summaryrefslogtreecommitdiff
path: root/libsanitizer/asan/asan_flags.cc
blob: 9a68ad4eaa8e5887a56896a912d106f5eaac5e3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
//===-- asan_flags.cc -------------------------------------------*- C++ -*-===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// ASan flag parsing logic.
//===----------------------------------------------------------------------===//

#include "asan_activation.h"
#include "asan_flags.h"
#include "asan_interface_internal.h"
#include "asan_stack.h"
#include "lsan/lsan_common.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_flags.h"
#include "sanitizer_common/sanitizer_flag_parser.h"
#include "ubsan/ubsan_flags.h"
#include "ubsan/ubsan_platform.h"

namespace __asan {

Flags asan_flags_dont_use_directly;  // use via flags().

static const char *MaybeCallAsanDefaultOptions() {
  return (&__asan_default_options) ? __asan_default_options() : "";
}

static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
#ifdef ASAN_DEFAULT_OPTIONS
// Stringize the macro value.
# define ASAN_STRINGIZE(x) #x
# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
  return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
#else
  return "";
#endif
}

void Flags::SetDefaults() {
#define ASAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
#include "asan_flags.inc"
#undef ASAN_FLAG
}

static void RegisterAsanFlags(FlagParser *parser, Flags *f) {
#define ASAN_FLAG(Type, Name, DefaultValue, Description) \
  RegisterFlag(parser, #Name, Description, &f->Name);
#include "asan_flags.inc"
#undef ASAN_FLAG
}

void InitializeFlags() {
  // Set the default values and prepare for parsing ASan and common flags.
  SetCommonFlagsDefaults();
  {
    CommonFlags cf;
    cf.CopyFrom(*common_flags());
    cf.detect_leaks = CAN_SANITIZE_LEAKS;
    cf.external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
    cf.malloc_context_size = kDefaultMallocContextSize;
    cf.intercept_tls_get_addr = true;
    cf.exitcode = 1;
    OverrideCommonFlags(cf);
  }
  Flags *f = flags();
  f->SetDefaults();

  FlagParser asan_parser;
  RegisterAsanFlags(&asan_parser, f);
  RegisterCommonFlags(&asan_parser);

  // Set the default values and prepare for parsing LSan and UBSan flags
  // (which can also overwrite common flags).
#if CAN_SANITIZE_LEAKS
  __lsan::Flags *lf = __lsan::flags();
  lf->SetDefaults();

  FlagParser lsan_parser;
  __lsan::RegisterLsanFlags(&lsan_parser, lf);
  RegisterCommonFlags(&lsan_parser);
#endif

#if CAN_SANITIZE_UB
  __ubsan::Flags *uf = __ubsan::flags();
  uf->SetDefaults();

  FlagParser ubsan_parser;
  __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
  RegisterCommonFlags(&ubsan_parser);
#endif

  // Override from ASan compile definition.
  const char *asan_compile_def = MaybeUseAsanDefaultOptionsCompileDefinition();
  asan_parser.ParseString(asan_compile_def);

  // Override from user-specified string.
  const char *asan_default_options = MaybeCallAsanDefaultOptions();
  asan_parser.ParseString(asan_default_options);
#if CAN_SANITIZE_UB
  const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
  ubsan_parser.ParseString(ubsan_default_options);
#endif

  // Override from command line.
  asan_parser.ParseString(GetEnv("ASAN_OPTIONS"));
#if CAN_SANITIZE_LEAKS
  lsan_parser.ParseString(GetEnv("LSAN_OPTIONS"));
#endif
#if CAN_SANITIZE_UB
  ubsan_parser.ParseString(GetEnv("UBSAN_OPTIONS"));
#endif

  // Let activation flags override current settings. On Android they come
  // from a system property. On other platforms this is no-op.
  if (!flags()->start_deactivated) {
    char buf[100];
    GetExtraActivationFlags(buf, sizeof(buf));
    asan_parser.ParseString(buf);
  }

  SetVerbosity(common_flags()->verbosity);

  // TODO(eugenis): dump all flags at verbosity>=2?
  if (Verbosity()) ReportUnrecognizedFlags();

  if (common_flags()->help) {
    // TODO(samsonov): print all of the flags (ASan, LSan, common).
    asan_parser.PrintFlagDescriptions();
  }

  // Flag validation:
  if (!CAN_SANITIZE_LEAKS && common_flags()->detect_leaks) {
    Report("%s: detect_leaks is not supported on this platform.\n",
           SanitizerToolName);
    Die();
  }
  // Make "strict_init_order" imply "check_initialization_order".
  // TODO(samsonov): Use a single runtime flag for an init-order checker.
  if (f->strict_init_order) {
    f->check_initialization_order = true;
  }
  CHECK_LE((uptr)common_flags()->malloc_context_size, kStackTraceMax);
  CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
  CHECK_GE(f->redzone, 16);
  CHECK_GE(f->max_redzone, f->redzone);
  CHECK_LE(f->max_redzone, 2048);
  CHECK(IsPowerOfTwo(f->redzone));
  CHECK(IsPowerOfTwo(f->max_redzone));

  // quarantine_size is deprecated but we still honor it.
  // quarantine_size can not be used together with quarantine_size_mb.
  if (f->quarantine_size >= 0 && f->quarantine_size_mb >= 0) {
    Report("%s: please use either 'quarantine_size' (deprecated) or "
           "quarantine_size_mb, but not both\n", SanitizerToolName);
    Die();
  }
  if (f->quarantine_size >= 0)
    f->quarantine_size_mb = f->quarantine_size >> 20;
  if (f->quarantine_size_mb < 0) {
    const int kDefaultQuarantineSizeMb =
        (ASAN_LOW_MEMORY) ? 1UL << 6 : 1UL << 8;
    f->quarantine_size_mb = kDefaultQuarantineSizeMb;
  }
}

}  // namespace __asan

#if !SANITIZER_SUPPORTS_WEAK_HOOKS
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
const char* __asan_default_options() { return ""; }
}  // extern "C"
#endif