fusefrontend: clamp oversized reads
Our byte cache pools are sized acc. to MAX_KERNEL_WRITE, but the running kernel may have a higher limit set. Clamp to what we can handle. Fixes a panic on a Synology NAS reported at https://github.com/rfjakob/gocryptfs/issues/145
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@ -194,6 +194,8 @@ func (be *ContentEnc) DecryptBlock(ciphertext []byte, blockNo uint64, fileID []b
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const encryptMaxSplit = 2
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// EncryptBlocks is like EncryptBlock but takes multiple plaintext blocks.
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// Returns a byte slice from CReqPool - so don't forget to return it
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// to the pool.
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func (be *ContentEnc) EncryptBlocks(plaintextBlocks [][]byte, firstBlockNo uint64, fileID []byte) []byte {
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ciphertextBlocks := make([][]byte, len(plaintextBlocks))
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// For large writes, we parallelize encryption.
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@ -132,6 +132,8 @@ func (f *file) createHeader() (fileID []byte, err error) {
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return h.ID, err
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}
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var oversizedReadWarn sync.Once
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// doRead - read "length" plaintext bytes from plaintext offset "off" and append
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// to "dst".
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// Arguments "length" and "off" do not have to be block-aligned.
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@ -142,6 +144,16 @@ func (f *file) createHeader() (fileID []byte, err error) {
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// Called by Read() for normal reading,
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// by Write() and Truncate() for Read-Modify-Write
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func (f *file) doRead(dst []byte, off uint64, length uint64) ([]byte, fuse.Status) {
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// Our byte cache pools are sized acc. to MAX_KERNEL_WRITE, but the
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// running kernel may have a higher limit set. Clamp to what we can
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// handle.
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if length > fuse.MAX_KERNEL_WRITE {
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oversizedReadWarn.Do(func() {
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tlog.Warn.Printf("doRead: truncating oversized read: %d to %d bytes",
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length, fuse.MAX_KERNEL_WRITE)
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})
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length = fuse.MAX_KERNEL_WRITE
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}
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// Make sure we have the file ID.
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f.fileTableEntry.HeaderLock.RLock()
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if f.fileTableEntry.ID == nil {
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@ -170,7 +182,8 @@ func (f *file) doRead(dst []byte, off uint64, length uint64) ([]byte, fuse.Statu
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blocks := f.contentEnc.ExplodePlainRange(off, length)
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alignedOffset, alignedLength := blocks[0].JointCiphertextRange(blocks)
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skip := blocks[0].Skip
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tlog.Debug.Printf("JointCiphertextRange(%d, %d) -> %d, %d, %d", off, length, alignedOffset, alignedLength, skip)
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tlog.Debug.Printf("doRead: off=%d len=%d -> off=%d len=%d skip=%d\n",
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off, length, alignedOffset, alignedLength, skip)
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ciphertext := f.fs.contentEnc.CReqPool.Get()
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ciphertext = ciphertext[:int(alignedLength)]
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