Instantly share code, notes, and snippets.

Embed
What would you like to do?
Frida hooks for malloc functions for further inspection.
'use strict';
var mallocPtr = Module.findExportByName("libc.so.6", "malloc");
var malloc = new NativeFunction(mallocPtr, 'pointer', ['long']);
var freePtr = Module.findExportByName("libc.so.6", "free");
var freel = new NativeFunction(freePtr, 'void', ['pointer']);
var reallocPtr = Module.findExportByName("libc.so.6", "realloc");
var reallocl = new NativeFunction(reallocPtr, 'pointer', ['pointer', 'int']);
var sleepPtr = Module.findExportByName("libc.so.6", "usleep");
var usleepl = new NativeFunction(sleepPtr, 'void', ['int']);
var lock = 0;
var malloc_count = 0;
/* Doesn't work ... :(
var mainPtr = new NativePointer(0x400470);
console.error("Main pointer is " + mainPtr);
var mainl = new NativeFunction(mainPtr, 'int', ['int', 'pointer']);
console.error("Main is mainl ");
*/
/*
Interceptor.replace(mainPtr, new NativeCallback(function (argc, argv) {
console.error("[+] entry point hit - starting heap tracing");
mainl(argc, argv);
}, 'int', ['int', 'pointer']));
*/
Interceptor.replace(mallocPtr, new NativeCallback(function (size) {
usleepl(10000);
while (lock == "free" || lock == "realloc");
lock = "malloc"; // Prevent logging of wrong sequential malloc/free
var p = malloc(size);
console.error("malloc(" + size +") = " + p);
lock = null;
return p;
}, 'pointer', ['int']));
Interceptor.replace(freePtr, new NativeCallback(function (p) {
usleepl(15000);
while (lock == "malloc" || lock == "realloc");
lock = "free";
freel(p);
if (p) console.error("free(" + p + ") = <void>");
lock = null;
}, 'void', ['pointer']));
Interceptor.replace(reallocPtr, new NativeCallback(function (p, size) {
var p_ret;
usleepl(15000);
while (lock == "free" || lock == "malloc");
lock = "realloc";
p_ret = reallocl(p, size);
console.error("realloc(" + p + ", " + size + ") = " + p_ret);
lock = null;
}, 'void', ['pointer', 'int']));
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment