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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.
package subsystem
import (
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
func TestExtractor(t *testing.T) {
// Objects used in tests.
fsPath, mmFsPath := "fs/", "mm/fs.c"
extProg, nfsProg, extNfsProg := []byte("ext"), []byte("nfs"), []byte("ext nfs")
all := &Subsystem{Name: "fs"}
fs := &Subsystem{Name: "fs", Parents: []*Subsystem{all}}
ext := &Subsystem{Name: "ext", Parents: []*Subsystem{fs}}
nfs := &Subsystem{Name: "nfs", Parents: []*Subsystem{fs}}
mm := &Subsystem{Name: "mm", Parents: []*Subsystem{all}}
// Tests themselves.
tests := []struct {
name string
crashes []*Crash
want []*Subsystem
}{
{
name: `Make sure it works fine with just a single path`,
crashes: []*Crash{
{
GuiltyPath: fsPath,
},
},
want: []*Subsystem{fs},
},
{
name: `Make sure a child shadows its parent`,
crashes: []*Crash{
{
GuiltyPath: fsPath,
},
{
GuiltyPath: fsPath,
SyzRepro: extProg,
},
},
want: []*Subsystem{ext},
},
{
name: `Reproducers hint at different subsystems`,
crashes: []*Crash{
{
GuiltyPath: fsPath,
},
{
GuiltyPath: fsPath,
SyzRepro: extProg,
},
{
GuiltyPath: fsPath,
SyzRepro: nfsProg,
},
},
want: []*Subsystem{fs},
},
{
name: `One subsystem from reproducers is irrelevant`,
crashes: []*Crash{
{
GuiltyPath: fsPath,
},
{
GuiltyPath: fsPath,
SyzRepro: extProg,
},
{
GuiltyPath: fsPath,
SyzRepro: extNfsProg,
},
},
want: []*Subsystem{ext},
},
{
name: `Reproducer supporting one of guilty paths`,
crashes: []*Crash{
// The guilty paths correspond both to mm and fs.
{
GuiltyPath: mmFsPath,
},
{
GuiltyPath: mmFsPath,
},
{
GuiltyPath: mmFsPath,
},
{
// But one reproducer points clearly to fs.
GuiltyPath: mmFsPath,
SyzRepro: extProg,
},
},
want: []*Subsystem{ext},
},
}
extractor := &Extractor{
raw: &testRawExtractor{
perPath: map[string][]*Subsystem{
fsPath: {fs},
mmFsPath: {mm, fs},
},
perProg: []progSubsystems{
{extProg, []*Subsystem{ext}},
{nfsProg, []*Subsystem{nfs}},
{extNfsProg, []*Subsystem{ext, nfs}},
},
},
}
for _, test := range tests {
ret := extractor.Extract(test.crashes)
assert.ElementsMatch(t, ret, test.want, test.name)
}
}
type testRawExtractor struct {
perPath map[string][]*Subsystem
perProg []progSubsystems
}
type progSubsystems struct {
prog []byte
ret []*Subsystem
}
func (e *testRawExtractor) FromPath(path string) []*Subsystem {
return e.perPath[path]
}
func (e *testRawExtractor) FromProg(progBytes []byte) []*Subsystem {
for _, obj := range e.perProg {
if reflect.DeepEqual(progBytes, obj.prog) {
return obj.ret
}
}
return nil
}
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