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LibWeb: Send IPC messages exceeding socket buffer through shared memory

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It turned out that some web applications want to send fairly large
messages to WebWorker through IPC (for example, MapLibre GL sends
~1200KiB), which led to failures (at least on macOS) because buffer size
of TransportSocket is limited to 128KiB. This change solves the problem
by wrapping messages that exceed socket buffer size into another message
that holds wrapped message content in shared memory.

Co-Authored-By: Luke Wilde <luke@ladybird.org>
This commit is contained in:
Aliaksandr Kalenik 2025-04-03 02:55:11 +02:00 • committed by Andreas Kling
commit 4b04e97feb
Notes: github-actions[bot] 2025-04-03 11:56:37 +00:00
11 changed files with 173 additions and 18 deletions
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52
Libraries/LibIPC/Message.cpp
View file

@ -5,6 +5,8 @@
*/
#include <AK/Checked.h>
#include <LibIPC/Decoder.h>
#include <LibIPC/Encoder.h>
#include <LibIPC/Message.h>
namespace IPC {
@ -59,4 +61,54 @@ ErrorOr<void> MessageBuffer::transfer_message(Transport& transport)
return {};
}
NonnullOwnPtr<LargeMessageWrapper> LargeMessageWrapper::create(u32 endpoint_magic, MessageBuffer& buffer_to_wrap)
{
auto size = buffer_to_wrap.data().size() - sizeof(MessageSizeType);
u8 const* data = buffer_to_wrap.data().data() + sizeof(MessageSizeType);
auto wrapped_message_data = MUST(Core::AnonymousBuffer::create_with_size(size));
memcpy(wrapped_message_data.data<void>(), data, size);
Vector<File> files;
for (auto& owned_fd : buffer_to_wrap.take_fds()) {
files.append(File::adopt_fd(owned_fd->take_fd()));
}
return make<LargeMessageWrapper>(endpoint_magic, move(wrapped_message_data), move(files));
}
LargeMessageWrapper::LargeMessageWrapper(u32 endpoint_magic, Core::AnonymousBuffer wrapped_message_data, Vector<File>&& wrapped_fds)
: m_endpoint_magic(endpoint_magic)
, m_wrapped_message_data(move(wrapped_message_data))
, m_wrapped_fds(move(wrapped_fds))
{
}
ErrorOr<MessageBuffer> LargeMessageWrapper::encode() const
{
MessageBuffer buffer;
Encoder stream { buffer };
TRY(stream.encode(m_endpoint_magic));
TRY(stream.encode(MESSAGE_ID));
TRY(stream.encode(m_wrapped_message_data));
TRY(stream.encode(m_wrapped_fds.size()));
for (auto const& wrapped_fd : m_wrapped_fds) {
TRY(stream.append_file_descriptor(wrapped_fd.take_fd()));
}
return buffer;
}
ErrorOr<NonnullOwnPtr<LargeMessageWrapper>> LargeMessageWrapper::decode(u32 endpoint_magic, Stream& stream, UnprocessedFileDescriptors& files)
{
Decoder decoder { stream, files };
auto wrapped_message_data = TRY(decoder.decode<Core::AnonymousBuffer>());
Vector<File> wrapped_fds;
auto num_fds = TRY(decoder.decode<u32>());
for (u32 i = 0; i < num_fds; ++i) {
auto fd = TRY(decoder.decode<IPC::File>());
wrapped_fds.append(move(fd));
}
return make<LargeMessageWrapper>(endpoint_magic, wrapped_message_data, move(wrapped_fds));
}
}