lib/asan/asan_flags.h

   1 //===-- asan_flags.h -------------------------------------------*- 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 runtime flags.
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef ASAN_FLAGS_H
  16 #define ASAN_FLAGS_H
  17
  18 #include "sanitizer_common/sanitizer_internal_defs.h"
  19
  20 // ASan flag values can be defined in four ways:
  21 // 1) initialized with default values at startup.
  22 // 2) overriden during compilation of ASan runtime by providing
  23 //    compile definition ASAN_DEFAULT_OPTIONS.
  24 // 3) overriden from string returned by user-specified function
  25 //    __asan_default_options().
  26 // 4) overriden from env variable ASAN_OPTIONS.
  27
  28 namespace __asan {
  29
  30 struct Flags {
  31   // Size (in bytes) of quarantine used to detect use-after-free errors.
  32   // Lower value may reduce memory usage but increase the chance of
  33   // false negatives.
  34   int  quarantine_size;
  35   // Size (in bytes) of redzones around heap objects.
  36   // Requirement: redzone >= 32, is a power of two.
  37   int  redzone;
  38   // If set, prints some debugging information and does additional checks.
  39   bool debug;
  40   // Controls the way to handle globals (0 - don't detect buffer overflow
  41   // on globals, 1 - detect buffer overflow, 2 - print data about registered
  42   // globals).
  43   int  report_globals;
  44   // If set, attempts to catch initialization order issues.
  45   bool check_initialization_order;
  46   // If set, uses custom wrappers and replacements for libc string functions
  47   // to find more errors.
  48   bool replace_str;
  49   // If set, uses custom wrappers for memset/memcpy/memmove intinsics.
  50   bool replace_intrin;
  51   // Used on Mac only.
  52   bool mac_ignore_invalid_free;
  53   // Enables stack-use-after-return checking at run-time.
  54   bool detect_stack_use_after_return;
  55   // The minimal fake stack size log.
  56   int uar_stack_size_log;
  57   // ASan allocator flag. max_malloc_fill_size is the maximal amount of bytes
  58   // that will be filled with malloc_fill_byte on malloc.
  59   int max_malloc_fill_size, malloc_fill_byte;
  60   // Override exit status if something was reported.
  61   int  exitcode;
  62   // If set, user may manually mark memory regions as poisoned or unpoisoned.
  63   bool allow_user_poisoning;
  64   // Number of seconds to sleep between printing an error report and
  65   // terminating application. Useful for debug purposes (when one needs
  66   // to attach gdb, for example).
  67   int  sleep_before_dying;
  68   // If set, registers ASan custom segv handler.
  69   bool handle_segv;
  70   // If set, allows user register segv handler even if ASan registers one.
  71   bool allow_user_segv_handler;
  72   // If set, uses alternate stack for signal handling.
  73   bool use_sigaltstack;
  74   // Allow the users to work around the bug in Nvidia drivers prior to 295.*.
  75   bool check_malloc_usable_size;
  76   // If set, explicitly unmaps (huge) shadow at exit.
  77   bool unmap_shadow_on_exit;
  78   // If set, calls abort() instead of _exit() after printing an error report.
  79   bool abort_on_error;
  80   // Print various statistics after printing an error message or if atexit=1.
  81   bool print_stats;
  82   // Print the legend for the shadow bytes.
  83   bool print_legend;
  84   // If set, prints ASan exit stats even after program terminates successfully.
  85   bool atexit;
  86   // By default, disable core dumper on 64-bit - it makes little sense
  87   // to dump 16T+ core.
  88   bool disable_core;
  89   // Allow the tool to re-exec the program. This may interfere badly with the
  90   // debugger.
  91   bool allow_reexec;
  92   // If set, prints not only thread creation stacks for threads in error report,
  93   // but also thread creation stacks for threads that created those threads,
  94   // etc. up to main thread.
  95   bool print_full_thread_history;
  96   // Poison (or not) the heap memory on [de]allocation. Zero value is useful
  97   // for benchmarking the allocator or instrumentator.
  98   bool poison_heap;
  99   // Report errors on malloc/delete, new/free, new/delete[], etc.
 100   bool alloc_dealloc_mismatch;
 101   // Use stack depot instead of storing stacks in the redzones.
 102   bool use_stack_depot;
 103   // If true, assume that memcmp(p1, p2, n) always reads n bytes before
 104   // comparing p1 and p2.
 105   bool strict_memcmp;
 106   // If true, assume that dynamic initializers can never access globals from
 107   // other modules, even if the latter are already initialized.
 108   bool strict_init_order;
 109 };
 110
 111 extern Flags asan_flags_dont_use_directly;
 112 inline Flags *flags() {
 113   return &asan_flags_dont_use_directly;
 114 }
 115 void InitializeFlags(Flags *f, const char *env);
 116
 117 }  // namespace __asan
 118
 119 #endif  // ASAN_FLAGS_H