nemu_set_pac_key

SERVERJshookmcp SOURCE@jshookmcp/jshook

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-vmoranv-jshookmcp/nemu-set-pac-key.md

WHAT IT DOES

What nemu_set_pac_key does on Jshookmcp

AI agents use nemu_set_pac_key to create or update resources in Jshookmcp, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Jshookmcp environment.

RISK

Why nemu_set_pac_key is rated Medium

Sets cryptographic PAC keys in the emulator session; modifiable but reversible configuration.

From the tool's definition Configure the ARMv8.3 Pointer Authentication key set

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs nemu_set_pac_key safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Jshookmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For nemu_set_pac_key, this is the rule to start with:

nemu_set_pac_key Rate-limited

nemu_set_pac_key stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "nemu_set_pac_key": {
      "limits": [
        {
          "counter": "nemu_set_pac_key_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every nemu_set_pac_key call is checked against it from then on.

FAQ

Questions about nemu_set_pac_key

What does the nemu_set_pac_key tool do? +

Configure the ARMv8.3 Pointer Authentication key set used by PACIA/PACIB/AUTIA/AUTIB/PACGA instructions in this emulator session. Set a 128-bit key (32 hex chars) by key slot (ia/ib/da/db/ga) to match keys dumped from a real device via Frida. Note: the emulator signs with an 8-bit PAC field and a 32→64 duplicated modifier, so AUT of pointers signed by real hardware verifies as a mismatch (stripped in-place, control flow preserved) — round-trips inside the emulator stay self-consistent. It is categorised as a Write tool in the Jshookmcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on nemu_set_pac_key? +

Register the Jshook MCP server in PolicyLayer and add a rule for nemu_set_pac_key: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Jshookmcp. Nothing to install.

What risk level is nemu_set_pac_key? +

nemu_set_pac_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit nemu_set_pac_key? +

Yes. Add a rate_limit block to the nemu_set_pac_key rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block nemu_set_pac_key completely? +

Set action: deny in the PolicyLayer policy for nemu_set_pac_key. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides nemu_set_pac_key? +

nemu_set_pac_key is provided by the Jshook MCP server (@jshookmcp/jshook). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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