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

sandbox/linux/seccomp-bpf-helpers/syscall_sets.cc

 // Copyright (c) 2013 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.
 
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
 
 #include "build/build_config.h"
 #include "sandbox/linux/services/linux_syscalls.h"
 
 namespace sandbox {
@@ skipping 281 matching lines @@
     case __NR_sigaction:
     case __NR_sigprocmask:
     case __NR_sigreturn:
 #endif
       return true;
     case __NR_rt_sigpending:
     case __NR_rt_sigqueueinfo:
     case __NR_rt_sigsuspend:
     case __NR_rt_sigtimedwait:
     case __NR_rt_tgsigqueueinfo:
-    case __NR_sigaltstack:

[jln (very slow on Chromium), 2014/04/30 16:05:08]

FYI you should dnot have removed this, the syscall sets must form a partition of
all the syscalls. I'll fix it.

     case __NR_signalfd:
     case __NR_signalfd4:
 #if defined(__i386__) || defined(__arm__)
     case __NR_sigpending:
     case __NR_sigsuspend:
 #endif
 #if defined(__i386__)
     case __NR_signal:
     case __NR_sgetmask:  // Obsolete.
     case __NR_ssetmask:
@@ skipping 658 matching lines @@
     case __ARM_NR_usr26:
     case __ARM_NR_usr32:
       return true;
     default:
       return false;
   }
 }
 #endif  // defined(__arm__)
 
 }  // namespace sandbox.