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UserspaceEmulator: Support all msg_iovlens in recvmsg and sendmsg

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The kernel doesn't support msg_iovlens != 1 yet and nothing passes
an amount != 1, but if anyone ever adds support for this they won't
have to worry about ue at least.
This commit is contained in:
Nico Weber 2020-09-18 13:10:59 -04:00 committed by Andreas Kling
parent 29ef65c458
commit 31e7f73aae
Notes: sideshowbarker 2024-07-19 02:20:27 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/31e7f73aaed
Pull-request: https://github.com/SerenityOS/serenity/pull/3537
1 changed files with 21 additions and 15 deletions
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36
DevTools/UserspaceEmulator/Emulator.cpp
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@ -599,24 +599,28 @@ int Emulator::virt$recvmsg(int sockfd, FlatPtr msg_addr, int flags)
msghdr mmu_msg;
mmu().copy_from_vm(&mmu_msg, msg_addr, sizeof(mmu_msg));
if (mmu_msg.msg_iovlen != 1)
return -ENOTSUP; // FIXME: Support this :)
iovec mmu_iov;
mmu().copy_from_vm(&mmu_iov, (FlatPtr)mmu_msg.msg_iov, sizeof(mmu_iov));
auto buffer = ByteBuffer::create_uninitialized(mmu_iov.iov_len);
Vector<iovec, 1> mmu_iovs;
mmu_iovs.resize(mmu_msg.msg_iovlen);
mmu().copy_from_vm(mmu_iovs.data(), (FlatPtr)mmu_msg.msg_iov, mmu_msg.msg_iovlen * sizeof(iovec));
Vector<ByteBuffer, 1> buffers;
Vector<iovec, 1> iovs;
for (const auto& iov : mmu_iovs) {
buffers.append(ByteBuffer::create_uninitialized(iov.iov_len));
iovs.append({ buffers.last().data(), buffers.last().size() });
}
ByteBuffer control_buffer;
if (mmu_msg.msg_control)
control_buffer = ByteBuffer::create_uninitialized(mmu_msg.msg_controllen);
sockaddr_storage addr;
iovec iov = { buffer.data(), buffer.size() };
msghdr msg = { &addr, sizeof(addr), &iov, 1, mmu_msg.msg_control ? control_buffer.data() : nullptr, mmu_msg.msg_controllen, mmu_msg.msg_flags };
msghdr msg = { &addr, sizeof(addr), iovs.data(), (int)iovs.size(), mmu_msg.msg_control ? control_buffer.data() : nullptr, mmu_msg.msg_controllen, mmu_msg.msg_flags };
int rc = recvmsg(sockfd, &msg, flags);
if (rc < 0)
return -errno;
mmu().copy_to_vm((FlatPtr)mmu_iov.iov_base, buffer.data(), mmu_iov.iov_len);
for (size_t i = 0; i < buffers.size(); ++i)
mmu().copy_to_vm((FlatPtr)mmu_iovs[i].iov_base, buffers[i].data(), mmu_iovs[i].iov_len);
if (mmu_msg.msg_name)
mmu().copy_to_vm((FlatPtr)mmu_msg.msg_name, &addr, min(sizeof(addr), (size_t)mmu_msg.msg_namelen));
@ -634,11 +638,14 @@ int Emulator::virt$sendmsg(int sockfd, FlatPtr msg_addr, int flags)
msghdr mmu_msg;
mmu().copy_from_vm(&mmu_msg, msg_addr, sizeof(mmu_msg));
if (mmu_msg.msg_iovlen != 1)
return -ENOTSUP; // FIXME: Support this :)
iovec mmu_iov;
mmu().copy_from_vm(&mmu_iov, (FlatPtr)mmu_msg.msg_iov, sizeof(mmu_iov));
auto buffer = mmu().copy_buffer_from_vm((FlatPtr)mmu_iov.iov_base, mmu_iov.iov_len);
Vector<iovec, 1> iovs;
iovs.resize(mmu_msg.msg_iovlen);
mmu().copy_from_vm(iovs.data(), (FlatPtr)mmu_msg.msg_iov, mmu_msg.msg_iovlen * sizeof(iovec));
Vector<ByteBuffer, 1> buffers;
for (auto& iov : iovs) {
buffers.append(mmu().copy_buffer_from_vm((FlatPtr)iov.iov_base, iov.iov_len));
iov = { buffers.last().data(), buffers.last().size() };
}
ByteBuffer control_buffer;
if (mmu_msg.msg_control)
@ -651,8 +658,7 @@ int Emulator::virt$sendmsg(int sockfd, FlatPtr msg_addr, int flags)
mmu().copy_from_vm(&address, (FlatPtr)mmu_msg.msg_name, address_length);
}
iovec iov = { buffer.data(), buffer.size() };
msghdr msg = { mmu_msg.msg_name ? &address : nullptr, address_length, &iov, 1, mmu_msg.msg_control ? control_buffer.data() : nullptr, mmu_msg.msg_controllen, mmu_msg.msg_flags };
msghdr msg = { mmu_msg.msg_name ? &address : nullptr, address_length, iovs.data(), (int)iovs.size(), mmu_msg.msg_control ? control_buffer.data() : nullptr, mmu_msg.msg_controllen, mmu_msg.msg_flags };
return sendmsg(sockfd, &msg, flags);
}