Understand gVisor's Linux syscall and API compatibility limits before sandboxing untrusted code
domain: gvisor.dev · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Read the official Applications (compatibility) page to know what works vs what does not
Expect most language runtimes (Python, Java, Node.js, PHP, Go) to work - they auto-probe which syscall variant to use for I/O
Plan around the known gaps: io_uring is disabled by default, iptables is only partially supported, and block-device filesystems (fat32/ext3/ext4) cannot be mounted from inside the sandbox
Note resource limits: in-sandbox cgroups do accounting but do NOT enforce limits between processes in the same sandbox
If a container misbehaves, gather debug logs and file a bug with the exact command used
Known gotchas
io_uring is disabled by default; when enabled only basic I/O operations are supported
KVM from within the sandbox is not supported; custom hardware device files are generally unsupported except NVIDIA GPUs and TPU devices
Unimplemented syscalls are mostly alternatives to ones gVisor does support, so the supported-syscall list is not a good measure of real-world compatibility
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