NonSFI NaCl: Plumb Exception IRT enough for breakpad.

components/nacl/loader/nacl_helper_linux.cc

 // Copyright 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.
 
 // A mini-zygote specifically for Native Client.
 
 #include "components/nacl/loader/nacl_helper_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
@@ skipping 14 matching lines @@
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/posix/global_descriptors.h"
 #include "base/posix/unix_domain_socket_linux.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "base/rand_util.h"
 #include "components/nacl/common/nacl_switches.h"
 #include "components/nacl/loader/nacl_listener.h"
+#include "components/nacl/loader/nonsfi/irt_exception_handling.h"
 #include "components/nacl/loader/sandbox_linux/nacl_sandbox_linux.h"
 #include "content/public/common/content_descriptors.h"
 #include "content/public/common/zygote_fork_delegate_linux.h"
 #include "crypto/nss_util.h"
 #include "ipc/ipc_descriptors.h"
 #include "ipc/ipc_switches.h"
 #include "sandbox/linux/services/libc_urandom_override.h"
 
 namespace {
 
@@ skipping 30 matching lines @@
     // various operations. See the LinuxSandbox::METHOD_* methods. NaCl uses
     // LinuxSandbox::METHOD_MAKE_SHARED_MEMORY_SEGMENT in SFI mode, so this
     // should only be closed in Non-SFI mode.
     // This file descriptor is insidiously used by a number of APIs. Closing it
     // could lead to difficult to debug issues. Instead of closing it, replace
     // it with a dummy.
     const int sandbox_ipc_channel =
         base::GlobalDescriptors::kBaseDescriptor + kSandboxIPCChannel;
 
     ReplaceFDWithDummy(sandbox_ipc_channel);
+
+    // Install crash signal handlers before disallowing system calls.
+    nacl::nonsfi::InitializeSignalHandler();
   }
 
   // Finish layer-1 sandbox initialization and initialize the layer-2 sandbox.
   CHECK(!nacl_sandbox->HasOpenDirectory());
   nacl_sandbox->InitializeLayerTwoSandbox(uses_nonsfi_mode);
   nacl_sandbox->SealLayerOneSandbox();
   nacl_sandbox->CheckSandboxingStateWithPolicy();
 
   base::GlobalDescriptors::GetInstance()->Set(
       kPrimaryIPCChannel,
@@ skipping 342 matching lines @@
   // Now handle requests from the Zygote.
   while (true) {
     bool request_handled = HandleZygoteRequest(
         kNaClZygoteDescriptor, system_info, nacl_sandbox.get());
     // Do not turn this into a CHECK() without thinking about robustness
     // against malicious IPC requests.
     DCHECK(request_handled);
   }
   NOTREACHED();
 }