mirror of
https://github.com/volatilityfoundation/volatility
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iMHLv2
98 lines
3.5 KiB
Python
98 lines
3.5 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_syscall_arm(linux_common.AbstractLinuxARMCommand):
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""" Checks if the system call table has been altered """
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def _get_syscall_table_size(self):
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""" Get size of syscall table from the vector_swi function """
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vector_swi_addr = self.addr_space.profile.get_symbol("vector_swi")
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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 & 0xffff0000) == 0xe3570000):
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shift = 0x10 - ((opcode & 0xff00) >> 8)
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size = (opcode & 0xff) << (2 * shift)
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return size
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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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debug.error("Syscall table size could not be determined.")
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def _get_syscall_table_address(self):
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""" returns the address of the syscall table """
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syscall_table_address = self.addr_space.profile.get_symbol("sys_call_table")
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if syscall_table_address:
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return syscall_table_address
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#TODO: Handle event where this isn't exported (if needed)
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debug.error("Symbol sys_call_table not export. Please file a bug report.")
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def calculate(self):
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"""
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This works by walking the system call table
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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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num_syscalls = self._get_syscall_table_size()
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syscall_addr = self._get_syscall_table_address()
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sym_addrs = self.profile.get_all_addresses()
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table = obj.Object("Array", offset = syscall_addr, vm = self.addr_space, targetType = "unsigned int", count = num_syscalls)
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for (i, call_addr) in enumerate(table):
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if not call_addr:
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continue
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# have to treat them as 'long' so need to mask
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call_addr = call_addr & 0xffffffff
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if not call_addr in sym_addrs:
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yield(i, call_addr, 1)
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else:
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yield(i, call_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, call_addr, hooked) in data:
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if hooked == 0:
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sym_name = self.profile.get_symbol_by_address("kernel", call_addr)
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else:
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sym_name = "HOOKED"
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self.table_row(outfd, i, call_addr, sym_name)
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