Redefine the ASan options for nacl_helper so that ASan does not handle SIGSEGV/SIGBUS

chrome/nacl/nacl_helper_linux.cc

 // Copyright (c) 2012 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.
 
 // A mini-zygote specifically for Native Client.
 
 #include "chrome/common/nacl_helper_linux.h"
 
 #include <errno.h>
 #include <link.h>
@@ skipping 180 matching lines @@
     char *endp;
     prereserved_sandbox_size =
         strtoul(reserved_at_zero_switch_value.c_str(), &endp, 0);
     if (*endp != '\0')
       LOG(ERROR) << "Could not parse reserved_at_zero argument value of "
                  << reserved_at_zero_switch_value;
   }
   return prereserved_sandbox_size;
 }
 
+#if defined(ADDRESS_SANITIZER)
+// Do not install the SIGSEGV handler in ASan. This should make the NaCl
+// platform qualification test pass.
+static const char kAsanDefaultOptionsNaCl[] = "handle_segv=0";
+
+// Override the default ASan options for the NaCl helper.
+// __asan_default_options should not be instrumented, because it is called
+// before ASan is initialized.
+extern "C"
+__attribute__((no_address_safety_analysis))
+const char *__asan_default_options() {
+  return kAsanDefaultOptionsNaCl;
+}
+#endif
+
 int main(int argc, char *argv[]) {
   CommandLine::Init(argc, argv);
   base::AtExitManager exit_manager;
   base::RandUint64();  // acquire /dev/urandom fd before sandbox is raised
 #if !defined(CHROMIUM_SELINUX)
   // Allows NSS to fopen() /dev/urandom.
   sandbox::InitLibcUrandomOverrides();
 #endif
 #if defined(USE_NSS)
   // Configure NSS for use inside the NaCl process.
@@ skipping 48 matching lines @@
       _exit(-1);
     }
     // if fork fails, send PID=-1 to zygote
     if (!UnixDomainSocket::SendMsg(kNaClZygoteDescriptor, &badpid,
                                    sizeof(badpid), empty)) {
       LOG(ERROR) << "*** send() to zygote failed";
     }
   }
   CHECK(false);  // This routine must not return
 }