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-rw-r--r--pkg/safecopy/safecopy_test.go629
1 files changed, 0 insertions, 629 deletions
diff --git a/pkg/safecopy/safecopy_test.go b/pkg/safecopy/safecopy_test.go
deleted file mode 100644
index 7f7f69d61..000000000
--- a/pkg/safecopy/safecopy_test.go
+++ /dev/null
@@ -1,629 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package safecopy
-
-import (
- "bytes"
- "fmt"
- "io/ioutil"
- "math/rand"
- "os"
- "runtime/debug"
- "syscall"
- "testing"
- "unsafe"
-)
-
-// Size of a page in bytes. Cloned from usermem.PageSize to avoid a circular
-// dependency.
-const pageSize = 4096
-
-func initRandom(b []byte) {
- for i := range b {
- b[i] = byte(rand.Intn(256))
- }
-}
-
-func randBuf(size int) []byte {
- b := make([]byte, size)
- initRandom(b)
- return b
-}
-
-func TestCopyInSuccess(t *testing.T) {
- // Test that CopyIn does not return an error when all pages are accessible.
- const bufLen = 8192
- a := randBuf(bufLen)
- b := make([]byte, bufLen)
-
- n, err := CopyIn(b, unsafe.Pointer(&a[0]))
- if n != bufLen {
- t.Errorf("Unexpected copy length, got %v, want %v", n, bufLen)
- }
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if !bytes.Equal(a, b) {
- t.Errorf("Buffers are not equal when they should be: %v %v", a, b)
- }
-}
-
-func TestCopyOutSuccess(t *testing.T) {
- // Test that CopyOut does not return an error when all pages are
- // accessible.
- const bufLen = 8192
- a := randBuf(bufLen)
- b := make([]byte, bufLen)
-
- n, err := CopyOut(unsafe.Pointer(&b[0]), a)
- if n != bufLen {
- t.Errorf("Unexpected copy length, got %v, want %v", n, bufLen)
- }
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if !bytes.Equal(a, b) {
- t.Errorf("Buffers are not equal when they should be: %v %v", a, b)
- }
-}
-
-func TestCopySuccess(t *testing.T) {
- // Test that Copy does not return an error when all pages are accessible.
- const bufLen = 8192
- a := randBuf(bufLen)
- b := make([]byte, bufLen)
-
- n, err := Copy(unsafe.Pointer(&b[0]), unsafe.Pointer(&a[0]), bufLen)
- if n != bufLen {
- t.Errorf("Unexpected copy length, got %v, want %v", n, bufLen)
- }
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if !bytes.Equal(a, b) {
- t.Errorf("Buffers are not equal when they should be: %v %v", a, b)
- }
-}
-
-func TestZeroOutSuccess(t *testing.T) {
- // Test that ZeroOut does not return an error when all pages are
- // accessible.
- const bufLen = 8192
- a := make([]byte, bufLen)
- b := randBuf(bufLen)
-
- n, err := ZeroOut(unsafe.Pointer(&b[0]), bufLen)
- if n != bufLen {
- t.Errorf("Unexpected copy length, got %v, want %v", n, bufLen)
- }
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if !bytes.Equal(a, b) {
- t.Errorf("Buffers are not equal when they should be: %v %v", a, b)
- }
-}
-
-func TestSwapUint32Success(t *testing.T) {
- // Test that SwapUint32 does not return an error when the page is
- // accessible.
- before := uint32(rand.Int31())
- after := uint32(rand.Int31())
- val := before
-
- old, err := SwapUint32(unsafe.Pointer(&val), after)
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if old != before {
- t.Errorf("Unexpected old value: got %v, want %v", old, before)
- }
- if val != after {
- t.Errorf("Unexpected new value: got %v, want %v", val, after)
- }
-}
-
-func TestSwapUint32AlignmentError(t *testing.T) {
- // Test that SwapUint32 returns an AlignmentError when passed an unaligned
- // address.
- data := make([]byte, 8) // 2 * sizeof(uint32).
- alignedIndex := uintptr(0)
- if offset := uintptr(unsafe.Pointer(&data[0])) % 4; offset != 0 {
- alignedIndex = 4 - offset
- }
- ptr := unsafe.Pointer(&data[alignedIndex+1])
- want := AlignmentError{Addr: uintptr(ptr), Alignment: 4}
- if _, err := SwapUint32(ptr, 1); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
-}
-
-func TestSwapUint64Success(t *testing.T) {
- // Test that SwapUint64 does not return an error when the page is
- // accessible.
- before := uint64(rand.Int63())
- after := uint64(rand.Int63())
- // "The first word in ... an allocated struct or slice can be relied upon
- // to be 64-bit aligned." - sync/atomic docs
- data := new(struct{ val uint64 })
- data.val = before
-
- old, err := SwapUint64(unsafe.Pointer(&data.val), after)
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if old != before {
- t.Errorf("Unexpected old value: got %v, want %v", old, before)
- }
- if data.val != after {
- t.Errorf("Unexpected new value: got %v, want %v", data.val, after)
- }
-}
-
-func TestSwapUint64AlignmentError(t *testing.T) {
- // Test that SwapUint64 returns an AlignmentError when passed an unaligned
- // address.
- data := make([]byte, 16) // 2 * sizeof(uint64).
- alignedIndex := uintptr(0)
- if offset := uintptr(unsafe.Pointer(&data[0])) % 8; offset != 0 {
- alignedIndex = 8 - offset
- }
- ptr := unsafe.Pointer(&data[alignedIndex+1])
- want := AlignmentError{Addr: uintptr(ptr), Alignment: 8}
- if _, err := SwapUint64(ptr, 1); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
-}
-
-func TestCompareAndSwapUint32Success(t *testing.T) {
- // Test that CompareAndSwapUint32 does not return an error when the page is
- // accessible.
- before := uint32(rand.Int31())
- after := uint32(rand.Int31())
- val := before
-
- old, err := CompareAndSwapUint32(unsafe.Pointer(&val), before, after)
- if err != nil {
- t.Errorf("Unexpected error: %v", err)
- }
- if old != before {
- t.Errorf("Unexpected old value: got %v, want %v", old, before)
- }
- if val != after {
- t.Errorf("Unexpected new value: got %v, want %v", val, after)
- }
-}
-
-func TestCompareAndSwapUint32AlignmentError(t *testing.T) {
- // Test that CompareAndSwapUint32 returns an AlignmentError when passed an
- // unaligned address.
- data := make([]byte, 8) // 2 * sizeof(uint32).
- alignedIndex := uintptr(0)
- if offset := uintptr(unsafe.Pointer(&data[0])) % 4; offset != 0 {
- alignedIndex = 4 - offset
- }
- ptr := unsafe.Pointer(&data[alignedIndex+1])
- want := AlignmentError{Addr: uintptr(ptr), Alignment: 4}
- if _, err := CompareAndSwapUint32(ptr, 0, 1); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
-}
-
-// withSegvErrorTestMapping calls fn with a two-page mapping. The first page
-// contains random data, and the second page generates SIGSEGV when accessed.
-func withSegvErrorTestMapping(t *testing.T, fn func(m []byte)) {
- mapping, err := syscall.Mmap(-1, 0, 2*pageSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE)
- if err != nil {
- t.Fatalf("Mmap failed: %v", err)
- }
- defer syscall.Munmap(mapping)
- if err := syscall.Mprotect(mapping[pageSize:], syscall.PROT_NONE); err != nil {
- t.Fatalf("Mprotect failed: %v", err)
- }
- initRandom(mapping[:pageSize])
-
- fn(mapping)
-}
-
-// withBusErrorTestMapping calls fn with a two-page mapping. The first page
-// contains random data, and the second page generates SIGBUS when accessed.
-func withBusErrorTestMapping(t *testing.T, fn func(m []byte)) {
- f, err := ioutil.TempFile("", "sigbus_test")
- if err != nil {
- t.Fatalf("TempFile failed: %v", err)
- }
- defer f.Close()
- if err := f.Truncate(pageSize); err != nil {
- t.Fatalf("Truncate failed: %v", err)
- }
- mapping, err := syscall.Mmap(int(f.Fd()), 0, 2*pageSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
- if err != nil {
- t.Fatalf("Mmap failed: %v", err)
- }
- defer syscall.Munmap(mapping)
- initRandom(mapping[:pageSize])
-
- fn(mapping)
-}
-
-func TestCopyInSegvError(t *testing.T) {
- // Test that CopyIn returns a SegvError when reaching a page that signals
- // SIGSEGV.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- src := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- dst := randBuf(pageSize)
- n, err := CopyIn(dst, src)
- if n != bytesBeforeFault {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := dst[:bytesBeforeFault], mapping[pageSize-bytesBeforeFault:pageSize]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopyInBusError(t *testing.T) {
- // Test that CopyIn returns a BusError when reaching a page that signals
- // SIGBUS.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGBUS", bytesBeforeFault), func(t *testing.T) {
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- src := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- dst := randBuf(pageSize)
- n, err := CopyIn(dst, src)
- if n != bytesBeforeFault {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := dst[:bytesBeforeFault], mapping[pageSize-bytesBeforeFault:pageSize]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopyOutSegvError(t *testing.T) {
- // Test that CopyOut returns a SegvError when reaching a page that signals
- // SIGSEGV.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- src := randBuf(pageSize)
- n, err := CopyOut(dst, src)
- if n != bytesBeforeFault {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], src[:bytesBeforeFault]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopyOutBusError(t *testing.T) {
- // Test that CopyOut returns a BusError when reaching a page that signals
- // SIGBUS.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- src := randBuf(pageSize)
- n, err := CopyOut(dst, src)
- if n != bytesBeforeFault {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], src[:bytesBeforeFault]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopySourceSegvError(t *testing.T) {
- // Test that Copy returns a SegvError when copying from a page that signals
- // SIGSEGV.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- src := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- dst := randBuf(pageSize)
- n, err := Copy(unsafe.Pointer(&dst[0]), src, pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := dst[:bytesBeforeFault], mapping[pageSize-bytesBeforeFault:pageSize]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopySourceBusError(t *testing.T) {
- // Test that Copy returns a BusError when copying from a page that signals
- // SIGBUS.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGBUS", bytesBeforeFault), func(t *testing.T) {
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- src := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- dst := randBuf(pageSize)
- n, err := Copy(unsafe.Pointer(&dst[0]), src, pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := dst[:bytesBeforeFault], mapping[pageSize-bytesBeforeFault:pageSize]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopyDestinationSegvError(t *testing.T) {
- // Test that Copy returns a SegvError when copying to a page that signals
- // SIGSEGV.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- src := randBuf(pageSize)
- n, err := Copy(dst, unsafe.Pointer(&src[0]), pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], src[:bytesBeforeFault]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestCopyDestinationBusError(t *testing.T) {
- // Test that Copy returns a BusError when copying to a page that signals
- // SIGBUS.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting copy %d bytes before SIGBUS", bytesBeforeFault), func(t *testing.T) {
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- src := randBuf(pageSize)
- n, err := Copy(dst, unsafe.Pointer(&src[0]), pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected copy length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], src[:bytesBeforeFault]; !bytes.Equal(got, want) {
- t.Errorf("Buffers are not equal when they should be: %v %v", got, want)
- }
- })
- })
- }
-}
-
-func TestZeroOutSegvError(t *testing.T) {
- // Test that ZeroOut returns a SegvError when reaching a page that signals
- // SIGSEGV.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting write %d bytes before SIGSEGV", bytesBeforeFault), func(t *testing.T) {
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- n, err := ZeroOut(dst, pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected write length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], make([]byte, bytesBeforeFault); !bytes.Equal(got, want) {
- t.Errorf("Non-zero bytes in written part of mapping: %v", got)
- }
- })
- })
- }
-}
-
-func TestZeroOutBusError(t *testing.T) {
- // Test that ZeroOut returns a BusError when reaching a page that signals
- // SIGBUS.
- for bytesBeforeFault := 0; bytesBeforeFault <= 2*maxRegisterSize; bytesBeforeFault++ {
- t.Run(fmt.Sprintf("starting write %d bytes before SIGBUS", bytesBeforeFault), func(t *testing.T) {
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- dst := unsafe.Pointer(&mapping[pageSize-bytesBeforeFault])
- n, err := ZeroOut(dst, pageSize)
- if n != uintptr(bytesBeforeFault) {
- t.Errorf("Unexpected write length: got %v, want %v", n, bytesBeforeFault)
- }
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- if got, want := mapping[pageSize-bytesBeforeFault:pageSize], make([]byte, bytesBeforeFault); !bytes.Equal(got, want) {
- t.Errorf("Non-zero bytes in written part of mapping: %v", got)
- }
- })
- })
- }
-}
-
-func TestSwapUint32SegvError(t *testing.T) {
- // Test that SwapUint32 returns a SegvError when reaching a page that
- // signals SIGSEGV.
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := SwapUint32(unsafe.Pointer(secondPage), 1)
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func TestSwapUint32BusError(t *testing.T) {
- // Test that SwapUint32 returns a BusError when reaching a page that
- // signals SIGBUS.
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := SwapUint32(unsafe.Pointer(secondPage), 1)
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func TestSwapUint64SegvError(t *testing.T) {
- // Test that SwapUint64 returns a SegvError when reaching a page that
- // signals SIGSEGV.
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := SwapUint64(unsafe.Pointer(secondPage), 1)
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func TestSwapUint64BusError(t *testing.T) {
- // Test that SwapUint64 returns a BusError when reaching a page that
- // signals SIGBUS.
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := SwapUint64(unsafe.Pointer(secondPage), 1)
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func TestCompareAndSwapUint32SegvError(t *testing.T) {
- // Test that CompareAndSwapUint32 returns a SegvError when reaching a page
- // that signals SIGSEGV.
- withSegvErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := CompareAndSwapUint32(unsafe.Pointer(secondPage), 0, 1)
- if want := (SegvError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func TestCompareAndSwapUint32BusError(t *testing.T) {
- // Test that CompareAndSwapUint32 returns a BusError when reaching a page
- // that signals SIGBUS.
- withBusErrorTestMapping(t, func(mapping []byte) {
- secondPage := uintptr(unsafe.Pointer(&mapping[pageSize]))
- _, err := CompareAndSwapUint32(unsafe.Pointer(secondPage), 0, 1)
- if want := (BusError{secondPage}); err != want {
- t.Errorf("Unexpected error: got %v, want %v", err, want)
- }
- })
-}
-
-func testCopy(dst, src []byte) (panicked bool) {
- defer func() {
- if r := recover(); r != nil {
- panicked = true
- }
- }()
- debug.SetPanicOnFault(true)
- copy(dst, src)
- return
-}
-
-func TestSegVOnMemmove(t *testing.T) {
- // Test that SIGSEGVs received by runtime.memmove when *not* doing
- // CopyIn or CopyOut work gets propagated to the runtime.
- const bufLen = pageSize
- a, err := syscall.Mmap(-1, 0, bufLen, syscall.PROT_NONE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
- if err != nil {
- t.Fatalf("Mmap failed: %v", err)
-
- }
- defer syscall.Munmap(a)
- b := randBuf(bufLen)
-
- if !testCopy(b, a) {
- t.Fatalf("testCopy didn't panic when it should have")
- }
-
- if !testCopy(a, b) {
- t.Fatalf("testCopy didn't panic when it should have")
- }
-}
-
-func TestSigbusOnMemmove(t *testing.T) {
- // Test that SIGBUS received by runtime.memmove when *not* doing
- // CopyIn or CopyOut work gets propagated to the runtime.
- const bufLen = pageSize
- f, err := ioutil.TempFile("", "sigbus_test")
- if err != nil {
- t.Fatalf("TempFile failed: %v", err)
- }
- os.Remove(f.Name())
- defer f.Close()
-
- a, err := syscall.Mmap(int(f.Fd()), 0, bufLen, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
- if err != nil {
- t.Fatalf("Mmap failed: %v", err)
-
- }
- defer syscall.Munmap(a)
- b := randBuf(bufLen)
-
- if !testCopy(b, a) {
- t.Fatalf("testCopy didn't panic when it should have")
- }
-
- if !testCopy(a, b) {
- t.Fatalf("testCopy didn't panic when it should have")
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 14:34:52 +0000