1 //===-- InstrumentationRuntimeASan.cpp ------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "InstrumentationRuntimeASan.h"
10
11 #include "lldb/Breakpoint/StoppointCallbackContext.h"
12 #include "lldb/Core/Module.h"
13 #include "lldb/Core/PluginInterface.h"
14 #include "lldb/Core/PluginManager.h"
15 #include "lldb/Symbol/Symbol.h"
16 #include "lldb/Target/Process.h"
17 #include "lldb/Utility/RegularExpression.h"
18
19 #include "Plugins/InstrumentationRuntime/Utility/ReportRetriever.h"
20
21 using namespace lldb;
22 using namespace lldb_private;
23
LLDB_PLUGIN_DEFINE(InstrumentationRuntimeASan)24 LLDB_PLUGIN_DEFINE(InstrumentationRuntimeASan)
25
26 lldb::InstrumentationRuntimeSP
27 InstrumentationRuntimeASan::CreateInstance(const lldb::ProcessSP &process_sp) {
28 return InstrumentationRuntimeSP(new InstrumentationRuntimeASan(process_sp));
29 }
30
Initialize()31 void InstrumentationRuntimeASan::Initialize() {
32 PluginManager::RegisterPlugin(
33 GetPluginNameStatic(), "AddressSanitizer instrumentation runtime plugin.",
34 CreateInstance, GetTypeStatic);
35 }
36
Terminate()37 void InstrumentationRuntimeASan::Terminate() {
38 PluginManager::UnregisterPlugin(CreateInstance);
39 }
40
GetTypeStatic()41 lldb::InstrumentationRuntimeType InstrumentationRuntimeASan::GetTypeStatic() {
42 return eInstrumentationRuntimeTypeAddressSanitizer;
43 }
44
~InstrumentationRuntimeASan()45 InstrumentationRuntimeASan::~InstrumentationRuntimeASan() { Deactivate(); }
46
47 const RegularExpression &
GetPatternForRuntimeLibrary()48 InstrumentationRuntimeASan::GetPatternForRuntimeLibrary() {
49 // FIXME: This shouldn't include the "dylib" suffix.
50 static RegularExpression regex(
51 llvm::StringRef("libclang_rt.asan_(.*)_dynamic\\.dylib"));
52 return regex;
53 }
54
CheckIfRuntimeIsValid(const lldb::ModuleSP module_sp)55 bool InstrumentationRuntimeASan::CheckIfRuntimeIsValid(
56 const lldb::ModuleSP module_sp) {
57 const Symbol *symbol = module_sp->FindFirstSymbolWithNameAndType(
58 ConstString("__asan_get_alloc_stack"), lldb::eSymbolTypeAny);
59
60 return symbol != nullptr;
61 }
62
NotifyBreakpointHit(void * baton,StoppointCallbackContext * context,user_id_t break_id,user_id_t break_loc_id)63 bool InstrumentationRuntimeASan::NotifyBreakpointHit(
64 void *baton, StoppointCallbackContext *context, user_id_t break_id,
65 user_id_t break_loc_id) {
66 assert(baton && "null baton");
67 if (!baton)
68 return false;
69
70 InstrumentationRuntimeASan *const instance =
71 static_cast<InstrumentationRuntimeASan *>(baton);
72
73 ProcessSP process_sp = instance->GetProcessSP();
74
75 return ReportRetriever::NotifyBreakpointHit(process_sp, context, break_id,
76 break_loc_id);
77 }
78
Activate()79 void InstrumentationRuntimeASan::Activate() {
80 if (IsActive())
81 return;
82
83 ProcessSP process_sp = GetProcessSP();
84 if (!process_sp)
85 return;
86
87 Breakpoint *breakpoint = ReportRetriever::SetupBreakpoint(
88 GetRuntimeModuleSP(), process_sp, ConstString("_ZN6__asanL7AsanDieEv"));
89
90 if (!breakpoint)
91 return;
92
93 const bool sync = false;
94
95 breakpoint->SetCallback(InstrumentationRuntimeASan::NotifyBreakpointHit, this,
96 sync);
97 breakpoint->SetBreakpointKind("address-sanitizer-report");
98 SetBreakpointID(breakpoint->GetID());
99
100 SetActive(true);
101 }
102
Deactivate()103 void InstrumentationRuntimeASan::Deactivate() {
104 SetActive(false);
105
106 if (GetBreakpointID() == LLDB_INVALID_BREAK_ID)
107 return;
108
109 if (ProcessSP process_sp = GetProcessSP()) {
110 process_sp->GetTarget().RemoveBreakpointByID(GetBreakpointID());
111 SetBreakpointID(LLDB_INVALID_BREAK_ID);
112 }
113 }
114