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c8d9f1b9c9
Since the CPU already does almost all necessary validation steps for us, we don't really need to attempt to do this. Doing it ourselves doesn't really work very reliably, because we'd have to account for other processors modifying virtual memory, and we'd have to account for e.g. pages not being able to be allocated due to insufficient resources. So change the copy_to/from_user (and associated helper functions) to use the new safe_memcpy, which will return whether it succeeded or not. The only manual validation step needed (which the CPU can't perform for us) is making sure the pointers provided by user mode aren't pointing to kernel mappings. To make it easier to read/write from/to either kernel or user mode data add the UserOrKernelBuffer helper class, which will internally either use copy_from/to_user or directly memcpy, or pass the data through directly using a temporary buffer on the stack. Last but not least we need to keep syscall params trivial as we need to copy them from/to user mode using copy_from/to_user.
346 lines
12 KiB
C++
346 lines
12 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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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 && !copy_from_user(&address_size, static_ptr_cast<const socklen_t*>(user_address_size)))
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return -EFAULT;
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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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if (!copy_to_user(user_address, address_buffer, address_size))
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return -EFAULT;
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if (!copy_to_user(user_address_size, &address_size))
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return -EFAULT;
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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$connect(int sockfd, Userspace<const sockaddr*> user_address, socklen_t user_address_size)
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{
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int fd = alloc_fd();
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if (fd < 0)
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return fd;
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auto description = file_description(sockfd);
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if (!description)
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return -EBADF;
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if (!description->is_socket())
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return -ENOTSOCK;
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auto& socket = *description->socket();
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REQUIRE_PROMISE_FOR_SOCKET_DOMAIN(socket.domain());
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return socket.connect(*description, user_address, user_address_size, description->is_blocking() ? ShouldBlock::Yes : ShouldBlock::No);
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}
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int Process::sys$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 (!copy_from_user(¶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((FlatPtr)params.addr);
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socklen_t addr_length = params.addr_length;
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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 data_buffer = UserOrKernelBuffer::for_user_buffer(const_cast<u8*>((const u8*)params.data.data), params.data.size);
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if (!data_buffer.has_value())
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return -EFAULT;
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auto result = socket.sendto(*description, data_buffer.value(), 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 (!copy_from_user(¶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((FlatPtr)params.addr);
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Userspace<socklen_t*> user_addr_length((FlatPtr)params.addr_length);
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SmapDisabler disabler;
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if (!user_addr_length && user_addr)
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return -EINVAL;
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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 data_buffer = UserOrKernelBuffer::for_user_buffer(const_cast<u8*>((const u8*)params.buffer.data), params.buffer.size);
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if (!data_buffer.has_value())
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return -EFAULT;
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auto result = socket.recvfrom(*description, data_buffer.value(), 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 (!copy_from_user(&addrlen_value, params.addrlen, sizeof(socklen_t)))
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return -EFAULT;
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if (addrlen_value <= 0)
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return -EINVAL;
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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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if (!copy_to_user(params.addr, address_buffer, addrlen_value))
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return -EFAULT;
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if (!copy_to_user(params.addrlen, &addrlen_value))
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return -EFAULT;
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return 0;
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}
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int Process::sys$getsockname(Userspace<const Syscall::SC_getsockname_params*> user_params)
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{
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Syscall::SC_getsockname_params params;
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if (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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return get_sock_or_peer_name<true>(params);
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}
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int Process::sys$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 (!copy_from_user(¶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 (!copy_from_user(¶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((FlatPtr)params.value);
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Userspace<socklen_t*> user_value_size((FlatPtr)params.value_size);
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socklen_t value_size;
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if (!copy_from_user(&value_size, params.value_size, sizeof(socklen_t)))
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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 (!copy_from_user(¶ms, user_params))
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return -EFAULT;
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Userspace<const void*> user_value((FlatPtr)params.value);
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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, user_value, params.value_size);
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}
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}
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