mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
mike.auty@gmail.com
87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
# Volatility
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#
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# This program 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 (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# 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 this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""
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@author: Andrew Case
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@license: GNU General Public License 2.0 or later
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@contact: atcuno@gmail.com
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@organization:
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"""
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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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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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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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idt_type = "gate_struct64"
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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.get_profile_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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idt_addr = ent.Address
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if not idt_addr in sym_addrs:
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yield(i, idt_addr, 1)
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else:
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yield(i, idt_addr, 0)
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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, hooked) in data:
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if hooked == 0:
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sym_name = self.profile.get_symbol_by_address("kernel", idt_addr)
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else:
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sym_name = "HOOKED"
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self.table_row(outfd, i, idt_addr, sym_name)
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