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fix: avoid panic when reading corrupt index in TSM file #24033

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fix: avoid panic when reading corrupt index in TSM file #24033

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fix: for critical issue #19916 (influxdb server crashed when reading …
gggevorgyan Jan 11, 2023
96fa817
fix: Improved error message to reflect count in it
Feb 19, 2024
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6 changes: 5 additions & 1 deletion tsdb/engine/tsm1/reader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1233,6 +1233,10 @@ func (d *indirectIndex) UnmarshalBinary(b []byte) error {
return fmt.Errorf("indirectIndex: not enough data for index entries count")
}
count := int32(binary.BigEndian.Uint16(b[i : i+indexCountSize]))

if count <= 0 {
return fmt.Errorf("invalid index %d; count must be greater than 0", count)
}
Comment on lines +1237 to +1239
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There is no way for count to be less than 0. All possible values of a uint16 will fit in an int32 and since uint16 is only positive, count will never be less than 0.

count could be 0, though, and we definitely don't want to continue further in this case. It's possible count == 0 is valid, but having logged is good for now.

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The fundamental solution for this case which I have considered was to add CRC for whole Index block as well, as it is done for other parts. But the solution obviously will break backward compatibility.
Are there any mechanism allowing to have support of different incompatible versions of *tsm file, with special hangling?
Another thing I have taken account during implementation is the following check in writer code tsdb/engine/tsm1/writer.go: 708 line , which skips count == 0 cases.

func (t *tsmWriter) WriteIndex() error {
	indexPos := t.n

	if t.index.KeyCount() == 0 {
		return ErrNoValues
	}

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It is unlikely we will introduce an incompatible TSM format at this point in the product's lifecycle.

i += indexCountSize

// Find the min time for the block
Expand Down Expand Up @@ -1350,7 +1354,7 @@ func (m *mmapAccessor) init() (*indirectIndex, error) {

indexOfsPos := len(m.b) - 8
indexStart := binary.BigEndian.Uint64(m.b[indexOfsPos : indexOfsPos+8])
if indexStart >= uint64(indexOfsPos) {
if indexStart >= uint64(indexOfsPos) || (uint64(indexOfsPos)-indexStart) > math.MaxInt32 {
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This added check ensures that index can be accessed using signed 32-bit offsets. Since int32 index offsets are used internally (see indirectIndex.UnmarshalBinary), I think this is a correct check. I would prefer a distinct error message for this case.

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It does look like the correct check. The error message (all the error messages in this method) should include the file name, which we have through m.f.Name()

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I think the most effective way to wrap the file name onto error massage is the line 240 in tsdb/engine/tsm1/reader.go.
What go you think @davidby-influx ?

index, err := t.accessor.init()
	if err != nil {
		**_return nil, err_**
	}

return nil, fmt.Errorf("mmapAccessor: invalid indexStart")
}

Expand Down