| // 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 "content/browser/sandbox_host_linux.h" |
| |
| #include <sys/socket.h> |
| |
| #include "base/memory/singleton.h" |
| #include "base/posix/eintr_wrapper.h" |
| |
| namespace content { |
| |
| // Runs on the main thread at startup. |
| SandboxHostLinux::SandboxHostLinux() = default; |
| |
| // static |
| SandboxHostLinux* SandboxHostLinux::GetInstance() { |
| return base::Singleton<SandboxHostLinux>::get(); |
| } |
| |
| void SandboxHostLinux::Init() { |
| DCHECK(!initialized_); |
| initialized_ = true; |
| |
| int fds[2]; |
| // We use SOCK_SEQPACKET rather than SOCK_DGRAM to prevent the sandboxed |
| // processes from sending datagrams to other sockets on the system. The |
| // sandbox may prevent the sandboxed process from calling socket() to create |
| // new sockets, but it'll still inherit some sockets. With AF_UNIX+SOCK_DGRAM, |
| // it can call sendmsg to send a datagram to any (abstract) socket on the same |
| // system. With SOCK_SEQPACKET, this is prevented. |
| CHECK(socketpair(AF_UNIX, SOCK_SEQPACKET, 0, fds) == 0); |
| |
| child_socket_ = fds[0]; |
| // The SandboxIPC client is not expected to read from |child_socket_|. |
| // Instead, it reads from a temporary socket sent with the request. |
| PCHECK(0 == shutdown(child_socket_, SHUT_RD)) << "shutdown"; |
| |
| const int browser_socket = fds[1]; |
| // The SandboxIPC handler is not expected to write to |browser_socket|. |
| // Instead, it replies on a temporary socket provided by the caller. |
| PCHECK(0 == shutdown(browser_socket, SHUT_WR)) << "shutdown"; |
| |
| int pipefds[2]; |
| CHECK(0 == pipe(pipefds)); |
| const int child_lifeline_fd = pipefds[0]; |
| childs_lifeline_fd_ = pipefds[1]; |
| |
| ipc_handler_.reset(new SandboxIPCHandler(child_lifeline_fd, browser_socket)); |
| ipc_thread_.reset( |
| new base::DelegateSimpleThread(ipc_handler_.get(), "sandbox_ipc_thread")); |
| ipc_thread_->Start(); |
| } |
| |
| bool SandboxHostLinux::ShutdownIPCChannel() { |
| return IGNORE_EINTR(close(childs_lifeline_fd_)) == 0; |
| } |
| |
| SandboxHostLinux::~SandboxHostLinux() { |
| if (initialized_) { |
| if (!ShutdownIPCChannel()) |
| LOG(ERROR) << "ShutdownIPCChannel failed"; |
| if (IGNORE_EINTR(close(child_socket_)) < 0) |
| PLOG(ERROR) << "close"; |
| |
| ipc_thread_->Join(); |
| } |
| } |
| |
| } // namespace content |