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// Copyright 2020 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package host
import (
"bufio"
"bytes"
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
)
func init() {
machineInfoFuncs = []machineInfoFunc{
{"CPU Info", readCPUInfo},
{"KVM", readKVMInfo},
}
machineModulesInfo = getModulesInfo
machineGlobsInfo = getGlobsInfo
}
func readCPUInfo(buffer *bytes.Buffer) error {
file, err := os.Open("/proc/cpuinfo")
if err != nil {
return err
}
defer file.Close()
scanner := bufio.NewScanner(file)
scanCPUInfo(buffer, scanner)
return nil
}
func scanCPUInfo(buffer *bytes.Buffer, scanner *bufio.Scanner) {
keyIndices := make(map[string]int)
type keyValues struct {
key string
values []string
}
var info []keyValues
for scanner.Scan() {
splitted := strings.Split(scanner.Text(), ":")
if len(splitted) != 2 {
continue
}
key := strings.TrimSpace(splitted[0])
val := strings.TrimSpace(splitted[1])
if idx, ok := keyIndices[key]; !ok {
idx = len(keyIndices)
keyIndices[key] = idx
info = append(info, keyValues{key, []string{val}})
} else {
info[idx].values = append(info[idx].values, val)
}
}
for _, kv := range info {
// It is guaranteed that len(vals) >= 1
key := kv.key
vals := kv.values
if allEqual(vals) {
fmt.Fprintf(buffer, "%-20s: %s\n", key, vals[0])
} else {
fmt.Fprintf(buffer, "%-20s: %s\n", key, strings.Join(vals, ", "))
}
}
}
func allEqual(slice []string) bool {
if len(slice) == 0 {
return true
}
for i := 1; i < len(slice); i++ {
if slice[i] != slice[0] {
return false
}
}
return true
}
func readKVMInfo(buffer *bytes.Buffer) error {
files, err := os.ReadDir("/sys/module/")
if err != nil {
return err
}
for _, file := range files {
name := file.Name()
if !strings.HasPrefix(name, "kvm") {
continue
}
paramPath := filepath.Join("/sys", "module", name, "parameters")
params, err := os.ReadDir(paramPath)
if err != nil {
if os.IsNotExist(err) {
continue
}
return err
}
if len(params) == 0 {
continue
}
fmt.Fprintf(buffer, "/sys/module/%s:\n", name)
for _, key := range params {
keyName := key.Name()
data, err := os.ReadFile(filepath.Join(paramPath, keyName))
if err != nil {
return err
}
fmt.Fprintf(buffer, "\t%s: ", keyName)
buffer.Write(data)
}
buffer.WriteByte('\n')
}
return nil
}
func getModuleTextAddr(moduleName string) (uint64, error) {
addrPath := filepath.Join("/sys", "module", moduleName, "sections", ".text")
addrContent, err := os.ReadFile(addrPath)
if err != nil {
return 0, fmt.Errorf("could not read module .text address file: %w", err)
}
addrString := strings.TrimSpace(string(addrContent))
addr, err := strconv.ParseUint(addrString, 0, 64)
if err != nil {
return 0, fmt.Errorf("address parsing error in %v: %w", moduleName, err)
}
return addr, nil
}
func getModulesInfo() ([]KernelModule, error) {
var modules []KernelModule
re := regexp.MustCompile(`(\w+) ([0-9]+) .*(0[x|X][a-fA-F0-9]+)[^\n]*`)
modulesText, _ := os.ReadFile("/proc/modules")
for _, m := range re.FindAllSubmatch(modulesText, -1) {
name := string(m[1])
modAddr, err := strconv.ParseUint(string(m[3]), 0, 64)
if err != nil {
// /proc/modules is broken, bail out.
return nil, fmt.Errorf("address parsing error in /proc/modules: %w", err)
}
textAddr, err := getModuleTextAddr(name)
if err != nil {
// Module address unavailable, .text is probably 0. Skip this module.
continue
}
modSize, err := strconv.ParseUint(string(m[2]), 0, 64)
if err != nil {
// /proc/modules is broken, bail out.
return nil, fmt.Errorf("module size parsing error in /proc/modules: %w", err)
}
offset := modAddr - textAddr
modules = append(modules, KernelModule{
Name: string(m[1]),
Addr: textAddr,
Size: modSize - offset,
})
}
return modules, nil
}
func getGlobsInfo(globs map[string]bool) (map[string][]string, error) {
var err error
files := make(map[string][]string, len(globs))
for glob := range globs {
var (
addglobs []string
subglobs []string
matches []string
)
tokens := strings.Split(glob, ":")
for _, tok := range tokens {
if strings.HasPrefix(tok, "-") {
subglobs = append(subglobs, tok[1:])
} else {
addglobs = append(addglobs, tok)
}
}
for _, g := range addglobs {
m, err := filepath.Glob(g)
if err != nil {
return nil, err
}
matches = append(matches, m...)
}
files[glob], err = excludeGlobs(removeDupValues(matches), subglobs)
if err != nil {
return nil, err
}
}
return files, nil
}
func excludeGlobs(items, subglobs []string) ([]string, error) {
var results []string
excludes := make(map[string]bool)
for _, glob := range subglobs {
matches, err := filepath.Glob(glob)
if err != nil {
return nil, err
}
for _, m := range matches {
excludes[m] = true
}
}
for _, item := range items {
if !excludes[item] {
results = append(results, item)
}
}
return results, nil
}
func removeDupValues(slice []string) []string {
keys := make(map[string]bool)
list := []string{}
for _, entry := range slice {
if !keys[entry] {
keys[entry] = true
list = append(list, entry)
}
}
return list
}
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