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/hostsyscall/hostsyscall.go

@@ -0,0 +1,45 @@
+// Copyright 2024 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.
+
+//go:build linux
+// +build linux
+
+// Package hostsyscall provides functions like unix.RawSyscall, but without the
+// overhead of multiple stack frame allocations.
+//
+// This is mostly relevant for platform/kvm which needs to execute some function
+// call chains in a go:nosplit environment. Debug builds specifically make using
+// unix.RawSyscall variants infeasible.
+package hostsyscall
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// RawSyscall6 is a copy of runtime.Syscall6.
+func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1 uintptr, errno unix.Errno)
+
+// RawSyscall is a copy of runtime.Syscall6, but only uses the first three arguments.
+func RawSyscall(trap, a1, a2, a3 uintptr) (r1 uintptr, errno unix.Errno)
+
+// Variants of runtime.Syscall6 that use slightly less stack space by only
+// returning errno.
+
+// RawSyscallErrno6 is like RawSyscall6, but only returns errno,
+// and 0 if successful.
+func RawSyscallErrno6(trap, a1, a2, a3, a4, a5, a6 uintptr) unix.Errno
+
+// RawSyscallErrno is like RawSyscall, but only returns errno,
+// and 0 if successful.
+func RawSyscallErrno(trap, a1, a2, a3 uintptr) unix.Errno