
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${lib.optionalString wrapRuntimeDeps ''
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wrapProgram $out/bin/Hyprland \
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--suffix PATH : ${lib.makeBinPath [
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stdenv.cc
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binutils
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pciutils
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pkgconf
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@ -76,62 +76,56 @@ CFunctionHook::SAssembly CFunctionHook::fixInstructionProbeRIPCalls(const SInstr
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// actually newline + 1
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size_t lastAsmNewline = 0;
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// needle for destination binary
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size_t currentDestinationOffset = 0;
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std::string assemblyBuilder;
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size_t currentDestinationOffset = 0;
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std::vector<char> finalBytes;
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finalBytes.resize(probe.len);
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for (auto& len : probe.insSizes) {
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// copy original bytes to our finalBytes
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for (size_t i = 0; i < len; ++i) {
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finalBytes[currentDestinationOffset + i] = *(char*)(currentAddress + i);
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}
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std::string code = probe.assembly.substr(lastAsmNewline, probe.assembly.find("\n", lastAsmNewline) - lastAsmNewline);
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if (code.contains("%rip")) {
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CVarList tokens{code, 0, 's'};
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size_t plusPresent = tokens[1][0] == '+' ? 1 : 0;
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size_t minusPresent = tokens[1][0] == '-' ? 1 : 0;
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std::string addr = tokens[1].substr((plusPresent || minusPresent), tokens[1].find("(%rip)") - (plusPresent || minusPresent));
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const uint64_t OFFSET = (minusPresent ? -1 : 1) * configStringToInt(addr);
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CVarList tokens{code, 0, 's'};
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size_t plusPresent = tokens[1][0] == '+' ? 1 : 0;
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size_t minusPresent = tokens[1][0] == '-' ? 1 : 0;
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std::string addr = tokens[1].substr((plusPresent || minusPresent), tokens[1].find("(%rip)") - (plusPresent || minusPresent));
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const int32_t OFFSET = (minusPresent ? -1 : 1) * configStringToInt(addr);
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if (OFFSET == 0)
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return {};
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const uint64_t DESTINATION = currentAddress + OFFSET + len;
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if (code.starts_with("call")) {
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// call +0xdeadbeef(%rip)
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assemblyBuilder += std::format("pushq %rax\nmovabs $0x{:x}, %rax\ncallq *%rax\npopq %rax\n", DESTINATION);
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currentDestinationOffset += 14;
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} else if (code.starts_with("lea")) {
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// lea 0xdeadbeef(%rip), %rax
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assemblyBuilder += std::format("movabs $0x{:x}, {}\n", DESTINATION, tokens[2]);
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currentDestinationOffset += 10;
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} else {
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auto ADDREND = code.find("(%rip)");
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auto ADDRSTART = (code.substr(0, ADDREND).find_last_of(' '));
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auto ADDREND = code.find("(%rip)");
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auto ADDRSTART = (code.substr(0, ADDREND).find_last_of(' '));
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if (ADDREND == std::string::npos || ADDRSTART == std::string::npos)
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return {};
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const uint64_t PREDICTEDRIP = (uint64_t)m_pTrampolineAddr + currentDestinationOffset + len;
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const bool POSITIVE = DESTINATION > PREDICTEDRIP;
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const uint64_t NEWRIPOFFSET = POSITIVE ? DESTINATION - PREDICTEDRIP : PREDICTEDRIP - DESTINATION;
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assemblyBuilder += std::format("{} {}0x{:x}{}\n", code.substr(0, ADDRSTART), POSITIVE ? '+' : '-', NEWRIPOFFSET, code.substr(ADDREND));
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currentDestinationOffset += len;
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}
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} else if (code.contains("invalid")) {
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std::vector<uint8_t> bytes;
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bytes.resize(len);
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memcpy(bytes.data(), (std::byte*)currentAddress, len);
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if (len == 4 && bytes[0] == 0xF3 && bytes[1] == 0x0F && bytes[2] == 0x1E && bytes[3] == 0xFA) {
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// F3 0F 1E FA = endbr64, udis doesn't understand that one
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assemblyBuilder += "endbr64\n";
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currentDestinationOffset += 4;
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} else {
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// raise error, unknown op
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std::string strBytes;
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for (auto& b : bytes) {
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strBytes += std::format("{:x} ", b);
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}
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Debug::log(ERR, "[functionhook] unknown bytes: {}", strBytes);
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if (ADDREND == std::string::npos || ADDRSTART == std::string::npos)
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return {};
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const uint64_t PREDICTEDRIP = (uint64_t)m_pTrampolineAddr + currentDestinationOffset + len;
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const int32_t NEWRIPOFFSET = DESTINATION - PREDICTEDRIP;
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size_t ripOffset = 0;
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// find %rip usage offset from beginning
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for (int i = len - 4 /* 32-bit */; i > 0; --i) {
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if (*(int32_t*)(currentAddress + i) == OFFSET) {
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ripOffset = i;
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break;
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}
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}
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if (ripOffset == 0)
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return {};
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// fix offset in the final bytes. This doesn't care about endianness
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*(int32_t*)&finalBytes[currentDestinationOffset + ripOffset] = NEWRIPOFFSET;
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currentDestinationOffset += len;
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} else {
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assemblyBuilder += code + "\n";
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currentDestinationOffset += len;
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}
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@ -139,38 +133,7 @@ CFunctionHook::SAssembly CFunctionHook::fixInstructionProbeRIPCalls(const SInstr
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currentAddress += len;
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}
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const auto RANDOMDIR = g_pCompositor->m_szInstancePath + "/" + g_pTokenManager->getRandomUUID();
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if (std::filesystem::exists(RANDOMDIR)) {
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Debug::log(ERR, "[hooksystem] random out dir exists??");
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return {};
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}
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if (mkdir(RANDOMDIR.c_str(), S_IRWXU) < 0)
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return {};
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if (!std::filesystem::exists(RANDOMDIR))
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return {};
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std::ofstream ofs(RANDOMDIR + "/.hookcode.asm", std::ios::trunc);
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ofs << assemblyBuilder;
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ofs.close();
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std::string ret = execAndGet(std::string{"cc -x assembler -c " + RANDOMDIR + "/.hookcode.asm -o " + RANDOMDIR + "/.hookbinary.o 2>&1 && objcopy -O binary -j .text " +
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RANDOMDIR + "/.hookbinary.o " + RANDOMDIR + "/.hookbinary2.o 2>&1"}
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.c_str());
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Debug::log(LOG, "[functionhook] assembler returned:\n{}", ret);
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if (!std::filesystem::exists(RANDOMDIR + "/.hookbinary2.o")) {
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std::filesystem::remove(RANDOMDIR + "/.hookcode.asm");
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std::filesystem::remove(RANDOMDIR + "/.hookbinary.asm");
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return {};
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}
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std::ifstream ifs(RANDOMDIR + "/.hookbinary2.o", std::ios::binary);
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returns = {std::vector<char>(std::istreambuf_iterator<char>(ifs), {})};
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ifs.close();
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std::filesystem::remove_all(RANDOMDIR);
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return returns;
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return {finalBytes};
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}
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bool CFunctionHook::hook() {
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