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
MaybeCallAsanDefaultOptions()30 static const char *MaybeCallAsanDefaultOptions() {
31 return (&__asan_default_options) ? __asan_default_options() : "";
32 }
33
MaybeUseAsanDefaultOptionsCompileDefinition()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
SetDefaults()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
RegisterAsanFlags(FlagParser * parser,Flags * f)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
InitializeFlags()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 InitializeCommonFlags();
120
121 // TODO(eugenis): dump all flags at verbosity>=2?
122 if (Verbosity()) ReportUnrecognizedFlags();
123
124 if (common_flags()->help) {
125 // TODO(samsonov): print all of the flags (ASan, LSan, common).
126 asan_parser.PrintFlagDescriptions();
127 }
128
129 // Flag validation:
130 if (!CAN_SANITIZE_LEAKS && common_flags()->detect_leaks) {
131 Report("%s: detect_leaks is not supported on this platform.\n",
132 SanitizerToolName);
133 Die();
134 }
135 // Make "strict_init_order" imply "check_initialization_order".
136 // TODO(samsonov): Use a single runtime flag for an init-order checker.
137 if (f->strict_init_order) {
138 f->check_initialization_order = true;
139 }
140 CHECK_LE((uptr)common_flags()->malloc_context_size, kStackTraceMax);
141 CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
142 CHECK_GE(f->redzone, 16);
143 CHECK_GE(f->max_redzone, f->redzone);
144 CHECK_LE(f->max_redzone, 2048);
145 CHECK(IsPowerOfTwo(f->redzone));
146 CHECK(IsPowerOfTwo(f->max_redzone));
147
148 // quarantine_size is deprecated but we still honor it.
149 // quarantine_size can not be used together with quarantine_size_mb.
150 if (f->quarantine_size >= 0 && f->quarantine_size_mb >= 0) {
151 Report("%s: please use either 'quarantine_size' (deprecated) or "
152 "quarantine_size_mb, but not both\n", SanitizerToolName);
153 Die();
154 }
155 if (f->quarantine_size >= 0)
156 f->quarantine_size_mb = f->quarantine_size >> 20;
157 if (f->quarantine_size_mb < 0) {
158 const int kDefaultQuarantineSizeMb =
159 (ASAN_LOW_MEMORY) ? 1UL << 6 : 1UL << 8;
160 f->quarantine_size_mb = kDefaultQuarantineSizeMb;
161 }
162 if (!f->replace_str && common_flags()->intercept_strlen) {
163 Report("WARNING: strlen interceptor is enabled even though replace_str=0. "
164 "Use intercept_strlen=0 to disable it.");
165 }
166 if (!f->replace_str && common_flags()->intercept_strchr) {
167 Report("WARNING: strchr* interceptors are enabled even though "
168 "replace_str=0. Use intercept_strchr=0 to disable them.");
169 }
170 }
171
172 } // namespace __asan
173
174 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
175 extern "C" {
176 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
__asan_default_options()177 const char* __asan_default_options() { return ""; }
178 } // extern "C"
179 #endif
180