Enable use_sigaltstack=1 for ASan builds. This will ease the stack overflow detection.

base/debug/sanitizer_options.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the default options for various compiler-based dynamic
 // tools.
 
 #include "build/build_config.h"
 
 // Functions returning default options are declared weak in the tools' runtime
@@ skipping 18 matching lines @@
 //     work around libGL.so using the obsolete API, see
 //     http://crbug.com/341805. This may break if pthread_cond_t objects are
 //     accessed by both instrumented and non-instrumented binaries (e.g. if
 //     they reside in shared memory). This option is going to be deprecated in
 //     upstream AddressSanitizer and must not be used anywhere except the
 //     official builds.
 //   replace_intrin=0 - do not intercept memcpy(), memmove() and memset() to
 //     work around http://crbug.com/162461 (ASan report in OpenCL on Mac).
 //   check_printf=1 - check the memory accesses to printf (and other formatted
 //     output routines) arguments.
+//   use_sigaltstack=1 - handle signals on an alternate signal stack. Useful

[Nico, 2014/04/30 15:23:39]

Typo use_sigalstack (missing n)

…oh, below too, so I suppose use_sigaltstack is the correct name. That seems
like an unfortunate name, as it looks like a typo for use_signalstack which
means the same thing and doesn't look like a typo :-/

[Alexander Potapenko, 2014/04/30 16:08:15]

That's named after the sigaltstack() function :)

+//     for stack overflow detection.
 #if defined(OS_LINUX)
 #if defined(GOOGLE_CHROME_BUILD)
 // Default AddressSanitizer options for the official build. These do not affect
 // tests on buildbots (which don't set GOOGLE_CHROME_BUILD) or non-official
 // Chromium builds.
 const char kAsanDefaultOptions[] =
     "legacy_pthread_cond=1 malloc_context_size=5 strict_memcmp=0 "
-    "symbolize=false check_printf=1";
+    "symbolize=false check_printf=1 use_sigaltstack=1";
 #else
 // Default AddressSanitizer options for buildbots and non-official builds.
 const char *kAsanDefaultOptions =
-    "strict_memcmp=0 symbolize=false check_printf=1";
+    "strict_memcmp=0 symbolize=false check_printf=1 use_sigaltstack=1";
 #endif  // GOOGLE_CHROME_BUILD
 
 #elif defined(OS_MACOSX)
 const char *kAsanDefaultOptions =
-    "strict_memcmp=0 replace_intrin=0 check_printf=1";
+    "strict_memcmp=0 replace_intrin=0 check_printf=1 use_sigaltstack=1";
 #endif  // OS_LINUX
 
 #if defined(OS_LINUX) || defined(OS_MACOSX)
 extern "C"
 __attribute__((no_sanitize_address))
 const char *__asan_default_options() {
   return kAsanDefaultOptions;
 }
 #endif  // OS_LINUX || OS_MACOSX
 #endif  // ADDRESS_SANITIZER