class documentation

class Trace(object):

Entry point object for information related to a trace, mostly transitions & contexts.

The trace is represented as a series of Transitions objects (which are CPU instruction most of the time) that take the virtual machine from one state (Context object "before") to the next (Context object "after").

Warnings

This object is not meant to be constructed directly. Use RevenServer.trace instead.

Examples

>>> # From a reven_server
>>> trace = reven_server.trace

>>> print("Trace is {} transitions long".format(trace.transition_count()))
>>> print("From {} to {} via {}.format(trace.context_before(0), trace.context_after(0), trace.transition(0)))
>>> print(trace.transition(trace.transition_count() - 1)

Method	`__init__`	Undocumented
Property	`transition_count`	Property: Count of transitions in this trace.
Property	`first_transition`	Property: First transition in this trace.
Property	`last_transition`	Property: Last transition in this trace.
Property	`first_context`	Property: First context in this trace.
Property	`last_context`	Property: Last context in this trace.
Method	`transition`	Retrieve a transition from its unique id.
Method	`transitions`	Get a generator over the transitions in the trace.
Method	`context_before`	Retrieve the context before a transition from the latter's unique id.
Method	`context_after`	Retrieve the context after a transition from the latter's unique id.
Method	`contexts`	Get a generator over the contexts in the trace.
Property	`search`	Property: Get a `reven2.search.Search` instance, which is the entry point to find interesting points in the trace.
Method	`memory_accesses`	Get a generator over the previous/next memory accesses to a range of addresses defined by (address, size).
Method	`strings`	Get a generator over the strings matching the pattern
Method	`__repr__`	Undocumented
Instance Variable	`_data_source`	Undocumented
Instance Variable	`_ossi_data_source`	Undocumented
Property	`_rvn`	Undocumented
Method	`_context`	Undocumented

def __init__(self, _rvn, _ossi_data_source):

Undocumented

_data_source =

Undocumented

_ossi_data_source =

Undocumented

@property
_rvn =

Undocumented

@property
transition_count =

Property: Count of transitions in this trace.

Information

Returns an integer.

@property
first_transition =

Property: First transition in this trace.

Information

Returns a reven2.trace.Transition.

@property
last_transition =

Property: Last transition in this trace.

Information

Returns a reven2.trace.Transition.

@property
first_context =

Property: First context in this trace.

Information

Returns a reven2.trace.Context.

@property
last_context =

Property: Last context in this trace.

Information

Returns a reven2.trace.Context.

def transition(self, transition_id):

Retrieve a transition from its unique id.

Information

Returns	A `Transition`.
Raises	IndexError	if the unique id does not belong to the trace.

def transitions(self, start=None, stop=None, step=1):

Get a generator over the transitions in the trace.

Examples

Iterates on transitions from the beginning to the end of the trace.

>>> for transition in trace.transitions():
>>>     print(transition)
#0 push -0x2f
#1 push rbp
#2 jmp 0xfffff800c99455a0 ($+0x185)
#3 push rsi
#4 sub rsp, 0x150
#5 lea rbp, [rsp + 0x80]
...

Iterates on transitions from the end to the beginning of the trace.

>>> for transition in trace.transitions(step=-1):
>>>     print(transition)
#2847570054 je 0x7fff599d16d8 ($+0x270)
#2847570053 cmp rdi, rax
#2847570052 mov dword ptr [rbp - 0x61], r14d
#2847570051 mov r13d, r14d
#2847570050 mov dword ptr [rbp - 0x65], ecx
#2847570049 mov ecx, 0x10
...

Iterates on the 5 first transitions in increasing order.

>>> for transition in trace.transitions(stop=5):
>>>     print(transition)
#0 push -0x2f
#1 push rbp
#2 jmp 0xfffff800c99455a0 ($+0x185)
#3 push rsi
#4 sub rsp, 0x150

Iterates on 10 transitions somewhere in the trace, in increasing order, and 2 by 2.

>>> start = trace.transition(1000)
>>> stop = start + 10
>>> for transition in trace.transitions(start, stop, 2):
>>>     print(transition)
#1000 mov r12, rax
#1002 jne 0xfffff800c98053fc ($+0x81)
#1004 mov rcx, rbx
#1006 mov qword ptr [rsp + 8], rbx
#1008 sub rsp, 0x20

Iterates on the 5 last transitions in decreasing order.

>>> for transition in trace.transitions(stop=trace.transition_count - 6, step=-1):
>>>     print(transition)
#2847570054 je 0x7fff599d16d8 ($+0x270)
#2847570053 cmp rdi, rax
#2847570052 mov dword ptr [rbp - 0x61], r14d
#2847570051 mov r13d, r14d
#2847570050 mov dword ptr [rbp - 0x65], ecx

Information

Parameters	start	A `Transition` or an `int`(transition id) at which to start the generation. If `start` is `None`, then: * if step > 0, then start at the beginning of the trace. * if step < 0, then start at the end of the trace. `start` must be in trace (in [0, trace.transition_count - 1]).
	stop	A `Transition` or an `int`(transition id) at which to stop the generation. The `stop` is excluded from the generation. If `stop` is `None`, then: * if step > 0, then stop at the end of the trace. * if step < 0, then stop at the beginning of the trace. `stop - 1` must be in trace (not in [0, trace.transition_count - 1]).
	step	An `int` which indicates the increment (or decrement) between generated `Transition`s. If 'step' > 0, then transitions are yielded in increasing order. If 'step' < 0, then transitions are yielded in decreasing order. Default is set to 1.
Returns	a generator of `Transition`.
Raises	TypeError	if any argument is of the wrong type.
	ValueError	if one of the following cases: * `step == 0`. * `step > 0` and `start > stop`. * `step < 0` and `start < stop`.
	IndexError	if one of the following cases: * `start` is not in the trace (not in [0, trace.transition_count - 1]). * `step > 0` and `stop - 1` is not in the trace (not in [0, trace.transition_count - 1]). * `step < 0` and `stop + 1`) is not in the trace (not in [0, trace.transition_count - 1]).

def context_before(self, transition_id):

Retrieve the context before a transition from the latter's unique id.

Information

Returns	A `Context`.
Raises	IndexError	if the unique id does not belong to the trace.

def context_after(self, transition_id):

Retrieve the context after a transition from the latter's unique id.

Information

Returns	A `Context`.
Raises	IndexError	if the unique id does not belong to the trace

def contexts(self, start=None, stop=None, step=1):

Get a generator over the contexts in the trace.

Examples

Iterates on contexts from the beginning to the end of the trace.

>>> for context in trace.contexts():
>>>     print(context)
Context before #0
Context before #1
Context before #2
Context before #3
Context before #4
Context before #5
Context before #6
...

Iterates on contexts from the end to the beginning of the trace.

>>> for context in trace.contexts(step=-1):
>>>     print(context)
Context after #2847570054
Context before #2847570054
Context before #2847570053
Context before #2847570052
Context before #2847570051
Context before #2847570050
...

Iterates on the 5 first contexts in increasing order.

>>> stop = trace.context_before(5)
>>> for context in trace.context(stop=stop):
>>>     print(context)
Context before #0
Context before #1
Context before #2
Context before #3
Context before #4

Iterates on 10 contexts somewhere in the trace, in increasing order, and 2 by 2.

>>> start = trace.context_before(1000)
>>> stop = start + 10
>>> for context in trace.context(start, stop, 2):
>>>     print(context)
Context before #1000
Context before #1002
Context before #1004
Context before #1006
Context before #1008

Iterates on the 5 last contexts in decreasing order.

>>> stop = trace.context_after(trace.transition_count - 5)
>>> for context in trace.contexts(stop=stop, step=-1):
>>>     print(context)
Context after #2847570054
Context before #2847570054
Context before #2847570053
Context before #2847570052
Context before #2847570051

Information

Parameters	start	A `Context` at which to start the generation. If `start` is `None`, then: * start at the beginning of the trace if step > 0. * start at the end of the trace if step < 0.
	stop	A `Context` at which to stop the generation. The `stop` is excluded from the generation. If `stop` is `None`, then: * stop at the end of the trace if step > 0. * stop at the beginning of the trace if step < 0.
	step	An `int` which indicates the increment (or decrement) between generated `Context`s. If 'step' > 0, then contexts are yielded in increasing order. If 'step' < 0, then contexts are yielded in decreasing order. Default is set to 1.
Returns	a generator of `Context`.
Raises	TypeError	if any argument is of the wrong type.
	ValueError	if one of the following cases: * `step == 0`. * `step > 0` and `start > stop`. * `step < 0` and `start < stop`.

@property
search =

Property: Get a reven2.search.Search instance, which is the entry point to find interesting points in the trace.

Information

Returns A reven2.search.Search instance.

def memory_accesses(self, address, size, from_transition=None, to_transition=None, is_forward=True, operation=None, fetch_count=1000):

Get a generator over the previous/next memory accesses to a range of addresses defined by (address, size).

Performance

Returning a generator rather than a list allow to lazily compute the requested results. Calling next on the generator to get the next individual result should always be fast. Forcing eager computations of the results by converting the iterator to a list might be slow depending on the number of results.

Examples

>>> # Getting the first 10 accesses in the trace for range [0xffff88007fc03000, 0xffff88007fc04000)
>>> # (should always be fast):
>>> for (_, access) in itertools.izip(range(0, 10), trace.memory_accesses(0xffff88007fc03000, 4096,
>>> trace.transition(0))):
>>>     print(access)
[#39 call 0xffffffff81611fe0 ($+0x165133)]Write access at @phy:0x7fc03ec8 (virtual address:
        lin:0xffff88007fc03ec8) of size 8
[#41 call qword ptr [0xffffffff81c24448]]Write access at @phy:0x7fc03ec0 (virtual address:
        lin:0xffff88007fc03ec0) of size 8
[#42 push rdx]Write access at @phy:0x7fc03eb8 (virtual address: lin:0xffff88007fc03eb8) of size 8
[#48 pop rdx]Read access at @phy:0x7fc03eb8 (virtual address: lin:0xffff88007fc03eb8) of size 8
[#49 ret ]Read access at @phy:0x7fc03ec0 (virtual address: lin:0xffff88007fc03ec0) of size 8
[#51 push rdi]Write access at @phy:0x7fc03ec0 (virtual address: lin:0xffff88007fc03ec0) of size 8
[#52 popfq ]Read access at @phy:0x7fc03ec0 (virtual address: lin:0xffff88007fc03ec0) of size 8
[#54 ret ]Read access at @phy:0x7fc03ec8 (virtual address: lin:0xffff88007fc03ec8) of size 8
[#60 call 0xffffffff814abe30 ($-0x108f)]Write access at @phy:0x7fc03ec8 (virtual address:
        lin:0xffff88007fc03ec8) of size 8
[#62 push r14]Write access at @phy:0x7fc03ec0 (virtual address: lin:0xffff88007fc03ec0) of size 8

>>> # Getting the number of accesses in the trace for range [0xffff88007fc03000, 0xffff88007fc04000)
>>> # (can be slow if there are numerous accesses):
>>> len(list(trace.memory_accesses(0xffff88007fc03000, 4096, trace.transition(0))))
28413

>>> # Getting the last access in the trace to phy:0x36f05080 (will always be fast):
>>> last = trace.transition(trace.transition_count - 1)
>>> address = reven2.address.PhysicalAddress(0x36f05080)
>>> next(trace.memory_accesses(address, 1, last, is_forward=False))
MemoryAccess(transition=Transition(id=3515211), physical_address=PhysicalAddress(offset=0x36f05080), size=8,
        operation=MemoryAccessesOperation.Write, virtual_address=None)

Information

Parameters	address	First address of the searched range of addresses. Can be a class from the `reven2.address` module, or an integer. If an integer `x`, it will be interpreted as `ds:x`. If a virtual address, then it must be mapped (possibly to non-contiguous physical pages) at the context just before/after (depending on the direction) the from_transition.
	size	Size of the searched range of addresses.
	from_transition	`Transition` at which to start the search. The from_transition is included in the search results If `None`, start from the beginning/end of the trace in forward/backward direction, respectively. If specified, must be lower than/greater than `to_transition`, depending on the direction
	to_transition	`Transition` at which to stop the search. The to_transition is excluded from the search results If `None`, stop to the end/beginning of the trace in forward/backward direction, respectively. If specified, must be greater than/lower than `from_transition`, depending on the direction
	is_forward	If `True`, return the accesses at the same transition and after from_transition. Otherwise, return the accesses at the same transition and before from_transition.
	operation	Only return accesses whose operation equals the specified `reven2.memhist.MemoryAccessOperation`. If None, return accesses regardless of their operation.
	fetch_count	Technical parameter indicating how many accesses should be fetched from the server per query. Modifying this parameter allows to fine-tune performance according to the current use-case: If you intend to make a lot of queries that you expect to return only a few accesses, then you should use a small value (e.g., 100) If you intend to make a few queries that you expect to return a lot of accesses, then you should use a large value (e.g., 10000) The default value should provide sufficient performance in most cases. NOTE: Modifying this parameter does not modify the results of the query
Returns	a generator of `reven2.memhist.MemoryAccess`.
Raises	RuntimeError	if the memory history resource has not been generated.
	RuntimeError	if the passed address is virtual, and not mapped at the context before/after the from_transition (depending on the direction).
	ValueError	if size < 0.
	ValueError	if from_transition > to_transition in forward, or from_transition < to_transition in backward.
	ValueError	if fetch_count <= 0.

def _context(self, context_id):

Undocumented

def strings(self, pattern='', fetch_count=200):

Get a generator over the strings matching the pattern

Performance

Examples

>>> # Getting strings matching '*hello*' in the trace
>>> for string in trace.strings("hello")
>>>     print(string)
[#2545492692 - #2545492932] 'D:\>hello' of size 20 at address @lin:0xfffff90140081038
[#2583245618 - #2583245653] 'hello.exe' of size 18 at address @lin:0x15a2de19930
[#2583245992 - #2583246162] 'HELLO' of size 5 at address @lin:0xffffb0000f2331d2
[#2583245995 - #2583246018] 'Hello\0' of size 12 at address @lin:0xffffc000ea501fd4

>>> # Getting accesses of the string:
>>> string = next(strings)
>>> for memory_access in string.memory_accesses():
>>>     print(memory_access)
[#2594829 movdqu xmm0, xmmword ptr [rdx + rcx]]Write access at @phy:0x5274cfc0
        (virtual address: lin:0xffffc000e9dd2fc0) of size 16
[#2594830 movdqu xmm1, xmmword ptr [rdx + rcx + 0x10]]Read access at @phy:0x5274cfd0
        (virtual address: lin:0xffffc000e9dd2fd0) of size 16
[#2594836 movdqu xmm0, xmmword ptr [rdx + rcx]]Read access at @phy:0x5274cfe0
        (virtual address: lin:0xffffc000e9dd2fe0) of size 16
[#2594837 movdqu xmm1, xmmword ptr [rdx + rcx + 0x10]]Write access at @phy:0x5274cff0
        (virtual address: lin:0xffffc000e9dd2ff0) of size 8

Information

Parameters	pattern	a string pattern existing in the searched string. If `""`, match with all strings The search will match strings like `[pattern]` Note: A long pattern may impact on perfomance with large database
	fetch_count	Technical parameter indicating how many strings should be fetched from the server per query. Modifying this parameter allows to fine-tune performance according to the current use-case: If you intend to make a lot of queries that you expect to return only a few strings, then you should use a small value (e.g., 20) If you intend to make a few queries that you expect to return a lot of strings, then you should use a large value (e.g., 1000) The default value should provide sufficient performance in most cases. NOTE: Modifying this parameter does not modify the results of the query.
Returns	a generator of `reven2.string.String`.
Raises	RuntimeError	if the strings resource has not been generated.
	ValueError	if fetch_count <= 0.

def __repr__(self):

Undocumented

API Documentation for reven2, generated by pydoctor 21.2.2 at 2021-04-06 08:01:12.

reven2.trace.Trace

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`reven2.trace.Trace`