mirror of
https://github.com/restic/restic.git
synced 2024-08-21 20:03:23 +02:00
513 lines
9.7 KiB
Go
513 lines
9.7 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package bpf_test
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import (
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"testing"
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"golang.org/x/net/bpf"
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)
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func TestVMALUOpAdd(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpAdd,
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Val: 3,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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8, 2, 3,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 3, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpSub(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.TAX{},
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bpf.ALUOpX{
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Op: bpf.ALUOpSub,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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1, 2, 3,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 0, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpMul(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpMul,
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Val: 2,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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6, 2, 3, 4,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 4, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpDiv(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpDiv,
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Val: 2,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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20, 2, 3, 4,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 2, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpDivByZeroALUOpConstant(t *testing.T) {
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_, _, err := testVM(t, []bpf.Instruction{
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bpf.ALUOpConstant{
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Op: bpf.ALUOpDiv,
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Val: 0,
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},
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bpf.RetA{},
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})
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if errStr(err) != "cannot divide by zero using ALUOpConstant" {
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t.Fatalf("unexpected error: %v", err)
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}
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}
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func TestVMALUOpDivByZeroALUOpX(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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// Load byte 0 into X
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.TAX{},
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// Load byte 1 into A
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bpf.LoadAbsolute{
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Off: 9,
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Size: 1,
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},
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// Attempt to perform 1/0
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bpf.ALUOpX{
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Op: bpf.ALUOpDiv,
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},
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// Return 4 bytes if program does not terminate
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bpf.LoadConstant{
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Val: 12,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0, 1, 3, 4,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 0, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpOr(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 2,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpOr,
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Val: 0x01,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0x00, 0x10, 0x03, 0x04,
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0x05, 0x06, 0x07, 0x08,
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0x09, 0xff,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 9, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpAnd(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 2,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpAnd,
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Val: 0x0019,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0xaa, 0x09,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 1, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpShiftLeft(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpShiftLeft,
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Val: 0x01,
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},
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bpf.JumpIf{
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Cond: bpf.JumpEqual,
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Val: 0x02,
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SkipTrue: 1,
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},
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bpf.RetConstant{
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Val: 0,
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},
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bpf.RetConstant{
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Val: 9,
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},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0x01, 0xaa,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 1, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpShiftRight(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpShiftRight,
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Val: 0x01,
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},
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bpf.JumpIf{
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Cond: bpf.JumpEqual,
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Val: 0x04,
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SkipTrue: 1,
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},
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bpf.RetConstant{
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Val: 0,
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},
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bpf.RetConstant{
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Val: 9,
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},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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0x08, 0xff, 0xff,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 1, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpMod(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpMod,
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Val: 20,
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},
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bpf.RetA{},
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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out, err := vm.Run([]byte{
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0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
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30, 0, 0,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 2, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpModByZeroALUOpConstant(t *testing.T) {
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_, _, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.ALUOpConstant{
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Op: bpf.ALUOpMod,
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Val: 0,
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},
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bpf.RetA{},
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})
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if errStr(err) != "cannot divide by zero using ALUOpConstant" {
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t.Fatalf("unexpected error: %v", err)
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}
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}
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func TestVMALUOpModByZeroALUOpX(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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// Load byte 0 into X
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bpf.LoadAbsolute{
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Off: 8,
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Size: 1,
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},
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bpf.TAX{},
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// Load byte 1 into A
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bpf.LoadAbsolute{
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Off: 9,
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Size: 1,
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},
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// Attempt to perform 1%0
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bpf.ALUOpX{
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Op: bpf.ALUOpMod,
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},
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// Return 4 bytes if program does not terminate
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bpf.LoadConstant{
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Val: 12,
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|
},
|
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bpf.RetA{},
|
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})
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if err != nil {
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t.Fatalf("failed to load BPF program: %v", err)
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}
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defer done()
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|
|
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out, err := vm.Run([]byte{
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|
0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff,
|
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0, 1, 3, 4,
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})
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if err != nil {
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t.Fatalf("unexpected error while running program: %v", err)
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}
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if want, got := 0, out; want != got {
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t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
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want, got)
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}
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}
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func TestVMALUOpXor(t *testing.T) {
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vm, done, err := testVM(t, []bpf.Instruction{
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bpf.LoadAbsolute{
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|
Off: 8,
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|
Size: 1,
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},
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bpf.ALUOpConstant{
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|
Op: bpf.ALUOpXor,
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Val: 0x0a,
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},
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bpf.JumpIf{
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Cond: bpf.JumpEqual,
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Val: 0x01,
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SkipTrue: 1,
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},
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bpf.RetConstant{
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Val: 0,
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},
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bpf.RetConstant{
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Val: 9,
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},
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})
|
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|
if err != nil {
|
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|
t.Fatalf("failed to load BPF program: %v", err)
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|
}
|
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defer done()
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|
|
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out, err := vm.Run([]byte{
|
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|
0xff, 0xff, 0xff, 0xff,
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|
0xff, 0xff, 0xff, 0xff,
|
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|
0x0b, 0x00, 0x00, 0x00,
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})
|
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|
if err != nil {
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||
|
t.Fatalf("unexpected error while running program: %v", err)
|
||
|
}
|
||
|
if want, got := 1, out; want != got {
|
||
|
t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
|
||
|
want, got)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestVMALUOpUnknown(t *testing.T) {
|
||
|
vm, done, err := testVM(t, []bpf.Instruction{
|
||
|
bpf.LoadAbsolute{
|
||
|
Off: 8,
|
||
|
Size: 1,
|
||
|
},
|
||
|
bpf.ALUOpConstant{
|
||
|
Op: bpf.ALUOpAdd,
|
||
|
Val: 1,
|
||
|
},
|
||
|
// Verify that an unknown operation is a no-op
|
||
|
bpf.ALUOpConstant{
|
||
|
Op: 100,
|
||
|
},
|
||
|
bpf.JumpIf{
|
||
|
Cond: bpf.JumpEqual,
|
||
|
Val: 0x02,
|
||
|
SkipTrue: 1,
|
||
|
},
|
||
|
bpf.RetConstant{
|
||
|
Val: 0,
|
||
|
},
|
||
|
bpf.RetConstant{
|
||
|
Val: 9,
|
||
|
},
|
||
|
})
|
||
|
if err != nil {
|
||
|
t.Fatalf("failed to load BPF program: %v", err)
|
||
|
}
|
||
|
defer done()
|
||
|
|
||
|
out, err := vm.Run([]byte{
|
||
|
0xff, 0xff, 0xff, 0xff,
|
||
|
0xff, 0xff, 0xff, 0xff,
|
||
|
1,
|
||
|
})
|
||
|
if err != nil {
|
||
|
t.Fatalf("unexpected error while running program: %v", err)
|
||
|
}
|
||
|
if want, got := 1, out; want != got {
|
||
|
t.Fatalf("unexpected number of output bytes:\n- want: %d\n- got: %d",
|
||
|
want, got)
|
||
|
}
|
||
|
}
|