The five Python taint fixtures under tests/fixtures/ast-scan/ move into
tests/helpers/payload-trees.mjs as the `ast-scan` tree, written to a temp
dir by the test like the three S1 trees. av-surface probe (d) gains the
directory: 5 -> 6 trees.
PM decision (S3 order): creds-net.py is os.environ -> requests.post, the
exfiltration shape AV classifiers are trained on; one rule, "no
payload-shaped runnable file on disk", is easier to defend than an
exception. The .py files match no SIG rule and are stored as plain lines.
Deviation from the order: it named three files (sinks, creds-net, scope);
the directory holds five (also reassign.py, sentinel.py). Gating the
directory means all five move.
Measured: (d) red first, d=1 (5 files) of 6 trees, then 0. sha256 of all
five on-disk files taken before git rm; payload-trees.test.mjs asserts
them, mutation-checked (one byte in creds-net.py -> red, restored
byte-identical). ast-taint-scanner.test.mjs 12/12 with the materialized
tree, both before and after the files were removed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
v8.1.0 AV surface, session S1. The three poisoned fixture trees
(signature-scan/poisoned, memory-scan/poisoned-project, trigger-scan/poisoned)
are deleted from disk and materialized into a temp dir by the new
tests/helpers/payload-trees.mjs. SIG-matching strings are assembled from
fragments, the zero-width carrier comes from String.fromCodePoint, and every
file carries the sha256 of the retired on-disk bytes;
tests/helpers/payload-trees.test.mjs asserts the materialized trees are
byte-identical (mutation-checked: one changed byte fails it).
Inline payload literals in signature-scanner, signature-scanner-custom-rules
and e2e/scan-pipeline are fragmented the same way; the literal U+200B in
attack-simulator, auto-cleaner-rce and auto-cleaner-traversal is replaced by
String.fromCodePoint(0x200B).
av-surface: a 3->0, a2 3->0, c 5->1, d 5->2, b 9->8 (webshell-b64 blob gone).
What remains (c=1, d=2, b) is under examples/** or is (b), both S2.
Suite 2261 / 2252 pass / 3 fail (av-surface b, c, d only) / 6 skip.
Golden output identical before/after (109/7/4, 61/61).
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
