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