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https://github.com/seaweedfs/seaweedfs.git
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Fix FUSE server buffer leaks in file gaps (#3472)
* Fix FUSE server buffer leaks in file gaps This change zeros read buffers when encountering file gaps during file/chunk reads in FUSE mounts. It prevents leaking internal buffers of the FUSE server which could otherwise reveal metadata, directory listings, file contents and other data related to FUSE API calls. The issue was that buffers are reused, but when a file gap was found the buffer was not zeroed accordingly and the existing data of the buffer was kept and returned. * Move zero logic into its own method
This commit is contained in:
Patrick Schmidt
GitHub
parent
c7892bc7c4
commit
3f758820c1
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@ -127,10 +127,11 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
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nextChunks = c.chunkViews[i+1:]
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}
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if startOffset < chunk.LogicOffset {
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gap := int(chunk.LogicOffset - startOffset)
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gap := chunk.LogicOffset - startOffset
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glog.V(4).Infof("zero [%d,%d)", startOffset, chunk.LogicOffset)
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n += int(min(int64(gap), remaining))
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startOffset, remaining = chunk.LogicOffset, remaining-int64(gap)
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c.zero(p, startOffset-offset, gap)
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n += int(min(gap, remaining))
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startOffset, remaining = chunk.LogicOffset, remaining-gap
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if remaining <= 0 {
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break
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}
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@ -154,10 +155,19 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
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// glog.V(4).Infof("doReadAt [%d,%d), n:%v, err:%v", offset, offset+int64(len(p)), n, err)
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if err == nil && remaining > 0 && c.fileSize > startOffset {
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delta := int(min(remaining, c.fileSize-startOffset))
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glog.V(4).Infof("zero2 [%d,%d) of file size %d bytes", startOffset, startOffset+int64(delta), c.fileSize)
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n += delta
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// zero the remaining bytes if a gap exists at the end of the last chunk (or a fully sparse file)
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if err == nil && remaining > 0 {
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var delta int64
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if c.fileSize > startOffset {
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delta = min(remaining, c.fileSize-startOffset)
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startOffset -= offset
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} else {
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delta = remaining
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startOffset = max(startOffset-offset, startOffset-remaining-offset)
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}
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glog.V(4).Infof("zero2 [%d,%d) of file size %d bytes", startOffset, startOffset+delta, c.fileSize)
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c.zero(p, startOffset, delta)
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n += int(delta)
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}
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if err == nil && offset+int64(len(p)) >= c.fileSize {
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@ -195,3 +205,12 @@ func (c *ChunkReadAt) readChunkSliceAt(buffer []byte, chunkView *ChunkView, next
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c.lastChunkFid = chunkView.FileId
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return
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}
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func (c *ChunkReadAt) zero(buffer []byte, start, length int64) {
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end := min(start+length, int64(len(buffer)))
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// zero the bytes
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for o := start; o < end; o++ {
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buffer[o] = 0
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}
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}
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@ -1,7 +1,7 @@
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package filer
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import (
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"fmt"
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"bytes"
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"io"
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"math"
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"strconv"
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@ -75,29 +75,28 @@ func TestReaderAt(t *testing.T) {
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readerPattern: NewReaderPattern(),
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}
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testReadAt(t, readerAt, 0, 10, 10, io.EOF)
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testReadAt(t, readerAt, 0, 12, 10, io.EOF)
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testReadAt(t, readerAt, 2, 8, 8, io.EOF)
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testReadAt(t, readerAt, 3, 6, 6, nil)
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testReadAt(t, readerAt, 0, 10, 10, io.EOF, nil, nil)
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testReadAt(t, readerAt, 0, 12, 12, io.EOF, nil, nil)
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testReadAt(t, readerAt, 2, 8, 8, io.EOF, nil, nil)
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testReadAt(t, readerAt, 3, 6, 6, nil, nil, nil)
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}
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func testReadAt(t *testing.T, readerAt *ChunkReadAt, offset int64, size int, expected int, expectedErr error) {
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data := make([]byte, size)
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func testReadAt(t *testing.T, readerAt *ChunkReadAt, offset int64, size int, expectedN int, expectedErr error, data, expectedData []byte) {
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if data == nil {
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data = make([]byte, size)
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}
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n, err := readerAt.doReadAt(data, offset)
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for _, d := range data {
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fmt.Printf("%x", d)
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}
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fmt.Println()
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if expected != n {
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t.Errorf("unexpected read size: %d, expect: %d", n, expected)
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if expectedN != n {
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t.Errorf("unexpected read size: %d, expect: %d", n, expectedN)
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}
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if err != expectedErr {
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t.Errorf("unexpected read error: %v, expect: %v", err, expectedErr)
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}
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if expectedData != nil && !bytes.Equal(data, expectedData) {
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t.Errorf("unexpected read data: %v, expect: %v", data, expectedData)
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}
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}
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func TestReaderAt0(t *testing.T) {
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@ -125,12 +124,12 @@ func TestReaderAt0(t *testing.T) {
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readerPattern: NewReaderPattern(),
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}
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testReadAt(t, readerAt, 0, 10, 10, io.EOF)
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testReadAt(t, readerAt, 3, 16, 7, io.EOF)
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testReadAt(t, readerAt, 3, 5, 5, nil)
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testReadAt(t, readerAt, 0, 10, 10, io.EOF, nil, nil)
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testReadAt(t, readerAt, 3, 16, 7, io.EOF, nil, nil)
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testReadAt(t, readerAt, 3, 5, 5, nil, nil, nil)
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testReadAt(t, readerAt, 11, 5, 0, io.EOF)
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testReadAt(t, readerAt, 10, 5, 0, io.EOF)
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testReadAt(t, readerAt, 11, 5, 5, io.EOF, nil, nil)
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testReadAt(t, readerAt, 10, 5, 5, io.EOF, nil, nil)
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}
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@ -153,13 +152,54 @@ func TestReaderAt1(t *testing.T) {
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readerPattern: NewReaderPattern(),
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}
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testReadAt(t, readerAt, 0, 20, 20, io.EOF)
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testReadAt(t, readerAt, 1, 7, 7, nil)
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testReadAt(t, readerAt, 0, 1, 1, nil)
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testReadAt(t, readerAt, 18, 4, 2, io.EOF)
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testReadAt(t, readerAt, 12, 4, 4, nil)
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testReadAt(t, readerAt, 4, 20, 16, io.EOF)
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testReadAt(t, readerAt, 4, 10, 10, nil)
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testReadAt(t, readerAt, 1, 10, 10, nil)
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testReadAt(t, readerAt, 0, 20, 20, io.EOF, nil, nil)
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testReadAt(t, readerAt, 1, 7, 7, nil, nil, nil)
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testReadAt(t, readerAt, 0, 1, 1, nil, nil, nil)
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testReadAt(t, readerAt, 18, 4, 2, io.EOF, nil, nil)
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testReadAt(t, readerAt, 12, 4, 4, nil, nil, nil)
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testReadAt(t, readerAt, 4, 20, 16, io.EOF, nil, nil)
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testReadAt(t, readerAt, 4, 10, 10, nil, nil, nil)
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testReadAt(t, readerAt, 1, 10, 10, nil, nil, nil)
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}
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func TestReaderAtGappedChunksDoNotLeak(t *testing.T) {
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visibles := []VisibleInterval{
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{
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start: 2,
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stop: 3,
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fileId: "1",
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chunkSize: 5,
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},
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{
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start: 7,
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stop: 9,
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fileId: "1",
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chunkSize: 4,
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},
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}
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readerAt := &ChunkReadAt{
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chunkViews: ViewFromVisibleIntervals(visibles, 0, math.MaxInt64),
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readerLock: sync.Mutex{},
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fileSize: 9,
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readerCache: newReaderCache(3, &mockChunkCache{}, nil),
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readerPattern: NewReaderPattern(),
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}
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testReadAt(t, readerAt, 0, 9, 9, io.EOF, []byte{2, 2, 2, 2, 2, 2, 2, 2, 2}, []byte{0, 0, 1, 0, 0, 0, 0, 1, 1})
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testReadAt(t, readerAt, 1, 8, 8, io.EOF, []byte{2, 2, 2, 2, 2, 2, 2, 2}, []byte{0, 1, 0, 0, 0, 0, 1, 1})
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}
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func TestReaderAtSparseFileDoesNotLeak(t *testing.T) {
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readerAt := &ChunkReadAt{
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chunkViews: ViewFromVisibleIntervals([]VisibleInterval{}, 0, math.MaxInt64),
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readerLock: sync.Mutex{},
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fileSize: 3,
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readerCache: newReaderCache(3, &mockChunkCache{}, nil),
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readerPattern: NewReaderPattern(),
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}
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testReadAt(t, readerAt, 0, 3, 3, io.EOF, []byte{2, 2, 2}, []byte{0, 0, 0})
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testReadAt(t, readerAt, 1, 2, 2, io.EOF, []byte{2, 2}, []byte{0, 0})
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}
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