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[PR #3575] [MERGED] fix(contracts): reject NUL bytes in Frida, Rizin, and GDB local path inputs #5834
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opened 2026-10-31 01:09:47 +00:00 by bsakaguchi
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📋 Pull Request Information
Original PR: https://github.com/morluto/rea/pull/3575
Author: @DeryFerd
Created: 10/14/2026
Status: ✅ Merged
Merged: 10/14/2026
Merged by: @morluto
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main← Head:fix/local-path-schema-frida-rizin-gdb📝 Commits (1)
08193b0fix(contracts): reject NUL bytes in Frida, Rizin, and GDB local path inputs📊 Changes
4 files changed (+42 additions, -9 deletions)
View changed files
📝
src/contracts/fridaToolContracts.ts(+5 -4)📝
src/contracts/gdbToolContracts.ts(+2 -3)📝
src/contracts/rizinDebugToolContracts.ts(+3 -2)📝
tests/acceptance/tools/localToolContracts.test.ts(+32 -0)📄 Description
Summary
Fixes a contract gap where several caller-selected local path inputs on the Frida, Rizin, and GDB tools were typed as plain strings instead of the shared local-path schema, so an embedded NUL byte passed advertised and runtime validation and only failed later inside a provider or a filesystem call.
Every other local-input tool in REA already refuses NUL at the contract boundary through
localPathStringSchemainsrc/domain/localPath.ts. These seven fields were added after the earlier NUL sweeps (#1873, #1899, #1925) and were not included, so they drifted from the rest of the surface. This change routes them through the same shared schema and extends the existing OS-invalid-local-input acceptance harness to the tools that were missing from it.Problem and expected behavior
The smallest trigger is calling
start_frida_sessionwith{"mode":"spawn","device_id":"local","program":"/tmp/selected\u0000filename"}. The advertised JSON Schema only requiredminLength: 1, so the value was accepted, and the NUL was carried into the Frida spawn path where it surfaced as an opaquecapability_unavailableerror rather than a named input constraint. The expected behavior is a typed schema rejection that names the NUL byte, consistent with every other local path tool.The violated invariant is that caller-selected local filesystem paths are validated once at the owning contract boundary. A NUL byte is never a valid path component on any supported platform, so admitting it defers a deterministic, caller-visible mistake to a deeper layer, where it reads as a provider failure instead of a request error. The same gap applied to
load_frida_script.path, bothinstrument_with_fridapath and program fields,start_rizin_debug_session.path,start_rizin_debug_session.inferior_tty, andstart_gdb_session.inferior_tty.Change and scope
start_frida_session.program,load_frida_script.path,instrument_with_frida.program, andinstrument_with_frida.pathinsrc/contracts/fridaToolContracts.tsthroughlocalPathStringSchema.start_rizin_debug_session.pathandstart_rizin_debug_session.inferior_ttyinsrc/contracts/rizinDebugToolContracts.tsthrough the same schema.start_gdb_session.inferior_ttyinsrc/contracts/gdbToolContracts.tsthrough the same schema, keeping its existing description.tests/acceptance/tools/localToolContracts.test.tswith one case per field so the shared harness covers the Frida, Rizin, and GDB tools.The approach reuses the existing schema owner rather than adding a new validation layer, which is how the earlier fixes in this class landed. The
.regex(/^[^\x00]*$/u)pattern onnulFreeStringSchemasurvivesz.toJSONSchema, so the constraint is advertised to clients and enforced at runtime from the same definition. GDB already rejected a NULinferior_ttyat runtime inGdbSessionManager, so its change is contract consistency rather than a behavior change; Frida and Rizin had no service-level NUL check for these fields.Intentionally not included: no changes to the path values themselves, no new absolute-path requirement (that would be a separate, breaking contract change), and no changes to any tool outside the Frida, Rizin, and GDB contracts.
Contract and boundary impact
src/contracts/own input admission; the change moves the earliest NUL rejection to the advertised contract boundary.minLength: 1. The generated MCP tool catalog is regenerated by CI and validated; no committed catalog file changes.docs/public/product-catalog.json), package, or installation impact (CI generates and validates ignored catalogs andskills/; edit authored instructions in.agents/skills/reverse-engineer-anything/and never commit build outputs): none.Expected effects (check known effects; use documentation-only on its own). Unchecked items do not establish absence; leave uncertainties visible.
Evidence and regression coverage
tests/acceptance/tools/localToolContracts.test.ts, which drives the real advertised MCP contracts through the built server and asserts each request is rejected with a message containingNUL.start_frida_session, showing the NUL input passed schema validation and reached the provider, where it surfaced ascapability_unavailablewith the messageUnable to find executable at '/tmp/selected'(the value truncated at the NUL). After the change the harness passes and the response is a schema error naming the NUL byte.For evidence-bearing changes:
Validation performed
npm run test:focused -- tests/acceptance/tools/localToolContracts.test.ts— 1 passed (the OS-invalid-local-input matrix now includes the Frida, Rizin, and GDB cases); fails on the base revision for the intended reason.npm run test:focused -- src/contracts/fridaToolContracts.test.ts src/contracts/sessionPathInputs.test.ts src/contracts/advertisedInputExamples.test.ts tests/boundary/mcp/fridaLifecycleMcp.test.ts tests/boundary/mcp/rizinDebuggerCancellationMcp.test.ts tests/boundary/mcp/gdbCancellationMcp.test.ts— 49 passed, 5 skipped.npm run test:focused -- src/contracts/compactInputSchema.test.ts src/contracts/toolInputReferences.test.ts src/contracts/toolOutputReferences.test.ts src/contracts/workflowInputContracts.test.ts— 43 passed.npm run typecheck— clean.npx oxlinton the four changed files — 0 warnings, 0 errors.npx oxfmt --checkon the four changed files — clean.npm run verify:module-boundaries— checked 1886 source files, clean.npm run mcp-catalog:check— passed.npm run docs:check— 5 passed.Compatibility, safety, and release
Author readiness
Human owner: @DeryFerd
Before merge
type(scope): outcome.🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.