mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
Andrew C
128 lines
4.3 KiB
Python
128 lines
4.3 KiB
Python
# Volatility
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# Copyright (C) 2007-2013 Volatility Foundation
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#
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# This file is part of Volatility.
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#
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# Volatility is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Volatility is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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@author: Andrew Case
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@license: GNU General Public License 2.0
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@contact: atcuno@gmail.com
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@organization:
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"""
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import volatility.debug as debug
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import volatility.obj as obj
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import volatility.plugins.linux.common as linux_common
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from volatility.renderers import TreeGrid
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from volatility.renderers.basic import Address
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idt_vtype_64 = {
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'idt_desc': [ 16 , {
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'offset_low' : [0, ['unsigned short']],
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'segment' : [2, ['unsigned short']],
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'ist' : [4, ['unsigned short']],
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'offset_middle' : [6, ['unsigned short']],
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'offset_high' : [8, ['unsigned int']],
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'unused' : [12, ['unsigned int']],
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}],
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}
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class LinuxIDTTypes(obj.ProfileModification):
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conditions = {"os" : lambda x : x in ["linux"]}
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def modification(self, profile):
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if profile.metadata.get('memory_model', '64bit') == "64bit":
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profile.vtypes.update(idt_vtype_64)
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class linux_check_idt(linux_common.AbstractLinuxCommand):
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""" Checks if the IDT has been altered """
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def calculate(self):
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"""
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This works by walking the IDT table for the entries that Linux uses
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and verifies that each is a symbol in the kernel
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"""
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linux_common.set_plugin_members(self)
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if self.profile.metadata['arch'] not in ["x64", "x86"]:
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debug.error("This plugin is only supported on Intel-based memory captures")
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tblsz = 256
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sym_addrs = self.profile.get_all_addresses()
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# hw handlers + system call
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check_idxs = list(range(0, 20)) + [128]
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if self.profile.metadata.get('memory_model', '32bit') == "32bit":
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idt_type = "desc_struct"
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else:
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if self.profile.has_type("gate_struct64"):
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idt_type = "gate_struct64"
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else:
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idt_type = "idt_desc"
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# this is written as a list b/c there are supposdly kernels with per-CPU IDTs
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# but I haven't found one yet...
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addrs = [self.addr_space.profile.get_symbol("idt_table")]
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for tableaddr in addrs:
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table = obj.Object(theType = 'Array', offset = tableaddr, vm = self.addr_space, targetType = idt_type, count = tblsz)
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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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high = ent.offset_high
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idt_addr = (high << 32) | (middle << 16) | low
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if idt_addr != 0:
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if not idt_addr in sym_addrs:
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hooked = 1
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sym_name = "HOOKED"
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else:
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hooked = 0
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sym_name = self.profile.get_symbol_by_address("kernel", idt_addr)
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yield(i, ent, idt_addr, sym_name, hooked)
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def unified_output(self, data):
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return TreeGrid([("Index", Address),
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("Address", Address),
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("Symbol", str)],
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self.generator(data))
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def generator(self, data):
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for (i, _, idt_addr, sym_name, hooked) in data:
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yield (0, [Address(i), Address(idt_addr), str(sym_name)])
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def render_text(self, outfd, data):
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self.table_header(outfd, [("Index", "[addr]"), ("Address", "[addrpad]"), ("Symbol", "<30")])
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for (i, _, idt_addr, sym_name, hooked) in data:
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self.table_row(outfd, i, idt_addr, sym_name)
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