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Open_Ultra_SAST/benchmarks
Marius CiepluchandClaude Opus 5 61811512a8 feat(facts): PHP semantic facts, validated against a real PHP CPG
contributor-scan 5.1, the first step toward the v0.1 WordPress target.

Written against a PHP CPG rather than against PHP source, because the two
do not look alike. Verified with joern-parse 4.0.623 / php2cpg on a probe:

  $_GET["name"]               ->  call `<operator>.indexAccess`, CODE $_GET["name"]
  mysqli_query($conn, $sql)   ->  call NAMED mysqli_query
  echo $_GET["msg"]           ->  call NAMED echo

So sources match on code and sinks match on name, and every entry the
probe did not exercise is marked unverified in the file -- `include` and
`require` among them, which is PHP's most characteristic path bug and the
first thing to check on a real checkout.

Five families derive (injection, output_encoding, path, deserialization,
untrusted_destination) with no sink that is its own sanitizer -- asserted
by a test, because that bug class has now appeared three times in three
matchers. `php` is added to the region model's languages, without which
the facts would have reached nothing.

The arbiter decides 4 of 4 on the probe: the SQL concat entails, its
`mysqli_real_escape_string` twin drops to corroborated, `echo` XSS entails
and `system` command injection entails.

**A whole scan finds 2 of those 3, and the gap is the finding.** PHP files
yield FILE-LEVEL regions because no PHP entry points are mapped, and the
taint arbiter returns one verdict per region per family -- so a file-level
region reports at most one injection finding however many it holds.
`system` won on flow length and the SQL injection went unreported. That is
the mirror image of task 2.9: that one is many regions collapsing to one
site, this is many sites collapsing to one verdict, and it bites hardest
exactly where PHP needs it not to, since a WordPress file is large and has
no decorator for the mapper to find.

Recorded as task 5.4 with WordPress's registration model (add_action,
add_filter, admin-ajax, REST routes), which the mapper already handles in
principle for other frameworks.

A 13-line probe is not a WordPress result. What is established is that the
seam works end to end for PHP; everything about scale and coverage is
unmeasured, and there are still zero PHP pairs in a corpus of 263 python,
351 c_cpp, 47 javascript and 49 java.

Gates byte-identical.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG
2026-09-09 14:18:57 +02:00
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