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Add verbatim mode to searches (default true)

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This commit is contained in:
Jan Petykiewicz 2019-03-24 20:39:58 -07:00
parent 3b766be616
commit 522999cd61
1 changed files with 23 additions and 6 deletions
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29
mem_edit/abstract.py
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@ -9,7 +9,8 @@ import copy
import ctypes
import logging
from .utils import ctypes_buffer_t, search_buffer, ctypes_equal
from . import utils
from .utils import ctypes_buffer_t
logging.basicConfig(level=logging.INFO)
@ -240,7 +241,7 @@ class Process(metaclass=ABCMeta):
values = [self.read_memory(base + offset, buffer) for offset, buffer in targets]
return values
def search_addresses(self, addresses: List[int], needle_buffer: ctypes_buffer_t) -> List[int]:
def search_addresses(self, addresses: List[int], needle_buffer: ctypes_buffer_t, verbatim: bool=True) -> List[int]:
"""
Search for the provided value at each of the provided addresses, and return the addresses
where it is found.
@ -249,18 +250,26 @@ class Process(metaclass=ABCMeta):
:param needle_buffer: The value to search for. This should be a ctypes object of the same
sorts as used by .read_memory(...), which will be compared to the contents of
memory at each of the given addresses.
:param verbatim: If True, perform bitwise comparison when searching for needle_buffer.
If False, perform utils.ctypes_equal-based comparison. Default True.
:return: List of addresses where the needle_buffer was found.
"""
found = []
read_buffer = copy.copy(needle_buffer)
if verbatim:
def compare(a, b):
return bytes(read_buffer) == bytes(needle_buffer)
else:
compare = utils.ctypes_equal
for address in addresses:
read = self.read_memory(address, read_buffer)
if ctypes_equal(needle_buffer, read):
self.read_memory(address, read_buffer)
if compare(needle_buffer, read_buffer):
found.append(address)
return found
def search_all_memory(self, needle_buffer, writeable_only=True) -> List[int]:
def search_all_memory(self, needle_buffer: ctypes_buffer_t, writeable_only: bool=True, verbatim: bool=True) -> List[int]:
"""
Search the entire memory space accessible to the process for the provided value.
@ -268,14 +277,22 @@ class Process(metaclass=ABCMeta):
sorts as used by .read_memory(...), which will be compared to the contents of
memory at each accessible address.
:param writeable_only: If True, only search regions where the process has write access.
Default True.
:param verbatim: If True, perform bitwise comparison when searching for needle_buffer.
If False, perform utils.ctypes_equal-based comparison. Default True.
:return: List of addresses where the needle_buffer was found.
"""
found = []
if verbatim:
search = utils.search_buffer_verbatim
else:
search = utils.search_buffer
for start, stop in self.list_mapped_regions(writeable_only):
try:
region_buffer = (ctypes.c_byte * (stop - start))()
self.read_memory(start, region_buffer)
found += [offset + start for offset in search_buffer(needle_buffer, region_buffer)]
found += [offset + start for offset in search(needle_buffer, region_buffer)]
except OSError:
logger.error('Failed to read in range 0x{} - 0x{}'.format(start, stop))
return found