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chromium / chromium / src.git / 7c766e9434441f945508f2bbdbe416fd557b7d02 / . / components / nacl / browser / nacl_process_host.cc
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// 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.
#include "components/nacl/browser/nacl_process_host.h"
#include <algorithm>
#include <string>
#include <vector>
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/process/launch.h"
#include "base/process/process_iterator.h"
#include "base/rand_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/windows_version.h"
#include "build/build_config.h"
#include "components/nacl/browser/nacl_browser.h"
#include "components/nacl/browser/nacl_host_message_filter.h"
#include "components/nacl/common/nacl_cmd_line.h"
#include "components/nacl/common/nacl_host_messages.h"
#include "components/nacl/common/nacl_messages.h"
#include "components/nacl/common/nacl_process_type.h"
#include "components/nacl/common/nacl_switches.h"
#include "content/public/browser/browser_child_process_host.h"
#include "content/public/browser/browser_ppapi_host.h"
#include "content/public/browser/child_process_data.h"
#include "content/public/common/child_process_host.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/process_type.h"
#include "ipc/ipc_channel.h"
#include "ipc/ipc_switches.h"
#include "native_client/src/shared/imc/nacl_imc_c.h"
#include "net/base/net_util.h"
#include "net/socket/tcp_listen_socket.h"
#include "ppapi/host/host_factory.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/ppapi_nacl_channel_args.h"
#if defined(OS_POSIX)
#include <fcntl.h>
#include "ipc/ipc_channel_posix.h"
#elif defined(OS_WIN)
#include <windows.h>
#include "base/threading/thread.h"
#include "base/win/scoped_handle.h"
#include "components/nacl/browser/nacl_broker_service_win.h"
#include "components/nacl/common/nacl_debug_exception_handler_win.h"
#include "content/public/common/sandbox_init.h"
#include "content/public/common/sandboxed_process_launcher_delegate.h"
#endif
using content::BrowserThread;
using content::ChildProcessData;
using content::ChildProcessHost;
using ppapi::proxy::SerializedHandle;
#if defined(OS_WIN)
namespace {
// Looks for the largest contiguous unallocated region of address
// space and returns it via |*out_addr| and |*out_size|.
void FindAddressSpace(base::ProcessHandle process,
char** out_addr, size_t* out_size) {
*out_addr = NULL;
*out_size = 0;
char* addr = 0;
while (true) {
MEMORY_BASIC_INFORMATION info;
size_t result = VirtualQueryEx(process, static_cast<void*>(addr),
&info, sizeof(info));
if (result < sizeof(info))
break;
if (info.State == MEM_FREE && info.RegionSize > *out_size) {
*out_addr = addr;
*out_size = info.RegionSize;
}
addr += info.RegionSize;
}
}
} // namespace
namespace nacl {
// Allocates |size| bytes of address space in the given process at a
// randomised address.
void* AllocateAddressSpaceASLR(base::ProcessHandle process, size_t size) {
char* addr;
size_t avail_size;
FindAddressSpace(process, &addr, &avail_size);
if (avail_size < size)
return NULL;
size_t offset = base::RandGenerator(avail_size - size);
const int kPageSize = 0x10000;
void* request_addr =
reinterpret_cast<void*>(reinterpret_cast<uint64>(addr + offset)
& ~(kPageSize - 1));
return VirtualAllocEx(process, request_addr, size,
MEM_RESERVE, PAGE_NOACCESS);
}
} // namespace nacl
#endif // defined(OS_WIN)
namespace {
#if defined(OS_WIN)
bool RunningOnWOW64() {
return (base::win::OSInfo::GetInstance()->wow64_status() ==
base::win::OSInfo::WOW64_ENABLED);
}
// NOTE: changes to this class need to be reviewed by the security team.
class NaClSandboxedProcessLauncherDelegate
: public content::SandboxedProcessLauncherDelegate {
public:
NaClSandboxedProcessLauncherDelegate() {}
virtual ~NaClSandboxedProcessLauncherDelegate() {}
virtual void PostSpawnTarget(base::ProcessHandle process) {
// For Native Client sel_ldr processes on 32-bit Windows, reserve 1 GB of
// address space to prevent later failure due to address space fragmentation
// from .dll loading. The NaCl process will attempt to locate this space by
// scanning the address space using VirtualQuery.
// TODO(bbudge) Handle the --no-sandbox case.
// http://code.google.com/p/nativeclient/issues/detail?id=2131
const SIZE_T kNaClSandboxSize = 1 << 30;
if (!nacl::AllocateAddressSpaceASLR(process, kNaClSandboxSize)) {
DLOG(WARNING) << "Failed to reserve address space for Native Client";
}
}
};
#endif // OS_WIN
void SetCloseOnExec(NaClHandle fd) {
#if defined(OS_POSIX)
int flags = fcntl(fd, F_GETFD);
CHECK_NE(flags, -1);
int rc = fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
CHECK_EQ(rc, 0);
#endif
}
bool ShareHandleToSelLdr(
base::ProcessHandle processh,
NaClHandle sourceh,
bool close_source,
std::vector<nacl::FileDescriptor> *handles_for_sel_ldr) {
#if defined(OS_WIN)
HANDLE channel;
int flags = DUPLICATE_SAME_ACCESS;
if (close_source)
flags |= DUPLICATE_CLOSE_SOURCE;
if (!DuplicateHandle(GetCurrentProcess(),
reinterpret_cast<HANDLE>(sourceh),
processh,
&channel,
0, // Unused given DUPLICATE_SAME_ACCESS.
FALSE,
flags)) {
LOG(ERROR) << "DuplicateHandle() failed";
return false;
}
handles_for_sel_ldr->push_back(
reinterpret_cast<nacl::FileDescriptor>(channel));
#else
nacl::FileDescriptor channel;
channel.fd = sourceh;
channel.auto_close = close_source;
handles_for_sel_ldr->push_back(channel);
#endif
return true;
}
ppapi::PpapiPermissions GetNaClPermissions(uint32 permission_bits) {
// Only allow NaCl plugins to request certain permissions. We don't want
// a compromised renderer to be able to start a nacl plugin with e.g. Flash
// permissions which may expand the surface area of the sandbox.
uint32 masked_bits = permission_bits & ppapi::PERMISSION_DEV;
return ppapi::PpapiPermissions::GetForCommandLine(masked_bits);
}
} // namespace
namespace nacl {
struct NaClProcessHost::NaClInternal {
NaClHandle socket_for_renderer;
NaClHandle socket_for_sel_ldr;
NaClInternal()
: socket_for_renderer(NACL_INVALID_HANDLE),
socket_for_sel_ldr(NACL_INVALID_HANDLE) { }
};
// -----------------------------------------------------------------------------
NaClProcessHost::PluginListener::PluginListener(NaClProcessHost* host)
: host_(host) {
}
bool NaClProcessHost::PluginListener::OnMessageReceived(
const IPC::Message& msg) {
return host_->OnUntrustedMessageForwarded(msg);
}
NaClProcessHost::NaClProcessHost(const GURL& manifest_url,
int render_view_id,
uint32 permission_bits,
bool uses_irt,
bool enable_dyncode_syscalls,
bool enable_exception_handling,
bool enable_crash_throttling,
bool off_the_record,
const base::FilePath& profile_directory)
: manifest_url_(manifest_url),
permissions_(GetNaClPermissions(permission_bits)),
#if defined(OS_WIN)
process_launched_by_broker_(false),
#endif
reply_msg_(NULL),
#if defined(OS_WIN)
debug_exception_handler_requested_(false),
#endif
internal_(new NaClInternal()),
weak_factory_(this),
uses_irt_(uses_irt),
enable_debug_stub_(false),
enable_dyncode_syscalls_(enable_dyncode_syscalls),
enable_exception_handling_(enable_exception_handling),
enable_crash_throttling_(enable_crash_throttling),
off_the_record_(off_the_record),
profile_directory_(profile_directory),
ipc_plugin_listener_(this),
render_view_id_(render_view_id) {
process_.reset(content::BrowserChildProcessHost::Create(
PROCESS_TYPE_NACL_LOADER, this));
// Set the display name so the user knows what plugin the process is running.
// We aren't on the UI thread so getting the pref locale for language
// formatting isn't possible, so IDN will be lost, but this is probably OK
// for this use case.
process_->SetName(net::FormatUrl(manifest_url_, std::string()));
enable_debug_stub_ = CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableNaClDebug);
}
NaClProcessHost::~NaClProcessHost() {
// Report exit status only if the process was successfully started.
if (process_->GetData().handle != base::kNullProcessHandle) {
int exit_code = 0;
process_->GetTerminationStatus(false /* known_dead */, &exit_code);
std::string message =
base::StringPrintf("NaCl process exited with status %i (0x%x)",
exit_code, exit_code);
if (exit_code == 0) {
VLOG(1) << message;
} else {
LOG(ERROR) << message;
}
}
if (internal_->socket_for_renderer != NACL_INVALID_HANDLE) {
if (NaClClose(internal_->socket_for_renderer) != 0) {
NOTREACHED() << "NaClClose() failed";
}
}
if (internal_->socket_for_sel_ldr != NACL_INVALID_HANDLE) {
if (NaClClose(internal_->socket_for_sel_ldr) != 0) {
NOTREACHED() << "NaClClose() failed";
}
}
if (reply_msg_) {
// The process failed to launch for some reason.
// Don't keep the renderer hanging.
reply_msg_->set_reply_error();
nacl_host_message_filter_->Send(reply_msg_);
}
#if defined(OS_WIN)
if (process_launched_by_broker_) {
NaClBrokerService::GetInstance()->OnLoaderDied();
}
#endif
}
void NaClProcessHost::OnProcessCrashed(int exit_status) {
if (enable_crash_throttling_ &&
!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisablePnaclCrashThrottling)) {
NaClBrowser::GetInstance()->OnProcessCrashed();
}
}
// This is called at browser startup.
// static
void NaClProcessHost::EarlyStartup() {
NaClBrowser::GetInstance()->EarlyStartup();
#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
// Open the IRT file early to make sure that it isn't replaced out from
// under us by autoupdate.
NaClBrowser::GetInstance()->EnsureIrtAvailable();
#endif
CommandLine* cmd = CommandLine::ForCurrentProcess();
UMA_HISTOGRAM_BOOLEAN(
"NaCl.nacl-gdb",
!cmd->GetSwitchValuePath(switches::kNaClGdb).empty());
UMA_HISTOGRAM_BOOLEAN(
"NaCl.nacl-gdb-script",
!cmd->GetSwitchValuePath(switches::kNaClGdbScript).empty());
UMA_HISTOGRAM_BOOLEAN(
"NaCl.enable-nacl-debug",
cmd->HasSwitch(switches::kEnableNaClDebug));
NaClBrowser::GetDelegate()->SetDebugPatterns(
cmd->GetSwitchValueASCII(switches::kNaClDebugMask));
}
void NaClProcessHost::Launch(
NaClHostMessageFilter* nacl_host_message_filter,
IPC::Message* reply_msg,
const base::FilePath& manifest_path) {
nacl_host_message_filter_ = nacl_host_message_filter;
reply_msg_ = reply_msg;
manifest_path_ = manifest_path;
// Do not launch the requested NaCl module if NaCl is marked "unstable" due
// to too many crashes within a given time period.
if (enable_crash_throttling_ &&
!CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisablePnaclCrashThrottling) &&
NaClBrowser::GetInstance()->IsThrottled()) {
SendErrorToRenderer("Process creation was throttled due to excessive"
" crashes");
delete this;
return;
}
const CommandLine* cmd = CommandLine::ForCurrentProcess();
#if defined(OS_WIN)
if (cmd->HasSwitch(switches::kEnableNaClDebug) &&
!cmd->HasSwitch(switches::kNoSandbox)) {
// We don't switch off sandbox automatically for security reasons.
SendErrorToRenderer("NaCl's GDB debug stub requires --no-sandbox flag"
" on Windows. See crbug.com/265624.");
delete this;
return;
}
#endif
if (cmd->HasSwitch(switches::kNaClGdb) &&
!cmd->HasSwitch(switches::kEnableNaClDebug)) {
LOG(WARNING) << "--nacl-gdb flag requires --enable-nacl-debug flag";
}
// Start getting the IRT open asynchronously while we launch the NaCl process.
// We'll make sure this actually finished in StartWithLaunchedProcess, below.
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
nacl_browser->EnsureAllResourcesAvailable();
if (!nacl_browser->IsOk()) {
SendErrorToRenderer("could not find all the resources needed"
" to launch the process");
delete this;
return;
}
// Rather than creating a socket pair in the renderer, and passing
// one side through the browser to sel_ldr, socket pairs are created
// in the browser and then passed to the renderer and sel_ldr.
//
// This is mainly for the benefit of Windows, where sockets cannot
// be passed in messages, but are copied via DuplicateHandle().
// This means the sandboxed renderer cannot send handles to the
// browser process.
NaClHandle pair[2];
// Create a connected socket
if (NaClSocketPair(pair) == -1) {
SendErrorToRenderer("NaClSocketPair() failed");
delete this;
return;
}
internal_->socket_for_renderer = pair[0];
internal_->socket_for_sel_ldr = pair[1];
SetCloseOnExec(pair[0]);
SetCloseOnExec(pair[1]);
// Launch the process
if (!LaunchSelLdr()) {
delete this;
}
}
void NaClProcessHost::OnChannelConnected(int32 peer_pid) {
if (!CommandLine::ForCurrentProcess()->GetSwitchValuePath(
switches::kNaClGdb).empty()) {
LaunchNaClGdb();
}
}
#if defined(OS_WIN)
void NaClProcessHost::OnProcessLaunchedByBroker(base::ProcessHandle handle) {
process_launched_by_broker_ = true;
process_->SetHandle(handle);
if (!StartWithLaunchedProcess())
delete this;
}
void NaClProcessHost::OnDebugExceptionHandlerLaunchedByBroker(bool success) {
IPC::Message* reply = attach_debug_exception_handler_reply_msg_.release();
NaClProcessMsg_AttachDebugExceptionHandler::WriteReplyParams(reply, success);
Send(reply);
}
#endif
// Needed to handle sync messages in OnMessageRecieved.
bool NaClProcessHost::Send(IPC::Message* msg) {
return process_->Send(msg);
}
bool NaClProcessHost::LaunchNaClGdb() {
#if defined(OS_WIN)
base::FilePath nacl_gdb =
CommandLine::ForCurrentProcess()->GetSwitchValuePath(switches::kNaClGdb);
CommandLine cmd_line(nacl_gdb);
#else
CommandLine::StringType nacl_gdb =
CommandLine::ForCurrentProcess()->GetSwitchValueNative(
switches::kNaClGdb);
CommandLine::StringVector argv;
// We don't support spaces inside arguments in --nacl-gdb switch.
base::SplitString(nacl_gdb, static_cast<CommandLine::CharType>(' '), &argv);
CommandLine cmd_line(argv);
#endif
cmd_line.AppendArg("--eval-command");
base::FilePath::StringType irt_path(
NaClBrowser::GetInstance()->GetIrtFilePath().value());
// Avoid back slashes because nacl-gdb uses posix escaping rules on Windows.
// See issue https://code.google.com/p/nativeclient/issues/detail?id=3482.
std::replace(irt_path.begin(), irt_path.end(), '\\', '/');
cmd_line.AppendArgNative(FILE_PATH_LITERAL("nacl-irt \"") + irt_path +
FILE_PATH_LITERAL("\""));
if (!manifest_path_.empty()) {
cmd_line.AppendArg("--eval-command");
base::FilePath::StringType manifest_path_value(manifest_path_.value());
std::replace(manifest_path_value.begin(), manifest_path_value.end(),
'\\', '/');
cmd_line.AppendArgNative(FILE_PATH_LITERAL("nacl-manifest \"") +
manifest_path_value + FILE_PATH_LITERAL("\""));
}
cmd_line.AppendArg("--eval-command");
cmd_line.AppendArg("target remote :4014");
base::FilePath script = CommandLine::ForCurrentProcess()->GetSwitchValuePath(
switches::kNaClGdbScript);
if (!script.empty()) {
cmd_line.AppendArg("--command");
cmd_line.AppendArgNative(script.value());
}
return base::LaunchProcess(cmd_line, base::LaunchOptions(), NULL);
}
bool NaClProcessHost::LaunchSelLdr() {
std::string channel_id = process_->GetHost()->CreateChannel();
if (channel_id.empty()) {
SendErrorToRenderer("CreateChannel() failed");
return false;
}
CommandLine::StringType nacl_loader_prefix;
#if defined(OS_POSIX)
nacl_loader_prefix = CommandLine::ForCurrentProcess()->GetSwitchValueNative(
switches::kNaClLoaderCmdPrefix);
#endif // defined(OS_POSIX)
// Build command line for nacl.
#if defined(OS_MACOSX)
// The Native Client process needs to be able to allocate a 1GB contiguous
// region to use as the client environment's virtual address space. ASLR
// (PIE) interferes with this by making it possible that no gap large enough
// to accomodate this request will exist in the child process' address
// space. Disable PIE for NaCl processes. See http://crbug.com/90221 and
// http://code.google.com/p/nativeclient/issues/detail?id=2043.
int flags = ChildProcessHost::CHILD_NO_PIE;
#elif defined(OS_LINUX)
int flags = nacl_loader_prefix.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
ChildProcessHost::CHILD_NORMAL;
#else
int flags = ChildProcessHost::CHILD_NORMAL;
#endif
base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
if (exe_path.empty())
return false;
#if defined(OS_WIN)
// On Windows 64-bit NaCl loader is called nacl64.exe instead of chrome.exe
if (RunningOnWOW64()) {
if (!NaClBrowser::GetInstance()->GetNaCl64ExePath(&exe_path)) {
SendErrorToRenderer("could not get path to nacl64.exe");
return false;
}
}
#endif
scoped_ptr<CommandLine> cmd_line(new CommandLine(exe_path));
CopyNaClCommandLineArguments(cmd_line.get());
cmd_line->AppendSwitchASCII(switches::kProcessType,
switches::kNaClLoaderProcess);
cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
if (NaClBrowser::GetDelegate()->DialogsAreSuppressed())
cmd_line->AppendSwitch(switches::kNoErrorDialogs);
if (!nacl_loader_prefix.empty())
cmd_line->PrependWrapper(nacl_loader_prefix);
// On Windows we might need to start the broker process to launch a new loader
#if defined(OS_WIN)
if (RunningOnWOW64()) {
if (!NaClBrokerService::GetInstance()->LaunchLoader(
weak_factory_.GetWeakPtr(), channel_id)) {
SendErrorToRenderer("broker service did not launch process");
return false;
}
} else {
process_->Launch(new NaClSandboxedProcessLauncherDelegate,
cmd_line.release());
}
#elif defined(OS_POSIX)
process_->Launch(nacl_loader_prefix.empty(), // use_zygote
base::EnvironmentMap(),
cmd_line.release());
#endif
return true;
}
bool NaClProcessHost::OnMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(NaClProcessHost, msg)
IPC_MESSAGE_HANDLER(NaClProcessMsg_QueryKnownToValidate,
OnQueryKnownToValidate)
IPC_MESSAGE_HANDLER(NaClProcessMsg_SetKnownToValidate,
OnSetKnownToValidate)
IPC_MESSAGE_HANDLER_DELAY_REPLY(NaClProcessMsg_ResolveFileToken,
OnResolveFileToken)
#if defined(OS_WIN)
IPC_MESSAGE_HANDLER_DELAY_REPLY(NaClProcessMsg_AttachDebugExceptionHandler,
OnAttachDebugExceptionHandler)
#endif
IPC_MESSAGE_HANDLER(NaClProcessHostMsg_PpapiChannelCreated,
OnPpapiChannelCreated)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void NaClProcessHost::OnProcessLaunched() {
if (!StartWithLaunchedProcess())
delete this;
}
// Called when the NaClBrowser singleton has been fully initialized.
void NaClProcessHost::OnResourcesReady() {
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
if (!nacl_browser->IsReady()) {
SendErrorToRenderer("could not acquire shared resources needed by NaCl");
delete this;
} else if (!SendStart()) {
delete this;
}
}
bool NaClProcessHost::ReplyToRenderer(
const IPC::ChannelHandle& channel_handle) {
#if defined(OS_WIN)
// If we are on 64-bit Windows, the NaCl process's sandbox is
// managed by a different process from the renderer's sandbox. We
// need to inform the renderer's sandbox about the NaCl process so
// that the renderer can send handles to the NaCl process using
// BrokerDuplicateHandle().
if (RunningOnWOW64()) {
if (!content::BrokerAddTargetPeer(process_->GetData().handle)) {
SendErrorToRenderer("BrokerAddTargetPeer() failed");
return false;
}
}
#endif
FileDescriptor handle_for_renderer;
#if defined(OS_WIN)
// Copy the handle into the renderer process.
HANDLE handle_in_renderer;
if (!DuplicateHandle(base::GetCurrentProcessHandle(),
reinterpret_cast<HANDLE>(
internal_->socket_for_renderer),
nacl_host_message_filter_->PeerHandle(),
&handle_in_renderer,
0, // Unused given DUPLICATE_SAME_ACCESS.
FALSE,
DUPLICATE_CLOSE_SOURCE | DUPLICATE_SAME_ACCESS)) {
SendErrorToRenderer("DuplicateHandle() failed");
return false;
}
handle_for_renderer = reinterpret_cast<FileDescriptor>(
handle_in_renderer);
#else
// No need to dup the imc_handle - we don't pass it anywhere else so
// it cannot be closed.
FileDescriptor imc_handle;
imc_handle.fd = internal_->socket_for_renderer;
imc_handle.auto_close = true;
handle_for_renderer = imc_handle;
#endif
const ChildProcessData& data = process_->GetData();
SendMessageToRenderer(
NaClLaunchResult(handle_for_renderer,
channel_handle,
base::GetProcId(data.handle),
data.id),
std::string() /* error_message */);
internal_->socket_for_renderer = NACL_INVALID_HANDLE;
return true;
}
void NaClProcessHost::SendErrorToRenderer(const std::string& error_message) {
LOG(ERROR) << "NaCl process launch failed: " << error_message;
SendMessageToRenderer(NaClLaunchResult(), error_message);
}
void NaClProcessHost::SendMessageToRenderer(
const NaClLaunchResult& result,
const std::string& error_message) {
DCHECK(nacl_host_message_filter_);
DCHECK(reply_msg_);
if (nacl_host_message_filter_ != NULL && reply_msg_ != NULL) {
NaClHostMsg_LaunchNaCl::WriteReplyParams(
reply_msg_, result, error_message);
nacl_host_message_filter_->Send(reply_msg_);
nacl_host_message_filter_ = NULL;
reply_msg_ = NULL;
}
}
// TCP port we chose for NaCl debug stub. It can be any other number.
static const int kDebugStubPort = 4014;
#if defined(OS_POSIX)
net::SocketDescriptor NaClProcessHost::GetDebugStubSocketHandle() {
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
net::SocketDescriptor s = net::kInvalidSocket;
// We allocate currently unused TCP port for debug stub tests. The port
// number is passed to the test via debug stub port listener.
if (nacl_browser->HasGdbDebugStubPortListener()) {
int port;
s = net::TCPListenSocket::CreateAndBindAnyPort("127.0.0.1", &port);
if (s != net::kInvalidSocket) {
nacl_browser->FireGdbDebugStubPortOpened(port);
}
} else {
s = net::TCPListenSocket::CreateAndBind("127.0.0.1", kDebugStubPort);
}
if (s == net::kInvalidSocket) {
LOG(ERROR) << "failed to open socket for debug stub";
return net::kInvalidSocket;
}
if (listen(s, 1)) {
LOG(ERROR) << "listen() failed on debug stub socket";
if (HANDLE_EINTR(close(s)) < 0)
PLOG(ERROR) << "failed to close debug stub socket";
return net::kInvalidSocket;
}
return s;
}
#endif
bool NaClProcessHost::StartNaClExecution() {
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
NaClStartParams params;
params.validation_cache_enabled = nacl_browser->ValidationCacheIsEnabled();
params.validation_cache_key = nacl_browser->GetValidationCacheKey();
params.version = NaClBrowser::GetDelegate()->GetVersionString();
params.enable_exception_handling = enable_exception_handling_;
params.enable_debug_stub = enable_debug_stub_ &&
NaClBrowser::GetDelegate()->URLMatchesDebugPatterns(manifest_url_);
// Enable PPAPI proxy channel creation only for renderer processes.
params.enable_ipc_proxy = enable_ppapi_proxy();
params.uses_irt = uses_irt_;
params.enable_dyncode_syscalls = enable_dyncode_syscalls_;
const ChildProcessData& data = process_->GetData();
if (!ShareHandleToSelLdr(data.handle,
internal_->socket_for_sel_ldr, true,
&params.handles)) {
return false;
}
if (params.uses_irt) {
base::PlatformFile irt_file = nacl_browser->IrtFile();
CHECK_NE(irt_file, base::kInvalidPlatformFileValue);
// Send over the IRT file handle. We don't close our own copy!
if (!ShareHandleToSelLdr(data.handle, irt_file, false, &params.handles))
return false;
}
#if defined(OS_MACOSX)
// For dynamic loading support, NaCl requires a file descriptor that
// was created in /tmp, since those created with shm_open() are not
// mappable with PROT_EXEC. Rather than requiring an extra IPC
// round trip out of the sandbox, we create an FD here.
base::SharedMemory memory_buffer;
base::SharedMemoryCreateOptions options;
options.size = 1;
options.executable = true;
if (!memory_buffer.Create(options)) {
DLOG(ERROR) << "Failed to allocate memory buffer";
return false;
}
FileDescriptor memory_fd;
memory_fd.fd = dup(memory_buffer.handle().fd);
if (memory_fd.fd < 0) {
DLOG(ERROR) << "Failed to dup() a file descriptor";
return false;
}
memory_fd.auto_close = true;
params.handles.push_back(memory_fd);
#endif
#if defined(OS_POSIX)
if (params.enable_debug_stub) {
net::SocketDescriptor server_bound_socket = GetDebugStubSocketHandle();
if (server_bound_socket != net::kInvalidSocket) {
params.debug_stub_server_bound_socket =
FileDescriptor(server_bound_socket, true);
}
}
#endif
process_->Send(new NaClProcessMsg_Start(params));
internal_->socket_for_sel_ldr = NACL_INVALID_HANDLE;
return true;
}
bool NaClProcessHost::SendStart() {
if (!enable_ppapi_proxy()) {
if (!ReplyToRenderer(IPC::ChannelHandle()))
return false;
}
return StartNaClExecution();
}
// This method is called when NaClProcessHostMsg_PpapiChannelCreated is
// received or PpapiHostMsg_ChannelCreated is forwarded by our plugin
// listener.
void NaClProcessHost::OnPpapiChannelCreated(
const IPC::ChannelHandle& channel_handle) {
// Only renderer processes should create a channel.
DCHECK(enable_ppapi_proxy());
// If the proxy channel is null, this must be the initial NaCl-Browser IPC
// channel.
if (!ipc_proxy_channel_.get()) {
DCHECK_EQ(PROCESS_TYPE_NACL_LOADER, process_->GetData().process_type);
ipc_proxy_channel_.reset(
new IPC::ChannelProxy(channel_handle,
IPC::Channel::MODE_CLIENT,
&ipc_plugin_listener_,
base::MessageLoopProxy::current().get()));
// Create the browser ppapi host and enable PPAPI message dispatching to the
// browser process.
ppapi_host_.reset(content::BrowserPpapiHost::CreateExternalPluginProcess(
ipc_proxy_channel_.get(), // sender
permissions_,
process_->GetData().handle,
ipc_proxy_channel_.get(),
nacl_host_message_filter_->render_process_id(),
render_view_id_,
profile_directory_));
ppapi::PpapiNaClChannelArgs args;
args.off_the_record = nacl_host_message_filter_->off_the_record();
args.permissions = permissions_;
CommandLine* cmdline = CommandLine::ForCurrentProcess();
DCHECK(cmdline);
std::string flag_whitelist[] = {switches::kV, switches::kVModule};
for (size_t i = 0; i < arraysize(flag_whitelist); ++i) {
std::string value = cmdline->GetSwitchValueASCII(flag_whitelist[i]);
if (!value.empty()) {
args.switch_names.push_back(flag_whitelist[i]);
args.switch_values.push_back(value);
}
}
ppapi_host_->GetPpapiHost()->AddHostFactoryFilter(
scoped_ptr<ppapi::host::HostFactory>(
NaClBrowser::GetDelegate()->CreatePpapiHostFactory(
ppapi_host_.get())));
// Send a message to create the NaCl-Renderer channel. The handle is just
// a place holder.
ipc_proxy_channel_->Send(
new PpapiMsg_CreateNaClChannel(
nacl_host_message_filter_->render_process_id(),
args,
SerializedHandle(SerializedHandle::CHANNEL_HANDLE,
IPC::InvalidPlatformFileForTransit())));
} else if (reply_msg_) {
// Otherwise, this must be a renderer channel.
ReplyToRenderer(channel_handle);
} else {
// Attempt to open more than 1 renderer channel is not supported.
// Shut down the NaCl process.
process_->GetHost()->ForceShutdown();
}
}
bool NaClProcessHost::OnUntrustedMessageForwarded(const IPC::Message& msg) {
// Handle messages that have been forwarded from our PluginListener.
// These messages come from untrusted code so should be handled with care.
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(NaClProcessHost, msg)
IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
OnPpapiChannelCreated)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
bool NaClProcessHost::StartWithLaunchedProcess() {
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
if (nacl_browser->IsReady()) {
return SendStart();
} else if (nacl_browser->IsOk()) {
nacl_browser->WaitForResources(
base::Bind(&NaClProcessHost::OnResourcesReady,
weak_factory_.GetWeakPtr()));
return true;
} else {
SendErrorToRenderer("previously failed to acquire shared resources");
return false;
}
}
void NaClProcessHost::OnQueryKnownToValidate(const std::string& signature,
bool* result) {
NaClBrowser* nacl_browser = NaClBrowser::GetInstance();
*result = nacl_browser->QueryKnownToValidate(signature, off_the_record_);
}
void NaClProcessHost::OnSetKnownToValidate(const std::string& signature) {
NaClBrowser::GetInstance()->SetKnownToValidate(
signature, off_the_record_);
}
void NaClProcessHost::FileResolved(
base::PlatformFile* file,
const base::FilePath& file_path,
IPC::Message* reply_msg) {
if (*file != base::kInvalidPlatformFileValue) {
IPC::PlatformFileForTransit handle = IPC::GetFileHandleForProcess(
*file,
process_->GetData().handle,
true /* close_source */);
NaClProcessMsg_ResolveFileToken::WriteReplyParams(
reply_msg,
handle,
file_path);
} else {
NaClProcessMsg_ResolveFileToken::WriteReplyParams(
reply_msg,
IPC::InvalidPlatformFileForTransit(),
base::FilePath(FILE_PATH_LITERAL("")));
}
Send(reply_msg);
}
void NaClProcessHost::OnResolveFileToken(uint64 file_token_lo,
uint64 file_token_hi,
IPC::Message* reply_msg) {
// Was the file registered?
//
// Note that the file path cache is of bounded size, and old entries can get
// evicted. If a large number of NaCl modules are being launched at once,
// resolving the file_token may fail because the path cache was thrashed
// while the file_token was in flight. In this case the query fails, and we
// need to fall back to the slower path.
//
// However: each NaCl process will consume 2-3 entries as it starts up, this
// means that eviction will not happen unless you start up 33+ NaCl processes
// at the same time, and this still requires worst-case timing. As a
// practical matter, no entries should be evicted prematurely.
// The cache itself should take ~ (150 characters * 2 bytes/char + ~60 bytes
// data structure overhead) * 100 = 35k when full, so making it bigger should
// not be a problem, if needed.
//
// Each NaCl process will consume 2-3 entries because the manifest and main
// nexe are currently not resolved. Shared libraries will be resolved. They
// will be loaded sequentially, so they will only consume a single entry
// while the load is in flight.
//
// TODO(ncbray): track behavior with UMA. If entries are getting evicted or
// bogus keys are getting queried, this would be good to know.
base::FilePath file_path;
if (!NaClBrowser::GetInstance()->GetFilePath(
file_token_lo, file_token_hi, &file_path)) {
NaClProcessMsg_ResolveFileToken::WriteReplyParams(
reply_msg,
IPC::InvalidPlatformFileForTransit(),
base::FilePath(FILE_PATH_LITERAL("")));
Send(reply_msg);
return;
}
// Scratch space to share between the callbacks.
base::PlatformFile* data = new base::PlatformFile();
// Open the file.
if (!content::BrowserThread::PostBlockingPoolTaskAndReply(
FROM_HERE,
base::Bind(OpenNaClExecutableImpl,
file_path, data),
base::Bind(&NaClProcessHost::FileResolved,
weak_factory_.GetWeakPtr(),
base::Owned(data),
file_path,
reply_msg))) {
NaClProcessMsg_ResolveFileToken::WriteReplyParams(
reply_msg,
IPC::InvalidPlatformFileForTransit(),
base::FilePath(FILE_PATH_LITERAL("")));
Send(reply_msg);
}
}
#if defined(OS_WIN)
void NaClProcessHost::OnAttachDebugExceptionHandler(const std::string& info,
IPC::Message* reply_msg) {
if (!AttachDebugExceptionHandler(info, reply_msg)) {
// Send failure message.
NaClProcessMsg_AttachDebugExceptionHandler::WriteReplyParams(reply_msg,
false);
Send(reply_msg);
}
}
bool NaClProcessHost::AttachDebugExceptionHandler(const std::string& info,
IPC::Message* reply_msg) {
if (!enable_exception_handling_ && !enable_debug_stub_) {
DLOG(ERROR) <<
"Debug exception handler requested by NaCl process when not enabled";
return false;
}
if (debug_exception_handler_requested_) {
// The NaCl process should not request this multiple times.
DLOG(ERROR) << "Multiple AttachDebugExceptionHandler requests received";
return false;
}
debug_exception_handler_requested_ = true;
base::ProcessId nacl_pid = base::GetProcId(process_->GetData().handle);
base::win::ScopedHandle process_handle;
// We cannot use process_->GetData().handle because it does not have
// the necessary access rights. We open the new handle here rather
// than in the NaCl broker process in case the NaCl loader process
// dies before the NaCl broker process receives the message we send.
// The debug exception handler uses DebugActiveProcess() to attach,
// but this takes a PID. We need to prevent the NaCl loader's PID
// from being reused before DebugActiveProcess() is called, and
// holding a process handle open achieves this.
if (!base::OpenProcessHandleWithAccess(
nacl_pid,
base::kProcessAccessQueryInformation |
base::kProcessAccessSuspendResume |
base::kProcessAccessTerminate |
base::kProcessAccessVMOperation |
base::kProcessAccessVMRead |
base::kProcessAccessVMWrite |
base::kProcessAccessDuplicateHandle |
base::kProcessAccessWaitForTermination,
process_handle.Receive())) {
LOG(ERROR) << "Failed to get process handle";
return false;
}
attach_debug_exception_handler_reply_msg_.reset(reply_msg);
// If the NaCl loader is 64-bit, the process running its debug
// exception handler must be 64-bit too, so we use the 64-bit NaCl
// broker process for this. Otherwise, on a 32-bit system, we use
// the 32-bit browser process to run the debug exception handler.
if (RunningOnWOW64()) {
return NaClBrokerService::GetInstance()->LaunchDebugExceptionHandler(
weak_factory_.GetWeakPtr(), nacl_pid, process_handle, info);
} else {
NaClStartDebugExceptionHandlerThread(
process_handle.Take(), info,
base::MessageLoopProxy::current(),
base::Bind(&NaClProcessHost::OnDebugExceptionHandlerLaunchedByBroker,
weak_factory_.GetWeakPtr()));
return true;
}
}
#endif
} // namespace nacl