04a6fa1b41
`readerAtAdapter.ReadAt` seeks and then issues a single `Read`, which breaks the `io.ReaderAt` contract in both directions against the squashfs reader it exists to wrap: - `squashfs.File.Read` copies against the decompressed block length but advances its block cursor by the nominal block size, so a block that decompresses short silently stops copying and returns fewer bytes with a nil error. `ReadAt` forbids that, and callers rely on it: anything decoding a fixed-size structure off the result gets zero padding it has no way to detect and parses it as real data. The GraalVM PE export table and the UPX block reader both size a buffer from a header field and then ignore `n` entirely, so a crafted image drives them straight through the padding. - a read landing exactly on the end of the file returns a *full* buffer paired with `io.EOF`. `bytes.Reader.ReadAt` returns nil there, and the callers that treat any error as fatal were written against that, so squashfs-resident binaries sized near a read boundary were being skipped outright. `io.ReadFull` normalizes both: it fills the buffer across short reads, and it clears the error once the buffer is full. A genuinely short tail is reported as `io.EOF`, which is what `ReadAt` implementations return at the end of a file, and what the buffering branch of `GetUnionReader` already returns. Affects squashfs-backed sources (snaps), so in practice the binary catalogers reading structure out of executables. Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Syft
A CLI tool and Go library for generating a Software Bill of Materials (SBOM) from container images and filesystems. Exceptional for vulnerability detection when used with a scanner like Grype.
Features
- Generates SBOMs for container images, filesystems, archives (see the docs for a full list of supported scan targets)
- Supports dozens of packaging ecosystems (e.g. Alpine (apk), Debian (dpkg), RPM, Go, Python, Java, JavaScript, Ruby, Rust, PHP, .NET, and many more)
- Supports OCI, Docker, Singularity, and more image formats
- Works seamlessly with Grype for vulnerability scanning
- Multiple output formats (CycloneDX, SPDX, Syft JSON, and more) including the ability to convert between SBOM formats
- Create signed SBOM attestations using the in-toto specification
Tip
New to Syft? Check out the Getting Started guide for a walkthrough!
Installation
The quickest way to get up and going:
curl -sSfL https://get.anchore.io/syft | sudo sh -s -- -b /usr/local/bin
Tip
See Installation docs for more ways to get Syft, including Homebrew, Docker, Scoop, Chocolatey, Nix, and more!
The basics
See the packages within a container image or directory:
# container image
syft alpine:latest
# directory
syft ./my-project
To get an SBOM, specify one or more output formats:
# SBOM to stdout
syft <image> -o cyclonedx-json
# Multiple SBOMs to files
syft <image> -o spdx-json=./spdx.json -o cyclonedx-json=./cdx.json
Tip
Check out the Getting Started guide to explore all of the capabilities and features.
Want to know all of the ins-and-outs of Syft? Check out the CLI docs, configuration docs, and JSON schema.
Contributing
We encourage users to help make these tools better by submitting issues when you find a bug or want a new feature. Check out our contributing overview and developer-specific documentation if you are interested in providing code contributions.
Syft development is sponsored by Anchore, and is released under the Apache-2.0 License.
The Syft logo by Anchore is licensed under CC BY 4.0
For commercial support options with Syft or Grype, please contact Anchore.
Come talk to us!
The Syft Team holds regular community meetings online. All are welcome to join to bring topics for discussion.
- Check the calendar for the next meeting date.
- Add items to the agenda (join this group for write access to the agenda)
- See you there!