| //===-- asan_flags.cpp ------------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 *MaybeUseAsanDefaultOptionsCompileDefinition() { |
| #ifdef ASAN_DEFAULT_OPTIONS |
| return SANITIZER_STRINGIFY(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 = 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 |
| |
| if (SANITIZER_MAC) { |
| // Support macOS MallocScribble and MallocPreScribble: |
| // <https://developer.apple.com/library/content/documentation/Performance/ |
| // Conceptual/ManagingMemory/Articles/MallocDebug.html> |
| if (GetEnv("MallocScribble")) { |
| f->max_free_fill_size = 0x1000; |
| } |
| if (GetEnv("MallocPreScribble")) { |
| f->malloc_fill_byte = 0xaa; |
| } |
| } |
| |
| // 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 = __asan_default_options(); |
| asan_parser.ParseString(asan_default_options); |
| #if CAN_SANITIZE_UB |
| const char *ubsan_default_options = __ubsan_default_options(); |
| ubsan_parser.ParseString(ubsan_default_options); |
| #endif |
| #if CAN_SANITIZE_LEAKS |
| const char *lsan_default_options = __lsan_default_options(); |
| lsan_parser.ParseString(lsan_default_options); |
| #endif |
| |
| // Override from command line. |
| asan_parser.ParseStringFromEnv("ASAN_OPTIONS"); |
| #if CAN_SANITIZE_LEAKS |
| lsan_parser.ParseStringFromEnv("LSAN_OPTIONS"); |
| #endif |
| #if CAN_SANITIZE_UB |
| ubsan_parser.ParseStringFromEnv("UBSAN_OPTIONS"); |
| #endif |
| |
| InitializeCommonFlags(); |
| |
| // 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(); |
| } |
| // Ensure that redzone is at least SHADOW_GRANULARITY. |
| if (f->redzone < (int)SHADOW_GRANULARITY) |
| f->redzone = SHADOW_GRANULARITY; |
| // 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 << 4 : 1UL << 8; |
| f->quarantine_size_mb = kDefaultQuarantineSizeMb; |
| } |
| if (f->thread_local_quarantine_size_kb < 0) { |
| const u32 kDefaultThreadLocalQuarantineSizeKb = |
| // It is not advised to go lower than 64Kb, otherwise quarantine batches |
| // pushed from thread local quarantine to global one will create too |
| // much overhead. One quarantine batch size is 8Kb and it holds up to |
| // 1021 chunk, which amounts to 1/8 memory overhead per batch when |
| // thread local quarantine is set to 64Kb. |
| (ASAN_LOW_MEMORY) ? 1 << 6 : FIRST_32_SECOND_64(1 << 8, 1 << 10); |
| f->thread_local_quarantine_size_kb = kDefaultThreadLocalQuarantineSizeKb; |
| } |
| if (f->thread_local_quarantine_size_kb == 0 && f->quarantine_size_mb > 0) { |
| Report("%s: thread_local_quarantine_size_kb can be set to 0 only when " |
| "quarantine_size_mb is set to 0\n", SanitizerToolName); |
| Die(); |
| } |
| if (!f->replace_str && common_flags()->intercept_strlen) { |
| Report("WARNING: strlen interceptor is enabled even though replace_str=0. " |
| "Use intercept_strlen=0 to disable it."); |
| } |
| if (!f->replace_str && common_flags()->intercept_strchr) { |
| Report("WARNING: strchr* interceptors are enabled even though " |
| "replace_str=0. Use intercept_strchr=0 to disable them."); |
| } |
| if (!f->replace_str && common_flags()->intercept_strndup) { |
| Report("WARNING: strndup* interceptors are enabled even though " |
| "replace_str=0. Use intercept_strndup=0 to disable them."); |
| } |
| } |
| |
| } // namespace __asan |
| |
| SANITIZER_INTERFACE_WEAK_DEF(const char*, __asan_default_options, void) { |
| return ""; |
| } |