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Decide on tar-split usage based on trusted data in TOC 

Don't ignore the tar-split when the TOC requires one,
otherwise we could deduplicate a layer without tar-split
with a layer with tar-split.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>
This commit is contained in:
Miloslav Trmač 2024-06-12 16:10:58 +02:00
parent c193a4503f
commit f065a0a81c
1 changed files with 16 additions and 8 deletions
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24
pkg/chunked/compression_linux.go
View File

@ -209,18 +209,26 @@ func readZstdChunkedManifest(blobStream ImageSourceSeekable, tocDigest digest.Di
}
decodedTarSplit := []byte{}
if tarSplitChunk.Offset > 0 {
// we must consume the data to not block the producer
if toc.TarSplitDigest != "" {
if tarSplitChunk.Offset <= 0 {
return nil, nil, nil, 0, fmt.Errorf("TOC requires a tar-split, but the %s annotation does not describe a position", internal.TarSplitInfoKey)
}
tarSplit, err := readBlob(tarSplitChunk.Length)
if err != nil {
return nil, nil, nil, 0, err
}
// but ignore it when the digest is not present, because we can’t authenticate it against tocDigest
if toc.TarSplitDigest != "" {
decodedTarSplit, err = decodeAndValidateBlob(tarSplit, tarSplitLengthUncompressed, toc.TarSplitDigest.String())
if err != nil {
return nil, nil, nil, 0, fmt.Errorf("validating and decompressing tar-split: %w", err)
}
decodedTarSplit, err = decodeAndValidateBlob(tarSplit, tarSplitLengthUncompressed, toc.TarSplitDigest.String())
if err != nil {
return nil, nil, nil, 0, fmt.Errorf("validating and decompressing tar-split: %w", err)
}
} else if tarSplitChunk.Offset > 0 {
// We must ignore the tar-split when the digest is not present in the TOC, because we can’t authenticate it.
//
// But if we asked for the chunk, now we must consume the data to not block the producer.
// Ideally the GetBlobAt API should be changed so that this is not necessary.
_, err := readBlob(tarSplitChunk.Length)
if err != nil {
return nil, nil, nil, 0, err
}
}
return decodedBlob, toc, decodedTarSplit, int64(manifestChunk.Offset), err