mirror of
https://github.com/hakril/PythonForWindows
synced 2026-06-08 14:31:45 +00:00
Clement Rouault
39 lines
1.5 KiB
Python
39 lines
1.5 KiB
Python
import ctypes
|
|
import windows
|
|
from windows.winobject.exception import VectoredException
|
|
import windows.generated_def.windef as windef
|
|
from windows.generated_def.winstructs import *
|
|
|
|
|
|
@VectoredException
|
|
def handler(exc):
|
|
print("==Entry of VEH handler==")
|
|
if exc[0].ExceptionRecord[0].ExceptionCode == EXCEPTION_ACCESS_VIOLATION:
|
|
target_addr = ctypes.cast(exc[0].ExceptionRecord[0].ExceptionInformation[1], ctypes.c_void_p).value
|
|
print("Instr at {0} accessed to addr {1}".format(hex(exc[0].ExceptionRecord[0].ExceptionAddress), hex(target_addr)))
|
|
print("Resetting page protection to <PAGE_READWRITE>")
|
|
windows.winproxy.VirtualProtect(target_page, 0x1000, windef.PAGE_READWRITE)
|
|
exc[0].ContextRecord[0].EEFlags.TF = 1
|
|
return windef.EXCEPTION_CONTINUE_EXECUTION
|
|
else:
|
|
print("Exception of type {0}".format(exc[0].ExceptionRecord[0].ExceptionCode))
|
|
print("Resetting page protection to <PAGE_NOACCESS>")
|
|
windows.winproxy.VirtualProtect(target_page, 0x1000, windef.PAGE_NOACCESS)
|
|
return windef.EXCEPTION_CONTINUE_EXECUTION
|
|
|
|
|
|
windows.winproxy.AddVectoredExceptionHandler(0, handler)
|
|
|
|
target_page = windows.current_process.virtual_alloc(0x1000)
|
|
print("Protected page is at <{0}>".format(hex(target_page)))
|
|
print("Setting page protection to <PAGE_NOACCESS>")
|
|
windows.winproxy.VirtualProtect(target_page, 0x1000, windef.PAGE_NOACCESS)
|
|
|
|
print("")
|
|
v = ctypes.c_uint.from_address(target_page).value
|
|
print("Value 1 read")
|
|
|
|
print("")
|
|
v = ctypes.c_uint.from_address(target_page + 0x10).value
|
|
print("Value 2 read")
|