snapshot: sagernet/gvisor v0.0.0-20250811.0-sing-box-mod.1

Содержимое пина, зафиксированного в go.mod sing-box-lx, одним коммитом
без истории. Полная история SagerNet/gvisor — 1.45 ГБ и клонируется в
каждой CI-джобе; наша дельта — одна вставка в одну функцию, история для
неё не нужна.

Module path github.com/sagernet/gvisor сохранён намеренно: на него
опирается replace-директива суперпроекта.

Патч поверх — отдельным коммитом, чтобы дельта читалась одним git show
и переносилась на новый пин копированием.

SPECS/TASKS/048-GVISOR_HANDSHAKE_NIL_CRASH

pkg/tcpip/transport/udp/endpoint_state.go

@@ -0,0 +1,96 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package udp
+
+import (
+	"context"
+	"time"
+
+	"github.com/sagernet/gvisor/pkg/log"
+	"github.com/sagernet/gvisor/pkg/tcpip"
+	"github.com/sagernet/gvisor/pkg/tcpip/stack"
+	"github.com/sagernet/gvisor/pkg/tcpip/transport"
+)
+
+// saveReceivedAt is invoked by stateify.
+func (p *udpPacket) saveReceivedAt() int64 {
+	return p.receivedAt.UnixNano()
+}
+
+// loadReceivedAt is invoked by stateify.
+func (p *udpPacket) loadReceivedAt(_ context.Context, nsec int64) {
+	p.receivedAt = time.Unix(0, nsec)
+}
+
+// afterLoad is invoked by stateify.
+func (e *endpoint) afterLoad(ctx context.Context) {
+	if e.stack.IsSaveRestoreEnabled() {
+		e.stack.RegisterRestoredEndpoint(e)
+	} else {
+		stack.RestoreStackFromContext(ctx).RegisterRestoredEndpoint(e)
+	}
+}
+
+// beforeSave is invoked by stateify.
+func (e *endpoint) beforeSave() {
+	e.freeze()
+	e.stack.RegisterResumableEndpoint(e)
+}
+
+// Restore implements tcpip.RestoredEndpoint.Restore.
+func (e *endpoint) Restore(s *stack.Stack) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if err := e.net.Resume(s); err != nil {
+		log.Warningf("Closing the UDP endpoint as it cannot be restored, err: %v", err)
+		e.closeLocked()
+		return
+	}
+
+	// Unfreeze the endpoint to handle packets.
+	e.frozen = false
+	if e.stack.IsSaveRestoreEnabled() {
+		e.ops.InitHandler(e, e.stack, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
+		return
+	}
+	e.stack = s
+	e.ops.InitHandler(e, e.stack, tcpip.GetStackSendBufferLimits, tcpip.GetStackReceiveBufferLimits)
+
+	switch state := e.net.State(); state {
+	case transport.DatagramEndpointStateInitial, transport.DatagramEndpointStateClosed:
+	case transport.DatagramEndpointStateBound, transport.DatagramEndpointStateConnected:
+		// Our saved state had a port, but we don't actually have a
+		// reservation. We need to remove the port from our state, but still
+		// pass it to the reservation machinery.
+		var err tcpip.Error
+		id := e.net.Info().ID
+		id.LocalPort = e.localPort
+		id.RemotePort = e.remotePort
+		id, e.boundBindToDevice, err = e.registerWithStack(e.effectiveNetProtos, id)
+		if err != nil {
+			panic("registering udp endpoint with the stack failed during restore")
+		}
+		e.localPort = id.LocalPort
+		e.remotePort = id.RemotePort
+	default:
+		panic("unhandled state")
+	}
+}
+
+// Resume implements tcpip.ResumableEndpoint.Resume.
+func (e *endpoint) Resume() {
+	e.thaw()
+}