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code_coverage.py
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code_coverage.py
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import string
import sys
import time
from triton import *
from pintool import *
targetName = "serial.txt"
targetFd = None
isOpen = False
isRead = None
INPUT = dict()
TIME = 0
Triton = getTritonContext()
def getNewInput():
# Set of new inputs
inputs = list()
# Get path constraints from the last execution
pco = Triton.getPathConstraints()
# Get the astContext
astCtxt = Triton.getAstContext()
# We start with any input. T (Top)
previousConstraints = astCtxt.equal(astCtxt.bvtrue(), astCtxt.bvtrue())
# Go through the path constraints
for pc in pco:
# If there is a condition
if pc.isMultipleBranches():
# Get all branches
branches = pc.getBranchConstraints()
for branch in branches:
# Get the constraint of the branch which has been not taken
if branch['isTaken'] == False and Triton.getConcreteMemoryAreaValue(branch['dstAddr'], 5) != '\xe8\xe5\xfd\xff\xff':
# Ask for a model
models = Triton.getModel(astCtxt.land([previousConstraints, branch['constraint']]))
seed = dict()
for k, v in list(models.items()):
# Get the symbolic variable assigned to the model
symVar = Triton.getSymbolicVariableFromId(k)
# Save the new input as seed.
seed.update({symVar.getOrigin(): v.getValue()})
if seed:
inputs.append(seed)
# Update the previous constraints with true branch to keep a good path.
previousConstraints = astCtxt.land([previousConstraints, pc.getTakenPathConstraintAst()])
# Clear the path constraints to be clean at the next execution.
Triton.clearPathConstraints()
return inputs
def getMemoryString(addr):
index = 0
s = str()
while getCurrentMemoryValue(addr+index):
c = chr(getCurrentMemoryValue(addr+index))
s += ("" if c not in string.printable else c)
index += 1
return s
def syscallsEntry(threadId, std):
global isOpen
global isRead
global targetFd
if getSyscallNumber(std) == SYSCALL64.OPENAT:
name = getMemoryString(getSyscallArgument(std, 1))
if name == targetName:
isOpen = True
#print('[TT] Target name match: %s' %(name))
elif getSyscallNumber(std) == SYSCALL64.READ:
fd = getSyscallArgument(std, 0)
buff = getSyscallArgument(std, 1)
size = getSyscallArgument(std, 2)
if fd == targetFd:
isRead = {'buff': buff, 'size': size}
return
def syscallsExit(threadId, std):
global isOpen
global isRead
global targetFd
if isOpen:
targetFd = getSyscallReturn(std)
isOpen = False
#print('[TT] Target fd: %d' %(targetFd))
elif isRead is not None:
size = isRead['size']
buff = isRead['buff']
#Triton.concretizeAllRegister()
#Triton.concretizeAllMemory()
# for item in INPUT:
# for address, value in item.items():
# setCurrentMemoryValue(address, value)
for address, value in INPUT.items():
setCurrentMemoryValue(address, value)
print('SET ', address, ' TO ',value)
for index in range(size):
Triton.taintMemory(buff+index)
#Triton.setConcreteMemoryValue(buff+index, getCurrentMemoryValue(buff+index))
Triton.convertMemoryToSymbolicVariable(MemoryAccess(buff+index, CPUSIZE.BYTE))
isRead = None
return
def fini():
print 'finish'
def before(inst):
pass
#print inst
#print type(inst.getNextAddress())
#print getRoutineName(inst.getNextAddress())
#print type(inst.getAddress())
def entry_main(threadId):
print('[+] Take a snapshot')
takeSnapshot()
lastInput = list()
worklist = list([{0:0}])
def exit_main(threadId):
global TIME, INPUT, lastInput, worklist
#inputs = getNewInput()
if worklist:
seed = worklist[0]
lastInput += [dict(seed)]
del worklist[0]
newInputs = getNewInput()
for inputs in newInputs:
if inputs not in lastInput and inputs not in worklist:
worklist += [dict(inputs)]
if seed == {0:0}:
pass
else:
INPUT = seed
print 'INPUT: ',INPUT
print('[+] Restore a snapshot')
restoreSnapshot()
else:
disableSnapshot()
if __name__ == '__main__':
# Start the symbolic analysis from the Entry point
startAnalysisFromEntry()
#startAnalysisFromSymbol('main')
setupImageBlacklist(["libc", "ld-linux"])
#insertCall(before, INSERT_POINT.BEFORE)
insertCall(syscallsEntry, INSERT_POINT.SYSCALL_ENTRY)
insertCall(syscallsExit, INSERT_POINT.SYSCALL_EXIT)
insertCall(fini, INSERT_POINT.FINI)
insertCall(entry_main,INSERT_POINT.ROUTINE_ENTRY,'main')
insertCall(exit_main, INSERT_POINT.ROUTINE_EXIT, 'main')
# Run the instrumentation - Never returns
runProgram()