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//===-- 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
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