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fix(security): use relpath containment instead of startswith to prevent prefix-collision bypass #11242

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HAL9000 wants to merge 4 commits from feature/security-fix-relpath-pr-11217 into master
pull from: feature/security-fix-relpath-pr-11217
merge into: cleveragents:master
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HAL9000 commented 2026-05-17 20:14:45 +00:00
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Summary

Replaces insecure str().startswith() path containment checks with proper, canonicalized path containment using os.path.relpath(), Path.is_relative_to(), and Path.relative_to() across three files. This prevents prefix-collision attacks where a malicious path like /tmp/evil could bypass an intended check for paths starting with /tmp/e.

## Summary Replaces insecure `str().startswith()` path containment checks with proper, canonicalized path containment using `os.path.relpath()`, `Path.is_relative_to()`, and `Path.relative_to()` across three files. This prevents prefix-collision attacks where a malicious path like `/tmp/evil` could bypass an intended check for paths starting with `/tmp/e`.
fix(security): use relpath containment instead of startswith to prevent prefix-collision bypass
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52c7e96d6b 
Replace str().startswith(root) checks with proper relpath-based
containment that prevents prefix-collision bypass attacks where a
sibling directory whose name starts with the root path would pass
an unchecked containment test.

Files changed:
- decomposition_clustering.py: Use os.path.relpath() instead of
  string-prefix matching for root-relative path computation.
- plan.py (_apply_sandbox_changes): Use Path.is_relative_to()
  instead of str.startswith() for sandbox-to-project root check.
- inline_executor.py: Use Path.relative_to() instead of
  str.startswith() for sandbox containment validation.
chore: re-trigger CI [controller]
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4a71e3c368
HAL9000 force-pushed feature/security-fix-relpath-pr-11217 from 4a71e3c368
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to 9d0c5850b3
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2026-05-28 04:09:45 +00:00 Compare 
Two follow-up bugs from the relpath-containment refactor:

1. decomposition_clustering._directory_key had inverted boolean logic:
   `if not (rel == "" or not rel.startswith(".." + os.sep))` meant the
   relative path was used ONLY when it escaped the root, and discarded
   when the path was actually inside the root. Fixed to update
   `normalized` exactly when the path is inside (or equal to) root.

2. inline_executor._validate_paths split the original
   `except (OSError, ValueError)` so that ValueError from
   `Path(value).resolve()` (raised for invalid paths such as those
   containing null bytes) propagated instead of returning a graceful
   "Invalid path" error string.

ISSUES CLOSED: #11217
chore: worker ruff auto-fix (pre-push lint gate)
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0aff794f69
HAL9000 commented 2026-05-28 13:46:14 +00:00
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[CONTROLLER-DEFER:Gate 1:needs_evaluation]

This PR has been deferred for re-evaluation. The controller has stepped back
from processing it. To resume, a human or scope-evaluator must clear the
deferral flag AND re-add the auto/sentinel label.

Decision:

  • Gate: Gate 1
  • Reason category: needs_evaluation
  • Canonical: #-
  • LLM confidence: medium
  • LLM reasoning: PR #11242 (anchor) and PR #11217 have identical titles and both fix the same security issue (#7478) using the relpath containment approach. The anchor's head branch name explicitly references "#11217", indicating it builds on that work. However, #11242 has 4.5x larger scope (32 additions vs 7, covering 3 files vs 1). This could represent: (1) necessary comprehensive coverage of the vulnerability across the codebase, or (2) redundant extension beyond what #11217 sufficiently addresses. Human judgment required to determine if #11242's broader file coverage is essential or unnecessary.
  • Preserved value (when applicable): PR #11242 applies the security fix to 3 files across the codebase (32 additions, 16 deletions), while PR #11217 covers only 1 file (7 additions, 1 deletion). The broader scope in the anchor may be necessary for comprehensive security coverage against prefix-collision bypass attacks across all vulnerable code paths, or may represent over-engineering if the issue is adequately addressed by PR #11217's focused approach.

To clear the deferral (SQL):
UPDATE workflows SET deferred_reason=NULL,
deferred_at=NULL,
deferred_target_workflow_id=NULL
WHERE workflow_id = 8;

INSERT INTO controller_events
  (workflow_id, ts, event_type, payload, cause, forgejo_write_pending, replay_attempts)
VALUES (8, datetime('now'), 'deferral_cleared',
        json_object('cleared_by', 'operator', 'reason', '<your reason>'),
        'operator', 0, 0);

Audit ID: 1354

Automated by the CleverAgents controller pipeline.
Identity: HAL9000 (pipeline action)

[CONTROLLER-DEFER:Gate 1:needs_evaluation] This PR has been deferred for re-evaluation. The controller has stepped back from processing it. To resume, a human or scope-evaluator must clear the deferral flag AND re-add the auto/sentinel label. Decision: - Gate: Gate 1 - Reason category: needs_evaluation - Canonical: #- - LLM confidence: medium - LLM reasoning: PR #11242 (anchor) and PR #11217 have identical titles and both fix the same security issue (#7478) using the relpath containment approach. The anchor's head branch name explicitly references "#11217", indicating it builds on that work. However, #11242 has 4.5x larger scope (32 additions vs 7, covering 3 files vs 1). This could represent: (1) necessary comprehensive coverage of the vulnerability across the codebase, or (2) redundant extension beyond what #11217 sufficiently addresses. Human judgment required to determine if #11242's broader file coverage is essential or unnecessary. - Preserved value (when applicable): PR #11242 applies the security fix to 3 files across the codebase (32 additions, 16 deletions), while PR #11217 covers only 1 file (7 additions, 1 deletion). The broader scope in the anchor may be necessary for comprehensive security coverage against prefix-collision bypass attacks across all vulnerable code paths, or may represent over-engineering if the issue is adequately addressed by PR #11217's focused approach. To clear the deferral (SQL): UPDATE workflows SET deferred_reason=NULL, deferred_at=NULL, deferred_target_workflow_id=NULL WHERE workflow_id = 8; INSERT INTO controller_events (workflow_id, ts, event_type, payload, cause, forgejo_write_pending, replay_attempts) VALUES (8, datetime('now'), 'deferral_cleared', json_object('cleared_by', 'operator', 'reason', '<your reason>'), 'operator', 0, 0); Audit ID: 1354 --- Automated by the CleverAgents controller pipeline. Identity: HAL9000 (pipeline action) <!-- controller:fingerprint:9ad2f404a97cfcfc -->
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git fetch -u origin feature/security-fix-relpath-pr-11217:feature/security-fix-relpath-pr-11217
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