def enumerate_basicblocks_statically(instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
index = 0
# create the first block
new_block = False
block = BasicBlock(instructions[0].offset,
instructions[0],
name='block_%x' % instructions[0].offset)
for inst in instructions:
if new_block:
block = BasicBlock(inst.offset,
inst,
name='block_%x' % inst.offset)
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# absolute JUMP
if inst.is_branch_unconditional:
block.type = BASICBLOCK_UNCONDITIONAL
logging.debug("unconditional %x : %s", inst.offset, inst.name)
# conditionnal JUMPI
elif inst.is_branch_conditional:
block.type = BASICBLOCK_CONDITIONAL
logging.debug("conditional %x : %s", inst.offset, inst.name)
# Halt instruction : RETURN, STOP, ...
elif inst.is_halt: # and inst != instructions[-1]:
block.type = BASICBLOCK_TERMINAL
logging.debug("terminal %x : %s", inst.offset, inst.name)
# just falls to the next instruction
elif inst != instructions[-1] and \
instructions[index + 1].name == 'JUMPDEST':
block.type = BASICBLOCK_FALLTHROUGH
logging.debug("fallthrough %x : %s", inst.offset, inst.name)
# last instruction of the entire bytecode
elif inst == instructions[-1]:
block.type = BASICBLOCK_TERMINAL
if block.type != BASICBLOCK_DEFAULT:
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
index += 1
return basicblocks
def enumerate_basicblocks_statically(instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
index = 0
# create the first block
new_block = False
end_block = False
block = BasicBlock(instructions[0].offset,
instructions[0],
name='block_%x' % instructions[0].offset)
for inst in instructions:
if new_block:
block = BasicBlock(inst.offset,
inst,
name='block_%x' % inst.offset)
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# absolute JUMP
if inst.is_branch_unconditional:
new_block = True
# conditionnal JUMPI
elif inst.is_branch_conditional:
new_block = True
# Halt instruction : RETURN, STOP, ...
elif inst.is_halt: # and inst != instructions[-1]:
new_block = True
# just falls to the next instruction
elif inst != instructions[-1] and \
instructions[index + 1].name == 'JUMPDEST':
new_block = True
# last instruction of the entire bytecode
elif inst == instructions[-1]:
end_block = True
if new_block or end_block:
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
end_block = False
index += 1
return basicblocks
def enumerate_basicblocks_edges(instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
edges = list()
xrefs = enumerate_xref(instructions)
# create the first block
new_block = True
for inst in instructions:
if new_block:
block = BasicBlock(start_offset=inst.offset,
start_instr=inst,
name='block_%x' % inst.offset)
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# next instruction in xrefs list
if (inst.offset_end + 1) in xrefs:
# absolute JUMP
if inst.is_branch_unconditional:
edges.append(
Edge(block.name, 'block_%x' % xref_of_instr(inst),
EDGE_UNCONDITIONAL))
# conditionnal JUMPI / JUMPIF / ...
elif inst.is_branch_conditional:
edges.append(
Edge(block.name, 'block_%x' % xref_of_instr(inst),
EDGE_CONDITIONAL_TRUE))
edges.append(
Edge(block.name, 'block_%x' % (inst.offset_end + 1),
EDGE_CONDITIONAL_FALSE))
# Halt instruction : RETURN, STOP, RET, ...
elif inst.is_halt:
pass
# just falls to the next instruction
else:
edges.append(
Edge(block.name, 'block_%x' % (inst.offset_end + 1),
EDGE_FALLTHROUGH))
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
# add the last block
basicblocks.append(block)
edges = list(set(edges))
return (basicblocks, edges)
def enumerate_basicblocks_statically(instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
xrefs = enumerate_xref(instructions)
# create the first block
new_block = True
for inst in instructions:
if new_block:
block = BasicBlock(start_offset=inst.offset,
start_instr=inst,
name='block_%x' % inst.offset)
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# next instruction in list_ref
if (inst.offset_end + 1) in xrefs:
# absolute JUMP
if inst.is_branch_unconditional:
block.type = BASICBLOCK_UNCONDITIONAL
logging.debug("unconditional %x : %s", inst.offset, inst.name)
# conditionnal JUMPI / JUMPIF / ...
elif inst.is_branch_conditional:
block.type = BASICBLOCK_CONDITIONAL
logging.debug("conditional %x : %s", inst.offset, inst.name)
# Halt instruction : RETURN, STOP, RET, ...
elif inst.is_halt: # and inst != func.instructions[-1]:
block.type = BASICBLOCK_TERMINAL
logging.debug("terminal %x : %s", inst.offset, inst.name)
# just falls to the next instruction
else:
block.type = BASICBLOCK_FALLTHROUGH
logging.debug("fallthrough %x : %s", inst.offset, inst.name)
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
# add the last block
basicblocks.append(block)
basicblocks = list(set(basicblocks))
return basicblocks
def enum_blocks_edges(function_id, instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
edges = list()
branches = []
xrefs = []
intent = 0
blocks_tmp = []
blocks_list = []
# remove last instruction that is 'end' for the funtion
tt = instructions[:-1]
for index, inst in enumerate(tt):
if inst.is_block_terminator:
start, name = blocks_tmp.pop()
blocks_list.append((intent, start, inst.offset_end, name))
intent -= 1
if inst.is_block_starter: # in ['block', 'loop']:
blocks_tmp.append((inst.offset, inst.name))
intent += 1
if inst.is_branch:
branches.append((intent, inst))
blocks_list = sorted(blocks_list, key=lambda tup: tup[1])
for depth, inst in branches:
d2 = int(inst.operand_interpretation.split(' ')[1])
rep = next(((i, s, e, n) for i, s, e, n in blocks_list if (i == (depth - d2) and s < inst.offset and e > inst.offset_end)), None)
if rep:
i, start, end, name = rep
if name == 'loop':
value = start # else name == 'block'
elif name == 'block':
value = end
else:
value = None
inst.xref = value
xrefs.append(value)
# remove "block" instruction - not usefull graphicaly
# instructions = [x for x in instructions if x.name not in ['block', 'loop']]
# enumerate blocks
new_block = True
for index, inst in enumerate(instructions):
# creation of a block
if new_block:
block = BasicBlock(inst.offset,
inst,
name=format_bb_name(function_id, inst.offset))
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# next instruction is a jump target
if index < (len(instructions) - 1) and \
instructions[index + 1].offset in xrefs:
new_block = True
# absolute jump - br
elif inst.is_branch_unconditional:
new_block = True
# conditionnal jump - br_if
elif inst.is_branch_conditional:
new_block = True
# end of a block
elif index < (len(instructions) - 1) and \
inst.name in ['end']: # is_block_terminator
new_block = True
elif index < (len(instructions) - 1) and \
instructions[index + 1].name == 'else': # is_block_terminator
new_block = True
# start of a block
elif index < (len(instructions) - 1) and \
instructions[index + 1].is_block_starter:
new_block = True
# last instruction of the bytecode
elif inst.offset == instructions[-1].offset:
new_block = True
if new_block:
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
# TODO: detect and remove end instruction that end loop
# enumerate edges
for index, block in enumerate(basicblocks):
# get the last instruction
inst = block.end_instr
# unconditional jump - br
if inst.is_branch_unconditional:
edges.append(Edge(block.name, format_bb_name(function_id, inst.xref), EDGE_UNCONDITIONAL))
# conditionnal jump - br_if
elif inst.is_branch_conditional:
if inst.name == 'if':
edges.append(Edge(block.name, format_bb_name(function_id, inst.offset_end + 1), EDGE_CONDITIONAL_TRUE))
# if 'else' in [i.name for i in basicblocks[index + 1].instructions]:
# edges.append(Edge(block.name, format_bb_name(function_id, basicblocks[index + 2].start_instr.offset), EDGE_CONDITIONAL_FALSE))
edges.append(Edge(block.name, format_bb_name(function_id, basicblocks[index + 2].start_instr.offset), EDGE_CONDITIONAL_FALSE))
else:
edges.append(Edge(block.name, format_bb_name(function_id, inst.xref), EDGE_CONDITIONAL_TRUE))
edges.append(Edge(block.name, format_bb_name(function_id, inst.offset_end + 1), EDGE_CONDITIONAL_FALSE))
elif inst.offset != instructions[-1].offset:
# EDGE_FALLTHROUGH
edges.append(Edge(block.name, format_bb_name(function_id, inst.offset_end + 1), EDGE_FALLTHROUGH))
# prevent duplicate edges
edges = list(set(edges))
return basicblocks, edges
def enumerate_basicblocks_edges(function_id, instructions):
"""
Return a list of basicblock after
statically parsing given instructions
"""
basicblocks = list()
edges = list()
labels = []
intent = 0
# find label first
for index, inst in enumerate(instructions):
if inst.is_block_starter:
if inst.name in ['block', 'loop']:
intent += 1
elif inst.name in ['end']:
if intent > 0:
intent -= 1
#tmp_labels.append({'intent': intent,
# 'offset': inst.offset_end})
labels.append(inst.offset_end)
# print(function_id)
# print(labels)
'''
#e = [{'intent': 0, 'offset': 15}, {'intent': 1, 'offset': 17}, {'intent': 0, 'offset': 56}]
tmp_list = []
for index, x in enumerate(tmp_labels):
if x.get('intent') == 0:
labels += tmp_list[::-1]
tmp_list = []
tmp_list.append(x.get('offset'))
labels += tmp_list[::-1]
print(labels)
'''
# remove "block" instruction - not usefull graphicaly
instructions = [x for x in instructions if x.name not in ['block', 'loop']]
# create the first block
new_block = False
end_block = False
block = BasicBlock(instructions[0].offset,
instructions[0],
name=format_bb_name(function_id,
instructions[0].offset))
for index, inst in enumerate(instructions):
if new_block:
block = BasicBlock(inst.offset,
inst,
name=format_bb_name(function_id, inst.offset))
new_block = False
# add current instruction to the basicblock
block.instructions.append(inst)
# absolute jump - br
# br is *always* followed by end instruction
if inst.is_branch_unconditional:
end_block = True
jump_offset = int(inst.operand_interpretation.split(' ')[1])
if instructions[index + 1].name == 'end':
end_block = False
edges.append(
Edge(block.name,
format_bb_name(function_id, labels[jump_offset] + 1),
EDGE_UNCONDITIONAL))
# conditionnal jump - br_if
elif inst.is_branch_conditional:
end_block = True
jump_offset = int(inst.operand_interpretation.split(' ')[1])
edges.append(
Edge(block.name,
format_bb_name(function_id, labels[jump_offset] + 1),
EDGE_CONDITIONAL_TRUE))
edges.append(
Edge(
block.name,
format_bb_name(function_id,
instructions[index + 1].offset),
EDGE_CONDITIONAL_FALSE))
# end of a block
elif index < (len(instructions) - 1) and \
inst.name in ['end', 'else']: # is_block_terminator
end_block = True
if not instructions[index - 1].is_branch_unconditional:
edges.append(
Edge(
block.name,
format_bb_name(function_id,
instructions[index + 1].offset),
EDGE_FALLTHROUGH))
# start of a block
elif index < (len(instructions) - 1) and \
instructions[index + 1].is_block_starter:
end_block = True
edges.append(
Edge(
block.name,
format_bb_name(function_id,
instructions[index + 1].offset),
EDGE_FALLTHROUGH))
# last instruction of the entire bytecode
elif inst == instructions[-1]:
end_block = True
if end_block:
block.end_offset = inst.offset_end
block.end_instr = inst
basicblocks.append(block)
new_block = True
end_block = False
edges = list(set(edges))
return basicblocks, edges