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Ruben Fiszel b656dc6cdc feat(nsjail): optional disk-backed /tmp via instance setting (#9272)
* 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.
2026-05-21 15:34:49 +00:00

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name: "java run script"
mode: ONCE
hostname: "java"
log_level: ERROR
time_limit: {TIMEOUT}
disable_rl: true
cwd: "/tmp"
clone_newnet: false
clone_newuser: {CLONE_NEWUSER}
skip_setsid: true
keep_caps: false
keep_env: true
mount_proc: true
mount {
src: "/bin"
dst: "/bin"
is_bind: true
}
mount {
src: "/lib"
dst: "/lib"
is_bind: true
}
mount {
src: "/lib64"
dst: "/lib64"
is_bind: true
mandatory: false
}
mount {
src: "/usr"
dst: "/usr"
is_bind: true
}
mount {
src: "/dev/null"
dst: "/dev/null"
is_bind: true
rw: true
}
{TMP_MOUNT_BLOCK}
mount {
src: "{JOB_DIR}/target"
dst: "/tmp/target"
is_bind: true
mandatory: false
}
mount {
src: "{JOB_DIR}/args.json"
dst: "/tmp/args.json"
is_bind: true
}
mount {
src: "{JOB_DIR}/result.json"
dst: "/tmp/result.json"
rw: true
is_bind: true
}
mount {
src: "{CACHE_DIR}"
dst: "{CACHE_DIR}"
is_bind: true
mandatory: false
}
mount {
src: "/etc"
dst: "/etc"
is_bind: true
}
# Container runtimes bind exactly these 3 files as separate submounts over
# /etc; nsjail's ro remount of /etc is non-recursive so they stay writable.
# Load-bearing -- do not remove as redundant with the /etc bind above.
mount {
src: "/etc/resolv.conf"
dst: "/etc/resolv.conf"
is_bind: true
mandatory: false
}
mount {
src: "/etc/hosts"
dst: "/etc/hosts"
is_bind: true
mandatory: false
}
mount {
src: "/etc/hostname"
dst: "/etc/hostname"
is_bind: true
mandatory: false
}
mount {
src: "/dev/random"
dst: "/dev/random"
is_bind: true
}
mount {
src: "/dev/urandom"
dst: "/dev/urandom"
is_bind: true
}
iface_no_lo: true
{SHARED_MOUNT}