Files
gstack/investigate/sections/polluter.md.tmpl
Garry Tanandcapy-ai[bot] 4c6fa89cdc v1.91.159.0 security: gstack's Bun entry points ignore the audited repo's .env and bunfig.toml (S1) (#3312)
* security: isolate every gstack Bun entry point from the audited checkout's .env and bunfig.toml

Bun auto-loads .env, .env.local and .env.<NODE_ENV> from its cwd and runs a
cwd bunfig.toml preload before the program starts. gstack runs inside the repo
it audits, so a committed .env could steer state roots, the claude binary or
spend caps, and a bunfig preload ran arbitrary code in every bin and hook.

Every bun shebang, shell and skill caller, TypeScript spawn and compiled build
now disables both (--no-env-file --config=/dev/null, bunIsolationArgs(),
--no-compile-autoload-dotenv/bunfig), with a ratchet and hostile-fixture
regressions.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test: name the directly executed scripts in the isolation ratchet

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test: follow the isolation flags in touchfiles, copy lists, recipe assertions and the harness pin

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix: keep browse/src/bun-child-config.ts unchanged so the native cookie qualification still binds

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(windows): the empty bunfig outlives its process so the timeline hook's detached repair child can read it

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* v1.91.159.0 security: gstack's Bun entry points ignore the audited repo's .env and bunfig.toml (S1)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* test: plan-mode render pattern accepts the isolation flags

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
2026-10-20 00:24:28 +00:00

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## Polluter recipe
A polluter is an earlier test that leaks state the victim depends on: the victim
passes alone and fails in the suite or in one shard.
1. **File order from the CI log.** The shard runner prints its file list in
execution order. Take the files that ran before the victim in the failing
shard (`gh run view <run-id> --log`, or the local shard listing
`bun --no-env-file --config=/dev/null run scripts/ship-measure.ts free --shard <I>` which reproduces the exact
packing `bun run test` used).
2. **Confirm the dependency.** The victim alone passes; the victim after the
earlier files fails (`<affected-files>` is the earlier files then the victim,
comma-joined, in shard order):
```bash
bun --no-env-file --config=/dev/null run scripts/ship-measure.ts free --files <failing-test-file> --reruns 3
bun --no-env-file --config=/dev/null run scripts/ship-measure.ts free --files <affected-files> --reruns 3
```
3. **Bisect the earlier files.** Halve the earlier list, keep the half that
still fails the victim, repeat until one file remains. Each step is one
`--files` run; log the list at every step.
4. **Name what leaked.** Read the polluter for state that outlives it: an env
var, `process.cwd()`, `process.exitCode`, a module-level cache or singleton,
a mock or spy left installed, a server or watcher left listening, a temp
file under a shared path, a learnings or state file under the home
directory (the free lane's home guard reports these), a global timer.
5. **Fix the polluter, not the victim.** Restore or isolate the state where it
is created (`afterEach`, `mkdtemp`, a private env); an order-dependent
`beforeEach` added to the victim hides the leak for the next victim.
6. **Report:** `POLLUTER: <file> leaked <what> into <victim>; fixed by <change>`,
with the bisect log. If the polluter is on main, the victim's failure is
outside the PR (route it with the flake recipe's evidence section).