# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
#
import logging
from typing import List
from volatility.framework import exceptions, interfaces
from volatility.framework import renderers, constants, contexts
from volatility.framework.automagic import mac
from volatility.framework.configuration import requirements
from volatility.framework.interfaces import plugins
from volatility.framework.renderers import format_hints
vollog = logging.getLogger(__name__)
[docs]class Check_syscall(plugins.PluginInterface):
"""Check system call table for hooks."""
[docs] @classmethod
def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
return [
requirements.TranslationLayerRequirement(name = 'primary',
description = 'Memory layer for the kernel',
architectures = ["Intel32", "Intel64"]),
requirements.SymbolTableRequirement(name = "darwin", description = "Mac kernel symbols")
]
def _generator(self):
mac.MacUtilities.aslr_mask_symbol_table(self.context, self.config['darwin'], self.config['primary'])
kernel = contexts.Module(self._context, self.config['darwin'], self.config['primary'], 0)
nsysent = kernel.object_from_symbol(symbol_name = "nsysent")
table = kernel.object_from_symbol(symbol_name = "sysent")
# smear help
num_ents = min(nsysent, table.count)
if num_ents > 1024:
num_ents = 1024
for (i, ent) in enumerate(table):
try:
call_addr = ent.sy_call.dereference().vol.offset
except exceptions.InvalidPagedAddressException:
continue
if not call_addr or call_addr == 0:
continue
symbols = list(self.context.symbol_space.get_symbols_by_location(call_addr))
if len(symbols) > 0:
sym_name = str(symbols[0].split(constants.BANG)[1]) if constants.BANG in symbols[0] else \
str(symbols[0])
else:
sym_name = "UNKNOWN"
yield (0, (format_hints.Hex(table.vol.offset), "SysCall", i, format_hints.Hex(call_addr), sym_name))
[docs] def run(self):
return renderers.TreeGrid([("Table Address", format_hints.Hex), ("Table Name", str), ("Index", int),
("Handler Address", format_hints.Hex), ("Handler Symbol", str)], self._generator())