/usr/lib/python2.7/dist-packages/rekall/plugins/addrspaces/crash.py is in python-rekall-core 1.6.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | # Rekall Memory Forensics
# Copyright (C) 2012
# Copyright 2013 Google Inc. All Rights Reserved.
#
# Authors:
# Michael Cohen <scudette@gmail.com> based on code by
# {npetroni,awalters}@4tphi.net (Nick Petroni and AAron Walters)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""An Address Space for processing crash dump files."""
from rekall import addrspace
from rekall.plugins.overlays.windows import crashdump
# pylint: disable=protected-access
class WindowsCrashDumpSpace32(addrspace.RunBasedAddressSpace):
""" This Address Space supports windows Crash Dump format """
order = 30
PAGE_SIZE = 0x1000
# Participate in Address Space voting.
__image = True
def __init__(self, **kwargs):
super(WindowsCrashDumpSpace32, self).__init__(**kwargs)
self.as_assert(self.base != None, "No base address space provided")
self.offset = 0
self.fname = ''
# Check the file for sanity.
self.check_file()
file_offset = self.header.obj_size
for run in self.header.PhysicalMemoryBlockBuffer.Run:
self.add_run(int(run.BasePage) * self.PAGE_SIZE,
file_offset,
int(run.PageCount) * self.PAGE_SIZE)
file_offset += run.PageCount * self.PAGE_SIZE
self.session.SetCache(
"dtb", int(self.header.DirectoryTableBase))
def check_file(self):
"""Checks the base file handle for sanity."""
self.as_assert(self.base,
"Must stack on another address space")
# Must start with the magic PAGEDUMP
self.as_assert((self.base.read(0, 8) == 'PAGEDUMP'),
"Header signature invalid")
self.profile = crashdump.CrashDump32Profile(
session=self.session)
self.header = self.profile.Object(
"_DMP_HEADER", offset=self.offset, vm=self.base)
if self.header.DumpType != "Full Dump":
# Here we rely on the WindowsCrashBMP AS to run before us. Therefore
# we fail hard if this is not a valid legacy crash format.
raise IOError("This is not a full memory crash dump. "
"Kernel crash dumps are not supported.")
class WindowsCrashDumpSpace64(WindowsCrashDumpSpace32):
"""This AS supports windows Crash Dump format."""
order = 30
# Participate in Address Space voting.
__image = True
def check_file(self):
"""Check specifically for 64 bit crash dumps."""
# Must start with the magic PAGEDU64
self.as_assert((self.base.read(0, 8) == 'PAGEDU64'),
"Header signature invalid")
self.profile = crashdump.CrashDump64Profile(
session=self.session)
self.as_assert(self.profile.has_type("_DMP_HEADER64"),
"_DMP_HEADER64 not available in profile")
self.header = self.profile.Object("_DMP_HEADER64",
offset=self.offset, vm=self.base)
# The following error is fatal - abort the voting mechanism.
# Unfortunately Volatility does not set this field correctly, so we do
# not make it a fatal error. It can lead to problems if we try to parse
# other crash dump formats, (Especially Win8 ones - see below) so we
# might consider making this a fatal error in future.
if self.header.DumpType != "Full Dump":
self.session.logging.warning(
"This is not a full memory crash dump. Kernel crash dumps are "
"not supported.")
# Catch this error early or we will hog all memory trying to parse a
# huge number of Runs. On Windows 8 we have observed the DumpType to be
# == 5 and these fields are padded with "PAGE" (i.e. 0x45474150).
if self.header.PhysicalMemoryBlockBuffer.NumberOfRuns > 100:
raise RuntimeError(
"This crashdump file format is not supported. Rekall does not "
"currently support crashdumps using the Win8 format.")
class WindowsCrashBMP(addrspace.RunBasedAddressSpace):
"""This Address Space supports the new windows Crash Dump format.
This format first appeared in Windows 8 x64 versions. We reversed this
format by examining the Crash dump file from a Windows 8 system.
Alternative implementations:
Volatility 2.4: crashbmp.py (not working at time of writing.).
"""
# Must try this before the old Crashdump format.
order = 25
PAGE_SIZE = 0x1000
# Participate in Address Space voting.
__image = True
def __init__(self, **kwargs):
super(WindowsCrashBMP, self).__init__(**kwargs)
self.as_assert(self.base, "Must stack on another address space")
# Must start with the magic PAGEDU64
self.as_assert((self.base.read(0, 8) == 'PAGEDU64'),
"Header signature invalid")
self.profile = crashdump.CrashDump64Profile(
session=self.session)
self.header = self.profile.Object("_DMP_HEADER64", vm=self.base)
self.as_assert(
self.header.DumpType == "BMP Dump", "Only BMP dumps supported.")
self.bmp_header = self.header.BMPHeader
PAGE_SIZE = 0x1000
# First run [Physical Offset, File Offset, Run length]
first_page = self.bmp_header.FirstPage.v()
last_run = [0, first_page, 0]
for pfn, present in enumerate(self._generate_bitmap()):
if present:
if pfn * PAGE_SIZE == last_run[0] + last_run[2]:
last_run[2] += PAGE_SIZE
else:
# Dump the last run only if it has non zero length.
if last_run[2] > 0:
self.add_run(*last_run)
# The next run starts here.
last_run = [
pfn * PAGE_SIZE, last_run[1] + last_run[2], PAGE_SIZE]
# Flush the last run if needed.
if last_run[2] > 0:
self.add_run(*last_run)
# Set the DTB from the crash dump header.
self.session.SetCache("dtb", self.header.DirectoryTableBase.v(),
volatile=False)
def _generate_bitmap(self):
"""Generate Present/Not Present for each page in the dump."""
# The bitmap is an array of 32 bit integers. Each bit in each int
# represents a single memory page.
for value in self.bmp_header.Bitmap:
# This is kind of lame but in python it is way faster than bit
# manipulations.
for bit in reversed("{0:032b}".format((value.v()))):
yield bit == "1"
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