mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
8e97de2df9
This fixes a bunch of unchecked kernel reads and writes, seems like they would might exploitable :). Write of sockaddr_in size to any address you please...
375 lines
13 KiB
C++
375 lines
13 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 <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/Process.h>
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namespace Kernel {
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#define REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(domain) \
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do { \
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if (domain == AF_INET) \
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REQUIRE_PROMISE(inet); \
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else if (domain == AF_LOCAL) \
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REQUIRE_PROMISE(unix); \
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} while (0)
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int Process::sys$socket(int domain, int type, int protocol)
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{
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(domain);
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if ((type & SOCK_TYPE_MASK) == SOCK_RAW && !is_superuser())
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return -EACCES;
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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auto result = Socket::create(domain, type, protocol);
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if (result.is_error())
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return result.error();
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auto description = FileDescription::create(*result.value());
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description->set_readable(true);
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description->set_writable(true);
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unsigned flags = 0;
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if (type & SOCK_CLOEXEC)
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flags |= FD_CLOEXEC;
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if (type & SOCK_NONBLOCK)
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description->set_blocking(false);
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m_fds[fd].set(move(description), flags);
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return fd;
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}
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int Process::sys$bind(int sockfd, Userspace<const sockaddr*> address, socklen_t address_length)
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{
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if (!validate_read(address, address_length))
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return -EFAULT;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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return socket.bind(address, address_length);
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}
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int Process::sys$listen(int sockfd, int backlog)
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{
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if (backlog < 0)
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return -EINVAL;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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if (socket.is_connected())
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return -EINVAL;
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return socket.listen(backlog);
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}
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int Process::sys$accept(int accepting_socket_fd, Userspace<sockaddr*> user_address, Userspace<socklen_t*> user_address_size)
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{
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REQUIRE_PROMISE(accept);
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socklen_t address_size = 0;
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if (user_address) {
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if (!validate_write_typed(user_address_size))
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return -EFAULT;
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if (!validate_read_and_copy_typed(&address_size, user_address_size))
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return -EFAULT;
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if (!validate_write(user_address, address_size))
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return -EFAULT;
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}
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int accepted_socket_fd = alloc_fd();
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if (accepted_socket_fd < 0)
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return accepted_socket_fd;
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auto accepting_socket_description = file_description(accepting_socket_fd);
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if (!accepting_socket_description)
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return -EBADF;
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if (!accepting_socket_description->is_socket())
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return -ENOTSOCK;
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auto& socket = *accepting_socket_description->socket();
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if (!socket.can_accept()) {
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if (accepting_socket_description->is_blocking()) {
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if (Thread::current()->block<Thread::AcceptBlocker>(nullptr, *accepting_socket_description).was_interrupted())
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return -EINTR;
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} else {
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return -EAGAIN;
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}
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}
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auto accepted_socket = socket.accept();
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ASSERT(accepted_socket);
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if (user_address) {
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u8 address_buffer[sizeof(sockaddr_un)];
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address_size = min(sizeof(sockaddr_un), static_cast<size_t>(address_size));
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accepted_socket->get_peer_address((sockaddr*)address_buffer, &address_size);
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copy_to_user(user_address, address_buffer, address_size);
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copy_to_user(user_address_size, &address_size);
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}
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auto accepted_socket_description = FileDescription::create(*accepted_socket);
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accepted_socket_description->set_readable(true);
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accepted_socket_description->set_writable(true);
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// NOTE: The accepted socket inherits fd flags from the accepting socket.
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// I'm not sure if this matches other systems but it makes sense to me.
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accepted_socket_description->set_blocking(accepting_socket_description->is_blocking());
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m_fds[accepted_socket_fd].set(move(accepted_socket_description), m_fds[accepting_socket_fd].flags());
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// NOTE: Moving this state to Completed is what causes connect() to unblock on the client side.
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accepted_socket->set_setup_state(Socket::SetupState::Completed);
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return accepted_socket_fd;
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}
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int Process::sys$connect(int sockfd, Userspace<const sockaddr*> user_address, socklen_t user_address_size)
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{
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if (!validate_read(user_address, user_address_size))
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return -EFAULT;
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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u8 address[sizeof(sockaddr_un)];
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size_t address_size = min(sizeof(address), static_cast<size_t>(user_address_size));
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copy_from_user(address, user_address, address_size);
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return socket.connect(*description, (const sockaddr*)address, address_size, description->is_blocking() ? ShouldBlock::Yes : ShouldBlock::No);
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}
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int Process::sys$shutdown(int sockfd, int how)
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{
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REQUIRE_PROMISE(stdio);
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if (how & ~SHUT_RDWR)
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return -EINVAL;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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return socket.shutdown(how);
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}
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ssize_t Process::sys$sendto(Userspace<const Syscall::SC_sendto_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_sendto_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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int flags = params.flags;
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Userspace<const sockaddr*> addr = params.addr;
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socklen_t addr_length = params.addr_length;
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if (!validate(params.data))
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return -EFAULT;
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if (addr && !validate_read(addr, addr_length))
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return -EFAULT;
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auto description = file_description(params.sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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if (socket.is_shut_down_for_writing())
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return -EPIPE;
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SmapDisabler disabler;
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auto result = socket.sendto(*description, params.data.data, params.data.size, flags, addr, addr_length);
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if (result.is_error())
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return result.error();
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return result.value();
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}
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ssize_t Process::sys$recvfrom(Userspace<const Syscall::SC_recvfrom_params*> user_params)
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{
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REQUIRE_PROMISE(stdio);
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Syscall::SC_recvfrom_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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int flags = params.flags;
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Userspace<sockaddr*> user_addr = params.addr;
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Userspace<socklen_t*> user_addr_length = params.addr_length;
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SmapDisabler disabler;
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if (!validate(params.buffer))
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return -EFAULT;
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if (user_addr_length) {
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socklen_t addr_length;
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if (!validate_read_and_copy_typed(&addr_length, user_addr_length))
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return -EFAULT;
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if (!validate_write_typed(user_addr_length))
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return -EFAULT;
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if (!validate_write(user_addr, addr_length))
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return -EFAULT;
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} else if (user_addr) {
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return -EINVAL;
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}
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auto description = file_description(params.sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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if (socket.is_shut_down_for_reading())
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return 0;
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bool original_blocking = description->is_blocking();
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if (flags & MSG_DONTWAIT)
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description->set_blocking(false);
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auto result = socket.recvfrom(*description, params.buffer.data, params.buffer.size, flags, user_addr, user_addr_length);
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if (flags & MSG_DONTWAIT)
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description->set_blocking(original_blocking);
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if (result.is_error())
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return result.error();
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return result.value();
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}
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template<bool sockname, typename Params>
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int Process::get_sock_or_peer_name(const Params& params)
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{
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socklen_t addrlen_value;
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if (!validate_read_and_copy_typed(&addrlen_value, params.addrlen))
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return -EFAULT;
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if (addrlen_value <= 0)
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return -EINVAL;
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if (!validate_write(params.addr, addrlen_value))
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return -EFAULT;
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if (!validate_write_typed(params.addrlen))
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return -EFAULT;
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auto description = file_description(params.sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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u8 address_buffer[sizeof(sockaddr_un)];
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addrlen_value = min(sizeof(sockaddr_un), static_cast<size_t>(addrlen_value));
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if constexpr (sockname)
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socket.get_local_address((sockaddr*)address_buffer, &addrlen_value);
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else
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socket.get_peer_address((sockaddr*)address_buffer, &addrlen_value);
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copy_to_user(params.addr, address_buffer, addrlen_value);
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copy_to_user(params.addrlen, &addrlen_value);
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return 0;
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}
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int Process::sys$getsockname(Userspace<const Syscall::SC_getsockname_params*> user_params)
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{
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Syscall::SC_getsockname_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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return get_sock_or_peer_name<true>(params);
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}
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int Process::sys$getpeername(Userspace<const Syscall::SC_getpeername_params*> user_params)
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{
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Syscall::SC_getpeername_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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return get_sock_or_peer_name<false>(params);
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}
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int Process::sys$getsockopt(Userspace<const Syscall::SC_getsockopt_params*> user_params)
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{
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Syscall::SC_getsockopt_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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int sockfd = params.sockfd;
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int level = params.level;
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int option = params.option;
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Userspace<void*> user_value = params.value;
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Userspace<socklen_t*> user_value_size = params.value_size;
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if (!validate_write_typed(user_value_size))
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return -EFAULT;
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socklen_t value_size;
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if (!validate_read_and_copy_typed(&value_size, user_value_size))
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return -EFAULT;
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if (!validate_write(user_value, value_size))
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return -EFAULT;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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if (has_promised(Pledge::accept) && socket.is_local() && level == SOL_SOCKET && option == SO_PEERCRED) {
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// We make an exception for SOL_SOCKET::SO_PEERCRED on local sockets if you've pledged "accept"
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} else {
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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}
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return socket.getsockopt(*description, level, option, user_value, user_value_size);
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}
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int Process::sys$setsockopt(Userspace<const Syscall::SC_setsockopt_params*> user_params)
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{
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Syscall::SC_setsockopt_params params;
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if (!validate_read_and_copy_typed(¶ms, user_params))
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return -EFAULT;
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if (!validate_read(params.value, params.value_size))
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return -EFAULT;
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auto description = file_description(params.sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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return socket.setsockopt(params.level, params.option, params.value, params.value_size);
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}
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}
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