nemu_alloc_memory
Allocate raw guest memory (NOT a JNI handle — a real char* address). Optionally fill with initial data via fillBytes (base64). Returns the guest address to pass as an integer arg to call_symbol. Use at the start of a session to stage encrypted blobs for a native decrypt/signing routine, then read...
This record as markdown: /tools/io-github-vmoranv-jshookmcp/nemu-alloc-memory.md
What nemu_alloc_memory does on Jshookmcp
AI agents invoke nemu_alloc_memory to trigger actions in Jshookmcp. 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 nemu_alloc_memory is rated High
Allocates executable memory and stages data for native code execution, enabling arbitrary guest operations.
From the tool's definition Allocate raw guest memory, pass as integer arg to call_symbol, stage encrypted blobs
Attacks that exploit this kind of access
The rule that runs nemu_alloc_memory 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_alloc_memory, this is the rule to start with:
nemu_alloc_memory 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Jshookmcp, apply this rule, and every nemu_alloc_memory call is checked against it from then on.
Questions about nemu_alloc_memory
Allocate raw guest memory (NOT a JNI handle — a real char* address). Optionally fill with initial data via fillBytes (base64). Returns the guest address to pass as an integer arg to call_symbol. Use at the start of a session to stage encrypted blobs for a native decrypt/signing routine, then read the output with nemu_read_memory. It is categorised as a Execute tool in the Jshookmcp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Jshook MCP server in PolicyLayer and add a rule for nemu_alloc_memory: 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.
nemu_alloc_memory is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the nemu_alloc_memory 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.
Set action: deny in the PolicyLayer policy for nemu_alloc_memory. 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.
nemu_alloc_memory 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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