Seth/PSFree
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Re-Adding ChendoChap Patches For 900

Browse Source 
TODO: find wich patch is missing for games giving Black Screen
This commit is contained in:
Kameleon
2025-05-23 07:36:08 -06:00
parent 5882f2335e
commit 9b6d59984a
3 changed files with 47 additions and 123 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kpatch/900.c
+47 -123
View File
@@ -15,8 +15,6 @@ 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"
@@ -55,129 +53,55 @@ void restore(struct kexec_args *uap) {
void do_patch(void) {
// offset to fast_syscall()
const size_t off_fast_syscall = 0x1c0;
void * const kbase = (void *)rdmsr(0xc0000082) - off_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);
//veriPatch
//ChendoChap Patches For 900
const size_t KERNEL_enable_syscalls_1 = 0x490;
const size_t KERNEL_enable_syscalls_2 = 0x4B5;
const size_t KERNEL_enable_syscalls_3 = 0x4B9;
const size_t KERNEL_enable_syscalls_4 = 0x4C2;
const size_t KERNEL_mprotect = 0x80B8D;
const size_t KERNEL_prx = 0x23AEC4;
const size_t KERNEL_mmap_1 = 0x16632A;
const size_t KERNEL_mmap_2 = 0x16632D;
const size_t KERNEL_dlsym_1 = 0x23B67F;
const size_t KERNEL_dlsym_2 = 0x221b40;
const size_t KERNEL_setuid = 0x1A06;
const size_t KERNEL_bzero = 0x2713FD;
const size_t KERNEL_pagezero = 0x271441;
const size_t KERNEL_memcpy = 0x2714BD;
const size_t KERNEL_pagecopy = 0x271501;
const size_t KERNEL_copyin = 0x2716AD;
const size_t KERNEL_copyinstr = 0x271B5D;
const size_t KERNEL_copystr = 0x271C2D;
const size_t KERNEL_veriPatch = 0x626874;
const size_t KERNEL_setcr0_patch = 0x3ade3B;
write32(kbase, KERNEL_enable_syscalls_1, 0);
write16(kbase, KERNEL_enable_syscalls_2, 0x9090);
write16(kbase, KERNEL_enable_syscalls_3, 0x9090);
write8(kbase, KERNEL_enable_syscalls_4, 0xEB);
write8(kbase, KERNEL_mmap_1, 0x37);
write8(kbase, KERNEL_mmap_2, 0x37);
write32(kbase, KERNEL_mprotect, 0);
write8(kbase, KERNEL_dlsym_1, 0xEB);
write32(kbase, KERNEL_dlsym_2, 0xC3C03148);
write8(kbase, KERNEL_setuid, 0xEB);
write16(kbase, KERNEL_prx, 0xE990);
write8(kbase, KERNEL_bzero, 0xEB);
write8(kbase, KERNEL_pagezero, 0xEB);
write8(kbase, KERNEL_memcpy, 0xEB);
write8(kbase, KERNEL_pagecopy, 0xEB);
write8(kbase, KERNEL_copyin, 0xEB);
write8(kbase, KERNEL_copyinstr, 0xEB);
write8(kbase, KERNEL_copystr, 0xEB);
write16(kbase, KERNEL_veriPatch, 0x9090);
write32(kbase, KERNEL_setcr0_patch, 0xC3C7220F);
const size_t offset_sysent_11 = 0x1100520;
write32(kbase, offset_sysent_11, 2);
write64(kbase, offset_sysent_11 + 8, kbase + 0x4c7ad);
write32(kbase, offset_sysent_11 + 0x2c, 1);
enable_cr0_wp();
}
}
kpatch/900.elf
BIN
View File
Binary file not shown.
kpatch/900.o
BIN
View File
Binary file not shown.