Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 1 | //===-- asan_activation.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 activation/deactivation logic. |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #include "asan_activation.h" |
| 16 | #include "asan_allocator.h" |
| 17 | #include "asan_flags.h" |
| 18 | #include "asan_internal.h" |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 19 | #include "asan_poisoning.h" |
| 20 | #include "asan_stack.h" |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 21 | #include "sanitizer_common/sanitizer_flags.h" |
| 22 | |
| 23 | namespace __asan { |
| 24 | |
| 25 | static struct AsanDeactivatedFlags { |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 26 | AllocatorOptions allocator_options; |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 27 | int malloc_context_size; |
| 28 | bool poison_heap; |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 29 | bool coverage; |
| 30 | const char *coverage_dir; |
| 31 | |
| 32 | void RegisterActivationFlags(FlagParser *parser, Flags *f, CommonFlags *cf) { |
| 33 | #define ASAN_ACTIVATION_FLAG(Type, Name) \ |
| 34 | RegisterFlag(parser, #Name, "", &f->Name); |
| 35 | #define COMMON_ACTIVATION_FLAG(Type, Name) \ |
| 36 | RegisterFlag(parser, #Name, "", &cf->Name); |
| 37 | #include "asan_activation_flags.inc" |
| 38 | #undef ASAN_ACTIVATION_FLAG |
| 39 | #undef COMMON_ACTIVATION_FLAG |
| 40 | |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 41 | RegisterIncludeFlags(parser, cf); |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | void OverrideFromActivationFlags() { |
| 45 | Flags f; |
| 46 | CommonFlags cf; |
| 47 | FlagParser parser; |
| 48 | RegisterActivationFlags(&parser, &f, &cf); |
| 49 | |
| 50 | // Copy the current activation flags. |
| 51 | allocator_options.CopyTo(&f, &cf); |
| 52 | cf.malloc_context_size = malloc_context_size; |
| 53 | f.poison_heap = poison_heap; |
| 54 | cf.coverage = coverage; |
| 55 | cf.coverage_dir = coverage_dir; |
| 56 | cf.verbosity = Verbosity(); |
| 57 | cf.help = false; // this is activation-specific help |
| 58 | |
| 59 | // Check if activation flags need to be overriden. |
| 60 | if (const char *env = GetEnv("ASAN_ACTIVATION_OPTIONS")) { |
| 61 | parser.ParseString(env); |
| 62 | } |
| 63 | |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 64 | SetVerbosity(cf.verbosity); |
| 65 | |
| 66 | if (Verbosity()) ReportUnrecognizedFlags(); |
| 67 | |
| 68 | if (cf.help) parser.PrintFlagDescriptions(); |
| 69 | |
| 70 | allocator_options.SetFrom(&f, &cf); |
| 71 | malloc_context_size = cf.malloc_context_size; |
| 72 | poison_heap = f.poison_heap; |
| 73 | coverage = cf.coverage; |
| 74 | coverage_dir = cf.coverage_dir; |
| 75 | } |
| 76 | |
| 77 | void Print() { |
| 78 | Report( |
| 79 | "quarantine_size_mb %d, max_redzone %d, poison_heap %d, " |
| 80 | "malloc_context_size %d, alloc_dealloc_mismatch %d, " |
| 81 | "allocator_may_return_null %d, coverage %d, coverage_dir %s\n", |
| 82 | allocator_options.quarantine_size_mb, allocator_options.max_redzone, |
| 83 | poison_heap, malloc_context_size, |
| 84 | allocator_options.alloc_dealloc_mismatch, |
| 85 | allocator_options.may_return_null, coverage, coverage_dir); |
| 86 | } |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 87 | } asan_deactivated_flags; |
| 88 | |
| 89 | static bool asan_is_deactivated; |
| 90 | |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 91 | void AsanDeactivate() { |
| 92 | CHECK(!asan_is_deactivated); |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 93 | VReport(1, "Deactivating ASan\n"); |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 94 | |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 95 | // Stash runtime state. |
| 96 | GetAllocatorOptions(&asan_deactivated_flags.allocator_options); |
| 97 | asan_deactivated_flags.malloc_context_size = GetMallocContextSize(); |
| 98 | asan_deactivated_flags.poison_heap = CanPoisonMemory(); |
| 99 | asan_deactivated_flags.coverage = common_flags()->coverage; |
| 100 | asan_deactivated_flags.coverage_dir = common_flags()->coverage_dir; |
| 101 | |
| 102 | // Deactivate the runtime. |
| 103 | SetCanPoisonMemory(false); |
| 104 | SetMallocContextSize(1); |
| 105 | ReInitializeCoverage(false, nullptr); |
| 106 | |
| 107 | AllocatorOptions disabled = asan_deactivated_flags.allocator_options; |
| 108 | disabled.quarantine_size_mb = 0; |
| 109 | disabled.min_redzone = 16; // Redzone must be at least 16 bytes long. |
| 110 | disabled.max_redzone = 16; |
| 111 | disabled.alloc_dealloc_mismatch = false; |
| 112 | disabled.may_return_null = true; |
| 113 | ReInitializeAllocator(disabled); |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 114 | |
| 115 | asan_is_deactivated = true; |
| 116 | } |
| 117 | |
| 118 | void AsanActivate() { |
| 119 | if (!asan_is_deactivated) return; |
| 120 | VReport(1, "Activating ASan\n"); |
| 121 | |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 122 | UpdateProcessName(); |
| 123 | |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 124 | asan_deactivated_flags.OverrideFromActivationFlags(); |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 125 | |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 126 | SetCanPoisonMemory(asan_deactivated_flags.poison_heap); |
| 127 | SetMallocContextSize(asan_deactivated_flags.malloc_context_size); |
| 128 | ReInitializeCoverage(asan_deactivated_flags.coverage, |
| 129 | asan_deactivated_flags.coverage_dir); |
| 130 | ReInitializeAllocator(asan_deactivated_flags.allocator_options); |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 131 | |
| 132 | asan_is_deactivated = false; |
Stephen Hines | 86277eb | 2015-03-23 12:06:32 -0700 | [diff] [blame] | 133 | if (Verbosity()) { |
| 134 | Report("Activated with flags:\n"); |
| 135 | asan_deactivated_flags.Print(); |
| 136 | } |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | } // namespace __asan |