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134 lines
4.1 KiB
Python
134 lines
4.1 KiB
Python
# This file is Copyright 2020 Volatility Foundation and licensed under the Volatility Software License 1.0
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# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
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#
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import logging
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from typing import List
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import volatility3.framework.symbols.linux.utilities.modules as linux_utilities_modules
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from volatility3.framework import interfaces, renderers, symbols
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from volatility3.framework.configuration import requirements
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from volatility3.framework.renderers import format_hints
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from volatility3.framework.symbols import linux
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from volatility3.plugins.linux import lsmod
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vollog = logging.getLogger(__name__)
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class Check_idt(interfaces.plugins.PluginInterface):
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"""Checks if the IDT has been altered"""
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_required_framework_version = (2, 0, 0)
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@classmethod
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def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
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return [
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requirements.ModuleRequirement(
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name="kernel",
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description="Linux kernel",
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architectures=["Intel32", "Intel64"],
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),
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requirements.VersionRequirement(
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name="linux_utilities_modules",
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component=linux_utilities_modules.Modules,
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version=(1, 0, 0),
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),
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requirements.VersionRequirement(
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name="linuxutils", component=linux.LinuxUtilities, version=(2, 0, 0)
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),
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requirements.PluginRequirement(
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name="lsmod", plugin=lsmod.Lsmod, version=(2, 0, 0)
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),
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]
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def _generator(self):
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vmlinux = self.context.modules[self.config["kernel"]]
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modules = lsmod.Lsmod.list_modules(self.context, vmlinux.name)
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handlers = linux.LinuxUtilities.generate_kernel_handler_info(
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self.context, vmlinux.name, modules
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)
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is_32bit = not symbols.symbol_table_is_64bit(
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self.context, vmlinux.symbol_table_name
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)
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idt_table_size = 256
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address_mask = self.context.layers[vmlinux.layer_name].address_mask
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# hw handlers + system call
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check_idxs = list(range(20)) + [128]
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if is_32bit:
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if vmlinux.has_type("gate_struct"):
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idt_type = "gate_struct"
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else:
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idt_type = "desc_struct"
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else:
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if vmlinux.has_type("gate_struct64"):
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idt_type = "gate_struct64"
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elif vmlinux.has_type("gate_struct"):
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idt_type = "gate_struct"
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else:
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idt_type = "idt_desc"
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addrs = vmlinux.object_from_symbol("idt_table")
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table = vmlinux.object(
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object_type="array",
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offset=addrs.vol.offset,
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subtype=vmlinux.get_type(idt_type),
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count=idt_table_size,
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absolute=True,
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)
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for i in check_idxs:
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ent = table[i]
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if not ent:
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continue
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if hasattr(ent, "Address"):
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idt_addr = ent.Address
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else:
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low = ent.offset_low
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middle = ent.offset_middle
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if hasattr(ent, "offset_high"):
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high = ent.offset_high
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else:
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high = 0
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idt_addr = (high << 32) | (middle << 16) | low
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idt_addr = idt_addr & address_mask
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module_name, symbol_name = (
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linux_utilities_modules.Modules.lookup_module_address(
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self.context, vmlinux.name, handlers, idt_addr
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)
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)
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yield (
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0,
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[
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format_hints.Hex(i),
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format_hints.Hex(idt_addr),
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module_name,
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symbol_name,
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],
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)
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def run(self):
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return renderers.TreeGrid(
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[
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("Index", format_hints.Hex),
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("Address", format_hints.Hex),
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("Module", str),
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("Symbol", str),
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],
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self._generator(),
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)
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