| //===-- DynamicLoaderDarwinKernel.cpp -----------------------------*- C++ |
| //-*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "Plugins/Platform/MacOSX/PlatformDarwinKernel.h" |
| #include "lldb/Breakpoint/StoppointCallbackContext.h" |
| #include "lldb/Core/Debugger.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/ModuleSpec.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/Section.h" |
| #include "lldb/Core/StreamFile.h" |
| #include "lldb/Host/Symbols.h" |
| #include "lldb/Interpreter/OptionValueProperties.h" |
| #include "lldb/Symbol/ObjectFile.h" |
| #include "lldb/Target/OperatingSystem.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/StackFrame.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/ThreadPlanRunToAddress.h" |
| #include "lldb/Utility/DataBuffer.h" |
| #include "lldb/Utility/DataBufferHeap.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/State.h" |
| |
| #include "DynamicLoaderDarwinKernel.h" |
| |
| //#define ENABLE_DEBUG_PRINTF // COMMENT THIS LINE OUT PRIOR TO CHECKIN |
| #ifdef ENABLE_DEBUG_PRINTF |
| #include <stdio.h> |
| #define DEBUG_PRINTF(fmt, ...) printf(fmt, ##__VA_ARGS__) |
| #else |
| #define DEBUG_PRINTF(fmt, ...) |
| #endif |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // Progressively greater amounts of scanning we will allow For some targets |
| // very early in startup, we can't do any random reads of memory or we can |
| // crash the device so a setting is needed that can completely disable the |
| // KASLR scans. |
| |
| enum KASLRScanType { |
| eKASLRScanNone = 0, // No reading into the inferior at all |
| eKASLRScanLowgloAddresses, // Check one word of memory for a possible kernel |
| // addr, then see if a kernel is there |
| eKASLRScanNearPC, // Scan backwards from the current $pc looking for kernel; |
| // checking at 96 locations total |
| eKASLRScanExhaustiveScan // Scan through the entire possible kernel address |
| // range looking for a kernel |
| }; |
| |
| static constexpr OptionEnumValueElement g_kaslr_kernel_scan_enum_values[] = { |
| {eKASLRScanNone, "none", |
| "Do not read memory looking for a Darwin kernel when attaching."}, |
| {eKASLRScanLowgloAddresses, "basic", "Check for the Darwin kernel's load " |
| "addr in the lowglo page " |
| "(boot-args=debug) only."}, |
| {eKASLRScanNearPC, "fast-scan", "Scan near the pc value on attach to find " |
| "the Darwin kernel's load address."}, |
| {eKASLRScanExhaustiveScan, "exhaustive-scan", |
| "Scan through the entire potential address range of Darwin kernel (only " |
| "on 32-bit targets)."}}; |
| |
| static constexpr PropertyDefinition g_properties[] = { |
| {"load-kexts", OptionValue::eTypeBoolean, true, true, NULL, {}, |
| "Automatically loads kext images when attaching to a kernel."}, |
| {"scan-type", OptionValue::eTypeEnum, true, eKASLRScanNearPC, NULL, |
| OptionEnumValues(g_kaslr_kernel_scan_enum_values), |
| "Control how many reads lldb will make while searching for a Darwin " |
| "kernel on attach."}}; |
| |
| enum { ePropertyLoadKexts, ePropertyScanType }; |
| |
| class DynamicLoaderDarwinKernelProperties : public Properties { |
| public: |
| static ConstString &GetSettingName() { |
| static ConstString g_setting_name("darwin-kernel"); |
| return g_setting_name; |
| } |
| |
| DynamicLoaderDarwinKernelProperties() : Properties() { |
| m_collection_sp.reset(new OptionValueProperties(GetSettingName())); |
| m_collection_sp->Initialize(g_properties); |
| } |
| |
| virtual ~DynamicLoaderDarwinKernelProperties() {} |
| |
| bool GetLoadKexts() const { |
| const uint32_t idx = ePropertyLoadKexts; |
| return m_collection_sp->GetPropertyAtIndexAsBoolean( |
| NULL, idx, g_properties[idx].default_uint_value != 0); |
| } |
| |
| KASLRScanType GetScanType() const { |
| const uint32_t idx = ePropertyScanType; |
| return (KASLRScanType)m_collection_sp->GetPropertyAtIndexAsEnumeration( |
| NULL, idx, g_properties[idx].default_uint_value); |
| } |
| }; |
| |
| typedef std::shared_ptr<DynamicLoaderDarwinKernelProperties> |
| DynamicLoaderDarwinKernelPropertiesSP; |
| |
| static const DynamicLoaderDarwinKernelPropertiesSP &GetGlobalProperties() { |
| static DynamicLoaderDarwinKernelPropertiesSP g_settings_sp; |
| if (!g_settings_sp) |
| g_settings_sp.reset(new DynamicLoaderDarwinKernelProperties()); |
| return g_settings_sp; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Create an instance of this class. This function is filled into the plugin |
| // info class that gets handed out by the plugin factory and allows the lldb to |
| // instantiate an instance of this class. |
| //---------------------------------------------------------------------- |
| DynamicLoader *DynamicLoaderDarwinKernel::CreateInstance(Process *process, |
| bool force) { |
| if (!force) { |
| // If the user provided an executable binary and it is not a kernel, this |
| // plugin should not create an instance. |
| Module *exe_module = process->GetTarget().GetExecutableModulePointer(); |
| if (exe_module) { |
| ObjectFile *object_file = exe_module->GetObjectFile(); |
| if (object_file) { |
| if (object_file->GetStrata() != ObjectFile::eStrataKernel) { |
| return NULL; |
| } |
| } |
| } |
| |
| // If the target's architecture does not look like an Apple environment, |
| // this plugin should not create an instance. |
| const llvm::Triple &triple_ref = |
| process->GetTarget().GetArchitecture().GetTriple(); |
| switch (triple_ref.getOS()) { |
| case llvm::Triple::Darwin: |
| case llvm::Triple::MacOSX: |
| case llvm::Triple::IOS: |
| case llvm::Triple::TvOS: |
| case llvm::Triple::WatchOS: |
| // NEED_BRIDGEOS_TRIPLE case llvm::Triple::BridgeOS: |
| if (triple_ref.getVendor() != llvm::Triple::Apple) { |
| return NULL; |
| } |
| break; |
| // If we have triple like armv7-unknown-unknown, we should try looking for |
| // a Darwin kernel. |
| case llvm::Triple::UnknownOS: |
| break; |
| default: |
| return NULL; |
| break; |
| } |
| } |
| |
| // At this point if there is an ExecutableModule, it is a kernel and the |
| // Target is some variant of an Apple system. If the Process hasn't provided |
| // the kernel load address, we need to look around in memory to find it. |
| |
| const addr_t kernel_load_address = SearchForDarwinKernel(process); |
| if (CheckForKernelImageAtAddress(kernel_load_address, process).IsValid()) { |
| process->SetCanRunCode(false); |
| return new DynamicLoaderDarwinKernel(process, kernel_load_address); |
| } |
| return NULL; |
| } |
| |
| lldb::addr_t |
| DynamicLoaderDarwinKernel::SearchForDarwinKernel(Process *process) { |
| addr_t kernel_load_address = process->GetImageInfoAddress(); |
| if (kernel_load_address == LLDB_INVALID_ADDRESS) { |
| kernel_load_address = SearchForKernelAtSameLoadAddr(process); |
| if (kernel_load_address == LLDB_INVALID_ADDRESS) { |
| kernel_load_address = SearchForKernelWithDebugHints(process); |
| if (kernel_load_address == LLDB_INVALID_ADDRESS) { |
| kernel_load_address = SearchForKernelNearPC(process); |
| if (kernel_load_address == LLDB_INVALID_ADDRESS) { |
| kernel_load_address = SearchForKernelViaExhaustiveSearch(process); |
| } |
| } |
| } |
| } |
| return kernel_load_address; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Check if the kernel binary is loaded in memory without a slide. First verify |
| // that the ExecutableModule is a kernel before we proceed. Returns the address |
| // of the kernel if one was found, else LLDB_INVALID_ADDRESS. |
| //---------------------------------------------------------------------- |
| lldb::addr_t |
| DynamicLoaderDarwinKernel::SearchForKernelAtSameLoadAddr(Process *process) { |
| Module *exe_module = process->GetTarget().GetExecutableModulePointer(); |
| if (exe_module == NULL) |
| return LLDB_INVALID_ADDRESS; |
| |
| ObjectFile *exe_objfile = exe_module->GetObjectFile(); |
| if (exe_objfile == NULL) |
| return LLDB_INVALID_ADDRESS; |
| |
| if (exe_objfile->GetType() != ObjectFile::eTypeExecutable || |
| exe_objfile->GetStrata() != ObjectFile::eStrataKernel) |
| return LLDB_INVALID_ADDRESS; |
| |
| if (!exe_objfile->GetBaseAddress().IsValid()) |
| return LLDB_INVALID_ADDRESS; |
| |
| if (CheckForKernelImageAtAddress( |
| exe_objfile->GetBaseAddress().GetFileAddress(), process) == |
| exe_module->GetUUID()) |
| return exe_objfile->GetBaseAddress().GetFileAddress(); |
| |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // If the debug flag is included in the boot-args nvram setting, the kernel's |
| // load address will be noted in the lowglo page at a fixed address Returns the |
| // address of the kernel if one was found, else LLDB_INVALID_ADDRESS. |
| //---------------------------------------------------------------------- |
| lldb::addr_t |
| DynamicLoaderDarwinKernel::SearchForKernelWithDebugHints(Process *process) { |
| if (GetGlobalProperties()->GetScanType() == eKASLRScanNone) |
| return LLDB_INVALID_ADDRESS; |
| |
| Status read_err; |
| addr_t kernel_addresses_64[] = { |
| 0xfffffff000004010ULL, // newest arm64 devices |
| 0xffffff8000004010ULL, // 2014-2015-ish arm64 devices |
| 0xffffff8000002010ULL, // oldest arm64 devices |
| LLDB_INVALID_ADDRESS}; |
| addr_t kernel_addresses_32[] = {0xffff0110, // 2016 and earlier armv7 devices |
| 0xffff1010, |
| LLDB_INVALID_ADDRESS}; |
| |
| uint8_t uval[8]; |
| if (process->GetAddressByteSize() == 8) { |
| for (size_t i = 0; kernel_addresses_64[i] != LLDB_INVALID_ADDRESS; i++) { |
| if (process->ReadMemoryFromInferior (kernel_addresses_64[i], uval, 8, read_err) == 8) |
| { |
| DataExtractor data (&uval, 8, process->GetByteOrder(), process->GetAddressByteSize()); |
| offset_t offset = 0; |
| uint64_t addr = data.GetU64 (&offset); |
| if (CheckForKernelImageAtAddress(addr, process).IsValid()) { |
| return addr; |
| } |
| } |
| } |
| } |
| |
| if (process->GetAddressByteSize() == 4) { |
| for (size_t i = 0; kernel_addresses_32[i] != LLDB_INVALID_ADDRESS; i++) { |
| if (process->ReadMemoryFromInferior (kernel_addresses_32[i], uval, 4, read_err) == 4) |
| { |
| DataExtractor data (&uval, 4, process->GetByteOrder(), process->GetAddressByteSize()); |
| offset_t offset = 0; |
| uint32_t addr = data.GetU32 (&offset); |
| if (CheckForKernelImageAtAddress(addr, process).IsValid()) { |
| return addr; |
| } |
| } |
| } |
| } |
| |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // If the kernel is currently executing when lldb attaches, and we don't have a |
| // better way of finding the kernel's load address, try searching backwards |
| // from the current pc value looking for the kernel's Mach header in memory. |
| // Returns the address of the kernel if one was found, else |
| // LLDB_INVALID_ADDRESS. |
| //---------------------------------------------------------------------- |
| lldb::addr_t |
| DynamicLoaderDarwinKernel::SearchForKernelNearPC(Process *process) { |
| if (GetGlobalProperties()->GetScanType() == eKASLRScanNone || |
| GetGlobalProperties()->GetScanType() == eKASLRScanLowgloAddresses) { |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| ThreadSP thread = process->GetThreadList().GetSelectedThread(); |
| if (thread.get() == NULL) |
| return LLDB_INVALID_ADDRESS; |
| addr_t pc = thread->GetRegisterContext()->GetPC(LLDB_INVALID_ADDRESS); |
| |
| // The kernel is always loaded in high memory, if the top bit is zero, |
| // this isn't a kernel. |
| if (process->GetTarget().GetArchitecture().GetAddressByteSize() == 8) { |
| if ((pc & (1ULL << 63)) == 0) { |
| return LLDB_INVALID_ADDRESS; |
| } |
| } else { |
| if ((pc & (1ULL << 31)) == 0) { |
| return LLDB_INVALID_ADDRESS; |
| } |
| } |
| |
| if (pc == LLDB_INVALID_ADDRESS) |
| return LLDB_INVALID_ADDRESS; |
| |
| // The kernel will load at at one megabyte boundary (0x100000), or at that |
| // boundary plus an offset of one page (0x1000) or two, or four (0x4000), |
| // depending on the device. |
| |
| // Round the current pc down to the nearest one megabyte boundary - the place |
| // where we will start searching. |
| addr_t addr = pc & ~0xfffff; |
| |
| // Search backwards 32 megabytes, looking for the start of the kernel at each |
| // one-megabyte boundary. |
| for (int i = 0; i < 32; i++, addr -= 0x100000) { |
| // x86_64 kernels are at offset 0 |
| if (CheckForKernelImageAtAddress(addr, process).IsValid()) |
| return addr; |
| // 32-bit arm kernels are at offset 0x1000 (one 4k page) |
| if (CheckForKernelImageAtAddress(addr + 0x1000, process).IsValid()) |
| return addr + 0x1000; |
| // 64-bit arm kernels are at offset 0x4000 (one 16k page) |
| if (CheckForKernelImageAtAddress(addr + 0x4000, process).IsValid()) |
| return addr + 0x4000; |
| } |
| |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Scan through the valid address range for a kernel binary. This is uselessly |
| // slow in 64-bit environments so we don't even try it. This scan is not |
| // enabled by default even for 32-bit targets. Returns the address of the |
| // kernel if one was found, else LLDB_INVALID_ADDRESS. |
| //---------------------------------------------------------------------- |
| lldb::addr_t DynamicLoaderDarwinKernel::SearchForKernelViaExhaustiveSearch( |
| Process *process) { |
| if (GetGlobalProperties()->GetScanType() != eKASLRScanExhaustiveScan) { |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| addr_t kernel_range_low, kernel_range_high; |
| if (process->GetTarget().GetArchitecture().GetAddressByteSize() == 8) { |
| kernel_range_low = 1ULL << 63; |
| kernel_range_high = UINT64_MAX; |
| } else { |
| kernel_range_low = 1ULL << 31; |
| kernel_range_high = UINT32_MAX; |
| } |
| |
| // Stepping through memory at one-megabyte resolution looking for a kernel |
| // rarely works (fast enough) with a 64-bit address space -- for now, let's |
| // not even bother. We may be attaching to something which *isn't* a kernel |
| // and we don't want to spin for minutes on-end looking for a kernel. |
| if (process->GetTarget().GetArchitecture().GetAddressByteSize() == 8) |
| return LLDB_INVALID_ADDRESS; |
| |
| addr_t addr = kernel_range_low; |
| |
| while (addr >= kernel_range_low && addr < kernel_range_high) { |
| // x86_64 kernels are at offset 0 |
| if (CheckForKernelImageAtAddress(addr, process).IsValid()) |
| return addr; |
| // 32-bit arm kernels are at offset 0x1000 (one 4k page) |
| if (CheckForKernelImageAtAddress(addr + 0x1000, process).IsValid()) |
| return addr + 0x1000; |
| // 64-bit arm kernels are at offset 0x4000 (one 16k page) |
| if (CheckForKernelImageAtAddress(addr + 0x4000, process).IsValid()) |
| return addr + 0x4000; |
| addr += 0x100000; |
| } |
| return LLDB_INVALID_ADDRESS; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Read the mach_header struct out of memory and return it. |
| // Returns true if the mach_header was successfully read, |
| // Returns false if there was a problem reading the header, or it was not |
| // a Mach-O header. |
| //---------------------------------------------------------------------- |
| |
| bool |
| DynamicLoaderDarwinKernel::ReadMachHeader(addr_t addr, Process *process, llvm::MachO::mach_header &header) { |
| Status read_error; |
| |
| // Read the mach header and see whether it looks like a kernel |
| if (process->DoReadMemory (addr, &header, sizeof(header), read_error) != |
| sizeof(header)) |
| return false; |
| |
| const uint32_t magicks[] = { llvm::MachO::MH_MAGIC_64, llvm::MachO::MH_MAGIC, llvm::MachO::MH_CIGAM, llvm::MachO::MH_CIGAM_64}; |
| |
| bool found_matching_pattern = false; |
| for (size_t i = 0; i < llvm::array_lengthof (magicks); i++) |
| if (::memcmp (&header.magic, &magicks[i], sizeof (uint32_t)) == 0) |
| found_matching_pattern = true; |
| |
| if (!found_matching_pattern) |
| return false; |
| |
| if (header.magic == llvm::MachO::MH_CIGAM || |
| header.magic == llvm::MachO::MH_CIGAM_64) { |
| header.magic = llvm::ByteSwap_32(header.magic); |
| header.cputype = llvm::ByteSwap_32(header.cputype); |
| header.cpusubtype = llvm::ByteSwap_32(header.cpusubtype); |
| header.filetype = llvm::ByteSwap_32(header.filetype); |
| header.ncmds = llvm::ByteSwap_32(header.ncmds); |
| header.sizeofcmds = llvm::ByteSwap_32(header.sizeofcmds); |
| header.flags = llvm::ByteSwap_32(header.flags); |
| } |
| |
| return true; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Given an address in memory, look to see if there is a kernel image at that |
| // address. |
| // Returns a UUID; if a kernel was not found at that address, UUID.IsValid() |
| // will be false. |
| //---------------------------------------------------------------------- |
| lldb_private::UUID |
| DynamicLoaderDarwinKernel::CheckForKernelImageAtAddress(lldb::addr_t addr, |
| Process *process) { |
| Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (addr == LLDB_INVALID_ADDRESS) |
| return UUID(); |
| |
| if (log) |
| log->Printf("DynamicLoaderDarwinKernel::CheckForKernelImageAtAddress: " |
| "looking for kernel binary at 0x%" PRIx64, |
| addr); |
| |
| llvm::MachO::mach_header header; |
| |
| if (!ReadMachHeader(addr, process, header)) |
| return UUID(); |
| |
| // First try a quick test -- read the first 4 bytes and see if there is a |
| // valid Mach-O magic field there |
| // (the first field of the mach_header/mach_header_64 struct). |
| // A kernel is an executable which does not have the dynamic link object flag |
| // set. |
| if (header.filetype == llvm::MachO::MH_EXECUTE && |
| (header.flags & llvm::MachO::MH_DYLDLINK) == 0) { |
| // Create a full module to get the UUID |
| ModuleSP memory_module_sp = |
| process->ReadModuleFromMemory(FileSpec("temp_mach_kernel"), addr); |
| if (!memory_module_sp.get()) |
| return UUID(); |
| |
| ObjectFile *exe_objfile = memory_module_sp->GetObjectFile(); |
| if (exe_objfile == NULL) { |
| if (log) |
| log->Printf("DynamicLoaderDarwinKernel::CheckForKernelImageAtAddress " |
| "found a binary at 0x%" PRIx64 |
| " but could not create an object file from memory", |
| addr); |
| return UUID(); |
| } |
| |
| if (exe_objfile->GetType() == ObjectFile::eTypeExecutable && |
| exe_objfile->GetStrata() == ObjectFile::eStrataKernel) { |
| ArchSpec kernel_arch(eArchTypeMachO, header.cputype, header.cpusubtype); |
| if (!process->GetTarget().GetArchitecture().IsCompatibleMatch( |
| kernel_arch)) { |
| process->GetTarget().SetArchitecture(kernel_arch); |
| } |
| if (log) { |
| std::string uuid_str; |
| if (memory_module_sp->GetUUID().IsValid()) { |
| uuid_str = "with UUID "; |
| uuid_str += memory_module_sp->GetUUID().GetAsString(); |
| } else { |
| uuid_str = "and no LC_UUID found in load commands "; |
| } |
| log->Printf( |
| "DynamicLoaderDarwinKernel::CheckForKernelImageAtAddress: " |
| "kernel binary image found at 0x%" PRIx64 " with arch '%s' %s", |
| addr, kernel_arch.GetTriple().str().c_str(), uuid_str.c_str()); |
| } |
| return memory_module_sp->GetUUID(); |
| } |
| } |
| |
| return UUID(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Constructor |
| //---------------------------------------------------------------------- |
| DynamicLoaderDarwinKernel::DynamicLoaderDarwinKernel(Process *process, |
| lldb::addr_t kernel_addr) |
| : DynamicLoader(process), m_kernel_load_address(kernel_addr), m_kernel(), |
| m_kext_summary_header_ptr_addr(), m_kext_summary_header_addr(), |
| m_kext_summary_header(), m_known_kexts(), m_mutex(), |
| m_break_id(LLDB_INVALID_BREAK_ID) { |
| Status error; |
| PlatformSP platform_sp( |
| Platform::Create(PlatformDarwinKernel::GetPluginNameStatic(), error)); |
| // Only select the darwin-kernel Platform if we've been asked to load kexts. |
| // It can take some time to scan over all of the kext info.plists and that |
| // shouldn't be done if kext loading is explicitly disabled. |
| if (platform_sp.get() && GetGlobalProperties()->GetLoadKexts()) { |
| process->GetTarget().SetPlatform(platform_sp); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Destructor |
| //---------------------------------------------------------------------- |
| DynamicLoaderDarwinKernel::~DynamicLoaderDarwinKernel() { Clear(true); } |
| |
| void DynamicLoaderDarwinKernel::UpdateIfNeeded() { |
| LoadKernelModuleIfNeeded(); |
| SetNotificationBreakpointIfNeeded(); |
| } |
| //------------------------------------------------------------------ |
| /// Called after attaching a process. |
| /// |
| /// Allow DynamicLoader plug-ins to execute some code after |
| /// attaching to a process. |
| //------------------------------------------------------------------ |
| void DynamicLoaderDarwinKernel::DidAttach() { |
| PrivateInitialize(m_process); |
| UpdateIfNeeded(); |
| } |
| |
| //------------------------------------------------------------------ |
| /// Called after attaching a process. |
| /// |
| /// Allow DynamicLoader plug-ins to execute some code after |
| /// attaching to a process. |
| //------------------------------------------------------------------ |
| void DynamicLoaderDarwinKernel::DidLaunch() { |
| PrivateInitialize(m_process); |
| UpdateIfNeeded(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Clear out the state of this class. |
| //---------------------------------------------------------------------- |
| void DynamicLoaderDarwinKernel::Clear(bool clear_process) { |
| std::lock_guard<std::recursive_mutex> guard(m_mutex); |
| |
| if (m_process->IsAlive() && LLDB_BREAK_ID_IS_VALID(m_break_id)) |
| m_process->ClearBreakpointSiteByID(m_break_id); |
| |
| if (clear_process) |
| m_process = NULL; |
| m_kernel.Clear(); |
| m_known_kexts.clear(); |
| m_kext_summary_header_ptr_addr.Clear(); |
| m_kext_summary_header_addr.Clear(); |
| m_break_id = LLDB_INVALID_BREAK_ID; |
| } |
| |
| bool DynamicLoaderDarwinKernel::KextImageInfo::LoadImageAtFileAddress( |
| Process *process) { |
| if (IsLoaded()) |
| return true; |
| |
| if (m_module_sp) { |
| bool changed = false; |
| if (m_module_sp->SetLoadAddress(process->GetTarget(), 0, true, changed)) |
| m_load_process_stop_id = process->GetStopID(); |
| } |
| return false; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetModule(ModuleSP module_sp) { |
| m_module_sp = module_sp; |
| if (module_sp.get() && module_sp->GetObjectFile()) { |
| if (module_sp->GetObjectFile()->GetType() == ObjectFile::eTypeExecutable && |
| module_sp->GetObjectFile()->GetStrata() == ObjectFile::eStrataKernel) { |
| m_kernel_image = true; |
| } else { |
| m_kernel_image = false; |
| } |
| } |
| } |
| |
| ModuleSP DynamicLoaderDarwinKernel::KextImageInfo::GetModule() { |
| return m_module_sp; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetLoadAddress( |
| addr_t load_addr) { |
| m_load_address = load_addr; |
| } |
| |
| addr_t DynamicLoaderDarwinKernel::KextImageInfo::GetLoadAddress() const { |
| return m_load_address; |
| } |
| |
| uint64_t DynamicLoaderDarwinKernel::KextImageInfo::GetSize() const { |
| return m_size; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetSize(uint64_t size) { |
| m_size = size; |
| } |
| |
| uint32_t DynamicLoaderDarwinKernel::KextImageInfo::GetProcessStopId() const { |
| return m_load_process_stop_id; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetProcessStopId( |
| uint32_t stop_id) { |
| m_load_process_stop_id = stop_id; |
| } |
| |
| bool DynamicLoaderDarwinKernel::KextImageInfo:: |
| operator==(const KextImageInfo &rhs) { |
| if (m_uuid.IsValid() || rhs.GetUUID().IsValid()) { |
| return m_uuid == rhs.GetUUID(); |
| } |
| |
| return m_name == rhs.GetName() && m_load_address == rhs.GetLoadAddress(); |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetName(const char *name) { |
| m_name = name; |
| } |
| |
| std::string DynamicLoaderDarwinKernel::KextImageInfo::GetName() const { |
| return m_name; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetUUID(const UUID &uuid) { |
| m_uuid = uuid; |
| } |
| |
| UUID DynamicLoaderDarwinKernel::KextImageInfo::GetUUID() const { |
| return m_uuid; |
| } |
| |
| // Given the m_load_address from the kext summaries, and a UUID, try to create |
| // an in-memory Module at that address. Require that the MemoryModule have a |
| // matching UUID and detect if this MemoryModule is a kernel or a kext. |
| // |
| // Returns true if m_memory_module_sp is now set to a valid Module. |
| |
| bool DynamicLoaderDarwinKernel::KextImageInfo::ReadMemoryModule( |
| Process *process) { |
| Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST); |
| if (m_memory_module_sp.get() != NULL) |
| return true; |
| if (m_load_address == LLDB_INVALID_ADDRESS) |
| return false; |
| |
| FileSpec file_spec(m_name.c_str()); |
| |
| llvm::MachO::mach_header mh; |
| size_t size_to_read = 512; |
| if (ReadMachHeader(m_load_address, process, mh)) { |
| if (mh.magic == llvm::MachO::MH_CIGAM || mh.magic == llvm::MachO::MH_MAGIC) |
| size_to_read = sizeof(llvm::MachO::mach_header) + mh.sizeofcmds; |
| if (mh.magic == llvm::MachO::MH_CIGAM_64 || |
| mh.magic == llvm::MachO::MH_MAGIC_64) |
| size_to_read = sizeof(llvm::MachO::mach_header_64) + mh.sizeofcmds; |
| } |
| |
| ModuleSP memory_module_sp = |
| process->ReadModuleFromMemory(file_spec, m_load_address, size_to_read); |
| |
| if (memory_module_sp.get() == NULL) |
| return false; |
| |
| bool is_kernel = false; |
| if (memory_module_sp->GetObjectFile()) { |
| if (memory_module_sp->GetObjectFile()->GetType() == |
| ObjectFile::eTypeExecutable && |
| memory_module_sp->GetObjectFile()->GetStrata() == |
| ObjectFile::eStrataKernel) { |
| is_kernel = true; |
| } else if (memory_module_sp->GetObjectFile()->GetType() == |
| ObjectFile::eTypeSharedLibrary) { |
| is_kernel = false; |
| } |
| } |
| |
| // If this is a kext, and the kernel specified what UUID we should find at |
| // this load address, require that the memory module have a matching UUID or |
| // something has gone wrong and we should discard it. |
| if (m_uuid.IsValid()) { |
| if (m_uuid != memory_module_sp->GetUUID()) { |
| if (log) { |
| log->Printf("KextImageInfo::ReadMemoryModule the kernel said to find " |
| "uuid %s at 0x%" PRIx64 |
| " but instead we found uuid %s, throwing it away", |
| m_uuid.GetAsString().c_str(), m_load_address, |
| memory_module_sp->GetUUID().GetAsString().c_str()); |
| } |
| return false; |
| } |
| } |
| |
| // If the in-memory Module has a UUID, let's use that. |
| if (!m_uuid.IsValid() && memory_module_sp->GetUUID().IsValid()) { |
| m_uuid = memory_module_sp->GetUUID(); |
| } |
| |
| m_memory_module_sp = memory_module_sp; |
| m_kernel_image = is_kernel; |
| if (is_kernel) { |
| if (log) { |
| // This is unusual and probably not intended |
| log->Printf("KextImageInfo::ReadMemoryModule read the kernel binary out " |
| "of memory"); |
| } |
| if (memory_module_sp->GetArchitecture().IsValid()) { |
| process->GetTarget().SetArchitecture(memory_module_sp->GetArchitecture()); |
| } |
| if (m_uuid.IsValid()) { |
| ModuleSP exe_module_sp = process->GetTarget().GetExecutableModule(); |
| if (exe_module_sp.get() && exe_module_sp->GetUUID().IsValid()) { |
| if (m_uuid != exe_module_sp->GetUUID()) { |
| // The user specified a kernel binary that has a different UUID than |
| // the kernel actually running in memory. This never ends well; |
| // clear the user specified kernel binary from the Target. |
| |
| m_module_sp.reset(); |
| |
| ModuleList user_specified_kernel_list; |
| user_specified_kernel_list.Append(exe_module_sp); |
| process->GetTarget().GetImages().Remove(user_specified_kernel_list); |
| } |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| bool DynamicLoaderDarwinKernel::KextImageInfo::IsKernel() const { |
| return m_kernel_image; |
| } |
| |
| void DynamicLoaderDarwinKernel::KextImageInfo::SetIsKernel(bool is_kernel) { |
| m_kernel_image = is_kernel; |
| } |
| |
| bool DynamicLoaderDarwinKernel::KextImageInfo::LoadImageUsingMemoryModule( |
| Process *process) { |
| if (IsLoaded()) |
| return true; |
| |
| Target &target = process->GetTarget(); |
| |
| // If we don't have / can't create a memory module for this kext, don't try |
| // to load it - we won't have the correct segment load addresses. |
| if (!ReadMemoryModule(process)) { |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("Unable to read '%s' from memory at address 0x%" PRIx64 |
| " to get the segment load addresses.", |
| m_name.c_str(), m_load_address); |
| return false; |
| } |
| |
| bool uuid_is_valid = m_uuid.IsValid(); |
| |
| if (IsKernel() && uuid_is_valid && m_memory_module_sp.get()) { |
| Stream *s = target.GetDebugger().GetOutputFile().get(); |
| if (s) { |
| s->Printf("Kernel UUID: %s\n", |
| m_memory_module_sp->GetUUID().GetAsString().c_str()); |
| s->Printf("Load Address: 0x%" PRIx64 "\n", m_load_address); |
| } |
| } |
| |
| if (!m_module_sp) { |
| // See if the kext has already been loaded into the target, probably by the |
| // user doing target modules add. |
| const ModuleList &target_images = target.GetImages(); |
| m_module_sp = target_images.FindModule(m_uuid); |
| |
| // Search for the kext on the local filesystem via the UUID |
| if (!m_module_sp && uuid_is_valid) { |
| ModuleSpec module_spec; |
| module_spec.GetUUID() = m_uuid; |
| module_spec.GetArchitecture() = target.GetArchitecture(); |
| |
| // For the kernel, we really do need an on-disk file copy of the binary |
| // to do anything useful. This will force a clal to |
| if (IsKernel()) { |
| if (Symbols::DownloadObjectAndSymbolFile(module_spec, true)) { |
| if (FileSystem::Instance().Exists(module_spec.GetFileSpec())) { |
| m_module_sp.reset(new Module(module_spec.GetFileSpec(), |
| target.GetArchitecture())); |
| if (m_module_sp.get() && |
| m_module_sp->MatchesModuleSpec(module_spec)) { |
| ModuleList loaded_module_list; |
| loaded_module_list.Append(m_module_sp); |
| target.ModulesDidLoad(loaded_module_list); |
| } |
| } |
| } |
| } |
| |
| // If the current platform is PlatformDarwinKernel, create a ModuleSpec |
| // with the filename set to be the bundle ID for this kext, e.g. |
| // "com.apple.filesystems.msdosfs", and ask the platform to find it. |
| PlatformSP platform_sp(target.GetPlatform()); |
| if (!m_module_sp && platform_sp) { |
| ConstString platform_name(platform_sp->GetPluginName()); |
| static ConstString g_platform_name( |
| PlatformDarwinKernel::GetPluginNameStatic()); |
| if (platform_name == g_platform_name) { |
| ModuleSpec kext_bundle_module_spec(module_spec); |
| FileSpec kext_filespec(m_name.c_str()); |
| kext_bundle_module_spec.GetFileSpec() = kext_filespec; |
| platform_sp->GetSharedModule( |
| kext_bundle_module_spec, process, m_module_sp, |
| &target.GetExecutableSearchPaths(), NULL, NULL); |
| } |
| } |
| |
| // Ask the Target to find this file on the local system, if possible. |
| // This will search in the list of currently-loaded files, look in the |
| // standard search paths on the system, and on a Mac it will try calling |
| // the DebugSymbols framework with the UUID to find the binary via its |
| // search methods. |
| if (!m_module_sp) { |
| m_module_sp = target.GetSharedModule(module_spec); |
| } |
| |
| if (IsKernel() && !m_module_sp) { |
| Stream *s = target.GetDebugger().GetOutputFile().get(); |
| if (s) { |
| s->Printf("WARNING: Unable to locate kernel binary on the debugger " |
| "system.\n"); |
| } |
| } |
| } |
| |
| // If we managed to find a module, append it to the target's list of |
| // images. If we also have a memory module, require that they have matching |
| // UUIDs |
| if (m_module_sp) { |
| bool uuid_match_ok = true; |
| if (m_memory_module_sp) { |
| if (m_module_sp->GetUUID() != m_memory_module_sp->GetUUID()) { |
| uuid_match_ok = false; |
| } |
| } |
| if (uuid_match_ok) { |
| target.GetImages().AppendIfNeeded(m_module_sp); |
| if (IsKernel() && |
| target.GetExecutableModulePointer() != m_module_sp.get()) { |
| target.SetExecutableModule(m_module_sp, eLoadDependentsNo); |
| } |
| } |
| } |
| } |
| |
| if (!m_module_sp && !IsKernel() && m_uuid.IsValid() && !m_name.empty()) { |
| Stream *s = target.GetDebugger().GetOutputFile().get(); |
| if (s) { |
| s->Printf("warning: Can't find binary/dSYM for %s (%s)\n", m_name.c_str(), |
| m_uuid.GetAsString().c_str()); |
| } |
| } |
| |
| static ConstString g_section_name_LINKEDIT("__LINKEDIT"); |
| |
| if (m_memory_module_sp && m_module_sp) { |
| if (m_module_sp->GetUUID() == m_memory_module_sp->GetUUID()) { |
| ObjectFile *ondisk_object_file = m_module_sp->GetObjectFile(); |
| ObjectFile *memory_object_file = m_memory_module_sp->GetObjectFile(); |
| |
| if (memory_object_file && ondisk_object_file) { |
| // The memory_module for kexts may have an invalid __LINKEDIT seg; skip |
| // it. |
| const bool ignore_linkedit = !IsKernel(); |
| |
| SectionList *ondisk_section_list = ondisk_object_file->GetSectionList(); |
| SectionList *memory_section_list = memory_object_file->GetSectionList(); |
| if (memory_section_list && ondisk_section_list) { |
| const uint32_t num_ondisk_sections = ondisk_section_list->GetSize(); |
| // There may be CTF sections in the memory image so we can't always |
| // just compare the number of sections (which are actually segments |
| // in mach-o parlance) |
| uint32_t sect_idx = 0; |
| |
| // Use the memory_module's addresses for each section to set the file |
| // module's load address as appropriate. We don't want to use a |
| // single slide value for the entire kext - different segments may be |
| // slid different amounts by the kext loader. |
| |
| uint32_t num_sections_loaded = 0; |
| for (sect_idx = 0; sect_idx < num_ondisk_sections; ++sect_idx) { |
| SectionSP ondisk_section_sp( |
| ondisk_section_list->GetSectionAtIndex(sect_idx)); |
| if (ondisk_section_sp) { |
| // Don't ever load __LINKEDIT as it may or may not be actually |
| // mapped into memory and there is no current way to tell. |
| // I filed rdar://problem/12851706 to track being able to tell |
| // if the __LINKEDIT is actually mapped, but until then, we need |
| // to not load the __LINKEDIT |
| if (ignore_linkedit && |
| ondisk_section_sp->GetName() == g_section_name_LINKEDIT) |
| continue; |
| |
| const Section *memory_section = |
| memory_section_list |
| ->FindSectionByName(ondisk_section_sp->GetName()) |
| .get(); |
| if (memory_section) { |
| target.SetSectionLoadAddress(ondisk_section_sp, |
| memory_section->GetFileAddress()); |
| ++num_sections_loaded; |
| } |
| } |
| } |
| if (num_sections_loaded > 0) |
| m_load_process_stop_id = process->GetStopID(); |
| else |
| m_module_sp.reset(); // No sections were loaded |
| } else |
| m_module_sp.reset(); // One or both section lists |
| } else |
| m_module_sp.reset(); // One or both object files missing |
| } else |
| m_module_sp.reset(); // UUID mismatch |
| } |
| |
| bool is_loaded = IsLoaded(); |
| |
| if (is_loaded && m_module_sp && IsKernel()) { |
| Stream *s = target.GetDebugger().GetOutputFile().get(); |
| if (s) { |
| ObjectFile *kernel_object_file = m_module_sp->GetObjectFile(); |
| if (kernel_object_file) { |
| addr_t file_address = |
| kernel_object_file->GetBaseAddress().GetFileAddress(); |
| if (m_load_address != LLDB_INVALID_ADDRESS && |
| file_address != LLDB_INVALID_ADDRESS) { |
| s->Printf("Kernel slid 0x%" PRIx64 " in memory.\n", |
| m_load_address - file_address); |
| } |
| } |
| { |
| s->Printf("Loaded kernel file %s\n", |
| m_module_sp->GetFileSpec().GetPath().c_str()); |
| } |
| s->Flush(); |
| } |
| } |
| return is_loaded; |
| } |
| |
| uint32_t DynamicLoaderDarwinKernel::KextImageInfo::GetAddressByteSize() { |
| if (m_memory_module_sp) |
| return m_memory_module_sp->GetArchitecture().GetAddressByteSize(); |
| if (m_module_sp) |
| return m_module_sp->GetArchitecture().GetAddressByteSize(); |
| return 0; |
| } |
| |
| lldb::ByteOrder DynamicLoaderDarwinKernel::KextImageInfo::GetByteOrder() { |
| if (m_memory_module_sp) |
| return m_memory_module_sp->GetArchitecture().GetByteOrder(); |
| if (m_module_sp) |
| return m_module_sp->GetArchitecture().GetByteOrder(); |
| return endian::InlHostByteOrder(); |
| } |
| |
| lldb_private::ArchSpec |
| DynamicLoaderDarwinKernel::KextImageInfo::GetArchitecture() const { |
| if (m_memory_module_sp) |
| return m_memory_module_sp->GetArchitecture(); |
| if (m_module_sp) |
| return m_module_sp->GetArchitecture(); |
| return lldb_private::ArchSpec(); |
| } |
| |
| //---------------------------------------------------------------------- |
| // Load the kernel module and initialize the "m_kernel" member. Return true |
| // _only_ if the kernel is loaded the first time through (subsequent calls to |
| // this function should return false after the kernel has been already loaded). |
| //---------------------------------------------------------------------- |
| void DynamicLoaderDarwinKernel::LoadKernelModuleIfNeeded() { |
| if (!m_kext_summary_header_ptr_addr.IsValid()) { |
| m_kernel.Clear(); |
| m_kernel.SetModule(m_process->GetTarget().GetExecutableModule()); |
| m_kernel.SetIsKernel(true); |
| |
| ConstString kernel_name("mach_kernel"); |
| if (m_kernel.GetModule().get() && m_kernel.GetModule()->GetObjectFile() && |
| !m_kernel.GetModule() |
| ->GetObjectFile() |
| ->GetFileSpec() |
| .GetFilename() |
| .IsEmpty()) { |
| kernel_name = |
| m_kernel.GetModule()->GetObjectFile()->GetFileSpec().GetFilename(); |
| } |
| m_kernel.SetName(kernel_name.AsCString()); |
| |
| if (m_kernel.GetLoadAddress() == LLDB_INVALID_ADDRESS) { |
| m_kernel.SetLoadAddress(m_kernel_load_address); |
| if (m_kernel.GetLoadAddress() == LLDB_INVALID_ADDRESS && |
| m_kernel.GetModule()) { |
| // We didn't get a hint from the process, so we will try the kernel at |
| // the address that it exists at in the file if we have one |
| ObjectFile *kernel_object_file = m_kernel.GetModule()->GetObjectFile(); |
| if (kernel_object_file) { |
| addr_t load_address = |
| kernel_object_file->GetBaseAddress().GetLoadAddress( |
| &m_process->GetTarget()); |
| addr_t file_address = |
| kernel_object_file->GetBaseAddress().GetFileAddress(); |
| if (load_address != LLDB_INVALID_ADDRESS && load_address != 0) { |
| m_kernel.SetLoadAddress(load_address); |
| if (load_address != file_address) { |
| // Don't accidentally relocate the kernel to the File address -- |
| // the Load address has already been set to its actual in-memory |
| // address. Mark it as IsLoaded. |
| m_kernel.SetProcessStopId(m_process->GetStopID()); |
| } |
| } else { |
| m_kernel.SetLoadAddress(file_address); |
| } |
| } |
| } |
| } |
| |
| if (m_kernel.GetLoadAddress() != LLDB_INVALID_ADDRESS) { |
| if (!m_kernel.LoadImageUsingMemoryModule(m_process)) { |
| m_kernel.LoadImageAtFileAddress(m_process); |
| } |
| } |
| |
| // The operating system plugin gets loaded and initialized in |
| // LoadImageUsingMemoryModule when we discover the kernel dSYM. For a core |
| // file in particular, that's the wrong place to do this, since we haven't |
| // fixed up the section addresses yet. So let's redo it here. |
| LoadOperatingSystemPlugin(false); |
| |
| if (m_kernel.IsLoaded() && m_kernel.GetModule()) { |
| static ConstString kext_summary_symbol("gLoadedKextSummaries"); |
| const Symbol *symbol = |
| m_kernel.GetModule()->FindFirstSymbolWithNameAndType( |
| kext_summary_symbol, eSymbolTypeData); |
| if (symbol) { |
| m_kext_summary_header_ptr_addr = symbol->GetAddress(); |
| // Update all image infos |
| ReadAllKextSummaries(); |
| } |
| } else { |
| m_kernel.Clear(); |
| } |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Static callback function that gets called when our DYLD notification |
| // breakpoint gets hit. We update all of our image infos and then let our super |
| // class DynamicLoader class decide if we should stop or not (based on global |
| // preference). |
| //---------------------------------------------------------------------- |
| bool DynamicLoaderDarwinKernel::BreakpointHitCallback( |
| void *baton, StoppointCallbackContext *context, user_id_t break_id, |
| user_id_t break_loc_id) { |
| return static_cast<DynamicLoaderDarwinKernel *>(baton)->BreakpointHit( |
| context, break_id, break_loc_id); |
| } |
| |
| bool DynamicLoaderDarwinKernel::BreakpointHit(StoppointCallbackContext *context, |
| user_id_t break_id, |
| user_id_t break_loc_id) { |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("DynamicLoaderDarwinKernel::BreakpointHit (...)\n"); |
| |
| ReadAllKextSummaries(); |
| |
| if (log) |
| PutToLog(log); |
| |
| return GetStopWhenImagesChange(); |
| } |
| |
| bool DynamicLoaderDarwinKernel::ReadKextSummaryHeader() { |
| std::lock_guard<std::recursive_mutex> guard(m_mutex); |
| |
| // the all image infos is already valid for this process stop ID |
| |
| if (m_kext_summary_header_ptr_addr.IsValid()) { |
| const uint32_t addr_size = m_kernel.GetAddressByteSize(); |
| const ByteOrder byte_order = m_kernel.GetByteOrder(); |
| Status error; |
| // Read enough bytes for a "OSKextLoadedKextSummaryHeader" structure which |
| // is currently 4 uint32_t and a pointer. |
| uint8_t buf[24]; |
| DataExtractor data(buf, sizeof(buf), byte_order, addr_size); |
| const size_t count = 4 * sizeof(uint32_t) + addr_size; |
| const bool prefer_file_cache = false; |
| if (m_process->GetTarget().ReadPointerFromMemory( |
| m_kext_summary_header_ptr_addr, prefer_file_cache, error, |
| m_kext_summary_header_addr)) { |
| // We got a valid address for our kext summary header and make sure it |
| // isn't NULL |
| if (m_kext_summary_header_addr.IsValid() && |
| m_kext_summary_header_addr.GetFileAddress() != 0) { |
| const size_t bytes_read = m_process->GetTarget().ReadMemory( |
| m_kext_summary_header_addr, prefer_file_cache, buf, count, error); |
| if (bytes_read == count) { |
| lldb::offset_t offset = 0; |
| m_kext_summary_header.version = data.GetU32(&offset); |
| if (m_kext_summary_header.version > 128) { |
| Stream *s = |
| m_process->GetTarget().GetDebugger().GetOutputFile().get(); |
| s->Printf("WARNING: Unable to read kext summary header, got " |
| "improbable version number %u\n", |
| m_kext_summary_header.version); |
| // If we get an improbably large version number, we're probably |
| // getting bad memory. |
| m_kext_summary_header_addr.Clear(); |
| return false; |
| } |
| if (m_kext_summary_header.version >= 2) { |
| m_kext_summary_header.entry_size = data.GetU32(&offset); |
| if (m_kext_summary_header.entry_size > 4096) { |
| // If we get an improbably large entry_size, we're probably |
| // getting bad memory. |
| Stream *s = |
| m_process->GetTarget().GetDebugger().GetOutputFile().get(); |
| s->Printf("WARNING: Unable to read kext summary header, got " |
| "improbable entry_size %u\n", |
| m_kext_summary_header.entry_size); |
| m_kext_summary_header_addr.Clear(); |
| return false; |
| } |
| } else { |
| // Versions less than 2 didn't have an entry size, it was hard |
| // coded |
| m_kext_summary_header.entry_size = |
| KERNEL_MODULE_ENTRY_SIZE_VERSION_1; |
| } |
| m_kext_summary_header.entry_count = data.GetU32(&offset); |
| if (m_kext_summary_header.entry_count > 10000) { |
| // If we get an improbably large number of kexts, we're probably |
| // getting bad memory. |
| Stream *s = |
| m_process->GetTarget().GetDebugger().GetOutputFile().get(); |
| s->Printf("WARNING: Unable to read kext summary header, got " |
| "improbable number of kexts %u\n", |
| m_kext_summary_header.entry_count); |
| m_kext_summary_header_addr.Clear(); |
| return false; |
| } |
| return true; |
| } |
| } |
| } |
| } |
| m_kext_summary_header_addr.Clear(); |
| return false; |
| } |
| |
| // We've either (a) just attached to a new kernel, or (b) the kexts-changed |
| // breakpoint was hit and we need to figure out what kexts have been added or |
| // removed. Read the kext summaries from the inferior kernel memory, compare |
| // them against the m_known_kexts vector and update the m_known_kexts vector as |
| // needed to keep in sync with the inferior. |
| |
| bool DynamicLoaderDarwinKernel::ParseKextSummaries( |
| const Address &kext_summary_addr, uint32_t count) { |
| KextImageInfo::collection kext_summaries; |
| Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER)); |
| if (log) |
| log->Printf("Kexts-changed breakpoint hit, there are %d kexts currently.\n", |
| count); |
| |
| std::lock_guard<std::recursive_mutex> guard(m_mutex); |
| |
| if (!ReadKextSummaries(kext_summary_addr, count, kext_summaries)) |
| return false; |
| |
| // read the plugin.dynamic-loader.darwin-kernel.load-kexts setting -- if the |
| // user requested no kext loading, don't print any messages about kexts & |
| // don't try to read them. |
| const bool load_kexts = GetGlobalProperties()->GetLoadKexts(); |
| |
| // By default, all kexts we've loaded in the past are marked as "remove" and |
| // all of the kexts we just found out about from ReadKextSummaries are marked |
| // as "add". |
| std::vector<bool> to_be_removed(m_known_kexts.size(), true); |
| std::vector<bool> to_be_added(count, true); |
| |
| int number_of_new_kexts_being_added = 0; |
| int number_of_old_kexts_being_removed = m_known_kexts.size(); |
| |
| const uint32_t new_kexts_size = kext_summaries.size(); |
| const uint32_t old_kexts_size = m_known_kexts.size(); |
| |
| // The m_known_kexts vector may have entries that have been Cleared, or are a |
| // kernel. |
| for (uint32_t old_kext = 0; old_kext < old_kexts_size; old_kext++) { |
| bool ignore = false; |
| KextImageInfo &image_info = m_known_kexts[old_kext]; |
| if (image_info.IsKernel()) { |
| ignore = true; |
| } else if (image_info.GetLoadAddress() == LLDB_INVALID_ADDRESS && |
| !image_info.GetModule()) { |
| ignore = true; |
| } |
| |
| if (ignore) { |
| number_of_old_kexts_being_removed--; |
| to_be_removed[old_kext] = false; |
| } |
| } |
| |
| // Scan over the list of kexts we just read from the kernel, note those that |
| // need to be added and those already loaded. |
| for (uint32_t new_kext = 0; new_kext < new_kexts_size; new_kext++) { |
| bool add_this_one = true; |
| for (uint32_t old_kext = 0; old_kext < old_kexts_size; old_kext++) { |
| if (m_known_kexts[old_kext] == kext_summaries[new_kext]) { |
| // We already have this kext, don't re-load it. |
| to_be_added[new_kext] = false; |
| // This kext is still present, do not remove it. |
| to_be_removed[old_kext] = false; |
| |
| number_of_old_kexts_being_removed--; |
| add_this_one = false; |
| break; |
| } |
| } |
| // If this "kext" entry is actually an alias for the kernel -- the kext was |
| // compiled into the kernel or something -- then we don't want to load the |
| // kernel's text section at a different address. Ignore this kext entry. |
| if (kext_summaries[new_kext].GetUUID().IsValid() |
| && m_kernel.GetUUID().IsValid() |
| && kext_summaries[new_kext].GetUUID() == m_kernel.GetUUID()) { |
| to_be_added[new_kext] = false; |
| break; |
| } |
| if (add_this_one) { |
| number_of_new_kexts_being_added++; |
| } |
| } |
| |
| if (number_of_new_kexts_being_added == 0 && |
| number_of_old_kexts_being_removed == 0) |
| return true; |
| |
| Stream *s = m_process->GetTarget().GetDebugger().GetOutputFile().get(); |
| if (s && load_kexts) { |
| if (number_of_new_kexts_being_added > 0 && |
| number_of_old_kexts_being_removed > 0) { |
| s->Printf("Loading %d kext modules and unloading %d kext modules ", |
| number_of_new_kexts_being_added, |
| number_of_old_kexts_being_removed); |
| } else if (number_of_new_kexts_being_added > 0) { |
| s->Printf("Loading %d kext modules ", number_of_new_kexts_being_added); |
| } else if (number_of_old_kexts_being_removed > 0) { |
| s->Printf("Unloading %d kext modules ", |
| number_of_old_kexts_being_removed); |
| } |
| } |
| |
| if (log) { |
| if (load_kexts) { |
| log->Printf("DynamicLoaderDarwinKernel::ParseKextSummaries: %d kexts " |
| "added, %d kexts removed", |
| number_of_new_kexts_being_added, |
| number_of_old_kexts_being_removed); |
| } else { |
| log->Printf( |
| "DynamicLoaderDarwinKernel::ParseKextSummaries kext loading is " |
| "disabled, else would have %d kexts added, %d kexts removed", |
| number_of_new_kexts_being_added, number_of_old_kexts_being_removed); |
| } |
| } |
| |
| if (number_of_new_kexts_being_added > 0) { |
| ModuleList loaded_module_list; |
| |
| const uint32_t num_of_new_kexts = kext_summaries.size(); |
| for (uint32_t new_kext = 0; new_kext < num_of_new_kexts; new_kext++) { |
| if (to_be_added[new_kext]) { |
| KextImageInfo &image_info = kext_summaries[new_kext]; |
| if (load_kexts) { |
| if (!image_info.LoadImageUsingMemoryModule(m_process)) { |
| image_info.LoadImageAtFileAddress(m_process); |
| } |
| } |
| |
| m_known_kexts.push_back(image_info); |
| |
| if (image_info.GetModule() && |
| m_process->GetStopID() == image_info.GetProcessStopId()) |
| loaded_module_list.AppendIfNeeded(image_info.GetModule()); |
| |
| if (s && load_kexts) |
| s->Printf("."); |
| |
| if (log) |
| kext_summaries[new_kext].PutToLog(log); |
| } |
| } |
| m_process->GetTarget().ModulesDidLoad(loaded_module_list); |
| } |
| |
| if (number_of_old_kexts_being_removed > 0) { |
| ModuleList loaded_module_list; |
| const uint32_t num_of_old_kexts = m_known_kexts.size(); |
| for (uint32_t old_kext = 0; old_kext < num_of_old_kexts; old_kext++) { |
| ModuleList unloaded_module_list; |
| if (to_be_removed[old_kext]) { |
| KextImageInfo &image_info = m_known_kexts[old_kext]; |
| // You can't unload the kernel. |
| if (!image_info.IsKernel()) { |
| if (image_info.GetModule()) { |
| unloaded_module_list.AppendIfNeeded(image_info.GetModule()); |
| } |
| if (s) |
| s->Printf("."); |
| image_info.Clear(); |
| // should pull it out of the KextImageInfos vector but that would |
| // mutate the list and invalidate the to_be_removed bool vector; |
| // leaving it in place once Cleared() is relatively harmless. |
| } |
| } |
| m_process->GetTarget().ModulesDidUnload(unloaded_module_list, false); |
| } |
| } |
| |
| if (s && load_kexts) { |
| s->Printf(" done.\n"); |
| s->Flush(); |
| } |
| |
| return true; |
| } |
| |
| uint32_t DynamicLoaderDarwinKernel::ReadKextSummaries( |
| const Address &kext_summary_addr, uint32_t image_infos_count, |
| KextImageInfo::collection &image_infos) { |
| const ByteOrder endian = m_kernel.GetByteOrder(); |
| const uint32_t addr_size = m_kernel.GetAddressByteSize(); |
| |
| image_infos.resize(image_infos_count); |
| const size_t count = image_infos.size() * m_kext_summary_header.entry_size; |
| DataBufferHeap data(count, 0); |
| Status error; |
| |
| const bool prefer_file_cache = false; |
| const size_t bytes_read = m_process->GetTarget().ReadMemory( |
| kext_summary_addr, prefer_file_cache, data.GetBytes(), data.GetByteSize(), |
| error); |
| if (bytes_read == count) { |
| |
| DataExtractor extractor(data.GetBytes(), data.GetByteSize(), endian, |
| addr_size); |
| uint32_t i = 0; |
| for (uint32_t kext_summary_offset = 0; |
| i < image_infos.size() && |
| extractor.ValidOffsetForDataOfSize(kext_summary_offset, |
| m_kext_summary_header.entry_size); |
| ++i, kext_summary_offset += m_kext_summary_header.entry_size) { |
| lldb::offset_t offset = kext_summary_offset; |
| const void *name_data = |
| extractor.GetData(&offset, KERNEL_MODULE_MAX_NAME); |
| if (name_data == NULL) |
| break; |
| image_infos[i].SetName((const char *)name_data); |
| UUID uuid = UUID::fromOptionalData(extractor.GetData(&offset, 16), 16); |
| image_infos[i].SetUUID(uuid); |
| image_infos[i].SetLoadAddress(extractor.GetU64(&offset)); |
| image_infos[i].SetSize(extractor.GetU64(&offset)); |
| } |
| if (i < image_infos.size()) |
| image_infos.resize(i); |
| } else { |
| image_infos.clear(); |
| } |
| return image_infos.size(); |
| } |
| |
| bool DynamicLoaderDarwinKernel::ReadAllKextSummaries() { |
| std::lock_guard<std::recursive_mutex> guard(m_mutex); |
| |
| if (ReadKextSummaryHeader()) { |
| if (m_kext_summary_header.entry_count > 0 && |
| m_kext_summary_header_addr.IsValid()) { |
| Address summary_addr(m_kext_summary_header_addr); |
| summary_addr.Slide(m_kext_summary_header.GetSize()); |
| if (!ParseKextSummaries(summary_addr, |
| m_kext_summary_header.entry_count)) { |
| m_known_kexts.clear(); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| //---------------------------------------------------------------------- |
| // Dump an image info structure to the file handle provided. |
| //---------------------------------------------------------------------- |
| void DynamicLoaderDarwinKernel::KextImageInfo::PutToLog(Log *log) const { |
| if (m_load_address == LLDB_INVALID_ADDRESS) { |
| LLDB_LOG(log, "uuid={0} name=\"{1}\" (UNLOADED)", m_uuid.GetAsString(), |
| m_name); |
| } else { |
| LLDB_LOG(log, "addr={0:x+16} size={1:x+16} uuid={2} name=\"{3}\"", |
| m_load_address, m_size, m_uuid.GetAsString(), m_name); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Dump the _dyld_all_image_infos members and all current image infos that we |
| // have parsed to the file handle provided. |
| //---------------------------------------------------------------------- |
| void DynamicLoaderDarwinKernel::PutToLog(Log *log) const { |
| if (log == NULL) |
| return; |
| |
| std::lock_guard<std::recursive_mutex> guard(m_mutex); |
| log->Printf("gLoadedKextSummaries = 0x%16.16" PRIx64 |
| " { version=%u, entry_size=%u, entry_count=%u }", |
| m_kext_summary_header_addr.GetFileAddress(), |
| m_kext_summary_header.version, m_kext_summary_header.entry_size, |
| m_kext_summary_header.entry_count); |
| |
| size_t i; |
| const size_t count = m_known_kexts.size(); |
| if (count > 0) { |
| log->PutCString("Loaded:"); |
| for (i = 0; i < count; i++) |
| m_known_kexts[i].PutToLog(log); |
| } |
| } |
| |
| void DynamicLoaderDarwinKernel::PrivateInitialize(Process *process) { |
| DEBUG_PRINTF("DynamicLoaderDarwinKernel::%s() process state = %s\n", |
| __FUNCTION__, StateAsCString(m_process->GetState())); |
| Clear(true); |
| m_process = process; |
| } |
| |
| void DynamicLoaderDarwinKernel::SetNotificationBreakpointIfNeeded() { |
| if (m_break_id == LLDB_INVALID_BREAK_ID && m_kernel.GetModule()) { |
| DEBUG_PRINTF("DynamicLoaderDarwinKernel::%s() process state = %s\n", |
| __FUNCTION__, StateAsCString(m_process->GetState())); |
| |
| const bool internal_bp = true; |
| const bool hardware = false; |
| const LazyBool skip_prologue = eLazyBoolNo; |
| FileSpecList module_spec_list; |
| module_spec_list.Append(m_kernel.GetModule()->GetFileSpec()); |
| Breakpoint *bp = |
| m_process->GetTarget() |
| .CreateBreakpoint(&module_spec_list, NULL, |
| "OSKextLoadedKextSummariesUpdated", |
| eFunctionNameTypeFull, eLanguageTypeUnknown, 0, |
| skip_prologue, internal_bp, hardware) |
| .get(); |
| |
| bp->SetCallback(DynamicLoaderDarwinKernel::BreakpointHitCallback, this, |
| true); |
| m_break_id = bp->GetID(); |
| } |
| } |
| |
| //---------------------------------------------------------------------- |
| // Member function that gets called when the process state changes. |
| //---------------------------------------------------------------------- |
| void DynamicLoaderDarwinKernel::PrivateProcessStateChanged(Process *process, |
| StateType state) { |
| DEBUG_PRINTF("DynamicLoaderDarwinKernel::%s(%s)\n", __FUNCTION__, |
| StateAsCString(state)); |
| switch (state) { |
| case eStateConnected: |
| case eStateAttaching: |
| case eStateLaunching: |
| case eStateInvalid: |
| case eStateUnloaded: |
| case eStateExited: |
| case eStateDetached: |
| Clear(false); |
| break; |
| |
| case eStateStopped: |
| UpdateIfNeeded(); |
| break; |
| |
| case eStateRunning: |
| case eStateStepping: |
| case eStateCrashed: |
| case eStateSuspended: |
| break; |
| } |
| } |
| |
| ThreadPlanSP |
| DynamicLoaderDarwinKernel::GetStepThroughTrampolinePlan(Thread &thread, |
| bool stop_others) { |
| ThreadPlanSP thread_plan_sp; |
| Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP)); |
| if (log) |
| log->Printf("Could not find symbol for step through."); |
| return thread_plan_sp; |
| } |
| |
| Status DynamicLoaderDarwinKernel::CanLoadImage() { |
| Status error; |
| error.SetErrorString( |
| "always unsafe to load or unload shared libraries in the darwin kernel"); |
| return error; |
| } |
| |
| void DynamicLoaderDarwinKernel::Initialize() { |
| PluginManager::RegisterPlugin(GetPluginNameStatic(), |
| GetPluginDescriptionStatic(), CreateInstance, |
| DebuggerInitialize); |
| } |
| |
| void DynamicLoaderDarwinKernel::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| void DynamicLoaderDarwinKernel::DebuggerInitialize( |
| lldb_private::Debugger &debugger) { |
| if (!PluginManager::GetSettingForDynamicLoaderPlugin( |
| debugger, DynamicLoaderDarwinKernelProperties::GetSettingName())) { |
| const bool is_global_setting = true; |
| PluginManager::CreateSettingForDynamicLoaderPlugin( |
| debugger, GetGlobalProperties()->GetValueProperties(), |
| ConstString("Properties for the DynamicLoaderDarwinKernel plug-in."), |
| is_global_setting); |
| } |
| } |
| |
| lldb_private::ConstString DynamicLoaderDarwinKernel::GetPluginNameStatic() { |
| static ConstString g_name("darwin-kernel"); |
| return g_name; |
| } |
| |
| const char *DynamicLoaderDarwinKernel::GetPluginDescriptionStatic() { |
| return "Dynamic loader plug-in that watches for shared library loads/unloads " |
| "in the MacOSX kernel."; |
| } |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| lldb_private::ConstString DynamicLoaderDarwinKernel::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t DynamicLoaderDarwinKernel::GetPluginVersion() { return 1; } |
| |
| lldb::ByteOrder |
| DynamicLoaderDarwinKernel::GetByteOrderFromMagic(uint32_t magic) { |
| switch (magic) { |
| case llvm::MachO::MH_MAGIC: |
| case llvm::MachO::MH_MAGIC_64: |
| return endian::InlHostByteOrder(); |
| |
| case llvm::MachO::MH_CIGAM: |
| case llvm::MachO::MH_CIGAM_64: |
| if (endian::InlHostByteOrder() == lldb::eByteOrderBig) |
| return lldb::eByteOrderLittle; |
| else |
| return lldb::eByteOrderBig; |
| |
| default: |
| break; |
| } |
| return lldb::eByteOrderInvalid; |
| } |