base/debug/sanitizer_options.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This file contains the default options for various compiler-based dynamic
   6 // tools.
   7
   8 #include "build/build_config.h"
   9
  10 // Functions returning default options are declared weak in the tools' runtime
  11 // libraries. To make the linker pick the strong replacements for those
  12 // functions from this module, we explicitly force its inclusion by passing
  13 // -Wl,-u_sanitizer_options_link_helper
  14 extern "C"
  15 void _sanitizer_options_link_helper() { }
  16
  17 #if defined(ADDRESS_SANITIZER)
  18 // Default options for AddressSanitizer in various configurations:
  19 //   strict_memcmp=1 - disable the strict memcmp() checking
  20 //     (http://crbug.com/178677 and http://crbug.com/178404).
  21 //   malloc_context_size=5 - limit the size of stack traces collected by ASan
  22 //     for each malloc/free by 5 frames. These stack traces tend to accumulate
  23 //     very fast in applications using JIT (v8 in Chrome's case), see
  24 //     https://code.google.com/p/address-sanitizer/issues/detail?id=177
  25 //   symbolize=false - disable the in-process symbolization, which isn't 100%
  26 //     compatible with the existing sandboxes and doesn't make much sense for
  27 //     stripped official binaries.
  28 //   legacy_pthread_cond=1 - run in the libpthread 2.2.5 compatibility mode to
  29 //     work around libGL.so using the obsolete API, see
  30 //     http://crbug.com/341805. This may break if pthread_cond_t objects are
  31 //     accessed by both instrumented and non-instrumented binaries (e.g. if
  32 //     they reside in shared memory). This option is going to be deprecated in
  33 //     upstream AddressSanitizer and must not be used anywhere except the
  34 //     official builds.
  35 //   replace_intrin=0 - do not intercept memcpy(), memmove() and memset() to
  36 //     work around http://crbug.com/162461 (ASan report in OpenCL on Mac).
  37 //   check_printf=1 - check the memory accesses to printf (and other formatted
  38 //     output routines) arguments.
  39 //   use_sigaltstack=1 - handle signals on an alternate signal stack. Useful
  40 //     for stack overflow detection.
  41 #if defined(OS_LINUX)
  42 #if defined(GOOGLE_CHROME_BUILD)
  43 // Default AddressSanitizer options for the official build. These do not affect
  44 // tests on buildbots (which don't set GOOGLE_CHROME_BUILD) or non-official
  45 // Chromium builds.
  46 const char kAsanDefaultOptions[] =
  47     "legacy_pthread_cond=1 malloc_context_size=5 strict_memcmp=0 "
  48     "symbolize=false check_printf=1 use_sigaltstack=1 detect_leaks=0";
  49 #else
  50 // Default AddressSanitizer options for buildbots and non-official builds.
  51 const char *kAsanDefaultOptions =
  52     "strict_memcmp=0 symbolize=false check_printf=1 use_sigaltstack=1 "
  53     "detect_leaks=0";
  54 #endif  // GOOGLE_CHROME_BUILD
  55
  56 #elif defined(OS_MACOSX)
  57 const char *kAsanDefaultOptions =
  58     "strict_memcmp=0 replace_intrin=0 check_printf=1 use_sigaltstack=1";
  59 #endif  // OS_LINUX
  60
  61 #if defined(OS_LINUX) || defined(OS_MACOSX)
  62 extern "C"
  63 __attribute__((no_sanitize_address))
  64 __attribute__((visibility("default")))
  65 // The function isn't referenced from the executable itself. Make sure it isn't
  66 // stripped by the linker.
  67 __attribute__((used))
  68 const char *__asan_default_options() {
  69   return kAsanDefaultOptions;
  70 }
  71 #endif  // OS_LINUX || OS_MACOSX
  72 #endif  // ADDRESS_SANITIZER