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https://github.com/SerenityOS/serenity.git
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b374dd03bd
copy_from_user can fail, for example when the user-supplied pointer is just before the end of mapped address space. In that case, the first few bytes would get copied, permanently overwriting the internal state of the Socket, potentially leaving it in an inconsistent or at least difficult-to-predict state.
279 lines
9 KiB
C++
279 lines
9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <AK/StringView.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/Net/IPv4Socket.h>
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#include <Kernel/Net/LocalSocket.h>
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#include <Kernel/Net/Socket.h>
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#include <Kernel/Process.h>
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#include <Kernel/UnixTypes.h>
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#include <LibC/errno_numbers.h>
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namespace Kernel {
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KResultOr<NonnullRefPtr<Socket>> Socket::create(int domain, int type, int protocol)
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{
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switch (domain) {
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case AF_LOCAL:
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return LocalSocket::create(type & SOCK_TYPE_MASK);
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case AF_INET:
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return IPv4Socket::create(type & SOCK_TYPE_MASK, protocol);
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default:
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return EAFNOSUPPORT;
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}
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}
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Socket::Socket(int domain, int type, int protocol)
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: m_domain(domain)
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, m_type(type)
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, m_protocol(protocol)
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{
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auto& process = *Process::current();
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m_origin = { process.pid().value(), process.uid(), process.gid() };
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}
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Socket::~Socket()
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{
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}
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void Socket::set_setup_state(SetupState new_setup_state)
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{
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dbgln_if(SOCKET_DEBUG, "Socket({}) setup state moving from {} to {}", this, to_string(m_setup_state), to_string(new_setup_state));
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m_setup_state = new_setup_state;
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evaluate_block_conditions();
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}
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RefPtr<Socket> Socket::accept()
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{
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LOCKER(m_lock);
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if (m_pending.is_empty())
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return nullptr;
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dbgln_if(SOCKET_DEBUG, "Socket({}) de-queueing connection", this);
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auto client = m_pending.take_first();
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VERIFY(!client->is_connected());
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auto& process = *Process::current();
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client->m_acceptor = { process.pid().value(), process.uid(), process.gid() };
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client->m_connected = true;
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client->m_role = Role::Accepted;
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if (!m_pending.is_empty())
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evaluate_block_conditions();
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return client;
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}
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KResult Socket::queue_connection_from(NonnullRefPtr<Socket> peer)
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{
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dbgln_if(SOCKET_DEBUG, "Socket({}) queueing connection", this);
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LOCKER(m_lock);
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if (m_pending.size() >= m_backlog)
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return ECONNREFUSED;
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m_pending.append(peer);
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evaluate_block_conditions();
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return KSuccess;
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}
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KResult Socket::setsockopt(int level, int option, Userspace<const void*> user_value, socklen_t user_value_size)
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{
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if (level != SOL_SOCKET)
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return ENOPROTOOPT;
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VERIFY(level == SOL_SOCKET);
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switch (option) {
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case SO_SNDTIMEO:
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if (user_value_size != sizeof(timeval))
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return EINVAL;
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if (!copy_from_user(&m_send_timeout, static_ptr_cast<const timeval*>(user_value)))
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return EFAULT;
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return KSuccess;
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case SO_RCVTIMEO:
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if (user_value_size != sizeof(timeval))
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return EINVAL;
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if (!copy_from_user(&m_receive_timeout, static_ptr_cast<const timeval*>(user_value)))
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return EFAULT;
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return KSuccess;
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case SO_BINDTODEVICE: {
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if (user_value_size != IFNAMSIZ)
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return EINVAL;
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auto user_string = static_ptr_cast<const char*>(user_value);
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auto ifname = copy_string_from_user(user_string, user_value_size);
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if (ifname.is_null())
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return EFAULT;
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auto device = NetworkAdapter::lookup_by_name(ifname);
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if (!device)
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return ENODEV;
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m_bound_interface = device;
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return KSuccess;
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}
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case SO_KEEPALIVE:
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// FIXME: Obviously, this is not a real keepalive.
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return KSuccess;
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case SO_TIMESTAMP:
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if (user_value_size != sizeof(int))
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return EINVAL;
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{
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int timestamp;
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if (!copy_from_user(×tamp, static_ptr_cast<const int*>(user_value)))
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return EFAULT;
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m_timestamp = timestamp;
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}
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if (m_timestamp && (domain() != AF_INET || type() == SOCK_STREAM)) {
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// FIXME: Support SO_TIMESTAMP for more protocols?
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m_timestamp = 0;
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return ENOTSUP;
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}
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return KSuccess;
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default:
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dbgln("setsockopt({}) at SOL_SOCKET not implemented.", option);
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return ENOPROTOOPT;
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}
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}
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KResult Socket::getsockopt(FileDescription&, int level, int option, Userspace<void*> value, Userspace<socklen_t*> value_size)
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{
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socklen_t size;
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if (!copy_from_user(&size, value_size.unsafe_userspace_ptr()))
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return EFAULT;
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// FIXME: Add TCP_NODELAY, IPPROTO_TCP and IPPROTO_IP (used in OpenSSH)
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if (level != SOL_SOCKET) {
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// Not sure if this is the correct error code, but it's only temporary until other levels are implemented.
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return ENOPROTOOPT;
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}
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switch (option) {
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case SO_SNDTIMEO:
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if (size < sizeof(timeval))
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return EINVAL;
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if (!copy_to_user(static_ptr_cast<timeval*>(value), &m_send_timeout))
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return EFAULT;
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size = sizeof(timeval);
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return KSuccess;
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case SO_RCVTIMEO:
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if (size < sizeof(timeval))
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return EINVAL;
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if (!copy_to_user(static_ptr_cast<timeval*>(value), &m_receive_timeout))
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return EFAULT;
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size = sizeof(timeval);
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return KSuccess;
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case SO_ERROR: {
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if (size < sizeof(int))
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return EINVAL;
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dbgln("getsockopt(SO_ERROR): FIXME!");
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int errno = 0;
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if (!copy_to_user(static_ptr_cast<int*>(value), &errno))
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return EFAULT;
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size = sizeof(int);
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return KSuccess;
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}
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case SO_BINDTODEVICE:
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if (size < IFNAMSIZ)
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return EINVAL;
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if (m_bound_interface) {
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const auto& name = m_bound_interface->name();
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auto length = name.length() + 1;
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if (!copy_to_user(static_ptr_cast<char*>(value), name.characters(), length))
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return EFAULT;
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size = length;
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return KSuccess;
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} else {
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size = 0;
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return EFAULT;
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}
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case SO_TIMESTAMP:
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if (size < sizeof(int))
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return EINVAL;
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if (!copy_to_user(static_ptr_cast<int*>(value), &m_timestamp))
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return EFAULT;
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size = sizeof(int);
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if (!copy_to_user(value_size, &size))
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return EFAULT;
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return KSuccess;
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default:
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dbgln("setsockopt({}) at SOL_SOCKET not implemented.", option);
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return ENOPROTOOPT;
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}
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}
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KResultOr<size_t> Socket::read(FileDescription& description, size_t, UserOrKernelBuffer& buffer, size_t size)
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{
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if (is_shut_down_for_reading())
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return 0;
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timeval tv;
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return recvfrom(description, buffer, size, 0, {}, 0, tv);
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}
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KResultOr<size_t> Socket::write(FileDescription& description, size_t, const UserOrKernelBuffer& data, size_t size)
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{
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if (is_shut_down_for_writing())
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return -EPIPE;
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return sendto(description, data, size, 0, {}, 0);
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}
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KResult Socket::shutdown(int how)
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{
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LOCKER(lock());
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if (type() == SOCK_STREAM && !is_connected())
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return ENOTCONN;
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if (m_role == Role::Listener)
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return ENOTCONN;
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if (!m_shut_down_for_writing && (how & SHUT_WR))
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shut_down_for_writing();
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if (!m_shut_down_for_reading && (how & SHUT_RD))
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shut_down_for_reading();
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m_shut_down_for_reading |= (how & SHUT_RD) != 0;
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m_shut_down_for_writing |= (how & SHUT_WR) != 0;
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return KSuccess;
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}
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KResult Socket::stat(::stat& st) const
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{
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memset(&st, 0, sizeof(st));
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st.st_mode = S_IFSOCK;
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return KSuccess;
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}
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void Socket::set_connected(bool connected)
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{
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LOCKER(lock());
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if (m_connected == connected)
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return;
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m_connected = connected;
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evaluate_block_conditions();
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}
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}
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