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
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pkg/cpuid/native_amd64.go
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pkg/cpuid/native_amd64.go
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// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build amd64
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// +build amd64
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package cpuid
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import (
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"bufio"
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"bytes"
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"os"
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"strconv"
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"github.com/sagernet/gvisor/pkg/log"
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)
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// cpuididFunction is a useful type wrapper. The format is eax | (ecx << 32).
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type cpuidFunction uint64
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func (f cpuidFunction) eax() uint32 {
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return uint32(f)
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}
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func (f cpuidFunction) ecx() uint32 {
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return uint32(f >> 32)
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}
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// The constants below are the lower or "standard" cpuid functions, ordered as
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// defined by the hardware. Note that these may not be included in the standard
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// set of functions that we are allowed to execute, which are filtered in the
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// Native.Query function defined below.
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const (
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vendorID cpuidFunction = 0x0 // Returns vendor ID and largest standard function.
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featureInfo cpuidFunction = 0x1 // Returns basic feature bits and processor signature.
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intelCacheDescriptors cpuidFunction = 0x2 // Returns list of cache descriptors. Intel only.
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intelSerialNumber cpuidFunction = 0x3 // Returns processor serial number (obsolete on new hardware). Intel only.
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intelDeterministicCacheParams cpuidFunction = 0x4 // Returns deterministic cache information. Intel only.
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monitorMwaitParams cpuidFunction = 0x5 // Returns information about monitor/mwait instructions.
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powerParams cpuidFunction = 0x6 // Returns information about power management and thermal sensors.
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extendedFeatureInfo cpuidFunction = 0x7 // Returns extended feature bits.
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_ // Function 0x8 is reserved.
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intelDCAParams cpuidFunction = 0x9 // Returns direct cache access information. Intel only.
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intelPMCInfo cpuidFunction = 0xa // Returns information about performance monitoring features. Intel only.
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intelX2APICInfo cpuidFunction = 0xb // Returns core/logical processor topology. Intel only.
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_ // Function 0xc is reserved.
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xSaveInfo cpuidFunction = 0xd // Returns information about extended state management.
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xSaveInfoSub cpuidFunction = 0xd | (0x1 << 32) // Returns information about extended state management (Sub-leaf).
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)
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const xSaveInfoNumLeaves = 64 // Maximum number of xSaveInfo leaves.
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// The "extended" functions.
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const (
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extendedStart cpuidFunction = 0x80000000
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extendedFunctionInfo cpuidFunction = extendedStart + 0 // Returns highest available extended function in eax.
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extendedFeatures = extendedStart + 1 // Returns some extended feature bits in edx and ecx.
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processorBrandString2 = extendedStart + 2 // Processor Name String Identifier.
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processorBrandString3 = extendedStart + 3 // Processor Name String Identifier.
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processorBrandString4 = extendedStart + 4 // Processor Name String Identifier.
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l1CacheAndTLBInfo = extendedStart + 5 // Returns L2 cache information.
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l2CacheInfo = extendedStart + 6 // Returns L2 cache information.
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addressSizes = extendedStart + 8 // Physical and virtual address sizes.
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)
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var allowedBasicFunctions = [...]bool{
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vendorID: true,
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featureInfo: true,
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extendedFeatureInfo: true,
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intelCacheDescriptors: true,
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intelDeterministicCacheParams: true,
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xSaveInfo: true,
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}
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var allowedExtendedFunctions = [...]bool{
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extendedFunctionInfo - extendedStart: true,
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extendedFeatures - extendedStart: true,
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addressSizes - extendedStart: true,
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processorBrandString2 - extendedStart: true,
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processorBrandString3 - extendedStart: true,
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processorBrandString4 - extendedStart: true,
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l1CacheAndTLBInfo - extendedStart: true,
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l2CacheInfo - extendedStart: true,
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}
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// Function executes a CPUID function.
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//
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// This is typically the native function or a Static definition.
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type Function interface {
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Query(In) Out
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}
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// Native is a native Function.
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//
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// This implements Function.
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type Native struct{}
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// In is input to the Query function.
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//
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// +stateify savable
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type In struct {
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Eax uint32
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Ecx uint32
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}
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// normalize drops irrelevant Ecx values.
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func (i *In) normalize() {
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switch cpuidFunction(i.Eax) {
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case vendorID, featureInfo, intelCacheDescriptors, extendedFunctionInfo, extendedFeatures:
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i.Ecx = 0 // Ignore.
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case processorBrandString2, processorBrandString3, processorBrandString4, l1CacheAndTLBInfo, l2CacheInfo:
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i.Ecx = 0 // Ignore.
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case intelDeterministicCacheParams, extendedFeatureInfo:
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// Preserve i.Ecx.
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}
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}
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// Out is output from the Query function.
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//
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// +stateify savable
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type Out struct {
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Eax uint32
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Ebx uint32
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Ecx uint32
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Edx uint32
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}
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// native is the native Query function.
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func native(In) Out
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// Query executes CPUID natively.
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//
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// This implements Function.
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//
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//go:nosplit
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func (*Native) Query(in In) Out {
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if int(in.Eax) < len(allowedBasicFunctions) && allowedBasicFunctions[in.Eax] {
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return native(in)
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} else if in.Eax >= uint32(extendedStart) {
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if l := int(in.Eax - uint32(extendedStart)); l < len(allowedExtendedFunctions) && allowedExtendedFunctions[l] {
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return native(in)
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}
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}
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return Out{} // All zeros.
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}
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// query is a internal wrapper.
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//
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//go:nosplit
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func (fs FeatureSet) query(fn cpuidFunction) (uint32, uint32, uint32, uint32) {
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out := fs.Query(In{Eax: fn.eax(), Ecx: fn.ecx()})
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return out.Eax, out.Ebx, out.Ecx, out.Edx
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}
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// Intersect returns the intersection of features between self and allowedFeatures.
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func (fs FeatureSet) Intersect(allowedFeatures map[Feature]struct{}) (FeatureSet, error) {
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hs := fs.ToStatic()
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// only keep features inside allowedFeatures.
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for f := range allFeatures {
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if fs.HasFeature(f) {
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if _, ok := allowedFeatures[f]; !ok {
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log.Infof("Removing CPU feature %v as it is not allowed.", f)
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hs.Remove(f)
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}
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}
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}
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return hs.ToFeatureSet(), nil
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}
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var hostFeatureSet FeatureSet
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// HostFeatureSet returns a host CPUID.
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//
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//go:nosplit
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func HostFeatureSet() FeatureSet {
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return hostFeatureSet
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}
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// cpuFreqMHz is the native CPU frequency.
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var cpuFreqMHz float64
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// Reads max cpu frequency from host /proc/cpuinfo. Must run before syscall
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// filter installation. This value is used to create the fake /proc/cpuinfo
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// from a FeatureSet.
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func readMaxCPUFreq() {
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cpuinfoFile, err := os.Open("/proc/cpuinfo")
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if err != nil {
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// Leave it as 0... the VDSO bails out in the same way.
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log.Warningf("Could not open /proc/cpuinfo: %v", err)
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return
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}
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defer cpuinfoFile.Close()
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// We get the value straight from host /proc/cpuinfo. On machines with
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// frequency scaling enabled, this will only get the current value
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// which will likely be inaccurate. This is fine on machines with
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// frequency scaling disabled.
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s := bufio.NewScanner(cpuinfoFile)
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for s.Scan() {
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line := s.Bytes()
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if bytes.Contains(line, []byte("cpu MHz")) {
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splitMHz := bytes.Split(line, []byte(":"))
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if len(splitMHz) < 2 {
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log.Warningf("Could not parse /proc/cpuinfo: malformed cpu MHz line: %q", line)
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return
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}
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var err error
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splitMHzStr := string(bytes.TrimSpace(splitMHz[1]))
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f64MHz, err := strconv.ParseFloat(splitMHzStr, 64)
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if err != nil {
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log.Warningf("Could not parse cpu MHz value %q: %v", splitMHzStr, err)
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return
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}
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cpuFreqMHz = f64MHz
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return
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}
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}
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if err := s.Err(); err != nil {
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log.Warningf("Could not read /proc/cpuinfo: %v", err)
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return
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}
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log.Warningf("Could not parse /proc/cpuinfo, it is empty or does not contain cpu MHz")
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}
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// xgetbv reads an extended control register.
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func xgetbv(reg uintptr) uint64
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// archInitialize initializes hostFeatureSet.
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func archInitialize() {
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hostFeatureSet = FeatureSet{
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Function: &Native{},
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}.Fixed()
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readMaxCPUFreq()
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initHWCap()
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}
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