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// Copyright 2023 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.
// Tests the translation of coverage pcs between fuzzer instances with differing module offsets.
package cover
import (
"fmt"
"reflect"
"strconv"
"testing"
"github.com/google/syzkaller/pkg/vminfo"
)
type RPCServer struct {
canonicalModules *Canonicalizer
modulesInitialized bool
fuzzers map[string]*Fuzzer
}
type Fuzzer struct {
instModules *CanonicalizerInstance
cov []uint64
goalCov []uint64
bitmap []uint64
goalBitmap []uint64
sign []uint64
goalSign []uint64
}
type canonicalizeValue int
const (
Canonicalize canonicalizeValue = iota
Decanonicalize
)
// Confirms there is no change to coverage if modules aren't instantiated.
func TestNilModules(t *testing.T) {
serv := &RPCServer{
fuzzers: make(map[string]*Fuzzer),
}
serv.connect("f1", nil, true)
serv.connect("f2", nil, true)
serv.fuzzers["f1"].cov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f1"].goalCov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f2"].cov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f1"].bitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f1"].goalBitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f2"].bitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f2"].goalBitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
if err := serv.runTest(Canonicalize); err != "" {
t.Fatalf("failed in canonicalization: %v", err)
}
serv.fuzzers["f1"].goalCov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f1"].goalSign = serv.fuzzers["f1"].goalCov
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f2"].goalSign = serv.fuzzers["f2"].goalCov
if err := serv.runTest(Decanonicalize); err != "" {
t.Fatalf("failed in decanonicalization: %v", err)
}
}
// Confirms there is no change to PCs if coverage is disabled and fallback signals are used.
func TestDisabledSignals(t *testing.T) {
serv := &RPCServer{
fuzzers: make(map[string]*Fuzzer),
}
// Create modules at the specified address offsets.
f1ModuleAddresses := []uint64{0x00015000, 0x00020000, 0x00030000, 0x00040000, 0x00045000}
f1ModuleSizes := []uint64{0x5000, 0x5000, 0x10000, 0x5000, 0x10000}
f1Modules := initModules(f1ModuleAddresses, f1ModuleSizes)
serv.connect("f1", f1Modules, false)
f2ModuleAddresses := []uint64{0x00015000, 0x00040000, 0x00045000, 0x00020000, 0x00030000}
f2ModuleSizes := []uint64{0x5000, 0x5000, 0x10000, 0x5000, 0x10000}
f2Modules := initModules(f2ModuleAddresses, f2ModuleSizes)
serv.connect("f2", f2Modules, false)
pcs := []uint64{0x00010000, 0x00020000, 0x00030000, 0x00040000}
serv.fuzzers["f1"].cov = pcs
serv.fuzzers["f1"].goalCov = pcs
serv.fuzzers["f2"].sign = pcs
serv.fuzzers["f2"].goalSign = pcs
if err := serv.runTest(Canonicalize); err != "" {
t.Fatalf("failed in canonicalization: %v", err)
}
serv.fuzzers["f1"].goalSign = pcs
serv.fuzzers["f2"].goalSign = pcs
if err := serv.runTest(Decanonicalize); err != "" {
t.Fatalf("failed in decanonicalization: %v", err)
}
}
// Tests coverage conversion when modules are instantiated.
func TestModules(t *testing.T) {
serv := &RPCServer{
fuzzers: make(map[string]*Fuzzer),
}
// Create modules at the specified address offsets.
f1ModuleAddresses := []uint64{0x00015000, 0x00020000, 0x00030000, 0x00040000, 0x00045000}
f1ModuleSizes := []uint64{0x5000, 0x5000, 0x10000, 0x5000, 0x10000}
f1Modules := initModules(f1ModuleAddresses, f1ModuleSizes)
serv.connect("f1", f1Modules, true)
f2ModuleAddresses := []uint64{0x00015000, 0x00040000, 0x00045000, 0x00020000, 0x00030000}
f2ModuleSizes := []uint64{0x5000, 0x5000, 0x10000, 0x5000, 0x10000}
f2Modules := initModules(f2ModuleAddresses, f2ModuleSizes)
serv.connect("f2", f2Modules, true)
// f1 is the "canonical" fuzzer as it is first one instantiated.
// This means that all coverage output should be the same as the inputs.
serv.fuzzers["f1"].cov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000, 0x00030000,
0x00035000, 0x00040000, 0x00045000, 0x00050000, 0x00055000}
serv.fuzzers["f1"].goalCov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000, 0x00030000,
0x00035000, 0x00040000, 0x00045000, 0x00050000, 0x00055000}
// The modules addresss are inverted between: (2 and 4), (3 and 5),
// affecting the output canonical coverage values in these ranges.
serv.fuzzers["f2"].cov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000, 0x00030000,
0x00035000, 0x00040000, 0x00045000, 0x00050000, 0x00055000}
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00015000, 0x00040000, 0x00025000, 0x00045000,
0x0004a000, 0x00020000, 0x00030000, 0x0003b000, 0x00055000}
serv.fuzzers["f1"].bitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f1"].goalBitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f2"].bitmap = []uint64{
0x00010011,
0x00020FFF,
0x00030000,
0x00040000,
}
serv.fuzzers["f2"].goalBitmap = []uint64{
0x00010011,
0x00040FFF,
0x00045000,
0x00020000,
}
if err := serv.runTest(Canonicalize); err != "" {
t.Fatalf("failed in canonicalization: %v", err)
}
serv.fuzzers["f1"].goalCov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000, 0x00030000,
0x00035000, 0x00040000, 0x00045000, 0x00050000, 0x00055000}
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000, 0x00030000,
0x00035000, 0x00040000, 0x00045000, 0x00050000, 0x00055000}
if err := serv.runTest(Decanonicalize); err != "" {
t.Fatalf("failed in decanonicalization: %v", err)
}
}
// Tests coverage conversion when modules are added after initialization.
func TestChangingModules(t *testing.T) {
serv := &RPCServer{
fuzzers: make(map[string]*Fuzzer),
}
// Create modules at the specified address offsets.
f1ModuleAddresses := []uint64{0x00015000}
f1ModuleSizes := []uint64{0x5000}
f1Modules := initModules(f1ModuleAddresses, f1ModuleSizes)
serv.connect("f1", f1Modules, true)
f2ModuleAddresses := []uint64{0x00015000, 0x00020000}
f2ModuleSizes := []uint64{0x5000, 0x5000}
f2Modules := initModules(f2ModuleAddresses, f2ModuleSizes)
serv.connect("f2", f2Modules, true)
// Module 2 is not present in the "canonical" fuzzer, so coverage values
// in this range should be deleted.
serv.fuzzers["f2"].cov = []uint64{0x00010000, 0x00015000, 0x00020000, 0x00025000}
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00015000, 0x00025000}
if err := serv.runTest(Canonicalize); err != "" {
t.Fatalf("failed in canonicalization: %v", err)
}
serv.fuzzers["f2"].goalCov = []uint64{0x00010000, 0x00015000, 0x00025000}
if err := serv.runTest(Decanonicalize); err != "" {
t.Fatalf("failed in decanonicalization: %v", err)
}
}
func (serv *RPCServer) runTest(val canonicalizeValue) string {
var cov []uint64
for name, fuzzer := range serv.fuzzers {
if val == Canonicalize {
cov = fuzzer.instModules.Canonicalize(fuzzer.cov)
} else {
cov = fuzzer.instModules.Decanonicalize(fuzzer.cov)
instBitmap := fuzzer.instModules.Decanonicalize(fuzzer.bitmap)
if !reflect.DeepEqual(instBitmap, fuzzer.goalBitmap) {
return fmt.Sprintf("failed in bitmap conversion. Fuzzer %v.\nExpected: 0x%x.\nReturned: 0x%x",
name, fuzzer.goalBitmap, instBitmap)
}
}
if !reflect.DeepEqual(cov, fuzzer.goalCov) {
return fmt.Sprintf("failed in coverage conversion. Fuzzer %v.\nExpected: 0x%x.\nReturned: 0x%x",
name, fuzzer.goalCov, cov)
}
fuzzer.cov = cov
}
return ""
}
func (serv *RPCServer) connect(name string, modules []*vminfo.KernelModule, flagSignal bool) {
if !serv.modulesInitialized {
serv.canonicalModules = NewCanonicalizer(modules, flagSignal)
serv.modulesInitialized = true
}
serv.fuzzers[name] = &Fuzzer{
instModules: serv.canonicalModules.NewInstance(modules),
}
}
func initModules(addrs, sizes []uint64) []*vminfo.KernelModule {
var modules []*vminfo.KernelModule
for idx, addr := range addrs {
modules = append(modules, &vminfo.KernelModule{
Name: strconv.FormatInt(int64(idx), 10),
Addr: addr,
Size: sizes[idx],
})
}
return modules
}
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