mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
Andrew Case
129 lines
4.7 KiB
Python
129 lines
4.7 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 Version 2 as
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# published by the Free Software Foundation. You may not use, modify or
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# distribute this program under any other version of the GNU General
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# Public License.
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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 re
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import volatility.obj as obj
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import volatility.debug as debug
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import volatility.plugins.linux.common as linux_common
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import volatility.plugins.linux.lsmod as linux_lsmod
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from volatility.renderers import TreeGrid
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from volatility.renderers.basic import Address
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class linux_hidden_modules(linux_common.AbstractLinuxCommand):
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"""Carves memory to find hidden kernel modules"""
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def walk_modules_address_space(self, addr_space):
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list_mods = [x[0].obj_offset for x in linux_lsmod.linux_lsmod(self._config).calculate()]
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if addr_space.profile.get_symbol("module_addr_min"):
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min_addr_sym = obj.Object("unsigned long", offset = addr_space.profile.get_symbol("module_addr_min"), vm = addr_space)
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max_addr_sym = obj.Object("unsigned long", offset = addr_space.profile.get_symbol("module_addr_max"), vm = addr_space)
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elif addr_space.profile.get_symbol("mod_tree"):
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skip_size = addr_space.profile.get_obj_size("latch_tree_root")
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addr = addr_space.profile.get_symbol("mod_tree")
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ulong_size = addr_space.profile.get_obj_size("unsigned long")
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min_addr_sym = obj.Object("unsigned long", offset = addr + skip_size, vm = addr_space)
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max_addr_sym = obj.Object("unsigned long", offset = addr + skip_size + ulong_size, vm = addr_space)
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else:
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debug.error("Unsupport kernel verison. Please file a bug ticket that includes your kernel version and distribution.")
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min_addr = min_addr_sym & ~0xfff
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max_addr = (max_addr_sym & ~0xfff) + 0x1000
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scan_buf = ""
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llen = max_addr - min_addr
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allfs = "\xff" * 4096
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memory_model = self.addr_space.profile.metadata.get('memory_model', '32bit')
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if memory_model == '32bit':
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minus_size = 4
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else:
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minus_size = 8
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check_bufs = []
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replace_bufs = []
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check_nums = [3000, 2800, 2700, 2500, 2300, 2100, 2000, 1500, 1300, 1200, 1024, 512, 256, 128, 96, 64, 48, 32, 24]
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for num in check_nums:
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check_bufs.append("\x00" * num)
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replace_bufs.append(("\xff" * (num-minus_size)) + "\x00" * minus_size)
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for page in range(min_addr, max_addr, 4096):
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to_append = allfs
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tmp = addr_space.read(page, 4096)
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if tmp:
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non_zero = False
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for t in tmp:
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if t != "\x00":
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non_zero = True
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break
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if non_zero:
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for i in range(len(check_nums)):
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tmp = tmp.replace(check_bufs[i], replace_bufs[i])
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to_append = tmp
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scan_buf = scan_buf + to_append
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for cur_addr in re.finditer("(?=(\x00\x00\x00\x00|\x01\x00\x00\x00|\x02\x00\x00\x00))", scan_buf):
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mod_addr = min_addr + cur_addr.start()
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if mod_addr in list_mods:
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continue
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m = obj.Object("module", offset = mod_addr, vm = addr_space)
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if m.is_valid():
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yield m
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def calculate(self):
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linux_common.set_plugin_members(self)
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for mod in self.walk_modules_address_space(self.addr_space):
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yield mod
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def unified_output(self, data):
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return TreeGrid([("Offset(V)", Address),
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("Name", str)],
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self.generator(data))
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def generator(self, data):
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for module in data:
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yield (0, [Address(module.obj_offset), str(module.name)])
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def render_text(self, outfd, data):
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self.table_header(outfd, [("Offset (V)", "[addrpad]"), ("Name", "")])
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for module in data:
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self.table_row(outfd, module.obj_offset, str(module.name))
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