* feat(nsjail): optional disk-backed /tmp via instance setting
* test(nsjail): unit-test tmp mount resolver and narrow visibility
* refactor(nsjail): switch tmp backing to select + conditional UI
* ui(nsjail): make tmpfs the visible default in /tmp backing select
* fix(nsjail): refuse preexisting jail_tmp to block symlink escape
* fix(nsjail): allow jail_tmp reuse on sequential nsjail calls
Codex flagged that python/ruby/rust executors invoke nsjail twice per
job_dir (install then run). The previous resolver treated any preexisting
jail_tmp as hostile and silently fell back to tmpfs on the second call,
so disk-backed mode never reached the main script run for those langs.
Use symlink_metadata().is_dir() to distinguish a real directory left by
an earlier call in the same job_dir (safe to reuse) from a symlink or
other entity (still refused, as the codebase-tar escape requires).
Also loosen the frontend visibility predicate: only hide nsjail settings
when job_isolation is explicitly 'none' or 'unshare', so deployments
that enable nsjail via DISABLE_NSJAIL=false with no DB setting can
still see the controls.
* feat(nsjail): make tmpfs size configurable via instance setting
Adds a new `nsjail_tmpfs_size_mb` instance setting that overrides the
size of the `/tmp` tmpfs mount inside the nsjail sandbox across all
languages. When unset, the existing per-language defaults (500MB or
800MB) continue to apply, so no behavior change for existing
deployments.
The setting is exposed under Settings → Jobs and is read at job
execution time, so changes take effect on the next job without a
restart.
Fixes WIN-1963
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* refactor(nsjail): unify default tmpfs size to 800MB
Previously each executor passed its own per-language default (500MB or
800MB) to resolve_nsjail_tmpfs_size. Unify on a single
DEFAULT_NSJAIL_TMPFS_SIZE_BYTES constant (800MB) so the placeholder
behavior is consistent across languages.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* fix(nsjail): resolve tmpfs size outside ruby download closure
The download.ruby config render runs inside a sync closure passed to
par_install_language_dependencies_seq, so `.await` on
resolve_nsjail_tmpfs_size() was a compile error under the `ruby`
feature. Resolve the size once before the closure and capture the
string instead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* docs(nsjail): rename resolver to *_bytes and clarify fallback
Addresses CI review feedback:
- Rename `resolve_nsjail_tmpfs_size` to `resolve_nsjail_tmpfs_size_bytes`
so the returned unit is unambiguous at the call site (cubic P2).
- Fix the `NSJAIL_TMPFS_SIZE_MB` doc comment that still said "per-language
default" — there is no per-language fallback anymore, all unset
values resolve to the unified 800MB `DEFAULT_NSJAIL_TMPFS_SIZE_BYTES`
(codex/pi P2).
- Expand the resolver doc to call out that `Some(0)` and negative values
also fall back, since the match arm is `Some(mb) if mb > 0`.
No behavior change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* fix: bind /etc resolver files read-only in nsjail sandboxes
* docs(nsjail): explain why per-file /etc resolver binds are load-bearing
The explicit /etc/hosts, /etc/resolv.conf and /etc/hostname binds look
like removable duplication of the read-only /etc bind above them. They
are not: on Kubernetes those files are separate kubelet bind-mounts on
top of /etc and nsjail's read-only remount is non-recursive, so without
these shadow binds they stay writable and a job can persist cross-tenant
DNS poisoning for the pod lifetime. Comment guards against a future
"dedup cleanup" silently reintroducing the vulnerability.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* docs(nsjail): shorten the load-bearing-bind comment to 3 lines
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude <noreply@anthropic.com>
Ruben Fiszel
Pyra