frida-17
Frida 17 JavaScript API compatibility checker and fixer. Use when writing, reviewing, or fixing Frida scripts, especially when migrating from older Frida versions. Detects deprecated APIs removed in Frida 17 (May 2025) and provides correct replacements. Covers Module, Memory, Process APIs and common naming conflicts.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/yfe404/frida-17-skill --skill frida-17- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads frida-17 automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Frida 17 Scripting Guide
This skill helps write and fix Frida scripts compatible with Frida 17.0.0 (released May 2025).
Breaking Changes in Frida 17
1. Static Module Methods - REMOVED
// OLD - No longer works in Frida 17
Module.findBaseAddress('libriver.so')
Module.getBaseAddress('libriver.so')
Module.findExportByName(null, 'open')
Module.findExportByName('libc.so', 'open')
Module.getExportByName(null, 'open')
Module.ensureInitialized('libc.so')
Module.enumerateExports('libc.so')
Module.enumerateSymbols('libc.so')
// NEW - Use Process and instance methods instead
var lib = Process.findModuleByName('libriver.so'); // returns Module or null
var lib = Process.getModuleByName('libriver.so'); // throws if not found
lib.base // module base address
lib.findExportByName('open') // returns address or null
lib.getExportByName('open') // throws if not found
lib.enumerateExports() // returns array
lib.enumerateSymbols() // returns array
2. Static Memory Methods - REMOVED
// OLD - No longer works
Memory.readU32(ptr)
Memory.writeU32(ptr, value)
// NEW - Use NativePointer instance methods
ptr.readU32()
ptr.writeU32(value)
3. Legacy Enumeration APIs - REMOVED
// OLD - Callback style removed
Process.enumerateModules({ onMatch: fn, onComplete: fn })
Process.enumerateModulesSync()
// NEW - Returns array directly
Process.enumerateModules()
4. Reserved Function Names - DO NOT OVERRIDE
The following are built-in Frida functions. Defining custom functions with these names causes:
TypeError: cannot define variable 'hexdump'
Reserved names:
hexdump- UsedumpHexinstead for custom hex dump functionsptr- pointer constructor shorthandNULL- null pointer constant
// BAD - conflicts with built-in
function hexdump(ptr, len) { ... }
// GOOD - use different name
function dumpHex(ptr, len) { ... }
NativePointer Methods (Valid in Frida 17)
Conversion:
toInt32()- cast to signed 32-bit integertoNumber()- convert to JavaScript numbertoString([radix])- convert to string
NOT available:
toUInt32()- DOES NOT EXIST, usetoInt32()for sizes < 2^31
Memory reading:
readU8(),readS8(),readU16(),readS16()readU32(),readS32(),readU64(),readS64()readByteArray(length)- returns ArrayBufferreadPointer(),readCString(),readUtf8String()
Memory writing:
writeU8(value),writeS8(value), etc.writeByteArray(bytes)- bytes must be ArrayBuffer or JS arraywritePointer(ptr),writeUtf8String(str)
Pointer arithmetic:
add(rhs),sub(rhs),and(rhs),or(rhs),xor(rhs)shr(n),shl(n),not()isNull(),equals(rhs),compare(rhs)
Java Bridge API (Unchanged in Frida 17)
Java.perform(function() {
var MyClass = Java.use('com.example.MyClass');
// Hook with overload
MyClass.myMethod.overload('int', 'java.lang.String').implementation = function(a, b) {
console.log('Called with: ' + a + ', ' + b);
// Call original
return this.myMethod.overload('int', 'java.lang.String').call(this, a, b);
};
// Hook all overloads
MyClass.myMethod.overloads.forEach(function(overload) {
overload.implementation = function() {
return overload.apply(this, arguments);
};
});
});
Java byte[] handling:
Java byte arrays cannot be passed directly to Memory.alloc().writeByteArray().
Convert manually:
// BAD - throws "expected a buffer-like object"
var hex = dumpHex(Memory.alloc(javaByteArray.length).writeByteArray(javaByteArray), len);
// GOOD - iterate and convert
var hex = "";
for (var i = 0; i < javaByteArray.length; i++) {
hex += ("0" + (javaByteArray[i] & 0xff).toString(16)).slice(-2);
}
Common Patterns for Frida 17
Waiting for a library to load
function waitForLibrary(libName, callback) {
var lib = Process.findModuleByName(libName);
if (lib) {
callback(lib.base);
return;
}
var pollInterval = setInterval(function() {
var lib = Process.findModuleByName(libName);
if (lib) {
clearInterval(pollInterval);
callback(lib.base);
}
}, 500);
}
Hooking libc functions
var libc = Process.findModuleByName('libc.so');
var open = libc ? libc.findExportByName('open') : null;
if (open) {
Interceptor.attach(open, {
onEnter: function(args) {
console.log('open(' + args[0].readCString() + ')');
}
});
}
Custom hex dump function
function dumpHex(ptr, len) {
if (!ptr || ptr.isNull()) return 'null';
try {
var bytes = ptr.readByteArray(len);
if (!bytes) return 'null';
var arr = new Uint8Array(bytes);
var hex = '';
for (var i = 0; i < arr.length; i++) {
hex += ('0' + arr[i].toString(16)).slice(-2);
}
return hex;
} catch (e) {
return 'error: ' + e;
}
}
Checklist for Frida 17 Compatibility
When reviewing a Frida script, check for:
-
Module.findBaseAddress()->Process.findModuleByName().base -
Module.getBaseAddress()->Process.getModuleByName().base -
Module.findExportByName(null, name)->Process.findModuleByName('libc.so').findExportByName(name) -
Module.findExportByName(lib, name)->Process.findModuleByName(lib).findExportByName(name) -
Module.enumerateExports(lib)->Process.getModuleByName(lib).enumerateExports() -
Module.enumerateSymbols(lib)->Process.getModuleByName(lib).enumerateSymbols() -
Memory.readU32(ptr)->ptr.readU32() -
toUInt32()->toInt32()(toUInt32 never existed) -
function hexdump()->function dumpHex()(name conflict) - Java byte[] with
writeByteArray()-> manual hex conversion
References
FAQ
What does the frida-17 skill do?
Frida 17 JavaScript API compatibility checker and fixer. Use when writing, reviewing, or fixing Frida scripts, especially when migrating from older Frida versions. Detects deprecated APIs removed in Frida 17 (May 2025) and provides correct replacements. Covers Module, Memory, Process APIs and common naming conflicts.
How do I install frida-17?
Run npx skills add https://github.com/yfe404/frida-17-skill --skill frida-17 in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/frida-17/ (personal) or .claude/skills/frida-17/ (project).
Which AI agents can use frida-17?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is frida-17 safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains frida-17?
It is published by yfe404 in yfe404/frida-17-skill. It has 2,600 recorded installs.
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