pwndbg_hijack_fd · Pwndbg Lldb MCP: Risk & Policy

WHAT IT DOES

What pwndbg_hijack_fd does on Pwndbg Lldb

AI agents invoke pwndbg_hijack_fd to trigger actions in Pwndbg Lldb. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why pwndbg_hijack_fd needs a policy

The name implies hijacking a file descriptor, which would involve modifying a running process's file descriptor table — an active execute/write operation with significant side effects. However, the description is empty, so confidence is reduced. In a debugger context (pwndbg/LLDB), this likely injects or redirects I/O channels in a target process, which classifies as Execute given the runtime manipulation involved.

From the tool's definition Tool name 'pwndbg_hijack_fd' suggests file descriptor hijacking — redirecting/replacing a file descriptor in a running process, which is an active manipulation operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pwndbg_hijack_fd Rate-limited

pwndbg_hijack_fd stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pwndbg_hijack_fd": {
      "limits": [
        {
          "counter": "pwndbg_hijack_fd_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Pwndbg Lldb, so you can run agents against it safely.

FAQ

Questions about pwndbg_hijack_fd

What does the pwndbg_hijack_fd tool do? +

pwndbg_hijack_fd. It is categorised as a Execute tool in the Pwndbg Lldb MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pwndbg_hijack_fd? +

Register the Pwndbg Lldb MCP server in PolicyLayer and add a rule for pwndbg_hijack_fd: 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 Pwndbg Lldb. Nothing to install.

What risk level is pwndbg_hijack_fd? +

pwndbg_hijack_fd is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit pwndbg_hijack_fd? +

Yes. Add a rate_limit block to the pwndbg_hijack_fd 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 pwndbg_hijack_fd completely? +

Set action: deny in the PolicyLayer policy for pwndbg_hijack_fd. 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 pwndbg_hijack_fd? +

pwndbg_hijack_fd is provided by the Pwndbg Lldb MCP server (micro-evaluation-group/pwndbg-lldb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.