Frida script review

Frida Script Review

Use this skill before running public, generated, or mutation-heavy Frida scripts.

Review Pass

1. Identify platform assumptions: Android, iOS, native, desktop, Gadget.
2. Identify mutation points: return replacement, argument rewrite, file writes, process control, network changes.
3. Check timing: spawn vs attach, module load, class loader, ObjC availability.
4. Check safety: null pointers, overloads, string lifetimes, retval copies, recursion, noisy hooks.
5. Reduce broad bundles to the hooks relevant to the target behavior.

Red Flags

• Blind universal bypass without proof of which hook fired.
• Native pointer reads without null or length checks.
• String replacement into fixed buffers without proving buffer size.
• Java method hook without explicit overload where overloads exist.
• ObjC selector assumed without checking ObjC.available and class/method presence.
• retval or argument wrappers stored for later use instead of copied.
• Logs that print secrets unnecessarily.

Hardening Pattern

Before mutation:

console.log("hook fired", targetName);
console.log(Thread.backtrace(this.context, Backtracer.ACCURATE)
  .map(DebugSymbol.fromAddress).join("\n"));

After proof:

if (shouldPatchThisCall()) {
  retval.replace(1);
}

Output

Return:

• Risk summary.
• Exact lines or hook blocks to keep, remove, or change.
• Safer reviewed script or patch.
• Verification command and expected proof.

References

• Frida JavaScript API: https://frida.re/docs/javascript-api/
• Frida troubleshooting: https://frida.re/docs/troubleshooting/
• Frida CodeShare: https://codeshare.frida.re/