memory_protect
Change memory page protection for a region in the target process. Wraps VirtualProtectEx (Win32) / mprotect (Linux) / mach_vm_protect (macOS). Protection: r (read-only), rw (read-write), rx (read-execute), rwx (all), none (no-access). Returns the old protection. Destructive — audit trail recorded.
This record as markdown: /tools/io-github-vmoranv-jshookmcp/memory-protect.md
What memory_protect does on Jshookmcp
AI agents invoke memory_protect 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 memory_protect is rated High
Modifies process memory protections enabling code injection, privilege escalation, or bypass of security controls.
From the tool's definition Change memory page protection, VirtualProtectEx, mprotect, mach_vm_protect
Attacks that exploit this kind of access
The rule that runs memory_protect 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 memory_protect, this is the rule to start with:
memory_protect 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 memory_protect call is checked against it from then on.
Questions about memory_protect
Change memory page protection for a region in the target process. Wraps VirtualProtectEx (Win32) / mprotect (Linux) / mach_vm_protect (macOS). Protection: r (read-only), rw (read-write), rx (read-execute), rwx (all), none (no-access). Returns the old protection. Destructive — audit trail recorded. 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 memory_protect: 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.
memory_protect 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 memory_protect 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 memory_protect. 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.
memory_protect 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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