src/compiler-rt/lib/asan/asan_flags.cc

   1 //===-- asan_flags.cc -------------------------------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of AddressSanitizer, an address sanity checker.
  11 //
  12 // ASan flag parsing logic.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "asan_activation.h"
  16 #include "asan_flags.h"
  17 #include "asan_interface_internal.h"
  18 #include "asan_stack.h"
  19 #include "lsan/lsan_common.h"
  20 #include "sanitizer_common/sanitizer_common.h"
  21 #include "sanitizer_common/sanitizer_flags.h"
  22 #include "sanitizer_common/sanitizer_flag_parser.h"
  23 #include "ubsan/ubsan_flags.h"
  24 #include "ubsan/ubsan_platform.h"
  25
  26 namespace __asan {
  27
  28 Flags asan_flags_dont_use_directly;  // use via flags().
  29
  30 static const char *MaybeCallAsanDefaultOptions() {
  31   return (&__asan_default_options) ? __asan_default_options() : "";
  32 }
  33
  34 static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
  35 #ifdef ASAN_DEFAULT_OPTIONS
  36 // Stringize the macro value.
  37 # define ASAN_STRINGIZE(x) #x
  38 # define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
  39   return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
  40 #else
  41   return "";
  42 #endif
  43 }
  44
  45 void Flags::SetDefaults() {
  46 #define ASAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
  47 #include "asan_flags.inc"
  48 #undef ASAN_FLAG
  49 }
  50
  51 static void RegisterAsanFlags(FlagParser *parser, Flags *f) {
  52 #define ASAN_FLAG(Type, Name, DefaultValue, Description) \
  53   RegisterFlag(parser, #Name, Description, &f->Name);
  54 #include "asan_flags.inc"
  55 #undef ASAN_FLAG
  56 }
  57
  58 void InitializeFlags() {
  59   // Set the default values and prepare for parsing ASan and common flags.
  60   SetCommonFlagsDefaults();
  61   {
  62     CommonFlags cf;
  63     cf.CopyFrom(*common_flags());
  64     cf.detect_leaks = CAN_SANITIZE_LEAKS;
  65     cf.external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
  66     cf.malloc_context_size = kDefaultMallocContextSize;
  67     cf.intercept_tls_get_addr = true;
  68     cf.exitcode = 1;
  69     OverrideCommonFlags(cf);
  70   }
  71   Flags *f = flags();
  72   f->SetDefaults();
  73
  74   FlagParser asan_parser;
  75   RegisterAsanFlags(&asan_parser, f);
  76   RegisterCommonFlags(&asan_parser);
  77
  78   // Set the default values and prepare for parsing LSan and UBSan flags
  79   // (which can also overwrite common flags).
  80 #if CAN_SANITIZE_LEAKS
  81   __lsan::Flags *lf = __lsan::flags();
  82   lf->SetDefaults();
  83
  84   FlagParser lsan_parser;
  85   __lsan::RegisterLsanFlags(&lsan_parser, lf);
  86   RegisterCommonFlags(&lsan_parser);
  87 #endif
  88
  89 #if CAN_SANITIZE_UB
  90   __ubsan::Flags *uf = __ubsan::flags();
  91   uf->SetDefaults();
  92
  93   FlagParser ubsan_parser;
  94   __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
  95   RegisterCommonFlags(&ubsan_parser);
  96 #endif
  97
  98   // Override from ASan compile definition.
  99   const char *asan_compile_def = MaybeUseAsanDefaultOptionsCompileDefinition();
 100   asan_parser.ParseString(asan_compile_def);
 101
 102   // Override from user-specified string.
 103   const char *asan_default_options = MaybeCallAsanDefaultOptions();
 104   asan_parser.ParseString(asan_default_options);
 105 #if CAN_SANITIZE_UB
 106   const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
 107   ubsan_parser.ParseString(ubsan_default_options);
 108 #endif
 109
 110   // Override from command line.
 111   asan_parser.ParseString(GetEnv("ASAN_OPTIONS"));
 112 #if CAN_SANITIZE_LEAKS
 113   lsan_parser.ParseString(GetEnv("LSAN_OPTIONS"));
 114 #endif
 115 #if CAN_SANITIZE_UB
 116   ubsan_parser.ParseString(GetEnv("UBSAN_OPTIONS"));
 117 #endif
 118
 119   // Let activation flags override current settings. On Android they come
 120   // from a system property. On other platforms this is no-op.
 121   if (!flags()->start_deactivated) {
 122     char buf[100];
 123     GetExtraActivationFlags(buf, sizeof(buf));
 124     asan_parser.ParseString(buf);
 125   }
 126
 127   SetVerbosity(common_flags()->verbosity);
 128
 129   // TODO(eugenis): dump all flags at verbosity>=2?
 130   if (Verbosity()) ReportUnrecognizedFlags();
 131
 132   if (common_flags()->help) {
 133     // TODO(samsonov): print all of the flags (ASan, LSan, common).
 134     asan_parser.PrintFlagDescriptions();
 135   }
 136
 137   // Flag validation:
 138   if (!CAN_SANITIZE_LEAKS && common_flags()->detect_leaks) {
 139     Report("%s: detect_leaks is not supported on this platform.\n",
 140            SanitizerToolName);
 141     Die();
 142   }
 143   // Make "strict_init_order" imply "check_initialization_order".
 144   // TODO(samsonov): Use a single runtime flag for an init-order checker.
 145   if (f->strict_init_order) {
 146     f->check_initialization_order = true;
 147   }
 148   CHECK_LE((uptr)common_flags()->malloc_context_size, kStackTraceMax);
 149   CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
 150   CHECK_GE(f->redzone, 16);
 151   CHECK_GE(f->max_redzone, f->redzone);
 152   CHECK_LE(f->max_redzone, 2048);
 153   CHECK(IsPowerOfTwo(f->redzone));
 154   CHECK(IsPowerOfTwo(f->max_redzone));
 155
 156   // quarantine_size is deprecated but we still honor it.
 157   // quarantine_size can not be used together with quarantine_size_mb.
 158   if (f->quarantine_size >= 0 && f->quarantine_size_mb >= 0) {
 159     Report("%s: please use either 'quarantine_size' (deprecated) or "
 160            "quarantine_size_mb, but not both\n", SanitizerToolName);
 161     Die();
 162   }
 163   if (f->quarantine_size >= 0)
 164     f->quarantine_size_mb = f->quarantine_size >> 20;
 165   if (f->quarantine_size_mb < 0) {
 166     const int kDefaultQuarantineSizeMb =
 167         (ASAN_LOW_MEMORY) ? 1UL << 6 : 1UL << 8;
 168     f->quarantine_size_mb = kDefaultQuarantineSizeMb;
 169   }
 170 }
 171
 172 }  // namespace __asan
 173
 174 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
 175 extern "C" {
 176 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
 177 const char* __asan_default_options() { return ""; }
 178 }  // extern "C"
 179 #endif