/usr/lib/python2.7/dist-packages/rekall/plugins/overlays/linux/linux.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.
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# Copyright (C) 2010 Brendan Dolan-Gavitt
# Copyright (c) 2011 Michael Cohen <scudette@gmail.com>
# Copyright 2013 Google Inc. All Rights Reserved.
#
# 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
#
"""
@author: Brendan Dolan-Gavitt
@license: GNU General Public License 2.0 or later
@contact: brendandg@gatech.edu
@organization: Georgia Institute of Technology
"""
# pylint: disable=protected-access
from rekall import obj
from rekall import utils
from rekall.plugins.overlays import basic
from rekall.plugins.overlays.linux import vfs
linux_overlay = {
'task_struct' : [None, {
'state': [None, ['Flags', dict(
maskmap=utils.MaskMapFromDefines("""
# From http://lxr.free-electrons.com/source/include/linux/sched.h#L207
#define TASK_RUNNING 0
#define TASK_INTERRUPTIBLE 1
#define TASK_UNINTERRUPTIBLE 2
#define TASK_STOPPED 4
#define TASK_TRACED 8
#define TASK_DEAD 64
#define TASK_WAKEKILL 128
#define TASK_WAKING 256
#define TASK_PARKED 512
#define TASK_STATE_MAX 1024
"""))]],
'exit_state': [None, ['Flags', dict(
maskmap=utils.MaskMapFromDefines("""
# From http://lxr.free-electrons.com/source/include/linux/sched.h#L207
/* in tsk->exit_state */
#define EXIT_ZOMBIE 16
#define EXIT_DEAD 32
/* in tsk->state again */
"""))]],
# Common pseudo fields to provide cross OS compatibility.
'name': lambda x: x.comm,
'dtb': lambda x: x.obj_vm.vtop(x.mm.pgd.v()),
'comm': [None, ['UnicodeString', dict(length=16)]],
'uid': lambda x: x.m("uid") or x.cred.uid,
'gid': lambda x: x.m("gid") or x.cred.gid,
'euid': lambda x: x.m("euid") or x.cred.euid,
}],
'module' : [None, {
'name': lambda x: utils.SmartUnicode(
x.m("name").cast('UnicodeString', length=60)),
'base': lambda x: x.module_core.v(),
'size': lambda x: x.core_size,
'end': lambda x: x.base + x.core_size,
'kp': [None, ['Pointer', dict(
target='Array',
target_args=dict(
target='kernel_param',
count=lambda x: x.num_kp))]],
}],
'kernel_param': [None, {
'name' : [None, ['Pointer', dict(target='UnicodeString')]],
'getter_addr': lambda x: x.multi_m("get", "ops.get"),
}],
'kparam_array': [None, {
'getter_addr': lambda x: x.multi_m("get", "ops.get"),
}],
'super_block' : [None, {
's_id' : [None, ['UnicodeString', dict(length=32)]],
'major': lambda x: x.s_dev >> 20,
'minor': lambda x: x.s_dev & ((1 << 20) - 1),
}],
'net_device' : [None, {
'flags': [None, ['Flags', dict(
maskmap=utils.MaskMapFromDefines("""
http://lxr.free-electrons.com/source/include/linux/if.h?v=2.6.32#L31
/* Standard interface flags (netdevice->flags). */
30 #define IFF_UP 0x1 /* interface is up */
31 #define IFF_BROADCAST 0x2 /* broadcast address valid */
32 #define IFF_DEBUG 0x4 /* turn on debugging */
33 #define IFF_LOOPBACK 0x8 /* is a loopback net */
34 #define IFF_POINTOPOINT 0x10 /* interface is has p-p link */
35 #define IFF_NOTRAILERS 0x20 /* avoid use of trailers */
36 #define IFF_RUNNING 0x40 /* interface RFC2863 OPER_UP */
37 #define IFF_NOARP 0x80 /* no ARP protocol */
38 #define IFF_PROMISC 0x100 /* receive all packets */
39 #define IFF_ALLMULTI 0x200 /* receive all multicast packets*/
40
41 #define IFF_MASTER 0x400 /* master of a load balancer */
42 #define IFF_SLAVE 0x800 /* slave of a load balancer */
43
44 #define IFF_MULTICAST 0x1000 /* Supports multicast */
45
46 #define IFF_PORTSEL 0x2000 /* can set media type */
47 #define IFF_AUTOMEDIA 0x4000 /* auto media select active */
48 #define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses*/
49
50 #define IFF_LOWER_UP 0x10000 /* driver signals L1 up */
51 #define IFF_DORMANT 0x20000 /* driver signals dormant */
52
53 #define IFF_ECHO 0x40000 /* echo sent packets */
"""))]],
'name' : [None, ['UnicodeString', dict(length=16)]],
'ip_ptr': [None, ['Pointer', dict(target="in_device")]],
}],
'in_ifaddr': [None, {
'ifa_address': [None, ['Ipv4Address']],
'ifa_label': [None, ['String']],
}],
'sockaddr_un' : [None, {
'sun_path' : [None, ['UnicodeString', dict(length=108)]],
}],
'cpuinfo_x86' : [None, {
'x86_model_id' : [None, ['UnicodeString', dict(length=64)]],
'x86_vendor_id' : [None, ['UnicodeString', dict(length=16)]],
}],
'module_sect_attr': [None, {
'name': [None, ['Pointer', dict(target='UnicodeString')]]
}],
# The size of the log record is stored in the len member.
'log': [lambda x: x.m("len"), {
# The log message starts after the level member.
'message': [lambda x: x.flags.obj_offset + x.flags.obj_size,
['UnicodeString', dict(
# The length of the message is the text and an optional
# dict.
length=lambda x: x.text_len + x.dict_len)]],
'level': [None, ['Enumeration', {
'choices': {
0: 'LOG_EMERG',
1: 'LOG_ALERT',
2: 'LOG_CRIT',
3: 'LOG_ERR',
4: 'LOG_WARNING',
5: 'LOG_NOTICE',
6: 'LOG_INFO',
7: 'LOG_DEBUG'
},
'target': 'BitField',
'target_args': dict(
start_bit=0, end_bit=3),
}]],
}],
"file": [None, {
"dentry": lambda x: x.multi_m("f_dentry", "f_path.dentry"),
"vfsmnt": lambda x: x.multi_m("f_vfsmnt", "f_path.mnt"),
}],
'vm_area_struct' : [None, {
'vm_flags' : [None, ['PermissionFlags', dict(
bitmap={
'r': 0,
'w': 1,
'x': 2
}
)]],
}],
'dentry': [None, {
'd_flags': [None, ['Flags', dict(
maskmap={
# /* autofs: "under construction" */
"DCACHE_AUTOFS_PENDING": 0x0001,
# /* this dentry has been "silly renamed" and
# has to be deleted on the last dput() */
"DCACHE_NFSFS_RENAMED": 0x0002,
"DCACHE_DISCONNECTED": 0x0004,
# /* Recently used, don't discard. */
"DCACHE_REFERENCED": 0x0008,
"DCACHE_UNHASHED": 0x0010,
# /* Parent inode is watched by inotify */
"DCACHE_INOTIFY_PARENT_WATCHED": 0x0020,
# /* Parent inode is watched by some fsnotify
# listener */
"DCACHE_FSNOTIFY_PARENT_WATCHED": 0x0080,
},
target="unsigned int",
)]],
'is_root': lambda x: x == x.d_parent,
}],
'd_name': [None, {
'd_name': [None, ['Pointer', dict(
target="String")]],
}],
'qstr': [None, {
'len': lambda x: (x.m("len") or
x.m("u1.u1.len") or
# Worst case scenario, when dwarf parsing epicfailed.
(x.m("u1.hash_len") & 0xFFFFFFFF00000000) >> 32),
'name': [None, ['Pointer', dict(
target='UnicodeString',
target_args=dict(
# include/linux/limits.h
length=lambda x: (min(x.len, 255)),
)
)]],
}],
"files_struct": [None, {
# Version independent pointer to the fd table.
'_fd': lambda x: x.m("fdt").fd or x.fd,
# The fds table is an array of pointers to file structs. The index
# into the array is known in user space as a file descriptor. If the
# pointer in the array is invalid, the file descriptor is closed.
'fds': lambda x: x._fd.dereference_as(
"Array",
target_args=dict(
target="Pointer",
target_args=dict(
target="file"
),
count=lambda x: x.m("fdt").max_fds or x.max_fds,
)
)
}],
"kobject": [None, {
'name': [None, ["Pointer", dict(
target="String",
target_args=dict(length=32),
)]],
}],
'gate_struct64': [None, {
'address': lambda x: obj.Pointer.integer_to_address(
x.offset_low |
x.offset_middle << 16 |
x.offset_high << 32),
'gate_type': [5, ['Enumeration', {
'choices': {
5: '32-bit Task Gate',
6: '16-bit Int Gate',
7: '16-bit Trap Gate',
14: '32-bit Int Gate',
15: '32-bit Trap Gate',
},
'target': 'BitField',
'target_args': dict(
start_bit=0, end_bit=4),
}]],
'present': lambda x: x.m("p"),
}],
'desc_struct': [None, {
'address': lambda x: ((x.u1.u1.b & 0xffff0000) |
(x.u1.u1.a & 0x0000ffff)),
'gate_type': [5, ['Enumeration', {
'choices': {
5: '32-bit Task Gate',
6: '16-bit Int Gate',
7: '16-bit Trap Gate',
14: '32-bit Int Gate',
15: '32-bit Trap Gate',
},
'target': 'BitField',
'target_args': dict(
start_bit=0, end_bit=4),
}]],
'dpl': lambda x: x.m("u1.u2.dpl"),
'present': lambda x: x.m("u1.u2.p"),
}],
'tty_driver': [None, {
"name": [None, ["Pointer", dict(
target="String"
)]],
"ttys": [None, ["Pointer", dict(
target="Array",
target_args=dict(
count=lambda x: x.num,
target="Pointer",
target_args=dict(
target="tty_struct"
)
)
)]],
}],
'tty_struct': [None, {
'name': [None, ["String"]],
}],
"resource": [None, {
"name": [None, ["Pointer", dict(
target="String"
)]],
}],
"sock": [None, {
# http://lxr.free-electrons.com/source/include/linux/net.h#L58
"sk_type": [None, ["Enumeration", dict(
choices={
1:"SOCK_STREAM",
2:"SOCK_DGRAM",
3:"SOCK_RAW",
4:"SOCK_RDM",
5:"SOCK_SEQPACKET",
6:"SOCK_DCCP",
10:"SOCK_PACKET",
},
target="BitField",
target_args=dict(
start_bit=16, end_bit=32))]],
"sk_protocol": [None, ["Enumeration", dict(
# http://lxr.free-electrons.com/source/include/uapi/linux/in.h?#L26
choices={
0:"IPPROTO_HOPOPT", # Dummy protocol forTCP
# Internet Control Message Protocol
1:"IPPROTO_ICMP",
# Internet Group Management Protocol
2:"IPPROTO_IGMP",
# IPIP tunnels (older KA9Q tunnels use 94)
4:"IPPROTO_IPV4",
6:"IPPROTO_TCP", # Transmission Control Protocol
8:"IPPROTO_EGP", # Exterior Gateway Protocol
12:"IPPROTO_PUP", # PUP protocol
17:"IPPROTO_UDP", # User Datagram Protocol
22:"IPPROTO_IDP", # XNS IDP protocol
29:"IPPROTO_TP", # SO Transport Protocol Class 4
# Datagram Congestion Control Protocol
33:"IPPROTO_DCCP",
41:"IPPROTO_IPV6", # IPv6-in-IPv4 tunnelling
46:"IPPROTO_RSVP", # RSVP Protocol
# Cisco GRE tunnels (rfc 1701",1702)
47:"IPPROTO_GRE",
# Encapsulation Security Payload protocol
50:"IPPROTO_ESP",
51:"IPPROTO_AH", # Authentication Header protocol
# Multicast Transport Protocol
92:"IPPROTO_MTP",
# IP option pseudo header for BEET
94:"IPPROTO_BEETPH",
98:"IPPROTO_ENCAP", # Encapsulation Header
103:"IPPROTO_PIM", # Protocol Independent Multicast
108:"IPPROTO_COMP", # Compression Header Protocol
# Stream Control Transport Protocol
132:"IPPROTO_SCTP",
136:"IPPROTO_UDPLITE", # UDP-Lite (RFC 3828)
255:"IPPROTO_RAW", # Raw IP packets
},
target="BitField",
target_args=dict(
start_bit=8, end_bit=16),
)]],
}],
"sock_common": [None, {
"skc_state": [None, ["Enumeration", dict(
# http://lxr.free-electrons.com/source/include/net/tcp_states.h#L16
# Because these states are not only used by AF_INET*
# with TCP proto, we removed the TCP_ prefix to make
# them more readable.
choices={
1:"ESTABLISHED",
2:"SYN_SENT",
3:"SYN_RECV",
4:"FIN_WAIT1",
5:"FIN_WAIT2",
6:"TIME_WAIT",
7:"CLOSE",
8:"CLOSE_WAIT",
9:"LAST_ACK",
10:"LISTEN",
11:"CLOSING",
},
target="unsigned char",
)]],
"skc_family": [None, ["Enumeration", dict(
choices=utils.EnumerationFromDefines("""
http://lxr.free-electrons.com/source/include/linux/socket.h#L140
/* Supported address families. */
141 #define AF_UNSPEC 0
142 #define AF_UNIX 1 /* Unix domain sockets */
143 #define AF_LOCAL 1 /* POSIX name for AF_UNIX */
144 #define AF_INET 2 /* Internet IP Protocol */
145 #define AF_AX25 3 /* Amateur Radio AX.25 */
146 #define AF_IPX 4 /* Novell IPX */
147 #define AF_APPLETALK 5 /* AppleTalk DDP */
148 #define AF_NETROM 6 /* Amateur Radio NET/ROM */
149 #define AF_BRIDGE 7 /* Multiprotocol bridge */
150 #define AF_ATMPVC 8 /* ATM PVCs */
151 #define AF_X25 9 /* Reserved for X.25 project */
152 #define AF_INET6 10 /* IP version 6 */
153 #define AF_ROSE 11 /* Amateur Radio X.25 PLP */
154 #define AF_DECnet 12 /* Reserved for DECnet project */
155 #define AF_NETBEUI 13 /* Reserved for 802.2LLC project*/
156 #define AF_SECURITY 14 /* Security callback pseudo AF */
157 #define AF_KEY 15 /* PF_KEY key management API */
158 #define AF_NETLINK 16
160 #define AF_PACKET 17 /* Packet family */
161 #define AF_ASH 18 /* Ash */
162 #define AF_ECONET 19 /* Acorn Econet */
163 #define AF_ATMSVC 20 /* ATM SVCs */
164 #define AF_RDS 21 /* RDS sockets */
165 #define AF_SNA 22 /* Linux SNA Project (nutters!) */
166 #define AF_IRDA 23 /* IRDA sockets */
167 #define AF_PPPOX 24 /* PPPoX sockets */
168 #define AF_WANPIPE 25 /* Wanpipe API Sockets */
169 #define AF_LLC 26 /* Linux LLC */
170 #define AF_IB 27 /* Native InfiniBand address */
171 #define AF_CAN 29 /* Controller Area Network */
172 #define AF_TIPC 30 /* TIPC sockets */
173 #define AF_BLUETOOTH 31 /* Bluetooth sockets */
174 #define AF_IUCV 32 /* IUCV sockets */
175 #define AF_RXRPC 33 /* RxRPC sockets */
176 #define AF_ISDN 34 /* mISDN sockets */
177 #define AF_PHONET 35 /* Phonet sockets */
178 #define AF_IEEE802154 36 /* IEEE802154 sockets */
179 #define AF_CAIF 37 /* CAIF sockets */
180 #define AF_ALG 38 /* Algorithm sockets */
181 #define AF_NFC 39 /* NFC sockets */
182 #define AF_VSOCK 40 /* vSockets */
183 #define AF_MAX 41 /* For now.. */
"""),
target="short unsigned int"
)]],
}],
"mount": [None, {
"mnt_devname": [None, ["Pointer", dict(target="String")]],
"mnt_root": lambda x: x.m("mnt_root") or x.m("mnt.mnt_root"),
}],
"vfsmount": [None, {
"mnt_devname": [None, ["Pointer", dict(target="String")]],
"mnt_flags": [None, ["Flags", dict(
maskmap={
# include/linux/mount.h
"nosuid": 0x01,
"nodev": 0x02,
"noexec": 0x04,
"noatime": 0x08,
"nodiratime": 0x10,
"relatime": 0x20,
"ro": 0x40,
"shrinkable": 0x100,
"writehold": 0x200,
"shared": 0x1000,
"unbindable": 0x2000,
},
target="unsigned int",
)]],
"mnt": lambda x: x,
}],
"file_system_type": [None, {
"name": [None, ["Pointer", dict(target="String")]],
}],
"inode": [None, {
"i_mode": [None, ["InodePermission", dict(
target="unsigned int",
)]],
"type": lambda x: x.m("i_mode").cast(
"Enumeration", choices={
1: "S_IFIFO",
2: "S_IFCHR",
4: "S_IFDIR",
6: "S_IFBLK",
8: "S_IFREG",
10: "S_IFLNK",
12: "S_IFSOCK",
},
target="BitField",
target_args=dict(start_bit=12, end_bit=16),
),
"mode": lambda x: x.m("i_mode").cast(
"Flags",
maskmap=utils.MaskMapFromDefines("""
# From http://lxr.free-electrons.com/source/include/uapi/linux/stat.h
#define S_ISUID 0004000
#define S_ISGID 0002000
#define S_ISVTX 0001000
#define S_IRUSR 00400
#define S_IWUSR 00200
#define S_IXUSR 00100
#define S_IRGRP 00040
#define S_IWGRP 00020
#define S_IXGRP 00010
#define S_IROTH 00004
#define S_IWOTH 00002
#define S_IXOTH 00001
"""),
target="BitField",
target_args=dict(start_bit=0, end_bit=12),
),
}],
"radix_tree_node": [None, {
"rcu_head": lambda x: x.m("rcu_head") or x.m("u1.rcu_head"),
}],
"tk_core": [None, {
"seq": [0, ["seqcount"]],
"timekeeper": [8, ["timekeeper"]],
}],
"neigh_hash_table": [None, {
"hash_buckets": [None, ["Pointer", dict(
target="Array",
target_args=dict(
count=lambda x: 1 << x.hash_shift,
target="Pointer",
target_args=dict(
target="neighbour",
),
)
)]],
}],
}
class list_head(basic.ListMixIn, obj.Struct):
"""A list_head makes a doubly linked list."""
_forward = "next"
_backward = "prev"
class hlist_head(list_head):
def list_of_type(self, type, member):
return self.first.list_of_type(type, member)
class hlist_node(list_head):
_backward = "pprev"
def list_of_type(self, type, member):
head = self
node = head
if node:
yield basic.container_of(node, type, member)
while node and node != head:
yield basic.container_of(node, type, member)
node = node.next.deref()
def find_all_lists(self, seen):
stack = [self]
while stack:
item = stack.pop()
if item not in seen:
seen.append(item)
# In hlist, prev is a **
Blink = item.m(self._backward).deref()
if Blink.is_valid():
stack.append(Blink.dereference())
Flink = item.m(self._forward)
if Flink.is_valid():
stack.append(Flink.dereference())
def __empty__(self):
return self.m(self._forward) == self.m(self._backward).deref()
class inet_sock(obj.Struct):
"""Class for an internet socket object"""
@utils.safe_property
def src_port(self):
return (self.m("sport") or self.m("inet_sport")).cast(
"unsigned be short")
@utils.safe_property
def dst_port(self):
return ((self.m("dport") or self.m("inet_dport")).cast(
"unsigned be short") or self.sk.m("__sk_common.u3.u1.skc_dport") or
self.sk.m("__sk_common.u3.skc_dport"))
@utils.safe_property
def src_addr(self):
if self.sk.m("__sk_common").skc_family == "AF_INET":
return (self.m("rcv_saddr") or self.m("inet_rcv_saddr") or
self.sk.m("__sk_common.u1.u1.skc_rcv_saddr") or
self.m("inet_saddr")).cast(
"Ipv4Address")
else:
return self.m("pinet6.saddr").cast("Ipv6Address")
@utils.safe_property
def dst_addr(self):
if self.sk.m("__sk_common").skc_family == "AF_INET":
return (self.m("daddr") or self.m("inet_daddr") or
self.sk.m("__sk_common.u1.u1.skc_daddr") or
self.sk.m("__sk_common.skc_daddr")).cast(
"Ipv4Address")
else:
return (self.m("pinet6.daddr").cast("Ipv6Address") or
self.m("pinet6.daddr_cache").cast("Ipv6Address"))
class files_struct(obj.Struct):
def get_fds(self):
if hasattr(self, "fdt"):
fdt = self.fdt
ret = fdt.fd.dereference()
else:
ret = self.fd.dereference()
return ret
def get_max_fds(self):
if hasattr(self, "fdt"):
ret = self.fdt.max_fds
else:
ret = self.max_fds
return ret
class dentry(obj.Struct):
@utils.safe_property
def path(self):
dentry_ = self
path_components = []
# Check for deleted dentry_.
if self.d_flags.DCACHE_UNHASHED and not self.is_root:
return " (deleted) "
while len(path_components) < 50:
if dentry_.is_root:
break
component = utils.SmartUnicode(dentry_.d_name.name.deref())
path_components = [component] + path_components
dentry_ = dentry_.d_parent
result = '/'.join(filter(None, path_components))
if result.startswith(("socket:", "pipe:")):
if result.find("]") == -1:
result += ":[{0}]".format(self.d_inode.i_ino)
elif result != "inotify":
result = '/' + result
return result
class task_struct(obj.Struct):
@utils.safe_property
def commandline(self):
if self.mm:
# The argv string is initialized inside the process's address space.
proc_as = self.get_process_address_space()
# read argv from userland
argv = proc_as.read(self.mm.arg_start,
self.mm.arg_end - self.mm.arg_start)
if argv:
# split the \x00 buffer into args
name = " ".join(argv.split("\x00"))
else:
name = ""
else:
# kernel thread
name = "[" + self.comm + "]"
return name
@utils.safe_property
def task_start_time(self):
if self.obj_profile.get_constant("tk_core"):
# Kernel 3.17 changes how start_time is stored. Now it's
# in nsecs monotonic or boot based.
start_timespec = self.obj_profile.timespec()
start_timespec.tv_sec = self.m("start_time") / 1000000000
start_timespec.tv_nsec = self.m("start_time") % 1000000000
boot_time = self.obj_profile.getboottime()
start_time = self.obj_profile.UnixTimeStamp(
value = start_timespec.tv_sec - boot_time.tv_sec)
return start_time
return self.m("start_time").as_timestamp()
def get_path(self, filp):
"""Resolve the dentry, vfsmount relative to this task's chroot.
Returns:
An absolute path to the global filesystem mount. (I.e. we do not
truncate the path at the chroot point as the kernel does).
"""
# The specific implementation depends on the kernel version.
# Newer kernels have mnt_parent in the mount struct, not in the
# vfsmount struct.
if self.obj_profile.get_obj_offset("vfsmount", "mnt_parent"):
return vfs.Linux26VFS(self.obj_profile).get_path(self, filp)
else:
return vfs.Linux3VFS(self.obj_profile).get_path(self, filp)
def get_process_address_space(self):
directory_table_base = self.obj_vm.vtop(self.mm.pgd.v())
try:
process_as = self.obj_vm.__class__(
base=self.obj_vm.base, session=self.obj_vm.session,
dtb=directory_table_base, profile=self.obj_profile)
except AssertionError:
return obj.NoneObject("Unable to get process AS")
process_as.name = "Process {0}".format(self.pid)
return process_as
class timespec(obj.Struct):
# The following calculates the number of ns each tick is.
# http://lxr.free-electrons.com/source/include/linux/jiffies.h?v=2.6.32#L12
# The HZ value should be obtained from the auxilary vector but for now we
# hard code it. TODO: http://lwn.net/Articles/519085/
HZ = 1000
# The clock frequency of the i8253/i8254 PIT
CLOCK_TICK_RATE = PIT_TICK_RATE = 1193182
# LATCH is used in the interval timer and ftape setup.
LATCH = ((CLOCK_TICK_RATE + HZ/2) / HZ)
# HZ is the requested value. ACTHZ is actual HZ
ACTHZ = (CLOCK_TICK_RATE / LATCH)
# TICK_NSEC is the time between ticks in nsec assuming real ACTHZ
TICK_NSEC = 1000000 * 1000 / ACTHZ
NSEC_PER_SEC = 1000000000
def __init__(self, *args, **kwargs):
super(timespec, self).__init__(*args, **kwargs)
self.HZ = self.obj_profile.get_kernel_config("CONFIG_HZ") or self.HZ
def __add__(self, other):
if not isinstance(other, self.__class__):
raise TypeError("Can only add timespec to timespec")
sec = other.tv_sec + self.tv_sec
nsec = other.tv_nsec + self.tv_nsec
result = self.obj_profile.timespec()
result.tv_sec = sec
result.tv_nsec = nsec
return result
def __sub__(self, other):
ts = self.obj_profile.timespec()
ts.tv_sec = -other.tv_sec
ts.tv_nsec = -other.tv_nsec
return self + ts
def normalized_timespec(self):
"""Normalizes a timespec's secs and nsecs.
Based on set_normalized_timespec:
http://lxr.free-electrons.com/source/kernel/time.c?v=3.11#L358
"""
sec = self.tv_sec + self.tv_nsec / self.NSEC_PER_SEC
nsec = self.tv_nsec % self.NSEC_PER_SEC
result = self.obj_profile.timespec()
result.tv_sec = sec
result.tv_nsec = nsec
return result
def as_timestamp(self):
"""Returns the time as a UnixTimestamp."""
the_time = self - self.obj_profile.getboottime(vm=self.obj_vm)
the_time = the_time.normalized_timespec()
return self.obj_profile.UnixTimeStamp(value=the_time.tv_sec.v())
class net_device(obj.Struct):
@utils.safe_property
def mac_addr(self):
addr = self.perm_addr
if (addr.obj_vm.read(addr.obj_offset, addr.obj_size) ==
"\x00" * addr.obj_size):
addr = self.dev_addr.deref()
return addr.cast("MacAddress")
class PermissionFlags(basic.Flags):
"""A Flags object for printing vm_area_struct permissions
in a format like rwx or r-x"""
def __unicode__(self):
result = []
value = self.v()
for k, v in sorted(self.maskmap.items()):
if value & v:
result.append(k)
else:
result.append("-")
return ''.join(result)
def is_flag(self, flag):
return self.v() & (1 << self.bitmap[flag])
def is_executable(self):
return self.is_flag('x')
def is_readable(self):
return self.is_flag('r')
def is_writable(self):
return self.is_flag('w')
class kgid_t(obj.Struct):
"""Newer kernels use this struct instead of an int."""
def __unicode__(self):
return unicode(self.val)
def __long__(self):
return long(self.val)
class kuid_t(kgid_t):
"""Newer kernels use this struct instead of an int."""
class proc_dir_entry(obj.Struct):
@utils.safe_property
def Name(self):
if self.name.obj_type == "Pointer":
return self.name.deref().cast("String", length=self.namelen)
else:
return self.name.cast("String", length=self.namelen)
class page(obj.Struct):
def physical_offset(self):
"""The physical offset of the page represented by this page struct."""
# mem_map is used in 32-bit kernels.
mem_map = self.obj_profile.get_constant_object(
"mem_map", "Pointer")
if mem_map == None:
if self.obj_profile.get_constant("mem_section"):
# The VMEMMAP starts at this address in 64-bit kernels.
# arch/x86/include/asm/pgtable_64_types.h
mem_map = obj.Pointer.integer_to_address(0xffffea0000000000)
else:
self.obj_session.logging.error(
"Unable to determine physical address of page. NUMA is not "
"supported.")
return obj.NoneObject("NUMA is unsupported.")
# Linux stores an array of struct page starting at mem_map.
# To find the physical address of a given page, we need to find its
# index within the array which corresponds to the Page Frame Number
# and shift it left by the PAGE_SIZE.
pfn = (self.obj_offset - mem_map) / self.obj_size
phys_offset = pfn << 12
return phys_offset
def read(self, offset, size):
"""Reads data from the physical page associated to this page entry.
It reads PAGE_SIZE at max.
"""
phys_offset = self.physical_offset()
phys_as = self.obj_session.physical_address_space
to_read = max(0, self.obj_vm.PAGE_SIZE - offset)
to_read = min(size, to_read)
if to_read:
data = phys_as.read(phys_offset, to_read)
if to_read <= size:
data += "\x00" * (size - to_read)
return data
class InodePermission(basic.Flags):
def __getattr__(self, attr):
mask = super(InodePermission, self).__getattr__(attr)
if not mask:
return obj.NoneObject("Mask {0} not known".format(attr))
if attr.startswith("S_IF"):
return (self.v() & 0xF000) == mask
return self.v() & mask
class Linux(basic.RelativeOffsetMixin, basic.BasicClasses):
METADATA = dict(
os="linux",
type="Kernel")
image_base = 0
@classmethod
def Initialize(cls, profile):
super(Linux, cls).Initialize(profile)
profile.add_classes(dict(
InodePermission=InodePermission,
PermissionFlags=PermissionFlags,
dentry=dentry,
hlist_head=hlist_head,
hlist_node=hlist_node,
list_head=list_head,
net_device=net_device,
page=page, kgid_t=kgid_t, kuid_t=kuid_t,
proc_dir_entry=proc_dir_entry,
task_struct=task_struct,
timespec=timespec, inet_sock=inet_sock,
))
profile.add_overlay(linux_overlay)
profile.add_constants(dict(default_text_encoding="utf8"))
# Autoguessing for old profiles that don't provide an arch.
if not profile.metadata("arch"):
try:
profile.constant_addresses.find_gt(2**32)
profile.set_metadata("arch", "AMD64")
except ValueError:
profile.set_metadata("arch", "I386")
if profile.metadata("arch") == "I386":
basic.Profile32Bits.Initialize(profile)
try:
if (not profile.metadata("pae") and
profile.get_kernel_config("CONFIG_X86_PAE") == "y"):
profile.set_metadata("pae", True)
except ValueError:
pass
# ARM systems are just normal 32 bit systems with a weird MMU. Per
# http://elinux.org/images/6/6a/Elce11_marinas.pdf, there's also LPAE
# but we do not support this.
elif profile.metadata("arch") == "ARM":
basic.Profile32Bits.Initialize(profile)
elif profile.metadata("arch") == "MIPS":
basic.ProfileMIPS32Bits.Initialize(profile)
elif profile.metadata("arch") == "AMD64":
basic.ProfileLP64.Initialize(profile)
def GetImageBase(self):
if not self.image_base:
self.image_base = obj.Pointer.integer_to_address(
self.session.GetParameter("kernel_slide", 0))
return self.image_base
def _SetupProfileFromData(self, data):
"""Sets up the kernel profile, adding kernel config options."""
super(Linux, self)._SetupProfileFromData(data)
self.kernel_config_options = {}
# Add the kernel configuration
config = data.get("$CONFIG")
if config:
self.add_kernel_config_options(**config)
try:
# Set the pae flag if we're a 32bit PAE profile
if (self.get_kernel_config("CONFIG_X86_PAE") == "y" and
self.metadata("arch") == "I386"):
self.set_metadata("pae", True)
except ValueError:
# We cannot autoguess PAE at the moment if we don't know the config
# option value for it.
self.session.logging.debug(
"No kernel config available in the profile, so we cannot "
"detect PAE.")
def add_kernel_config_options(self, **kwargs):
"""Add the kwargs as kernel config options for this profile."""
for k, v in kwargs.iteritems():
self.kernel_config_options[k] = v
def get_kernel_config(self, config_option):
"""Returns the kernel config option config_option for this profile.
Raises if no kernel configuration is present in the profile.
"""
config_options = getattr(self, "kernel_config_options", obj.NoneObject(
"No kernel config options present in the profile."))
return config_options.get(config_option)
def get_wall_to_monotonic(self, vm=None):
wall_addr = self.get_constant("wall_to_monotonic")
if wall_addr:
return self.timespec(vm=vm, offset=wall_addr)
# After Kernel 3.3 wall_to_monotonic is stored inside the timekeeper.
timekeeper_addr = self.get_constant("timekeeper")
if timekeeper_addr:
return self.timekeeper(
vm=vm, offset=timekeeper_addr).wall_to_monotonic
def get_total_sleep_time(self, vm=None):
total_sleep_time_addr = self.get_constant(
"total_sleep_time")
if total_sleep_time_addr:
return self.timespec(
vm=vm, offset=total_sleep_time_addr)
# After Kernel 3.3 wall_to_monotonic is stored inside the timekeeper.
timekeeper_addr = self.get_constant("timekeeper")
if timekeeper_addr:
return self.timekeeper(
vm=vm, offset=timekeeper_addr).total_sleep_time
# Just return an empty timespec.
return self.timespec()
def getboottime(self, vm=None):
"""Returns the real time of system boot."""
if self.get_constant("tk_core"):
tk_core = self.get_constant_object("tk_core", "tk_core")
tk = tk_core.timekeeper
t = self.ktime_sub(tk.offs_real, tk.offs_boot)
return self.ktime_to_timespec(t)
else:
boottime = (self.get_wall_to_monotonic(vm=vm) +
self.get_total_sleep_time(vm=vm))
return boottime.normalized_timespec()
def ktime_sub(self, lhs, rhs):
"""Substracts two ktime_t instances."""
kt = self.ktime()
kt.tv64 = lhs.tv64 - rhs.tv64
return kt
def ktime_to_timespec(self, kt):
"""Transforms a ktime_t to a timespec."""
return self.ns_to_timespec(kt.tv64)
def ns_to_timespec(self, nsec):
"""Transforms nanoseconds to a timespec."""
ts = self.timespec()
if not nsec:
ts.tv_sec = 0
ts.tv_nsec = 0
else:
tv_sec = nsec / timespec.NSEC_PER_SEC
rem = nsec % timespec.NSEC_PER_SEC
ts.tv_sec = tv_sec
if rem < 0:
ts.tv_sec -= 1
rem += timespec.NSEC_PER_SEC
ts.tv_nsec = rem
return ts
def phys_addr(self, va):
"""Returns the physical address of a given virtual address va.
Linux has a direct mapping between the kernel virtual address space and
the physical memory. This is the difference between the virtual and
physical addresses (aka PAGE_OFFSET). This is defined by the __va macro:
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
"""
va_addr = obj.Pointer.integer_to_address(va)
page_offset_addr = obj.Pointer.integer_to_address(
self.GetPageOffset())
if va_addr >= page_offset_addr:
return (va_addr - page_offset_addr)
else:
return obj.NoneObject("Unable to translate VA 0x%x", va)
def GetPageOffset(self):
"""Gets the page offset."""
# This calculation needs to be here instead of the LinuxPageOffset
# parameter hook because it is used during profile autodetection, where
# a profile is not yet set on the session object.
self.session.logging.debug("Calculating page offset...")
if self.metadata("arch") == "I386":
return (self.get_constant("_text", False) -
self.get_constant("phys_startup_32", False))
elif self.metadata("arch") == "AMD64":
# We use the symbol phys_startup_64. If it's not present in the
# profile and it's different than the default, we should be able
# to autodetect the difference via kernel_slide.
phys_startup_64 = (self.get_constant("phys_startup_64", False) or
0x1000000)
return self.get_constant("_text", False) - phys_startup_64
elif self.metadata("arch") == "MIPS":
return 0x80000000
elif self.metadata("arch") == "ARM":
# This might not be always the same. According to arm/Kconfig,
# this only seems to be accurate with the default split in linux
# (VMSPLIT_3G). See arm/Kconfig. TODO: Use the VMSPLIT_3G config
# variable here.
# 1563 config PAGE_OFFSET
# 1564 hex
# 1565 default PHYS_OFFSET if !MMU
# 1566 default 0x40000000 if VMSPLIT_1G
# 1567 default 0x80000000 if VMSPLIT_2G
# 1568 default 0xC0000000
return 0xc0000000
else:
return obj.NoneObject("No profile architecture set.")
def nsec_to_clock_t(self, x):
"""Convers nanoseconds to a clock_t. Introduced in 3.17.
http://lxr.free-electrons.com/source/kernel/time/time.c?v=3.17#L703
"""
NSEC_PER_SEC = 1000000000L
USER_HZ = 100
if NSEC_PER_SEC % USER_HZ == 0:
return x / (NSEC_PER_SEC / USER_HZ)
elif USER_HZ % 512 == 0:
return ((x * USER_HZ) / 512) / (NSEC_PER_SEC / 512)
else:
return (x*9) / ((9 * NSEC_PER_SEC + (USER_HZ/2)) / USER_HZ)
# Legacy for old profiles
class Linux32(Linux):
pass
class Linux64(Linux):
@classmethod
def Initialize(cls, profile):
profile.set_metadata("arch", "AMD64")
super(Linux64, cls).Initialize(profile)
class LinuxConfigProfileLoader(obj.ProfileSectionLoader):
"""Linux profiles can carry the original Kconfig in the $CONFIG section."""
name = "$CONFIG"
def LoadIntoProfile(self, session, profile, config):
profile.kernel_config_options = config
return profile
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