211 lines
7.2 KiB
C++
211 lines
7.2 KiB
C++
//===-- 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));
|
|
if (SANITIZER_RTEMS) {
|
|
CHECK(!f->unmap_shadow_on_exit);
|
|
CHECK(!f->protect_shadow_gap);
|
|
}
|
|
|
|
// 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 "";
|
|
}
|