1//=-- lsan.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// This file is a part of LeakSanitizer.
10// Standalone LSan RTL.
11//
12//===----------------------------------------------------------------------===//
13
14#include "lsan.h"
15
16#include "lsan_allocator.h"
17#include "lsan_common.h"
18#include "lsan_thread.h"
19#include "sanitizer_common/sanitizer_flag_parser.h"
20#include "sanitizer_common/sanitizer_flags.h"
21#include "sanitizer_common/sanitizer_interface_internal.h"
22
23bool lsan_inited;
24bool lsan_init_is_running;
25
26namespace __lsan {
27
28///// Interface to the common LSan module. /////
29bool WordIsPoisoned(uptr addr) {
30 return false;
31}
32
33} // namespace __lsan
34
35void __sanitizer::BufferedStackTrace::UnwindImpl(
36 uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
37 using namespace __lsan;
38 uptr stack_top = 0, stack_bottom = 0;
39 if (ThreadContextLsanBase *t = GetCurrentThread()) {
40 stack_top = t->stack_end();
41 stack_bottom = t->stack_begin();
42 }
43 if (SANITIZER_MIPS && !IsValidFrame(frame: bp, stack_top, stack_bottom))
44 return;
45 bool fast = StackTrace::WillUseFastUnwind(request_fast_unwind: request_fast);
46 Unwind(max_depth, pc, bp, context, stack_top, stack_bottom, request_fast_unwind: fast);
47}
48
49using namespace __lsan;
50
51static void InitializeFlags() {
52 // Set all the default values.
53 SetCommonFlagsDefaults();
54 {
55 CommonFlags cf;
56 cf.CopyFrom(other: *common_flags());
57 cf.external_symbolizer_path = GetEnv(name: "LSAN_SYMBOLIZER_PATH");
58 cf.malloc_context_size = 30;
59 cf.intercept_tls_get_addr = true;
60 cf.detect_leaks = true;
61 cf.exitcode = 23;
62 OverrideCommonFlags(cf);
63 }
64
65 Flags *f = flags();
66 f->SetDefaults();
67
68 FlagParser parser;
69 RegisterLsanFlags(parser: &parser, f);
70 RegisterCommonFlags(parser: &parser);
71
72 // Override from user-specified string.
73 const char *lsan_default_options = __lsan_default_options();
74 parser.ParseString(s: lsan_default_options);
75 parser.ParseStringFromEnv(env_name: "LSAN_OPTIONS");
76
77 InitializeCommonFlags();
78
79 if (Verbosity()) ReportUnrecognizedFlags();
80
81 if (common_flags()->help) parser.PrintFlagDescriptions();
82
83 __sanitizer_set_report_path(path: common_flags()->log_path);
84}
85
86extern "C" void __lsan_init() {
87 CHECK(!lsan_init_is_running);
88 if (lsan_inited)
89 return;
90 lsan_init_is_running = true;
91 SanitizerToolName = "LeakSanitizer";
92 CacheBinaryName();
93 AvoidCVE_2016_2143();
94 InitializeFlags();
95 InitializePlatformEarly();
96 InitCommonLsan();
97 InitializeAllocator();
98 ReplaceSystemMalloc();
99 InitializeInterceptors();
100 InitializeThreads();
101 InstallDeadlySignalHandlers(handler: LsanOnDeadlySignal);
102 InitializeMainThread();
103 InstallAtExitCheckLeaks();
104 InstallAtForkHandler();
105
106 InitializeCoverage(enabled: common_flags()->coverage, coverage_dir: common_flags()->coverage_dir);
107
108 lsan_inited = true;
109 lsan_init_is_running = false;
110}
111
112extern "C" SANITIZER_INTERFACE_ATTRIBUTE
113void __sanitizer_print_stack_trace() {
114 GET_STACK_TRACE_FATAL;
115 stack.Print();
116}
117