Round 19 review follow-ups on the Studio code-exec sandbox classifier and runtime guard:
- Record a global/nonlocal sink alias in its TARGET scope (module for global, enclosing for
nonlocal): global s; s = os.system; s('...') now resolves s to the shell sink instead of
being skipped as a rebound name (and a global name no longer shadows an outer alias).
- Fail closed on any expansion in COMMAND POSITION, not just command substitution: a
variable-expanded command word (p=python3; $p -c ...) / ${VAR} is unprovable. Argument
position ($HOME, echo $(date)) stays allowed.
- Honor wrapper/command-position logic in the mutating-utility and shell-script scans via a
shared command-word index, so env sed -i / timeout 5 bash s.sh no longer hide behind a
wrapper prefix.
- Use the subprocess-exec callee resolver for the shell=True read scan, so
from subprocess import run as r; r('head /etc/passwd', shell=True) and r = subprocess.run
aliases are tokenized.
- Resolve sys.modules aliases (m = sys.modules; m.pop('_io')) for the loader-table mutation
checks (bound and unbound forms).
- Treat a __dict__ subscript keyed by a gadget dunder (type(open).__dict__['__closure__'].
__get__(open)) as gadget access, closing the descriptor-lookup route around the attribute
gadget scan.
- Unwrap inline literal containers in the higher-order sink check, so
list(map([eval][0], [...])) / map({'e': exec}['e'], ...) are flagged.
- Runtime: the mutator guard now accepts the path via its public keyword (os.makedirs(name=),
os.mkdir(path=)) instead of raising TypeError, while still confining the write.
Adds TestRound19Bypasses and keyword-path runtime tests; full sandbox suite green.
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