compiler-rt/lib/lsan/lsan.cpp

   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
  23 bool lsan_inited;
  24 bool lsan_init_is_running;
  25
  26 namespace __lsan {
  27
  28 ///// Interface to the common LSan module. /////
  29 bool WordIsPoisoned(uptr addr) {
  30   return false;
  31 }
  32
  33 }  // namespace __lsan
  34
  35 void __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 (ThreadContext *t = CurrentThreadContext()) {
  40     stack_top = t->stack_end();
  41     stack_bottom = t->stack_begin();
  42   }
  43   if (SANITIZER_MIPS && !IsValidFrame(bp, stack_top, stack_bottom))
  44     return;
  45   bool fast = StackTrace::WillUseFastUnwind(request_fast);
  46   Unwind(max_depth, pc, bp, context, stack_top, stack_bottom, fast);
  47 }
  48
  49 using namespace __lsan;
  50
  51 static void InitializeFlags() {
  52   // Set all the default values.
  53   SetCommonFlagsDefaults();
  54   {
  55     CommonFlags cf;
  56     cf.CopyFrom(*common_flags());
  57     cf.external_symbolizer_path = GetEnv("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, f);
  70   RegisterCommonFlags(&parser);
  71
  72   // Override from user-specified string.
  73   const char *lsan_default_options = __lsan_default_options();
  74   parser.ParseString(lsan_default_options);
  75   parser.ParseStringFromEnv("LSAN_OPTIONS");
  76
  77   InitializeCommonFlags();
  78
  79   if (Verbosity()) ReportUnrecognizedFlags();
  80
  81   if (common_flags()->help) parser.PrintFlagDescriptions();
  82
  83   __sanitizer_set_report_path(common_flags()->log_path);
  84 }
  85
  86 extern "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   InitCommonLsan();
  96   InitializeAllocator();
  97   ReplaceSystemMalloc();
  98   InitTlsSize();
  99   InitializeInterceptors();
 100   InitializeThreadRegistry();
 101   InstallDeadlySignalHandlers(LsanOnDeadlySignal);
 102   InitializeMainThread();
 103   InstallAtExitCheckLeaks();
 104
 105   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 106
 107   lsan_inited = true;
 108   lsan_init_is_running = false;
 109 }
 110
 111 extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 112 void __sanitizer_print_stack_trace() {
 113   GET_STACK_TRACE_FATAL;
 114   stack.Print();
 115 }