fix(security): add prompt injection detection to personalization writes - #207
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Memories and rules were only screened by check_safety (harm classifier) before being injected verbatim into the system prompt. An attacker could store a jailbreak payload that passes the harm check, then have it executed as a system instruction on the next request. - Add check_injection() calls in create_memory() and upsert_rule() alongside the existing check_safety() calls - Wrap injected user content in delimiter tags (<user-provided-memories>, <user-provided-rules>) with explicit instruction hierarchy markers telling the LLM not to interpret the content as commands - Add unit tests for delimiter fencing Closes redhat-data-and-ai#205 Signed-off-by: Soham Dutta <19648293+NP-compete@users.noreply.github.com>
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WalkthroughPersonalization content is sanitized and fenced as user-provided data. Possibly related PRs
Suggested labels: Suggested reviewers: Merge Risk: 🔵 Low · up to The PR adds prompt-injection checks and delimiter fencing for personalization writes. It is mergeable with owner awareness because the regression test does not verify the rule closing delimiter, so a future fencing regression could go undetected. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@deep_agent/src/personalization/injector.py`:
- Around line 39-52: Encode or serialize each untrusted memory and rule value
before interpolating it into the delimiter blocks built by the personalization
injector, preserving the intended user-data boundaries. Update tests in
tests/unit/test_personalization.py lines 70-87 to cover closing-tag payloads for
both memories and rules and assert that injected payloads cannot produce an
additional literal closing tag.
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User content containing </user-provided-memories> or </user-provided-rules> could break out of the delimiter boundary and place attacker text outside the user-data fence. Sanitize closing tags by HTML-encoding angle brackets before interpolation. Add tests for closing-tag breakout attempts in both memories and rules. Signed-off-by: Soham Dutta <19648293+NP-compete@users.noreply.github.com>
Add tests for the injection check code paths in create_memory() and upsert_rule(). Covers both the pass-through case (safety + injection both pass) and the rejection case (safety passes, injection fails). Also mock check_injection in the existing guardian-passes test. Signed-off-by: Soham Dutta <19648293+NP-compete@users.noreply.github.com>
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Inline comments:
In `@tests/unit/test_personalization.py`:
- Around line 100-104: Update test_cross_tag_breakout_in_memory_is_escaped to
also assert that result contains the escaped user-provided-rules closing
delimiter "&lt;/user-provided-rules&gt;", ensuring both injected closing
tags are escaped.
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In `@tests/unit/test_repository.py`:
- Around line 341-372: Strengthen tests/unit/test_repository.py lines 341-372 by
binding the AsyncConnection.connect patch and asserting neither it nor
mock_conn.commit was awaited after create_memory rejects injection. Apply the
same assertions in tests/unit/test_repository.py lines 400-430 for the rule
rejection path, ensuring both rejection flows avoid opening or committing a
database connection.
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- Assert cross-tag </user-provided-rules> is also escaped in memory breakout test - Assert no DB connection or commit when injection check rejects in both create_memory and upsert_rule rejection tests Signed-off-by: Soham Dutta <19648293+NP-compete@users.noreply.github.com>
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Inline comments:
In `@tests/unit/test_personalization.py`:
- Line 105: Strengthen the assertion in the personalization test by also
verifying that result contains zero occurrences of the raw closing
user-provided-rules delimiter, while retaining the existing escaped-string
assertion.
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Add assertion that </user-provided-rules> has zero raw occurrences in the cross-tag breakout test, since the payload is inside a memory block and the raw tag should never appear. Signed-off-by: Soham Dutta <19648293+NP-compete@users.noreply.github.com>
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Summary
Closes #205
check_injection()calls increate_memory()andupsert_rule()alongside existingcheck_safety()calls so Granite Guardian screens personalization content for prompt injection and jailbreak attempts before storage<user-provided-memories>/<user-provided-rules>delimiter tags with explicit instruction hierarchy markers telling the LLM not to interpret the content as commands or policy overridesTest plan
test_personalization.pytests pass (injector output format)test_memories_wrapped_in_delimiter_tags,test_rules_wrapped_in_delimiter_tags,test_injection_attempt_is_fenced)check_injectionGUARDIAN_API_BASEunset), confirm memories/rules still save normally (guardian checks are gated on the setting)