mirror of
https://github.com/volatilityfoundation/volatility
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iMHLv2
82 lines
3.2 KiB
Python
82 lines
3.2 KiB
Python
# Volatility
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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: Joe Sylve
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@license: GNU General Public License 2.0
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@contact: joe.sylve@gmail.com
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@organization: 504ENSICS Labs
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"""
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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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class linux_check_evt_arm(linux_common.AbstractLinuxARMCommand):
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''' Checks the Exception Vector Table to look for syscall table hooking '''
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VECTOR_BASE = 0xffff0000
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SWI_BASE = VECTOR_BASE + 8
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def calculate(self):
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linux_common.set_plugin_members(self)
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# Get instructions executed when an inturrupt exception occurs
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swi = obj.Object("unsigned int", offset = self.SWI_BASE, vm = self.addr_space)
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# Get offset of address to vector_swi
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offset = (swi & 0x0fff) + 8
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# Verify that instruction hasn't been modified (should be: ldr pc, [pc, #???] (e59ff???))
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if (swi & 0xfffff000) == 0xe59ff000:
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yield ("SWI Offset Instruction", "PASS", "Offset: {0}".format(offset))
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else:
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yield ("SWI Offset Instruction", "FAIL", "{0:X}".format(swi))
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return
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# Get vector_swi_addr from table
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vector_swi_addr = obj.Object("unsigned int", offset = self.SWI_BASE + (offset), vm = self.addr_space)
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# Check to see if vector_swi handler has been hooked
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if vector_swi_addr == self.addr_space.profile.get_symbol("vector_swi"):
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yield ("vector_swi address", "PASS", "0x{0:X}".format(vector_swi_addr))
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else:
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yield ("vector_swi address", "FAIL", "0x{0:X}".format(vector_swi_addr))
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return
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# Check for hooking of sys_call table pointer
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sc_opcode = None;
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max_opcodes_to_check = 1024
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while (max_opcodes_to_check):
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opcode = obj.Object("unsigned int", offset= vector_swi_addr, vm = self.addr_space)
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if ((opcode & 0xffffff00) == 0xe28f8000):
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sc_opcode = opcode
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break
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vector_swi_addr += 4
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max_opcodes_to_check -= 1
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if sc_opcode:
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yield ("vector_swi code modification", "PASS", "{0:X}".format(sc_opcode))
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else:
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yield ("vector_swi code modification", "FAIL", "Opcode E28F80?? not found")
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return
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def render_text(self, outfd, data):
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self.table_header(outfd, [("Check", "<30"), ("PASS/FAIL", "<5"), ("Info", "<30")])
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for (check, result, info) in data:
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self.table_row(outfd, check, result, info)
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