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Kernel: Don't assert when reading from a listening-mode local socket

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Instead just fail with EINVAL as a listening socket is never suitable
for reading from.

Fixes #4511.
This commit is contained in:
Andreas Kling 2020-12-23 20:24:00 +01:00
parent 80ae407d73
commit c6a0694f50
Notes: sideshowbarker 2024-07-19 00:39:16 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c6a0694f50f
2 changed files with 21 additions and 16 deletions
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33
Kernel/Net/LocalSocket.cpp
View File

@ -286,37 +286,42 @@ KResultOr<size_t> LocalSocket::sendto(FileDescription& description, const UserOr
{
if (!has_attached_peer(description))
return KResult(-EPIPE);
ssize_t nwritten = send_buffer_for(description).write(data, data_size);
auto* socket_buffer = send_buffer_for(description);
if (!socket_buffer)
return KResult(-EINVAL);
ssize_t nwritten = socket_buffer->write(data, data_size);
if (nwritten > 0)
Thread::current()->did_unix_socket_write(nwritten);
return nwritten;
}
DoubleBuffer& LocalSocket::receive_buffer_for(FileDescription& description)
DoubleBuffer* LocalSocket::receive_buffer_for(FileDescription& description)
{
auto role = this->role(description);
if (role == Role::Accepted)
return m_for_server;
return &m_for_server;
if (role == Role::Connected)
return m_for_client;
ASSERT_NOT_REACHED();
return &m_for_client;
return nullptr;
}
DoubleBuffer& LocalSocket::send_buffer_for(FileDescription& description)
DoubleBuffer* LocalSocket::send_buffer_for(FileDescription& description)
{
auto role = this->role(description);
if (role == Role::Connected)
return m_for_server;
return &m_for_server;
if (role == Role::Accepted)
return m_for_client;
ASSERT_NOT_REACHED();
return &m_for_client;
return nullptr;
}
KResultOr<size_t> LocalSocket::recvfrom(FileDescription& description, UserOrKernelBuffer& buffer, size_t buffer_size, int, Userspace<sockaddr*>, Userspace<socklen_t*>, timeval&)
{
auto& buffer_for_me = receive_buffer_for(description);
auto* socket_buffer = receive_buffer_for(description);
if (!socket_buffer)
return KResult(-EINVAL);
if (!description.is_blocking()) {
if (buffer_for_me.is_empty()) {
if (socket_buffer->is_empty()) {
if (!has_attached_peer(description))
return 0;
return KResult(-EAGAIN);
@ -326,10 +331,10 @@ KResultOr<size_t> LocalSocket::recvfrom(FileDescription& description, UserOrKern
if (Thread::current()->block<Thread::ReadBlocker>(nullptr, description, unblock_flags).was_interrupted())
return KResult(-EINTR);
}
if (!has_attached_peer(description) && buffer_for_me.is_empty())
if (!has_attached_peer(description) && socket_buffer->is_empty())
return 0;
ASSERT(!buffer_for_me.is_empty());
int nread = buffer_for_me.read(buffer, buffer_size);
ASSERT(!socket_buffer->is_empty());
auto nread = socket_buffer->read(buffer, buffer_size);
if (nread > 0)
Thread::current()->did_unix_socket_read(nread);
return nread;

4
Kernel/Net/LocalSocket.h
View File

@ -72,8 +72,8 @@ private:
virtual bool is_local() const override { return true; }
bool has_attached_peer(const FileDescription&) const;
static Lockable<InlineLinkedList<LocalSocket>>& all_sockets();
DoubleBuffer& receive_buffer_for(FileDescription&);
DoubleBuffer& send_buffer_for(FileDescription&);
DoubleBuffer* receive_buffer_for(FileDescription&);
DoubleBuffer* send_buffer_for(FileDescription&);
NonnullRefPtrVector<FileDescription>& sendfd_queue_for(const FileDescription&);
NonnullRefPtrVector<FileDescription>& recvfd_queue_for(const FileDescription&);