Sandbox an untrusted binary with bubblewrap (bwrap) using user namespaces, no root required
domain: github.com/containers/bubblewrap · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Install bubblewrap from your distribution's package repositories
Run a minimal sandbox exposing only selected parts of the filesystem, e.g.: bwrap --ro-bind /usr /usr --symlink usr/lib64 /lib64 --proc /proc --dev /dev --unshare-pid --new-session bash
Bind only what the binary needs, read-only (--ro-bind), letting the empty tmpfs root and nodev mounts provide isolation
Unshare namespaces for stronger isolation: --unshare-pid (own PID namespace), --unshare-net (own network namespace with only loopback), --unshare-ipc, --unshare-uts
Run the untrusted command inside; the sandbox is torn down automatically when the last process exits
Known gotchas
bubblewrap is a tool for constructing sandboxes, NOT a complete ready-made sandbox with a security policy - the security level is entirely determined by the arguments you pass
Mounted directories are nodev by default and can be made read-only
Always pass --new-session because of the TIOCSTI vulnerability (CVE-2017-5226) unless you filter TIOCSTI via seccomp
The setuid mode was removed; bubblewrap relies on unprivileged user namespaces
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