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/abi/linux/limits.go

@@ -0,0 +1,88 @@
+// 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 linux
+
+// Resources for getrlimit(2)/setrlimit(2)/prlimit(2).
+const (
+	RLIMIT_CPU        = 0
+	RLIMIT_FSIZE      = 1
+	RLIMIT_DATA       = 2
+	RLIMIT_STACK      = 3
+	RLIMIT_CORE       = 4
+	RLIMIT_RSS        = 5
+	RLIMIT_NPROC      = 6
+	RLIMIT_NOFILE     = 7
+	RLIMIT_MEMLOCK    = 8
+	RLIMIT_AS         = 9
+	RLIMIT_LOCKS      = 10
+	RLIMIT_SIGPENDING = 11
+	RLIMIT_MSGQUEUE   = 12
+	RLIMIT_NICE       = 13
+	RLIMIT_RTPRIO     = 14
+	RLIMIT_RTTIME     = 15
+)
+
+// RLimit corresponds to Linux's struct rlimit.
+type RLimit struct {
+	// Cur specifies the soft limit.
+	Cur uint64
+	// Max specifies the hard limit.
+	Max uint64
+}
+
+const (
+	// RLimInfinity is RLIM_INFINITY on Linux.
+	RLimInfinity = ^uint64(0)
+
+	// DefaultStackSoftLimit is called _STK_LIM in Linux.
+	DefaultStackSoftLimit = 8 * 1024 * 1024
+
+	// DefaultNprocLimit is defined in kernel/fork.c:set_max_threads, and
+	// called MAX_THREADS / 2 in Linux.
+	DefaultNprocLimit = FUTEX_TID_MASK / 2
+
+	// DefaultNofileSoftLimit is called INR_OPEN_CUR in Linux.
+	DefaultNofileSoftLimit = 1024
+
+	// DefaultNofileHardLimit is called INR_OPEN_MAX in Linux.
+	DefaultNofileHardLimit = 4096
+
+	// DefaultMemlockLimit is called MLOCK_LIMIT in Linux.
+	DefaultMemlockLimit = 64 * 1024
+
+	// DefaultMsgqueueLimit is called MQ_BYTES_MAX in Linux.
+	DefaultMsgqueueLimit = 819200
+)
+
+// InitRLimits is a map of initial rlimits set by Linux in
+// include/asm-generic/resource.h.
+var InitRLimits = map[int]RLimit{
+	RLIMIT_CPU:        {RLimInfinity, RLimInfinity},
+	RLIMIT_FSIZE:      {RLimInfinity, RLimInfinity},
+	RLIMIT_DATA:       {RLimInfinity, RLimInfinity},
+	RLIMIT_STACK:      {DefaultStackSoftLimit, RLimInfinity},
+	RLIMIT_CORE:       {0, RLimInfinity},
+	RLIMIT_RSS:        {RLimInfinity, RLimInfinity},
+	RLIMIT_NPROC:      {DefaultNprocLimit, DefaultNprocLimit},
+	RLIMIT_NOFILE:     {DefaultNofileSoftLimit, DefaultNofileHardLimit},
+	RLIMIT_MEMLOCK:    {DefaultMemlockLimit, DefaultMemlockLimit},
+	RLIMIT_AS:         {RLimInfinity, RLimInfinity},
+	RLIMIT_LOCKS:      {RLimInfinity, RLimInfinity},
+	RLIMIT_SIGPENDING: {0, 0},
+	RLIMIT_MSGQUEUE:   {DefaultMsgqueueLimit, DefaultMsgqueueLimit},
+	RLIMIT_NICE:       {0, 0},
+	RLIMIT_RTPRIO:     {0, 0},
+	RLIMIT_RTTIME:     {RLimInfinity, RLimInfinity},
+}