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driver_upgrade.py
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driver_upgrade.py
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"""Code that rewrite part of the LKD driver in memory to upgrade its features"""
import itertools
import windows.native_exec.simple_x86 as x86
import windows.native_exec.simple_x64 as x64
DU_MEMALLOC_IOCTL = 0x220027
DU_KCALL_IOCTL = 0x220037
DU_OUT_IOCTL = 0x220057
DU_IN_IOCTL = 0x220067
DU_TEST_INT3_IOCTL = 0x220077
class DriverUpgrader(object):
PTR_SIZE = None
def __init__(self, kdbg):
self.kdbg = kdbg
self.is_upgraded = False
self.kldbgdrv = kdbg.get_symbol_offset("kldbgdrv")
self.ioctl_array = None
self.ioctl_array_ptr = None
self.next_code_addr = None
self.registered_ioctl = []
def write_pfv_ptr(self, addr, data):
return self.kdbg.write_ptr_p(self.kdbg.virtual_to_physical(addr), data)
def register_test(self):
DOINT3 = x86.MultipleInstr()
DOINT3 += x86.Int3()
DOINT3 += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_TEST_INT3_IOCTL, DOINT3.get_code())
def upgrade_driver(self):
"""Upgrade the driver if needed, retrieve infomation
if driver was already upgraded by a previous session"""
if self.is_driver_already_upgraded():
return self.retrieve_upgraded_info()
return self.full_driver_upgrade()
def is_driver_already_upgraded(self):
raise NotImplementedError("Driver dependent")
def full_driver_upgrade(self):
raise NotImplementedError("Driver dependent")
def retrieve_upgraded_info(self):
"""retrieve all information of the upgraded driver state from memory"""
kldbgdrv = self.kldbgdrv
self.registered_ioctl = self.parse_driver_ioctl_table()
registered_ioctl_code = [x[0] for x in self.registered_ioctl]
if DU_MEMALLOC_IOCTL not in registered_ioctl_code:
# Already upgraded driver cannot perform memory allocation
# It would be complicated to retrieve a stable state
# Perform a full upgrade instead
self.registered_ioctl = []
return self.full_driver_upgrade()
self.next_code_addr = self.kdbg.alloc_memory(0x1000)
self.ioctl_array = self.kdbg.read_ptr(kldbgdrv + self.HANDLE_ARRAY_ADDR)
self.is_upgraded = True
def parse_driver_ioctl_table(self):
kldbgdrv = self.kldbgdrv
handle_array_addr = self.kdbg.read_ptr(kldbgdrv + self.HANDLE_ARRAY_ADDR)
res = []
for i in itertools.count():
ioctl = self.kdbg.read_ptr(handle_array_addr + (self.PTR_SIZE * 2) * i)
code_addr = self.kdbg.read_ptr(handle_array_addr + (self.PTR_SIZE * 2) * i + self.PTR_SIZE)
if ioctl == 0:
return res
res.append((ioctl, code_addr))
def upgrade_driver_add_new_ioctl_handler(self, iocode, code):
"""Add an handler for a new IOCODE
the code of the handler is written somewhere in kernel and the address is added
the the IOCODE/Handler array
"""
next_array_entry = self.ioctl_array + (len(self.registered_ioctl) * (self.PTR_SIZE * 2))
self.kdbg.write_pfv_memory(self.next_code_addr, code)
# Set following entry a 0 for safety
self.write_pfv_ptr(next_array_entry + (2 * self.PTR_SIZE), 0)
self.write_pfv_ptr(next_array_entry + (3 * self.PTR_SIZE), 0)
# Setup new entry
self.write_pfv_ptr(next_array_entry, iocode)
self.write_pfv_ptr(next_array_entry + (1 * self.PTR_SIZE), self.next_code_addr)
self.registered_ioctl.append((iocode, self.next_code_addr))
self.next_code_addr += len(code)
class DriverUpgrader32(DriverUpgrader):
"""Upgrader for windbg_driver_x86.sys (sha-1 D766D6393C3BEC3D4AB1568D373B565BB85EB665)
Explanation:
the function `upgrade_driver` will add some code to the DeviceIoControl handler
The added code will replace the code of the driver initialisation
The new code search the IoControlCode in an array of IOCODE/Handler and call
the corresponding handler with the following parameters:
ESI -> IO_STACK_LOCATION that contains:
: The input buffer size
: The input buffer
: The output buffer size
EDI -> IRP that contains:
: The output buffer
The handler must:
- Verify the size of input / output buffer
- Do whatever it wants
- Write the returned values in the output buffer
- Return 0 if everything went well
- Return an error code otherwise
Adding a new handler is simple, we just need to add the IOCODE/HANDLER to the handler array.
It can be done by calling:
self.upgrade_driver_add_new_ioctl_handler(IOCODE, HANDLER_CODE)
"""
PTR_SIZE = 4
# Offset of the function we will rewrite in the driver
init_function_offset = 0xD10
# Offset of the jump in the iohandle that we will hijack
hijack_offset = 0xb1f
# Offset to the `fail` function end
failed_offset = 0xC2B
# Offset to `success` function end
normal_end = 0xC32
# Address of the pointer to the IOCODE/HANDLER array
HANDLE_ARRAY_ADDR = 0xCBA
FIRST_ARRAY_ADDR = HANDLE_ARRAY_ADDR + 4
# Memory access often used in new handler: based on the parameters expected
IO_STACK_OUPUT_BUFFER_LEN = x86.mem('[ESI + 4]')
IO_STACK_INPUT_BUFFER_LEN = x86.mem('[ESI + 8]')
IO_STACK_INPUT_BUFFER = x86.mem('[ESI + 0x10]')
IRP_OUTPUT_BUFFER = x86.mem('[EDI + 0x3c]')
def _upgrade_driver_inject_base_upgrade(self):
kldbgdrv = self.kldbgdrv
upgrade = x86.MultipleInstr()
IoControlCode_on_stack = x86.create_displacement(base='EBP', disp=-0x30)
IO_STACK_LOCATION_on_stack = x86.create_displacement(base='EBP', disp=-0x34)
IoStatus_on_stack = x86.create_displacement(base='EBP', disp=-0x3c)
IRP_on_stack = x86.create_displacement(base='EBP', disp=+0x0c)
upgrade += x86.Mov('EBX', IoControlCode_on_stack)
upgrade += x86.Mov('EAX', x86.create_displacement(disp=kldbgdrv + self.HANDLE_ARRAY_ADDR))
upgrade += x86.Label(":LOOP")
upgrade += x86.Mov('ECX', x86.create_displacement('EAX'))
upgrade += x86.Cmp('EBX', 'ECX')
upgrade += x86.Jnz(':END')
upgrade += x86.Mov('EAX', x86.create_displacement('EAX', disp=4))
# ESI -> IO_STACK_LOCATION
# EDI -> IRP
upgrade += x86.Mov('ESI', IO_STACK_LOCATION_on_stack)
upgrade += x86.Mov('EDI', IRP_on_stack)
upgrade += x86.Call('EAX')
upgrade += x86.Mov(IoStatus_on_stack, 'EAX')
upgrade += x86.JmpAt(kldbgdrv + self.normal_end)
upgrade += x86.Label(":END")
upgrade += x86.Cmp('ECX', 0)
upgrade += x86.Jnz(':NEXT')
upgrade += x86.JmpAt(kldbgdrv + self.failed_offset)
upgrade += x86.Label(":NEXT")
upgrade += x86.Add('EAX', 8)
upgrade += x86.Jmp(':LOOP')
# Write new driver code
self.kdbg.write_pfv_memory(kldbgdrv + self.init_function_offset, str(upgrade.get_code()))
# Write first array dest
self.write_pfv_ptr(kldbgdrv + self.HANDLE_ARRAY_ADDR, kldbgdrv + self.FIRST_ARRAY_ADDR)
self.write_pfv_ptr(kldbgdrv + self.FIRST_ARRAY_ADDR, 0)
self.write_pfv_ptr(kldbgdrv + self.FIRST_ARRAY_ADDR + 4, 0)
# Jump hijack
jump_init_function = x86.Jmp(self.init_function_offset - (self.hijack_offset))
self.kdbg.write_pfv_memory(kldbgdrv + self.hijack_offset, str(jump_init_function.get_code()))
self.is_upgraded = True
self.ioctl_array = kldbgdrv + self.FIRST_ARRAY_ADDR
self.ioctl_array_ptr = kldbgdrv + self.HANDLE_ARRAY_ADDR
self.next_code_addr = kldbgdrv + self.init_function_offset + len(upgrade.get_code())
def is_driver_already_upgraded(self):
"""Check if the driver have already been upgraded by checking if the jump hijack is in place"""
jump_hijack = x86.Jmp(self.init_function_offset - (self.hijack_offset)).get_code()
mem = self.kdbg.read_virtual_memory(self.kldbgdrv + self.hijack_offset, len(jump_hijack))
return mem == str(jump_hijack)
def full_driver_upgrade(self):
"""Upgrade the driver, bootstrap it and add new features
We don't want to write all the handler in the driver init code.
We bootstrap by only adding the `mem_alloc` feature and use it to:
- Alloc a new page for the IOCODE/HANDLER array
- Alloc a new page for the handlers code
We move the IOCODE/HANDLER array
Finally we add the other features
"""
self._upgrade_driver_inject_base_upgrade()
self.register_alloc_memory()
new_ioctl_array_page = self.kdbg.alloc_memory(0x1000)
alloc_ioctl, alloc_code_addr = self.registered_ioctl[0]
# Write first array dest
self.write_pfv_ptr(self.ioctl_array_ptr, new_ioctl_array_page)
self.write_pfv_ptr(new_ioctl_array_page, alloc_ioctl)
self.write_pfv_ptr(new_ioctl_array_page + 4, alloc_code_addr)
self.write_pfv_ptr(new_ioctl_array_page + 8, 0)
self.write_pfv_ptr(new_ioctl_array_page + 0xc, 0)
self.ioctl_array = new_ioctl_array_page
new_code_page = self.kdbg.alloc_memory(0x1000)
self.next_code_addr = new_code_page
# Register other ioctl
self.register_kernel_call()
self.register_io_in()
self.register_io_out()
def register_alloc_memory(self):
ExAllocatePoolWithTag = self.kdbg.get_symbol_offset("nt!ExAllocatePoolWithTag")
if ExAllocatePoolWithTag is None:
raise ValueError("Could not resolve <ExAllocatePoolWithTag>")
INPUT_BUFFER_ALLOC_TYPE = x86.mem('[ECX]')
INPUT_BUFFER_ALLOC_SIZE = x86.mem('[ECX + 4]')
INPUT_BUFFER_ALLOC_TAG = x86.mem('[ECX + 8]')
Alloc_IOCTL = x86.MultipleInstr()
Alloc_IOCTL += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0xc)
Alloc_IOCTL += x86.Jnz(':FAIL')
Alloc_IOCTL += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_TAG)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_SIZE)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EBX', INPUT_BUFFER_ALLOC_TYPE)
Alloc_IOCTL += x86.Push('EBX')
Alloc_IOCTL += x86.Mov('EAX', ExAllocatePoolWithTag)
Alloc_IOCTL += x86.Call('EAX')
Alloc_IOCTL += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
Alloc_IOCTL += x86.Mov(x86.mem('[EDX]'), 'EAX')
Alloc_IOCTL += x86.Xor('EAX', 'EAX')
Alloc_IOCTL += x86.Ret()
Alloc_IOCTL += x86.Label(":FAIL")
Alloc_IOCTL += x86.Mov('EAX', 0x0C000000D)
Alloc_IOCTL += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_MEMALLOC_IOCTL, Alloc_IOCTL.get_code())
def register_kernel_call(self):
# expect in buffer: the address to call and all dword to push on the stack
CCall_IOCTL = x86.MultipleInstr()
CCall_IOCTL += x86.Mov('EAX', self.IO_STACK_INPUT_BUFFER_LEN)
CCall_IOCTL += x86.Cmp('EAX', 0)
CCall_IOCTL += x86.Jz(":FAIL") # Need at least the function to call
CCall_IOCTL += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
CCall_IOCTL += x86.Label(':PUSH_NEXT_ARG')
CCall_IOCTL += x86.Cmp('EAX', 4)
CCall_IOCTL += x86.Jz(":DO_CALL")
CCall_IOCTL += x86.Sub('EAX', 4)
INPUT_BUFFER_NEXT_ARG = x86.create_displacement(base='ECX', index='EAX')
CCall_IOCTL += x86.Mov('EBX', INPUT_BUFFER_NEXT_ARG)
CCall_IOCTL += x86.Push('EBX')
CCall_IOCTL += x86.Jmp(':PUSH_NEXT_ARG')
CCall_IOCTL += x86.Label(":DO_CALL")
CCall_IOCTL += x86.Mov('EAX', x86.mem('[ECX]'))
CCall_IOCTL += x86.Call('EAX')
CCall_IOCTL += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
CCall_IOCTL += x86.Mov(x86.mem('[EDX]'), 'EAX')
CCall_IOCTL += x86.Xor('EAX', 'EAX')
CCall_IOCTL += x86.Ret()
CCall_IOCTL += x86.Label(":FAIL")
CCall_IOCTL += x86.Mov('EAX', 0x0C000000D)
CCall_IOCTL += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_KCALL_IOCTL, CCall_IOCTL.get_code())
def register_io_out(self):
out_ioctl = x86.MultipleInstr()
INPUT_BUFFER_SIZE = x86.mem('[ECX]')
INPUT_BUFFER_PORT = x86.mem('[ECX + 4]')
INPUT_BUFFER_VALUE = x86.mem('[ECX + 8]')
out_ioctl += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0xc) # size indicator / port / value
out_ioctl += x86.Jnz(":FAIL")
out_ioctl += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
out_ioctl += x86.Mov('EDX', INPUT_BUFFER_PORT)
out_ioctl += x86.Mov('EAX', INPUT_BUFFER_VALUE)
out_ioctl += x86.Mov('ECX', INPUT_BUFFER_SIZE)
out_ioctl += x86.Cmp('ECX', 0x1)
out_ioctl += x86.Jnz(":OUT_2_OR_4")
out_ioctl += x86.Out('DX', 'AL')
out_ioctl += x86.Jmp(':SUCCESS')
out_ioctl += x86.Label(":OUT_2_OR_4")
out_ioctl += x86.Cmp('ECX', 0x2)
out_ioctl += x86.Jnz(":OUT_4")
out_ioctl += x86.Out('DX', 'AX')
out_ioctl += x86.Jmp(':SUCCESS')
out_ioctl += x86.Label(":OUT_4")
out_ioctl += x86.Out('DX', 'EAX')
out_ioctl += x86.Label(":SUCCESS")
out_ioctl += x86.Xor('EAX', 'EAX')
out_ioctl += x86.Ret()
out_ioctl += x86.Label(":FAIL")
out_ioctl += x86.Mov('EAX', 0x0C000000D)
out_ioctl += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_OUT_IOCTL, out_ioctl.get_code())
def register_io_in(self):
in_ioctl = x86.MultipleInstr()
INPUT_BUFFER_PORT = x86.mem('[ECX + 4]')
INPUT_BUFFER_SIZE = x86.mem('[ECX]')
in_ioctl += x86.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 8) # size indicator / port
in_ioctl += x86.Jnz(":FAIL")
in_ioctl += x86.Cmp(self.IO_STACK_OUPUT_BUFFER_LEN, 0x4)
in_ioctl += x86.Jnz(":FAIL")
in_ioctl += x86.Mov('ECX', self.IO_STACK_INPUT_BUFFER)
in_ioctl += x86.Mov('EDX', INPUT_BUFFER_PORT)
in_ioctl += x86.Mov('ECX', INPUT_BUFFER_SIZE)
in_ioctl += x86.Xor('EAX', 'EAX')
in_ioctl += x86.Cmp('ECX', 0x1)
in_ioctl += x86.Jnz(":IN_2_OR_4")
in_ioctl += x86.In('AL', 'DX')
in_ioctl += x86.Jmp(':SUCCESS')
in_ioctl += x86.Label(":IN_2_OR_4")
in_ioctl += x86.Cmp('ECX', 0x2)
in_ioctl += x86.Jnz(":IN_4")
in_ioctl += x86.In('AX', 'DX')
in_ioctl += x86.Jmp(':SUCCESS')
in_ioctl += x86.Label(":IN_4")
in_ioctl += x86.In('EAX', 'DX')
in_ioctl += x86.Label(":SUCCESS")
in_ioctl += x86.Mov('EDX', self.IRP_OUTPUT_BUFFER)
in_ioctl += x86.Mov(x86.mem('[EDX]'), 'EAX')
in_ioctl += x86.Xor('EAX', 'EAX')
in_ioctl += x86.Ret()
in_ioctl += x86.Label(":FAIL")
in_ioctl += x86.Mov('EAX', 0x0C000000D)
in_ioctl += x86.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_IN_IOCTL, in_ioctl.get_code())
class DriverUpgrader64(DriverUpgrader):
"""Upgrader for windbg_driver_x64.sys (sha-1 6F5B29FFFB021BF80CA91D6D67CFC019D63F7175)
Explanation:
the function `upgrade_driver` will add some code to the DeviceIoControl handler
The added code will be written in in some empty space after the driver code
The new code search the IoControlCode in an array of IOCODE/Handler and call
the corresponding handler with the following parameters:
RSI -> IO_STACK_LOCATION that contains:
: The input buffer size
: The input buffer
: The output buffer size
RDI -> IRP that contains:
: The output buffer
The handler must:
- Verify the size of input / output buffer
- Do whatever it wants
- Write the returned values in the output buffer
- Return 0 if everythin went well
- Return an error code otherwise
Adding a new handler is simple, we just need to add the IOCODE/HANDLER to the handler array.
It can be done by calling:
self.upgrade_driver_add_new_ioctl_handler(IOCODE, HANDLER_CODE)
"""
PTR_SIZE = 8
# Offset of the code in the iohandle that we will hijack
hijack_offset = 0x50e8
# Offset of the normal code path in the iohandle for the standard IO_CODE
normal_io_offset = 0x50f1
# Offset of the function we will rewrite in the driver
init_driver_offset = 0x523a
# Offset to the `fail` function end
fail_offset = 0x50f7
# Offset to `success` function end
normal_end_offset = 0x51d8
# Address of the pointer to the IOCODE/HANDLER array
HANDLE_ARRAY_ADDR = 0x5300
FIRST_ARRAY_ADDR = HANDLE_ARRAY_ADDR + 8
# Memory access often used in new handler: based on the parameters expected
IO_STACK_INPUT_BUFFER_LEN = x64.mem('[RSI + 0x10]')
IO_STACK_INPUT_BUFFER = x64.mem('[RSI + 0x20]')
IRP_OUTPUT_BUFFER = x64.mem('[RDI + 0x70]')
NORMAL_IO_CODE = 0x22C007
def _upgrade_driver_inject_base_upgrade(self):
kldbgdrv = self.kldbgdrv
upgrade = x64.MultipleInstr()
# R14 : IOCODE
# RSI -> IO_STACK_LOCATION
# RDI -> IRP
upgrade = x64.MultipleInstr()
upgrade += x64.Cmp('R14', self.NORMAL_IO_CODE)
upgrade += x64.Jz(self.normal_io_offset - (self.init_driver_offset + len(upgrade.get_code())))
upgrade += x64.Mov('Rax', x64.create_displacement(disp=kldbgdrv + self.HANDLE_ARRAY_ADDR))
upgrade += x64.Label(":LOOP")
upgrade += x64.Mov('RCX', x64.create_displacement('RAX'))
upgrade += x64.Cmp('R14', 'RCX')
upgrade += x64.Jnz(':END')
upgrade += x64.Mov('RAX', x64.create_displacement('RAX', disp=8))
upgrade += x64.Call('RAX')
upgrade += x64.Mov('RBX', 'RAX')
upgrade += x64.JmpAt(kldbgdrv + self.normal_end_offset)
upgrade += x64.Label(":END")
upgrade += x64.Cmp('RCX', 0)
upgrade += x64.Jnz(':NEXT')
upgrade += x64.JmpAt(kldbgdrv + self.fail_offset)
upgrade += x64.Label(":NEXT")
upgrade += x64.Add('RAX', 0x10)
upgrade += x64.Jmp(':LOOP')
self.kdbg.write_pfv_memory(kldbgdrv + self.init_driver_offset, str(upgrade.get_code()))
# Write first array dest
self.write_pfv_ptr(kldbgdrv + self.HANDLE_ARRAY_ADDR, kldbgdrv + self.FIRST_ARRAY_ADDR)
self.write_pfv_ptr(kldbgdrv + self.FIRST_ARRAY_ADDR, 0)
self.write_pfv_ptr(kldbgdrv + self.FIRST_ARRAY_ADDR + 8, 0)
# Jump hijack
jump_init_function = x64.Jmp(self.init_driver_offset - (self.hijack_offset))
self.kdbg.write_pfv_memory(kldbgdrv + self.hijack_offset, str(jump_init_function.get_code()))
self.ioctl_array = kldbgdrv + self.FIRST_ARRAY_ADDR
self.ioctl_array_ptr = kldbgdrv + self.HANDLE_ARRAY_ADDR
self.next_code_addr = kldbgdrv + self.init_driver_offset + len(upgrade.get_code())
self.is_upgraded = True
def is_driver_already_upgraded(self):
"""Check if the driver have already been upgraded by checking if the jump hijack is in place"""
jump_hijack = x64.Jmp(self.init_driver_offset - (self.hijack_offset)).get_code()
mem = self.kdbg.read_virtual_memory(self.kldbgdrv + self.hijack_offset, len(jump_hijack))
return mem == str(jump_hijack)
def full_driver_upgrade(self):
"""Upgrade the driver, bootstrap it and add new features
We don't want to write all the handler in the driver init code.
We bootstrap be only adding the `mem_alloc` feature and use it to:
- Alloc a new page for the IOCODE/HANDLER array
- Alloc a new page for the handlers code
We move the IOCODE/HANDLER array
Finally we add the other features
"""
self._upgrade_driver_inject_base_upgrade()
self.register_alloc_memory()
new_ioctl_array_page = self.kdbg.alloc_memory(0x1000)
alloc_ioctl, alloc_code_addr = self.registered_ioctl[0]
# Write first array dest
self.write_pfv_ptr(self.ioctl_array_ptr, new_ioctl_array_page)
self.write_pfv_ptr(new_ioctl_array_page, alloc_ioctl)
self.write_pfv_ptr(new_ioctl_array_page + 0x8, alloc_code_addr)
self.write_pfv_ptr(new_ioctl_array_page + 0x10, 0)
self.write_pfv_ptr(new_ioctl_array_page + 0x18, 0)
self.ioctl_array = new_ioctl_array_page
new_code_page = self.kdbg.alloc_memory(0x1000)
self.next_code_addr = new_code_page
# Register other IOCTL
self.register_kernel_call()
self.register_io_in()
self.register_io_out()
def register_alloc_memory(self):
ExAllocatePoolWithTag = self.kdbg.get_symbol_offset("nt!ExAllocatePoolWithTag")
if ExAllocatePoolWithTag is None:
raise ValueError("Could not resolve <ExAllocatePoolWithTag>")
INPUT_BUFFER_ALLOC_TYPE = x64.mem('[RCX]')
INPUT_BUFFER_ALLOC_SIZE = x64.mem('[RCX + 0x8]')
INPUT_BUFFER_ALLOC_TAG = x64.mem('[RCX + 0x10]')
Alloc_IOCTL = x64.MultipleInstr()
Alloc_IOCTL += x64.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0x18)
Alloc_IOCTL += x64.Jnz(':FAIL')
Alloc_IOCTL += x64.Mov('RCX', self.IO_STACK_INPUT_BUFFER)
Alloc_IOCTL += x64.Mov('R8', INPUT_BUFFER_ALLOC_TAG)
Alloc_IOCTL += x64.Mov('RDX', INPUT_BUFFER_ALLOC_SIZE)
Alloc_IOCTL += x64.Mov('RCX', INPUT_BUFFER_ALLOC_TYPE)
Alloc_IOCTL += x64.Mov('RAX', ExAllocatePoolWithTag)
Alloc_IOCTL += x64.Call('RAX')
Alloc_IOCTL += x64.Mov('RBX', self.IRP_OUTPUT_BUFFER)
Alloc_IOCTL += x64.Mov(x64.mem('[RBX]'), 'RAX')
Alloc_IOCTL += x64.Xor('RAX', 'RAX')
Alloc_IOCTL += x64.Ret()
Alloc_IOCTL += x64.Label(":FAIL")
Alloc_IOCTL += x64.Mov('RAX', 0x0C000000D)
Alloc_IOCTL += x64.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_MEMALLOC_IOCTL, Alloc_IOCTL.get_code())
def register_kernel_call(self):
# expect in buffer: the address to call and all dword to push on the stack
CCall_IOCTL = x64.MultipleInstr()
CCall_IOCTL += x64.Mov('RAX', self.IO_STACK_INPUT_BUFFER_LEN)
CCall_IOCTL += x64.Cmp('RAX', 0)
CCall_IOCTL += x64.Jz(":FAIL") # Need at least the function to call
CCall_IOCTL += x64.Mov('R15', 4 * 8) # Size to pop on the stack at the end (4 * push RDI)
CCall_IOCTL += x64.Mov('R10', self.IO_STACK_INPUT_BUFFER)
CCall_IOCTL += x64.Label(':PUSH_NEXT_ARG')
CCall_IOCTL += x64.Cmp('RAX', (8 * 5))
CCall_IOCTL += x64.Jbe(":SETUP_REG_ARGS")
CCall_IOCTL += x64.Sub('RAX', 8)
INPUT_BUFFER_NEXT_ARG = x64.create_displacement(base='R10', index='RAX')
CCall_IOCTL += x64.Mov('RBX', INPUT_BUFFER_NEXT_ARG)
CCall_IOCTL += x64.Push('RBX')
CCall_IOCTL += x64.Add('R15', 8) # Add at Size to pop on the stack at the end
CCall_IOCTL += x64.Jmp(':PUSH_NEXT_ARG')
CCall_IOCTL += x64.Label(":SETUP_REG_ARGS")
# Could be done in a loop
# But do I really want to generate x86 in a loop..
CCall_IOCTL += x64.Cmp('RAX', (8 * 5))
CCall_IOCTL += x64.Jz(":SETUP_4_ARGS")
CCall_IOCTL += x64.Cmp('RAX', (8 * 4))
CCall_IOCTL += x64.Jz(":SETUP_3_ARGS")
CCall_IOCTL += x64.Cmp('RAX', (8 * 3))
CCall_IOCTL += x64.Jz(":SETUP_2_ARGS")
CCall_IOCTL += x64.Cmp('RAX', (8 * 2))
CCall_IOCTL += x64.Jz(":SETUP_1_ARGS")
CCall_IOCTL += x64.Jmp(":SETUP_0_ARGS")
CCall_IOCTL += x64.Label(":SETUP_4_ARGS")
CCall_IOCTL += x64.Mov('R9', x64.mem('[R10 + 0x20]'))
CCall_IOCTL += x64.Label(":SETUP_3_ARGS")
CCall_IOCTL += x64.Mov('R8', x64.mem('[R10 + 0x18]'))
CCall_IOCTL += x64.Label(":SETUP_2_ARGS")
CCall_IOCTL += x64.Mov('RDX', x64.mem('[R10 + 0x10]'))
CCall_IOCTL += x64.Label(":SETUP_1_ARGS")
CCall_IOCTL += x64.Mov('RCX', x64.mem('[R10 + 8]'))
CCall_IOCTL += x64.Label(":SETUP_0_ARGS")
CCall_IOCTL += x64.Mov('RAX', x64.mem('[R10]'))
# Fix Reserve space (calling convention)
CCall_IOCTL += x64.Push('RDI')
CCall_IOCTL += x64.Push('RDI')
CCall_IOCTL += x64.Push('RDI')
CCall_IOCTL += x64.Push('RDI')
CCall_IOCTL += x64.Call('RAX')
CCall_IOCTL += x64.Mov('RDX', self.IRP_OUTPUT_BUFFER)
CCall_IOCTL += x64.Mov(x64.mem('[RDX]'), 'RAX')
CCall_IOCTL += x64.Xor('RAX', 'RAX')
CCall_IOCTL += x64.Add('RSP', 'R15')
CCall_IOCTL += x64.Ret()
CCall_IOCTL += x64.Label(":FAIL")
CCall_IOCTL += x64.Mov('RAX', 0x0C000000D)
CCall_IOCTL += x64.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_KCALL_IOCTL, CCall_IOCTL.get_code())
def register_io_out(self):
out_ioctl = x64.MultipleInstr()
INPUT_BUFFER_SIZE = x64.mem('[RCX]')
INPUT_BUFFER_PORT = x64.mem('[RCX + 8]')
INPUT_BUFFER_VALUE = x64.mem('[RCX + 0x10]')
out_ioctl += x64.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0x18) # size indicator / port / value
out_ioctl += x64.Jnz(":FAIL")
out_ioctl += x64.Mov('RCX', self.IO_STACK_INPUT_BUFFER)
out_ioctl += x64.Mov('RDX', INPUT_BUFFER_PORT)
out_ioctl += x64.Mov('RAX', INPUT_BUFFER_VALUE)
out_ioctl += x64.Mov('RCX', INPUT_BUFFER_SIZE)
out_ioctl += x64.Cmp('RCX', 0x1)
out_ioctl += x64.Jnz(":OUT_2_OR_4")
out_ioctl += x64.Out('DX', 'AL')
out_ioctl += x64.Jmp(':SUCCESS')
out_ioctl += x64.Label(":OUT_2_OR_4")
out_ioctl += x64.Cmp('RCX', 0x2)
out_ioctl += x64.Jnz(":OUT_4")
out_ioctl += x64.Out('DX', 'AX')
out_ioctl += x64.Jmp(':SUCCESS')
out_ioctl += x64.Label(":OUT_4")
out_ioctl += x64.Out('DX', 'EAX')
out_ioctl += x64.Label(":SUCCESS")
out_ioctl += x64.Xor('RAX', 'RAX')
out_ioctl += x64.Ret()
out_ioctl += x64.Label(":FAIL")
out_ioctl += x64.Mov('RAX', 0x0C000000D)
out_ioctl += x64.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_OUT_IOCTL, out_ioctl.get_code())
def register_io_in(self):
in_ioctl = x64.MultipleInstr()
INPUT_BUFFER_SIZE = x64.mem('[RCX]')
INPUT_BUFFER_PORT = x64.mem('[RCX + 8]')
in_ioctl += x64.Cmp(self.IO_STACK_INPUT_BUFFER_LEN, 0x10) # size indicator / port
in_ioctl += x64.Jnz(":FAIL")
in_ioctl += x64.Mov('RCX', self.IO_STACK_INPUT_BUFFER)
in_ioctl += x64.Mov('RDX', INPUT_BUFFER_PORT)
in_ioctl += x64.Mov('RCX', INPUT_BUFFER_SIZE)
in_ioctl += x64.Cmp('RCX', 0x1)
in_ioctl += x64.Jnz(":OUT_2_OR_4")
in_ioctl += x64.In('AL', 'DX')
in_ioctl += x64.Jmp(':SUCCESS')
in_ioctl += x64.Label(":OUT_2_OR_4")
in_ioctl += x64.Cmp('RCX', 0x2)
in_ioctl += x64.Jnz(":OUT_4")
in_ioctl += x64.In('AX', 'DX')
in_ioctl += x64.Jmp(':SUCCESS')
in_ioctl += x64.Label(":OUT_4")
in_ioctl += x64.In('EAX', 'DX')
in_ioctl += x64.Label(":SUCCESS")
in_ioctl += x64.Mov('RDX', self.IRP_OUTPUT_BUFFER)
in_ioctl += x64.Mov(x64.mem('[RDX]'), 'RAX')
in_ioctl += x64.Xor('RAX', 'RAX')
in_ioctl += x64.Ret()
in_ioctl += x64.Label(":FAIL")
in_ioctl += x64.Mov('RAX', 0x0C000000D)
in_ioctl += x64.Ret()
self.upgrade_driver_add_new_ioctl_handler(DU_IN_IOCTL, in_ioctl.get_code())