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328 lines
12 KiB
328 lines
12 KiB
//===-- InstrumentationRuntimeASan.cpp ------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "InstrumentationRuntimeASan.h"
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#include "lldb/Breakpoint/StoppointCallbackContext.h"
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#include "lldb/Core/Debugger.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/PluginInterface.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/StreamFile.h"
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#include "lldb/Core/ValueObject.h"
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#include "lldb/Expression/UserExpression.h"
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#include "lldb/Interpreter/CommandReturnObject.h"
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#include "lldb/Symbol/Symbol.h"
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#include "lldb/Target/InstrumentationRuntimeStopInfo.h"
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#include "lldb/Target/StopInfo.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Utility/RegularExpression.h"
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#include "lldb/Utility/Stream.h"
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#include "llvm/ADT/StringSwitch.h"
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using namespace lldb;
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using namespace lldb_private;
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LLDB_PLUGIN_DEFINE(InstrumentationRuntimeASan)
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lldb::InstrumentationRuntimeSP
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InstrumentationRuntimeASan::CreateInstance(const lldb::ProcessSP &process_sp) {
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return InstrumentationRuntimeSP(new InstrumentationRuntimeASan(process_sp));
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}
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void InstrumentationRuntimeASan::Initialize() {
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PluginManager::RegisterPlugin(
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GetPluginNameStatic(), "AddressSanitizer instrumentation runtime plugin.",
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CreateInstance, GetTypeStatic);
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}
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void InstrumentationRuntimeASan::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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lldb_private::ConstString InstrumentationRuntimeASan::GetPluginNameStatic() {
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return ConstString("AddressSanitizer");
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}
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lldb::InstrumentationRuntimeType InstrumentationRuntimeASan::GetTypeStatic() {
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return eInstrumentationRuntimeTypeAddressSanitizer;
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}
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InstrumentationRuntimeASan::~InstrumentationRuntimeASan() { Deactivate(); }
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const RegularExpression &
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InstrumentationRuntimeASan::GetPatternForRuntimeLibrary() {
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// FIXME: This shouldn't include the "dylib" suffix.
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static RegularExpression regex(
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llvm::StringRef("libclang_rt.asan_(.*)_dynamic\\.dylib"));
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return regex;
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}
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bool InstrumentationRuntimeASan::CheckIfRuntimeIsValid(
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const lldb::ModuleSP module_sp) {
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const Symbol *symbol = module_sp->FindFirstSymbolWithNameAndType(
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ConstString("__asan_get_alloc_stack"), lldb::eSymbolTypeAny);
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return symbol != nullptr;
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}
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const char *address_sanitizer_retrieve_report_data_prefix = R"(
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extern "C"
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{
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int __asan_report_present();
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void *__asan_get_report_pc();
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void *__asan_get_report_bp();
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void *__asan_get_report_sp();
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void *__asan_get_report_address();
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const char *__asan_get_report_description();
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int __asan_get_report_access_type();
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size_t __asan_get_report_access_size();
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}
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)";
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const char *address_sanitizer_retrieve_report_data_command = R"(
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struct {
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int present;
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int access_type;
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void *pc;
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void *bp;
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void *sp;
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void *address;
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size_t access_size;
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const char *description;
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} t;
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t.present = __asan_report_present();
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t.access_type = __asan_get_report_access_type();
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t.pc = __asan_get_report_pc();
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t.bp = __asan_get_report_bp();
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t.sp = __asan_get_report_sp();
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t.address = __asan_get_report_address();
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t.access_size = __asan_get_report_access_size();
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t.description = __asan_get_report_description();
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t
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)";
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StructuredData::ObjectSP InstrumentationRuntimeASan::RetrieveReportData() {
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ProcessSP process_sp = GetProcessSP();
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if (!process_sp)
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return StructuredData::ObjectSP();
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ThreadSP thread_sp =
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process_sp->GetThreadList().GetExpressionExecutionThread();
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StackFrameSP frame_sp = thread_sp->GetSelectedFrame();
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if (!frame_sp)
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return StructuredData::ObjectSP();
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EvaluateExpressionOptions options;
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options.SetUnwindOnError(true);
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options.SetTryAllThreads(true);
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options.SetStopOthers(true);
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options.SetIgnoreBreakpoints(true);
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options.SetTimeout(process_sp->GetUtilityExpressionTimeout());
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options.SetPrefix(address_sanitizer_retrieve_report_data_prefix);
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options.SetAutoApplyFixIts(false);
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options.SetLanguage(eLanguageTypeObjC_plus_plus);
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ValueObjectSP return_value_sp;
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ExecutionContext exe_ctx;
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Status eval_error;
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frame_sp->CalculateExecutionContext(exe_ctx);
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ExpressionResults result = UserExpression::Evaluate(
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exe_ctx, options, address_sanitizer_retrieve_report_data_command, "",
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return_value_sp, eval_error);
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if (result != eExpressionCompleted) {
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process_sp->GetTarget().GetDebugger().GetAsyncOutputStream()->Printf(
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"Warning: Cannot evaluate AddressSanitizer expression:\n%s\n",
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eval_error.AsCString());
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return StructuredData::ObjectSP();
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}
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int present = return_value_sp->GetValueForExpressionPath(".present")
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->GetValueAsUnsigned(0);
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if (present != 1)
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return StructuredData::ObjectSP();
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addr_t pc =
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return_value_sp->GetValueForExpressionPath(".pc")->GetValueAsUnsigned(0);
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/* commented out because rdar://problem/18533301
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addr_t bp =
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return_value_sp->GetValueForExpressionPath(".bp")->GetValueAsUnsigned(0);
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addr_t sp =
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return_value_sp->GetValueForExpressionPath(".sp")->GetValueAsUnsigned(0);
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*/
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addr_t address = return_value_sp->GetValueForExpressionPath(".address")
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->GetValueAsUnsigned(0);
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addr_t access_type =
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return_value_sp->GetValueForExpressionPath(".access_type")
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->GetValueAsUnsigned(0);
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addr_t access_size =
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return_value_sp->GetValueForExpressionPath(".access_size")
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->GetValueAsUnsigned(0);
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addr_t description_ptr =
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return_value_sp->GetValueForExpressionPath(".description")
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->GetValueAsUnsigned(0);
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std::string description;
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Status error;
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process_sp->ReadCStringFromMemory(description_ptr, description, error);
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StructuredData::Dictionary *dict = new StructuredData::Dictionary();
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dict->AddStringItem("instrumentation_class", "AddressSanitizer");
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dict->AddStringItem("stop_type", "fatal_error");
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dict->AddIntegerItem("pc", pc);
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/* commented out because rdar://problem/18533301
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dict->AddIntegerItem("bp", bp);
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dict->AddIntegerItem("sp", sp);
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*/
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dict->AddIntegerItem("address", address);
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dict->AddIntegerItem("access_type", access_type);
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dict->AddIntegerItem("access_size", access_size);
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dict->AddStringItem("description", description);
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return StructuredData::ObjectSP(dict);
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}
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std::string
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InstrumentationRuntimeASan::FormatDescription(StructuredData::ObjectSP report) {
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std::string description = std::string(report->GetAsDictionary()
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->GetValueForKey("description")
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->GetAsString()
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->GetValue());
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return llvm::StringSwitch<std::string>(description)
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.Case("heap-use-after-free", "Use of deallocated memory")
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.Case("heap-buffer-overflow", "Heap buffer overflow")
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.Case("stack-buffer-underflow", "Stack buffer underflow")
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.Case("initialization-order-fiasco", "Initialization order problem")
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.Case("stack-buffer-overflow", "Stack buffer overflow")
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.Case("stack-use-after-return", "Use of stack memory after return")
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.Case("use-after-poison", "Use of poisoned memory")
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.Case("container-overflow", "Container overflow")
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.Case("stack-use-after-scope", "Use of out-of-scope stack memory")
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.Case("global-buffer-overflow", "Global buffer overflow")
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.Case("unknown-crash", "Invalid memory access")
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.Case("stack-overflow", "Stack space exhausted")
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.Case("null-deref", "Dereference of null pointer")
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.Case("wild-jump", "Jump to non-executable address")
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.Case("wild-addr-write", "Write through wild pointer")
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.Case("wild-addr-read", "Read from wild pointer")
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.Case("wild-addr", "Access through wild pointer")
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.Case("signal", "Deadly signal")
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.Case("double-free", "Deallocation of freed memory")
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.Case("new-delete-type-mismatch",
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"Deallocation size different from allocation size")
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.Case("bad-free", "Deallocation of non-allocated memory")
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.Case("alloc-dealloc-mismatch",
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"Mismatch between allocation and deallocation APIs")
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.Case("bad-malloc_usable_size", "Invalid argument to malloc_usable_size")
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.Case("bad-__sanitizer_get_allocated_size",
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"Invalid argument to __sanitizer_get_allocated_size")
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.Case("param-overlap",
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"Call to function disallowing overlapping memory ranges")
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.Case("negative-size-param", "Negative size used when accessing memory")
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.Case("bad-__sanitizer_annotate_contiguous_container",
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"Invalid argument to __sanitizer_annotate_contiguous_container")
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.Case("odr-violation", "Symbol defined in multiple translation units")
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.Case(
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"invalid-pointer-pair",
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"Comparison or arithmetic on pointers from different memory regions")
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// for unknown report codes just show the code
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.Default("AddressSanitizer detected: " + description);
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}
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bool InstrumentationRuntimeASan::NotifyBreakpointHit(
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void *baton, StoppointCallbackContext *context, user_id_t break_id,
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user_id_t break_loc_id) {
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assert(baton && "null baton");
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if (!baton)
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return false;
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InstrumentationRuntimeASan *const instance =
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static_cast<InstrumentationRuntimeASan *>(baton);
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ProcessSP process_sp = instance->GetProcessSP();
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if (process_sp->GetModIDRef().IsLastResumeForUserExpression())
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return false;
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StructuredData::ObjectSP report = instance->RetrieveReportData();
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std::string description;
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if (report) {
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description = instance->FormatDescription(report);
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}
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// Make sure this is the right process
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if (process_sp && process_sp == context->exe_ctx_ref.GetProcessSP()) {
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ThreadSP thread_sp = context->exe_ctx_ref.GetThreadSP();
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if (thread_sp)
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thread_sp->SetStopInfo(InstrumentationRuntimeStopInfo::
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CreateStopReasonWithInstrumentationData(
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*thread_sp, description, report));
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StreamFileSP stream_sp(
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process_sp->GetTarget().GetDebugger().GetOutputStreamSP());
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if (stream_sp) {
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stream_sp->Printf("AddressSanitizer report breakpoint hit. Use 'thread "
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"info -s' to get extended information about the "
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"report.\n");
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}
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return true; // Return true to stop the target
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} else
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return false; // Let target run
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}
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void InstrumentationRuntimeASan::Activate() {
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if (IsActive())
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return;
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ProcessSP process_sp = GetProcessSP();
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if (!process_sp)
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return;
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ConstString symbol_name("__asan::AsanDie()");
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const Symbol *symbol = GetRuntimeModuleSP()->FindFirstSymbolWithNameAndType(
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symbol_name, eSymbolTypeCode);
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if (symbol == nullptr)
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return;
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if (!symbol->ValueIsAddress() || !symbol->GetAddressRef().IsValid())
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return;
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Target &target = process_sp->GetTarget();
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addr_t symbol_address = symbol->GetAddressRef().GetOpcodeLoadAddress(&target);
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if (symbol_address == LLDB_INVALID_ADDRESS)
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return;
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bool internal = true;
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bool hardware = false;
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Breakpoint *breakpoint =
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process_sp->GetTarget()
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.CreateBreakpoint(symbol_address, internal, hardware)
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.get();
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breakpoint->SetCallback(InstrumentationRuntimeASan::NotifyBreakpointHit, this,
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true);
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breakpoint->SetBreakpointKind("address-sanitizer-report");
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SetBreakpointID(breakpoint->GetID());
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SetActive(true);
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}
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void InstrumentationRuntimeASan::Deactivate() {
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if (GetBreakpointID() != LLDB_INVALID_BREAK_ID) {
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ProcessSP process_sp = GetProcessSP();
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if (process_sp) {
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process_sp->GetTarget().RemoveBreakpointByID(GetBreakpointID());
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SetBreakpointID(LLDB_INVALID_BREAK_ID);
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}
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}
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SetActive(false);
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}
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