diff options
Diffstat (limited to 'vendor/github.com')
| -rw-r--r-- | vendor/github.com/vbatts/tar-split/README.md | 3 | ||||
| -rw-r--r-- | vendor/github.com/vbatts/tar-split/tar/asm/disassemble.go | 43 |
2 files changed, 30 insertions, 16 deletions
diff --git a/vendor/github.com/vbatts/tar-split/README.md b/vendor/github.com/vbatts/tar-split/README.md index 4c544d823..03e3ec430 100644 --- a/vendor/github.com/vbatts/tar-split/README.md +++ b/vendor/github.com/vbatts/tar-split/README.md @@ -1,6 +1,7 @@ # tar-split [](https://travis-ci.org/vbatts/tar-split) +[](https://goreportcard.com/report/github.com/vbatts/tar-split) Pristinely disassembling a tar archive, and stashing needed raw bytes and offsets to reassemble a validating original archive. @@ -50,7 +51,7 @@ For example stored sparse files that have "holes" in them, will be read as a contiguous file, though the archive contents may be recorded in sparse format. Therefore when adding the file payload to a reassembled tar, to achieve identical output, the file payload would need be precisely re-sparsified. This -is not something I seek to fix imediately, but would rather have an alert that +is not something I seek to fix immediately, but would rather have an alert that precise reassembly is not possible. (see more http://www.gnu.org/software/tar/manual/html_node/Sparse-Formats.html) diff --git a/vendor/github.com/vbatts/tar-split/tar/asm/disassemble.go b/vendor/github.com/vbatts/tar-split/tar/asm/disassemble.go index 54ef23aed..009b3f5d8 100644 --- a/vendor/github.com/vbatts/tar-split/tar/asm/disassemble.go +++ b/vendor/github.com/vbatts/tar-split/tar/asm/disassemble.go @@ -2,7 +2,6 @@ package asm import ( "io" - "io/ioutil" "github.com/vbatts/tar-split/archive/tar" "github.com/vbatts/tar-split/tar/storage" @@ -119,20 +118,34 @@ func NewInputTarStream(r io.Reader, p storage.Packer, fp storage.FilePutter) (io } } - // it is allowable, and not uncommon that there is further padding on the - // end of an archive, apart from the expected 1024 null bytes. - remainder, err := ioutil.ReadAll(outputRdr) - if err != nil && err != io.EOF { - pW.CloseWithError(err) - return - } - _, err = p.AddEntry(storage.Entry{ - Type: storage.SegmentType, - Payload: remainder, - }) - if err != nil { - pW.CloseWithError(err) - return + // It is allowable, and not uncommon that there is further padding on + // the end of an archive, apart from the expected 1024 null bytes. We + // do this in chunks rather than in one go to avoid cases where a + // maliciously crafted tar file tries to trick us into reading many GBs + // into memory. + const paddingChunkSize = 1024 * 1024 + var paddingChunk [paddingChunkSize]byte + for { + var isEOF bool + n, err := outputRdr.Read(paddingChunk[:]) + if err != nil { + if err != io.EOF { + pW.CloseWithError(err) + return + } + isEOF = true + } + _, err = p.AddEntry(storage.Entry{ + Type: storage.SegmentType, + Payload: paddingChunk[:n], + }) + if err != nil { + pW.CloseWithError(err) + return + } + if isEOF { + break + } } pW.Close() }() |