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Diffstat (limited to 'pkg/safecopy/safecopy_test.go')
-rw-r--r--pkg/safecopy/safecopy_test.go617
1 files changed, 617 insertions, 0 deletions
diff --git a/pkg/safecopy/safecopy_test.go b/pkg/safecopy/safecopy_test.go
new file mode 100644
index 000000000..5818f7f9b
--- /dev/null
+++ b/pkg/safecopy/safecopy_test.go
@@ -0,0 +1,617 @@
+// 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 := new(struct{ val uint64 })
+ addr := uintptr(unsafe.Pointer(&data.val)) + 1
+ want := AlignmentError{Addr: addr, Alignment: 4}
+ if _, err := SwapUint32(unsafe.Pointer(addr), 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 := new(struct{ val1, val2 uint64 })
+ addr := uintptr(unsafe.Pointer(&data.val1)) + 1
+ want := AlignmentError{Addr: addr, Alignment: 8}
+ if _, err := SwapUint64(unsafe.Pointer(addr), 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 := new(struct{ val uint64 })
+ addr := uintptr(unsafe.Pointer(&data.val)) + 1
+ want := AlignmentError{Addr: addr, Alignment: 4}
+ if _, err := CompareAndSwapUint32(unsafe.Pointer(addr), 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[0])) + pageSize
+ src := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ src := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ src := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ src := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + pageSize
+ dst := unsafe.Pointer(secondPage - uintptr(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[0])) + 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[0])) + 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[0])) + 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[0])) + 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[0])) + 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[0])) + 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 2024-11-02 14:36:49 +0000