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This commit is contained in:
Al Azif
2025-05-12 14:30:43 -07:00
commit b9f5957555
28 changed files with 6529 additions and 0 deletions
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176
src/kpatch/80x.c Normal file
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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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SECTIONS
{
.text : { *(.text.start) *(.text) }
.rodata : { *(.rodata) }
.data : { *(.data) }
.bss : { *(.bss) }
/DISCARD/ : { *(.comment* .note*) }
}

28
src/kpatch/types.h Normal file
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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;

61
src/kpatch/utils.h Normal file
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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;
}