virtual bool operator()(bool enabled, const Args &args) /*overrides*/ {
if (enabled) {
if (!triggered && args.insn->get_address()==when) {
triggered = true;
initialize_state(args.thread);
}
SgAsmX86Instruction *insn = isSgAsmX86Instruction(args.insn);
if (triggered && insn) {
RTS_Message *m = args.thread->tracing(TRACE_MISC);
m->mesg("%s: %s", name, unparseInstructionWithAddress(insn).c_str());
policy.get_state().registers.ip = SymbolicSemantics::ValueType<32>(insn->get_address());
semantics.processInstruction(insn);
rose::BinaryAnalysis::SMTSolver::Stats smt_stats = yices.get_stats();
m->mesg("%s: mem-cell list size: %zu elements\n", name, policy.get_state().memory.cell_list.size());
m->mesg("%s: SMT stats: ncalls=%zu, input=%zu bytes, output=%zu bytes\n",
name, smt_stats.ncalls, smt_stats.input_size, smt_stats.output_size);
yices.reset_stats();
#if 0
std::ostringstream ss; ss <<policy;
m->mesg("%s", ss.str().c_str());
#endif
}
}
return enabled;
}
/**************************************************************************
* Main function. This function is run on each node that is being traversed
* in the graph. For each node, we determine the successors and check
* if those have been previously seen. If yes, a cycle may exist.
**************************************************************************/
bool
CompassAnalyses::CycleDetection::Traversal::run(string& name, SgGraphNode* node,
SgGraphNode* previous){
// check known function calls and resolve variables
ROSE_ASSERT(node);
//cerr << " cycledetection->run " << node->get_name() << endl;
SgAsmFunction* func = isSgAsmFunction(node->get_SgNode());
if (func) {
// if the node is a function, we clear the visited nodes
// this should speed up our search
visited.clear();
return false;
}
successors.clear();
ROSE_ASSERT(vizzGraph);
vizzGraph->getSuccessors(node, successors);
vector<SgGraphNode*>::iterator succ = successors.begin();
for (;succ!=successors.end();++succ) {
// for each successor do...
SgGraphNode* next = *succ;
// if the node is an instruction, we check if it was visited
// if not, we add it to the visited set, otherwise a cycle is present
std::set<SgGraphNode*>::iterator it =visited.find(next);
if (it!=visited.end()) {
// found this node in visited list
SgAsmX86Instruction* nodeSg = isSgAsmX86Instruction(node->get_SgNode());
SgAsmX86Instruction* nextSg = isSgAsmX86Instruction(next->get_SgNode());
if (debug) {
std::string outputText = "Found possible cycle between ";
outputText+=stringifyX86InstructionKind(nodeSg->get_kind()) + " (";
outputText+=RoseBin_support::HexToString(nodeSg->get_address()) + ") and ";
outputText+=stringifyX86InstructionKind(nextSg->get_kind()) + " (";
outputText+=RoseBin_support::HexToString(nextSg->get_address()) + ")";
std::cerr << outputText << std::endl;
output->addOutput(new CheckerOutput(nodeSg, outputText));
}
bool validCycle = checkIfValidCycle(node,next);
if (validCycle) {
std::string outputText = "Found cycle between ";
outputText+=stringifyX86InstructionKind(nodeSg->get_kind()) + " (";
outputText+=RoseBin_support::HexToString(nodeSg->get_address()) + ") and ";
outputText+=stringifyX86InstructionKind(nextSg->get_kind()) + " (";
outputText+=RoseBin_support::HexToString(nextSg->get_address()) + ")";
std::cerr << outputText << std::endl;
output->addOutput(new CheckerOutput(nodeSg, outputText));
cycleFound[node]=next;
} else {
if (debug)
std::cerr << "This is not a cyclic node " << std::endl;
}
}
}
visited.insert(node);
return false;
}
/** Returns a string containing the specified operand. */
std::string unparseX86Expression(SgAsmExpression *expr, const AsmUnparser::LabelMap *labels,
const RegisterDictionary *registers) {
/* Find the instruction with which this expression is associated. */
SgAsmX86Instruction *insn = NULL;
for (SgNode *node=expr; !insn && node; node=node->get_parent()) {
insn = isSgAsmX86Instruction(node);
}
ASSERT_not_null(insn);
return unparseX86Expression(expr, labels, registers, insn->get_kind()==x86_lea);
}
/** Add edges to graph from functions that call system calls to system calls.
*
* The first 1000 vertexes (0 to 999) in the graph is reserved for system calls, which is many more than the actual system
* calls in linux. */
void
add_syscall_edges(DirectedGraph* G, std::vector<SgAsmFunction*>& all_functions)
{
// Detect all system calls and add an edge from the function to the function to the system call
for (unsigned int caller_id = 0; caller_id < all_functions.size(); ++caller_id) {
SgAsmFunction *func = all_functions[caller_id];
std::vector<SgAsmInstruction*> insns = SageInterface::querySubTree<SgAsmInstruction>(func);
for (std::vector<SgAsmInstruction*>::iterator inst_it = insns.begin(); inst_it != insns.end(); ++inst_it) {
SgAsmX86Instruction *insn = isSgAsmX86Instruction(*inst_it);
if (insn == NULL)
continue;
SgAsmBlock *block = SageInterface::getEnclosingNode<SgAsmBlock>(insn);
// On linux system calls are always interrups and all interrupts are system calls
if (insn && block && insn->get_kind()==x86_int) {
const SgAsmExpressionPtrList &opand_list = insn->get_operandList()->get_operands();
SgAsmExpression *expr = opand_list.size()==1 ? opand_list[0] : NULL;
//semantically execute the basic block to find out which sytem call was called
if (expr && expr->variantT()==V_SgAsmIntegerValueExpression &&
0x80==isSgAsmIntegerValueExpression(expr)->get_value()) {
const SgAsmStatementPtrList &stmts = block->get_statementList();
size_t int_n;
for (int_n=0; int_n<stmts.size(); int_n++) {
if (isSgAsmInstruction(stmts[int_n])==insn)
break;
}
typedef PartialSymbolicSemantics::Policy<PartialSymbolicSemantics::State,
PartialSymbolicSemantics::ValueType> Policy;
typedef X86InstructionSemantics<Policy, PartialSymbolicSemantics::ValueType> Semantics;
Policy policy;
Semantics semantics(policy);
try {
semantics.processBlock(stmts, 0, int_n);
if (policy.readRegister<32>("eax").is_known()) {
int nr = policy.readRegister<32>("eax").known_value();
boost::add_edge(caller_id, nr, *G);
}
} catch (const Semantics::Exception&) {
} catch (const Policy::Exception&) {
}
}
}
}
}
}
void
CompassAnalyses::BinaryInterruptAnalysis::Traversal::getValueForDefinition(std::vector<uint64_t>& vec,
std::vector<uint64_t>& positions,
uint64_t& fpos,
SgGraphNode* node,
std::pair<X86RegisterClass, int> reg ) {
set <SgGraphNode*> defNodeSet = getDefFor(node, reg);
if (RoseBin_support::DEBUG_MODE())
cout << " size of found NodeSet = " << defNodeSet.size() <<endl;
set <SgGraphNode*>::const_iterator it = defNodeSet.begin();
for (;it!=defNodeSet.end();++it) {
SgGraphNode* defNode = *it;
if (RoseBin_support::DEBUG_MODE() && defNode)
cout << " investigating ... " << defNode->get_name() <<endl;
ROSE_ASSERT(defNode);
SgAsmX86Instruction* inst = isSgAsmX86Instruction(defNode->get_SgNode());
ROSE_ASSERT(inst);
positions.push_back(inst->get_address());
// the right hand side of the instruction is either a use or a value
bool memRef = false, regRef = false;
std::pair<X86RegisterClass, int> regRight =
check_isRegister(defNode, inst, true, memRef, regRef);
if (RoseBin_support::DEBUG_MODE()) {
string regName = unparseX86Register(RegisterDescriptor(reg.first, reg.second, 0, 64), NULL);
string regNameRight = unparseX86Register(RegisterDescriptor(regRight.first, regRight.second, 0, 64), NULL);
cout << " VarAnalysis: getValueForDef . " << regName << " right hand : " << regNameRight <<endl;
}
if (!regRef) {
// it is either a memref or a value
if (!memRef) {
// get value of right hand side instruction
uint64_t val = getValueOfInstr(inst, true);
vec.push_back(val);
fpos = inst->get_address();
if (RoseBin_support::DEBUG_MODE())
cout << " found valueOfInst = " << RoseBin_support::ToString(val) <<endl;
}
} else {
// it is a register reference. I.e we need to follow the usage edge to find the
// definition of that node
SgGraphNode* usageNode = g_algo->getDefinitionForUsage(vizzGraph,defNode);
if (usageNode && usageNode!=node) {
if (RoseBin_support::DEBUG_MODE() && usageNode)
cout << " following up usage for " << usageNode->get_name() <<endl;
getValueForDefinition(vec, positions, fpos, usageNode, regRight);
} else {
// we look at the same node.
cout << " ERROR :: Either following usage to itself or usageNode = NULL. " << usageNode << endl;
}
}
}
}
int
main(int argc, char *argv[])
{
// Parse command-line
int argno=1;
for (/*void*/; argno<argc && '-'==argv[argno][0]; ++argno) {
if (!strcmp(argv[argno], "--")) {
++argno;
break;
} else {
std::cerr <<argv[0] <<": unrecognized switch: " <<argv[argno] <<"\n";
exit(1);
}
}
if (argno+1!=argc) {
std::cerr <<"usage: " <<argv[0] <<" [SWITCHES] [--] SPECIMEN\n";
exit(1);
}
std::string specimen_name = argv[argno++];
// Open the file
rose_addr_t start_va = 0;
MemoryMap map;
size_t file_size = map.insertFile(specimen_name, start_va);
map.at(start_va).limit(file_size).changeAccess(MemoryMap::EXECUTABLE, 0);
// Try to disassemble every byte, and print the CALL/FARCALL targets
size_t ninsns=0, nerrors=0;
Disassembler *disassembler = new DisassemblerX86(4);
for (rose_addr_t offset=0; offset<file_size; ++offset) {
try {
rose_addr_t insn_va = start_va + offset;
SgAsmX86Instruction *insn = isSgAsmX86Instruction(disassembler->disassembleOne(&map, insn_va));
if (insn && (x86_call==insn->get_kind() || x86_farcall==insn->get_kind())) {
++ninsns;
rose_addr_t target_va;
if (insn->getBranchTarget(&target_va))
std::cout <<StringUtility::addrToString(insn_va) <<": " <<StringUtility::addrToString(target_va) <<"\n";
}
} catch (const Disassembler::Exception &e) {
++nerrors;
}
}
std::cerr <<specimen_name <<": " <<ninsns <<" instructions; " <<nerrors <<" errors\n";
return 0;
}
virtual void visit(SgNode* n) {
SgAsmX86Instruction* insn = isSgAsmX86Instruction(n);
if (!insn) return;
if (insn->get_kind() != x86_call) return;
//cerr << "Found call xxx at " << hex << insn->get_address() << endl;
uint64_t tgtAddr;
if (!insn->getBranchTarget(&tgtAddr)) return;
//cerr << "Found call at " << hex << insn->get_address() << " with known target " << hex << tgtAddr << endl;
SgAsmInstruction* tgt = info->getInstructionAtAddress(tgtAddr);
if (!tgt) return;
//cerr << "Found target insn" << endl;
SgNode* f = tgt;
while (f && !isSgAsmBlock(f) && !isSgAsmFunction(f)) f = f->get_parent();
if (!f) return;
//cerr << "Found function of target" << endl;
uint64_t next = insn->get_address() + insn->get_raw_bytes().size();
info->returnTargets[isSgAsmStatement(f)].insert(next);
}
bool
RoseBin_DataFlowAnalysis::existsPath(SgGraphNode* start, SgGraphNode* end) {
// make sure its not a SgAsmCall and the next node is a DirectedControlFlowEdge
ROSE_ASSERT(g_algo->info);
bool exists = false;
ROSE_ASSERT(start);
ROSE_ASSERT(end);
SgAsmX86Instruction* next = isSgAsmX86Instruction(start);
SgAsmX86Instruction* endAsm = isSgAsmX86Instruction(end);
if (next && endAsm) {
while (next!=endAsm) {
next = isSgAsmX86Instruction(next->cfgBinFlowOutEdge(g_algo->info));
if (next==NULL)
break;
if ((next->get_kind() == x86_call || next->get_kind() == x86_ret) && next!=endAsm)
break;
}
exists = true;
}
return exists;
}
std::string normalizeInstructionsToHTML(std::vector<SgAsmX86Instruction*>::iterator beg,
std::vector<SgAsmX86Instruction*>::iterator end)
{
string normalizedUnparsedInstructions;
map<SgAsmExpression*, size_t> valueNumbers[3];
numberOperands( beg,end, valueNumbers);
// Unparse the normalized forms of the instructions
for (; beg != end; ++beg ) {
SgAsmX86Instruction* insn = *beg;
string mne = insn->get_mnemonic();
boost::to_lower(mne);
mne = "<font color=\"red\">" + htmlEscape(mne)+"</font>";
normalizedUnparsedInstructions += mne;
const SgAsmExpressionPtrList& operands = getOperands(insn);
// Add to total for this variant
// Add to total for each kind of operand
size_t operandCount = operands.size();
normalizedUnparsedInstructions += "<font color=\"blue\">";
for (size_t i = 0; i < operandCount; ++i) {
SgAsmExpression* operand = operands[i];
ExpressionCategory cat = getCategory(operand);
map<SgAsmExpression*, size_t>::const_iterator numIter = valueNumbers[(int)cat].find(operand);
assert (numIter != valueNumbers[(int)cat].end());
size_t num = numIter->second;
normalizedUnparsedInstructions += (cat == ec_reg ? " R" : cat == ec_mem ? " M" : " V") + boost::lexical_cast<string>(num);
}
normalizedUnparsedInstructions += "; </font> <br> ";
}
return normalizedUnparsedInstructions;
};
SgAsmX86Instruction*
buildX86MultibyteNopInstruction(size_t nBytes) {
ASSERT_require(nBytes > 0);
ASSERT_require(nBytes <= 9);
SgAsmX86Instruction *instruction = new SgAsmX86Instruction(0, "nop", x86_nop,
x86_insnsize_32, x86_insnsize_32, x86_insnsize_32);
// Build a simple version of multi-byte nop using repeated prefixes.
SgUnsignedCharList insnbuf;
for (size_t i = 1; i < nBytes; i++)
insnbuf.push_back(0x66);
insnbuf.push_back(0x90);
instruction->set_raw_bytes(insnbuf);
instruction->set_lockPrefix(false);
instruction->set_repeatPrefix(x86_repeat_none);
SgAsmOperandList *operands = new SgAsmOperandList();
instruction->set_operandList(operands);
operands->set_parent(instruction);
return instruction;
}
BtorTranslationPolicy::BtorTranslationPolicy(BtorTranslationHooks* hooks, uint32_t minNumStepsToFindError, uint32_t maxNumStepsToFindError, SgProject* proj): problem(), hooks(hooks), regdict(NULL) {
assert (minNumStepsToFindError >= 1); // Can't find an error on the first step
assert (maxNumStepsToFindError < 0xFFFFFFFFU); // Prevent overflows
assert (minNumStepsToFindError <= maxNumStepsToFindError || maxNumStepsToFindError == 0);
makeRegMap(origRegisterMap, "");
makeRegMapZero(newRegisterMap);
isValidIp = false_();
validIPs.clear();
Comp stepCount = problem.build_var(32, "stepCount_saturating_at_" + boost::lexical_cast<std::string>(maxNumStepsToFindError + 1));
addNext(stepCount, ite(problem.build_op_eq(stepCount, number<32>(maxNumStepsToFindError + 1)), number<32>(maxNumStepsToFindError + 1), problem.build_op_inc(stepCount)));
resetState = problem.build_op_eq(stepCount, zero(32));
errorsEnabled =
problem.build_op_and(
problem.build_op_ugte(stepCount, number<32>(minNumStepsToFindError)),
(maxNumStepsToFindError == 0 ?
true_() :
problem.build_op_ulte(stepCount, number<32>(maxNumStepsToFindError))));
{
vector<SgNode*> functions = NodeQuery::querySubTree(proj, V_SgAsmFunction);
for (size_t i = 0; i < functions.size(); ++i) {
functionStarts.push_back(isSgAsmFunction(functions[i])->get_address());
// fprintf(stderr, "functionStarts 0x%"PRIx64"\n", isSgAsmFunction(functions[i])->get_address());
}
}
{
vector<SgNode*> blocks = NodeQuery::querySubTree(proj, V_SgAsmBlock);
for (size_t i = 0; i < blocks.size(); ++i) {
SgAsmBlock* b = isSgAsmBlock(blocks[i]);
if (!b->get_statementList().empty() && isSgAsmX86Instruction(b->get_statementList().front())) {
blockStarts.push_back(b->get_address());
// fprintf(stderr, "blockStarts 0x%"PRIx64"\n", b->get_address());
}
}
}
{
vector<SgNode*> calls = NodeQuery::querySubTree(proj, V_SgAsmX86Instruction);
for (size_t i = 0; i < calls.size(); ++i) {
SgAsmX86Instruction* b = isSgAsmX86Instruction(calls[i]);
if (b->get_kind() != x86_call) continue;
returnPoints.push_back(b->get_address() + b->get_raw_bytes().size());
// fprintf(stderr, "returnPoints 0x%"PRIx64"\n", b->get_address() + b->get_raw_bytes().size());
}
}
{
vector<SgNode*> instructions = NodeQuery::querySubTree(proj, V_SgAsmX86Instruction);
for (size_t i = 0; i < instructions.size(); ++i) {
SgAsmX86Instruction* b = isSgAsmX86Instruction(instructions[i]);
validIPs.push_back(b->get_address());
}
}
}
// see base class
bool
SgAsmX86Instruction::isFunctionCallFast(const std::vector<SgAsmInstruction*>& insns, rose_addr_t *target, rose_addr_t *return_va)
{
if (insns.empty())
return false;
SgAsmX86Instruction *last = isSgAsmX86Instruction(insns.back());
if (!last)
return false;
// Quick method based only on the kind of instruction
if (x86_call==last->get_kind() || x86_farcall==last->get_kind()) {
last->getBranchTarget(target);
if (return_va)
*return_va = last->get_address() + last->get_size();
return true;
}
return false;
}
std::string
RoseBin_GMLGraph::getInternalNodes( SgGraphNode* node,
bool forward_analysis, SgAsmNode* internal) {
SgAsmInstruction* bin_inst = isSgAsmInstruction(internal);
SgAsmX86Instruction* control = isSgAsmX86Instruction(internal);
// get the unparser string!
string eval = "";
string name="noname";
string regs = "";
// specifies that this node has no destination address
nodest_jmp = false;
// specifies that there is a node that has a call error (calling itself)
error =false;
// specifies a call to a unknown location
nodest_call = false;
// specifies where its an int instruction
interrupt = false;
// specifies whether a node has been visited (dfa)
checked = false;
dfa_standard = false;
dfa_resolved_func =false;
dfa_unresolved_func=false;
string dfa_info="";
string dfa_variable="";
string visitedCounter="";
map < int , string> node_p = node->get_properties();
map < int , string>::iterator prop = node_p.begin();
string type = "removed";//node->get_type();
for (; prop!=node_p.end(); ++prop) {
int addr = prop->first;
// cerr << " dot : property for addr : " << addr << " and node " << hex_address << endl;
if (addr==SgGraph::name)
name = prop->second;
else if (addr==SgGraph::eval)
eval = prop->second;
else if (addr==SgGraph::regs)
regs = prop->second;
else if (addr==SgGraph::nodest_jmp)
nodest_jmp = true;
else if (addr==SgGraph::itself_call)
error = true;
else if (addr==SgGraph::nodest_call)
nodest_call = true;
else if (addr==SgGraph::interrupt)
interrupt = true;
else if (addr==SgGraph::done)
checked = true;
else if (addr==SgGraph::dfa_standard)
dfa_standard = true;
else if (addr==SgGraph::dfa_resolved_func) {
dfa_resolved_func = true;
dfa_info = prop->second;
} else if (addr==SgGraph::dfa_unresolved_func) {
dfa_unresolved_func = true;
dfa_info = prop->second;
} else if (addr==SgGraph::dfa_variable) {
dfa_variable = prop->second;
} else if (addr==SgGraph::visitedCounter) {
visitedCounter = prop->second;
} else {
cerr << " *************** dotgraph: unknown property found :: " << addr << endl;
}
}
if (bin_inst) {
type += " " + bin_inst->class_name();
}
string add = "";
string typeNode = "";
if (control->get_kind() == x86_call || control->get_kind() == x86_ret) {
typeNode += " Type_ \"[ 67108864 FUNCTION_NODE ]\" \n";
if (nodest_call)
add = " FF9900 ";
else if (error)
add = " 3399FF ";
else
add = " FFCCFF ";
} else if (control->get_kind() == x86_jmp) {
typeNode += " Type_ \"[ 67108864 FILE_NODE ]\" \n";
if (nodest_jmp)
add = " FF0000 ";
else
add = " 00FF00 ";
} else
if (x86InstructionIsControlTransfer(control)) {
typeNode += " Type_ \"[ 67108864 CLASS_NODE ]\" \n";
if (control->get_kind() == x86_int)
add = " 0000FF ";
else
add = " 008800 ";
} else {
add = " FFFF66 ";
}
if (checked)
add = " 777777 ";
if (dfa_standard)
add = " FFFF00 ";
if (dfa_resolved_func)
add = " 00FF00 ";
if (dfa_unresolved_func)
add = " FF0000 ";
string nodeStr = "";
regs+=eval;
// cant get the extra register info printed in gml format
// because multiline is not supported? (tps 10/18/07)
name = name/*+" " +regs + " " +dfa_variable+" "+"vis:"+visitedCounter */;
nodeStr= " label \"" + name+"\"\n "+typeNode;
int length = name.length();
SgAsmX86Instruction* pre = NULL; // isSgAsmX86Instruction(bin_inst->cfgBinFlowInEdge());
if (pre==NULL) {
// first node
nodeStr +=" first_ 1 \n";
} else {
if (pre->get_kind() == x86_ret || pre->get_kind() == x86_hlt) {
// this instruction must be suspicious
add =" 0000FF ";
}
}
nodeStr += " Node_Color_ " + add + " \n";
nodeStr += " graphics [ h 30.0 w " + RoseBin_support::ToString(length*7) + " type \"rectangle\" fill \"#" + add + "\" ]\n";
return nodeStr;
}
// Analyze the allocation type and location of this-pointers.
void ThisPtrUsage::analyze_alloc() {
// Set the allocation type to unknown by default.
alloc_type = AllocUnknown;
// Use the type returned from get_memory_type() to determine our allocation type. Perhaps in
// the future thse can be fully combined, but this was what was required to support non-zero
// ESP initialization.
MemoryType type = this_ptr->get_memory_type();
if (type == StackMemLocalVariable) {
alloc_type = AllocLocalStack;
}
else if (type == StackMemParameter) {
alloc_type = AllocParameter;
}
else if (type == UnknownMem) {
// This code is really a function of get_memory_type() still being broken.
// If we're not a constant address (global), skip this function.
if (!this_ptr->is_number() || this_ptr->get_width() > 64) return;
// This is a bit hackish, but also reject obviously invalid constants.
size_t num = this_ptr->get_number();
// Here's a place where we're having the age old debate about how to tell what is an
// address with absolutely no context. Cory still likes consistency. Others have
// suggested that we should be using the memory map despite all of it's flaws...
// if (!global_descriptor_set->memory_in_image(num)) return;
if (num < 0x10000 || num > 0x7FFFFFFF) return;
// Otherwise, we look like a legit global address?
alloc_type = AllocGlobal;
}
else {
return;
}
// It's not actually clear why we're looking for the allocation instruction. Perhaps we
// should quit doing this and just use the tests above. At least for now though, looking for
// the common pattern allows us to detect some unusual situations. Wes' previous logic also
// filtered by requiring LEA instructions, so we're preserving that limit.
// This code previously relied on the first-creator-of-read feature of modifiers, which we're
// retiring. Even though it's not clear that this code is required, I've updated it to use
// latest definers in place of modifiers, only we haven't switch to just using the _latest_
// definers yet so it needed some additional filtering to determine which definer to use.
PDG* pdg = fd->get_pdg();
// Shouldn't happen.
if (!pdg) return;
const DUAnalysis& du = pdg->get_usedef();
// This is hackish too. We need it for debugging so that we have some way of reporting which
// instructions are involved in the confusion.
SgAsmInstruction* first_insn = NULL;
for (SgAsmInstruction *ginsn : this_ptr->get_defining_instructions()) {
// For debugging so that we have an address.
if (first_insn == NULL) first_insn = ginsn;
SgAsmX86Instruction *insn = isSgAsmX86Instruction(ginsn);
if (insn == NULL) continue;
// Since definers isn't the "latest" definer just yet, filter our subsequent analysis to
// the one that wrote the this-ptr value. This is hackish and wrong because we shouldn't
// have to filter. But maybe once we can upgrade , this code can go away...
auto writes = du.get_writes(insn);
bool found_write = false;
for (const AbstractAccess& aa : writes) {
if (aa.value->get_expression()->isEquivalentTo(this_ptr->get_expression())) {
found_write = true;
break;
}
}
// If this instruction didn't write the this-ptr, it's not the one that we're looking for.
if (!found_write) continue;
// If we're here, this should be the instruction that defined the this-pointer.
// If we're a local variable and we've found an LEA instruction, that's probably the one
// we're looking for.
if (alloc_type == AllocLocalStack && insn->get_kind() == x86_lea) {
alloc_insn = ginsn;
GDEBUG << "Stack allocated object: " << *(this_ptr->get_expression()) << " at "
<< debug_instruction(alloc_insn) << LEND;
return;
}
// For global variables, the typical cases are move or push instructions.
else if (alloc_type == AllocGlobal &&
(insn->get_kind() == x86_mov || insn->get_kind() == x86_push)) {
alloc_insn = ginsn;
GDEBUG << "Global static object: " << *(this_ptr->get_expression()) << " at "
<< debug_instruction(alloc_insn) << LEND;
return;
}
// For passed parameters, we should probably be looking for the instruction that reads the
// undefined this-pointer value. This code was sufficient at the time...
else if (alloc_type == AllocParameter) {
GDEBUG << "Passed object: " << *(this_ptr->get_expression()) << LEND;
return;
}
}
if (first_insn == NULL) {
GDEBUG << "No allocation instruction found for " << *(this_ptr->get_expression())
<< " alloc_type=" << Enum2Str(alloc_type) << LEND;
}
else {
GDEBUG << "No allocation instruction found for " << *(this_ptr->get_expression())
<< " alloc_type=" << Enum2Str(alloc_type) << " at " << debug_instruction(first_insn) << LEND;
}
// Based on evaluation of the test suite, if we've reached this point, something's gone
// wrong, and it's very unclear if we're really the allocation type we thought we were.
// Perhaps it's better to be cautious and retract our allocation type claims. We could also
// choose to return the best guess of our type here, by removing this line.
//alloc_type = AllocUnknown;
return;
}
// Run natively and return number of instructions executed and reason for termination.
static std::pair<size_t, std::string>
runNatively(const Settings &settings, const std::string &specimenName, Sawyer::Optional<rose_addr_t> initVa,
const P2::Partitioner &partitioner, rose_addr_t randomAddress) {
Stream debug(mlog[DEBUG]);
BinaryDebugger debugger(specimenName);
if (debugger.isTerminated()) {
mlog[FATAL] <<"child " <<debugger.isAttached() <<" " <<debugger.howTerminated() <<" before we could gain control\n";
exit(1);
}
// Allow child to run until we hit the desired address.
if (initVa) {
debugger.setBreakpoint(*initVa);
debugger.runToBreakpoint();
debugger.clearBreakpoint(*initVa);
if (debugger.isTerminated()) {
mlog[FATAL] <<"child " <<debugger.isAttached() <<" " <<debugger.howTerminated()
<<" without reaching " <<addrToString(*initVa) <<"\n";
exit(1);
}
}
// Show specimen address map so we can verify that the Linux loader used the same addresses we used.
// We could have shown it earlier, but then we wouldn't have seen the results of dynamic linking.
if (settings.showMaps) {
std::cout <<"Linux loader specimen memory map:\n";
system(("cat /proc/" + numberToString(debugger.isAttached()) + "/maps").c_str());
}
// Branch to the starting address
debug <<"branching to " <<addrToString(randomAddress) <<"\n";
debugger.executionAddress(randomAddress);
std::string terminationReason;
size_t nExecuted = 0; // number of instructions executed
while (1) {
// Check for and avoid system calls if necessary
if (!settings.allowSyscalls) {
rose_addr_t eip = debugger.executionAddress();
SgAsmX86Instruction *insn = isSgAsmX86Instruction(partitioner.instructionProvider()[eip]);
if (!insn || insn->isUnknown()) {
if (settings.showInsnTrace)
std::cout <<"at " <<addrToString(eip) <<": " <<(insn?"no":"unknown") <<" instruction\n";
terminationReason = "executed at " + addrToString(eip) +" which we don't know about";
break;
}
if (settings.showInsnTrace)
std::cout <<"at " <<unparseInstructionWithAddress(insn) <<"\n";
if (insn->get_kind() == x86_int || insn->get_kind() == x86_sysenter) {
terminationReason = "tried to execute a system call";
break;
}
}
// Single-step
if (debug)
debug <<"single stepping at " <<addrToString(debugger.executionAddress()) <<"\n";
debugger.singleStep();
if (debugger.isTerminated()) {
terminationReason = debugger.howTerminated();
break;
}
++nExecuted;
if (settings.maxInsns!=0 && nExecuted>=settings.maxInsns) {
terminationReason = "reached instruction limit";
break;
}
}
debugger.terminate();
return std::make_pair(nExecuted, terminationReason);
}
/***********************************************************************
* (10/31/07) tps: Traverses the graph for each node in rootNodes
* and applies to each node the evaluate function
* which can be either def_use, variable detection or emulation
* Each node in the controlflow of rootNode is traversed (forward)
* and only if the hasChanged function returns false, the algorithm
* comes to a fixpoint
***********************************************************************/
void
RoseBin_DataFlowAnalysis::traverseGraph(vector <SgGraphNode*>& rootNodes,
RoseBin_DataFlowAbstract* analysis,
bool interprocedural){
if (RoseBin_support::DEBUG_MODE_MIN())
cerr << " traverseGraph : debug: " << RoseBin_support::resBool(RoseBin_support::DEBUG_MODE()) <<
" debug_min : " << RoseBin_support::resBool(RoseBin_support::DEBUG_MODE_MIN()) << endl;
// Number of functions traversed
int funcNr =0;
// ---------------------------------------------------------------------
// stores the nodes that still needs to be visited
// vector<SgGraphNode*> worklist;
deque<SgGraphNode*> worklist;
nodeHashSetType worklist_hash;
// a vector of successors of the current node
vector<SgGraphNode*> successors;
// ---------------------------------------------------------------------
// iterate through all functions
vector<SgGraphNode*>::iterator it = rootNodes.begin();
for (; it!=rootNodes.end();++it) {
// current node
SgGraphNode* node = *it;
string func_name = vizzGraph->getProperty(SgGraph::name, node);
RoseBin_support::checkText(func_name);
funcNr++;
if (RoseBin_support::DEBUG_MODE()) {
cout << "\n\n ----------- dataflow analysis of function ("+RoseBin_support::ToString(funcNr)+"/"+
RoseBin_support::ToString(rootNodes.size())+") : " << func_name <<
" visited size : " << visited.size() <<
" total visited nodes : " << nrOfNodesVisited << endl;
// debug
}
if (RoseBin_support::DEBUG_MODE_MIN()) {
cerr << " ----------- dataflow analysis of function ("+RoseBin_support::ToString(funcNr)+"/"+
RoseBin_support::ToString(rootNodes.size())+") : " << func_name <<
" visited size : " << visited.size() <<
" total visited nodes : " << nrOfNodesVisited <<
" def size : " << analysis->getDefinitionSize() << endl;
}
// indicates whether the current value for this node has changed
bool hasChanged=false;
// pushback into worklist and visited list
worklist.push_back(node);
worklist_hash.insert(node);
visited.insert(node);
visitedCounter[node] = 1;
vector <SgGraphNode*> pre;
// while there are still graph nodes in the worklist do
while (worklist.size()>0) {
nrOfNodesVisited++;
// the new node is taken from the back of the worklist
//node = worklist.back();
//worklist.pop_back();
node = worklist.front();
worklist.pop_front();
worklist_hash.erase(node);
// get the successors of the current node and store in successors vector
string name = vizzGraph->getProperty(SgGraph::name, node);
//if (RoseBin_support::DEBUG_MODE_MIN() && node)
// if (node->get_SgNode())
// cerr << node->get_SgNode()->class_name() << " " << node << " " << node->get_name() << endl;
if (RoseBin_support::DEBUG_MODE_MIN() && node) {
SgAsmInstruction* instr = isSgAsmInstruction(node->get_SgNode());
if (instr) {
SgAsmFunction* funcParent = isSgAsmFunction(instr->get_parent());
if (funcParent) {
string parent = funcParent->get_name();
cout << " ---- analysis of node in function : " << parent <<
" defs " << analysis->getDefinitionSize() <<
" visited : " << RoseBin_support::ToString(visitedCounter[node]) << endl;
}
}
}
if (RoseBin_support::DEBUG_MODE())
cout << "\n evaluating: " << name << endl;
// do something with the current node
// e.g. checkVariables(name, node);
SgGraphNode* nodeBefore= NULL;
BeforeMapType::const_iterator it =
nodeBeforeMap.find(node);
if (it!=nodeBeforeMap.end())
nodeBefore = it->second;
// successor vector is empty on each new node
successors.clear();
ROSE_ASSERT(isSgIncidenceDirectedGraph(vizzGraph));
isSgIncidenceDirectedGraph(vizzGraph)->getSuccessors(node, successors);
hasChanged = analysis->run(name, node, nodeBefore);
// append the successors to the worklist
if (RoseBin_support::DEBUG_MODE())
cout << ">> getting successors (" << successors.size() << ") for : " << name << endl;
// if (successors.size()==0)
// cout << "PROBLEM ..................................................... : " << endl;
vector<SgGraphNode*>::iterator succ = successors.begin();
for (;succ!=successors.end();++succ) {
// for each successor do...
SgGraphNode* next = *succ;
SgAsmX86Instruction* nodeN = isSgAsmX86Instruction(node->get_SgNode());
//if (!nodeN) continue;
SgAsmX86Instruction* nextN = isSgAsmX86Instruction(next->get_SgNode());
//if (!nextN) continue;
string name_n = vizzGraph->getProperty(SgGraph::name, next);
bool call = false;
bool exceptionCallNext = false;
if (nextN)
exceptionCallNext = exceptionCall(nextN->get_kind() == x86_call ? nextN : 0);
bool exceptionCallNode = false;
if (nodeN)
exceptionCallNode = exceptionCall(nodeN->get_kind() == x86_call ? nodeN : 0);
if (RoseBin_support::DEBUG_MODE())
std::cout << " exceptionCallNode : " << exceptionCallNode << " exceptionCallNext : " << exceptionCallNext << endl;
// if function call is call to malloc we have an exception and follow the call path
if ((exceptionCallNode && !exceptionCallNext)) {
} else if (
//if (
(nodeN && nodeN->get_kind() == x86_call) ||
(nextN && nextN->get_kind() == x86_ret) )
call = true;
//bool sameParent = analysis->sameParents(node, next);
bool validNode=false;
if (g_algo->isValidCFGEdge(next, node) || exceptionCallNode)
validNode = true;
// debug ------------------------
if (RoseBin_support::DEBUG_MODE()) {
string nodeBeforeStr="";
if (nodeBefore) nodeBeforeStr= nodeBefore->get_name();
cout << " DEBUG : >>>>>>>> previous node " << nodeBeforeStr
<< " This node : " << name << " next node : " << name_n
<< " ** validNode : " << RoseBin_support::resBool(validNode) << endl;
}
// ----------------------------------
if (( interprocedural==false && !call) //
|| (interprocedural==true && validNode)) {
if (visited.find(next)==visited.end()) {
// if the successor is not yet visited
// mark as visited and put into worklist
if (RoseBin_support::DEBUG_MODE())
cout << " never visited next node before... " << name_n <<
" interprocedural : " << interprocedural << " call : " << call << endl;
if (RoseBin_support::DEBUG_MODE())
cout << "adding to visited : " << name_n << endl;
visited.insert(next);
nodeBeforeMap[next]=node;
visitedCounter[next]=1;
vizzGraph->setProperty(SgGraph::visitedCounter, next, RoseBin_support::ToString(1));
if (!containsHash(worklist_hash,next)) {
// add next node only if the next node
if (RoseBin_support::DEBUG_MODE())
cout << "adding to worklist: " << name_n << endl;
worklist.push_back(next);
worklist_hash.insert(next);
}
} else {
// if the successor has been visited, we need to check if it has changed
// if it has not, we continue, else we need to push it back to the worklist
int nr = visitedCounter[next];
if (RoseBin_support::DEBUG_MODE())
cout << " visited next node before... " << RoseBin_support::ToString(nr) <<
" Changed == " << RoseBin_support::resBool(hasChanged) << endl;
if (hasChanged) {
visitedCounter[next]=++nr;
vizzGraph->setProperty(SgGraph::visitedCounter, next, RoseBin_support::ToString(nr));
if (RoseBin_support::DEBUG_MODE())
cout << " has changed : " << RoseBin_support::resBool(hasChanged) <<
" -- interprocedural : " << RoseBin_support::resBool(interprocedural) <<
" -- Call : " << RoseBin_support::resBool(call) <<
" ------> new number: " << RoseBin_support::ToString(nr) <<
" -- contained in hash? : " << RoseBin_support::resBool(containsHash(worklist_hash,next)) <<
" ---- nr of Defs: " << RoseBin_support::ToString(analysis->getDefinitionSize()) <<
" ---- nr of Use: " << RoseBin_support::ToString(analysis->getUsageSize())
<< endl;
if (interprocedural || (!interprocedural && !call)){ //sameParent)) { //!call && ) {
if (!containsHash(worklist_hash,next)) {
worklist_hash.insert(next);
worklist.push_back(next);
if (RoseBin_support::DEBUG_MODE())
cout << " adding to worklist: " << name_n << endl;
}
}
} else
if (RoseBin_support::DEBUG_MODE())
cout << " has NOT changed. " << endl;
//else we continue with the next node
}
}
} // for
} // while worklist.size()>0
} // for rootNodes
}
void visit(SgNode *node) {
SgAsmX86Instruction *insn = isSgAsmX86Instruction(node);
SgAsmFunction *func = SageInterface::getEnclosingNode<SgAsmFunction>(insn);
if (func && 0==(func->get_reason() & SgAsmFunction::FUNC_LEFTOVERS))
insert(std::make_pair(insn->get_address(), insn));
}
int main(int argc, char** argv) {
std::string binaryFilename = (argc >= 1 ? argv[argc-1] : "" );
std::vector<std::string> newArgv(argv,argv+argc);
newArgv.push_back("-rose:output");
newArgv.push_back(binaryFilename+"-binarySemantics.C");
SgProject* proj = frontend(newArgv);
ROSE_ASSERT (proj);
SgSourceFile* newFile = isSgSourceFile(proj->get_fileList().front());
ROSE_ASSERT(newFile != NULL);
SgGlobal* g = newFile->get_globalScope();
ROSE_ASSERT (g);
//I am doing some experimental work to enable functions in the C representation
//Set this flag to true in order to enable that work
bool enable_functions = true;
//Jeremiah did some work to enable a simplification and normalization of the
//C representation. Enable this work by setting this flag to true.
bool enable_normalizations = false;
vector<SgNode*> asmFiles = NodeQuery::querySubTree(proj, V_SgAsmGenericFile);
ROSE_ASSERT (asmFiles.size() == 1);
if( enable_functions == false)
{
//Representation of C normalizations withotu functions
SgFunctionDeclaration* decl = buildDefiningFunctionDeclaration("run", SgTypeVoid::createType(), buildFunctionParameterList(), g);
appendStatement(decl, g);
SgBasicBlock* body = decl->get_definition()->get_body();
// ROSE_ASSERT(isSgAsmFile(asmFiles[0]));
// X86CTranslationPolicy policy(newFile, isSgAsmFile(asmFiles[0]));
X86CTranslationPolicy policy(newFile, isSgAsmGenericFile(asmFiles[0]));
ROSE_ASSERT( isSgAsmGenericFile(asmFiles[0]) != NULL);
policy.switchBody = buildBasicBlock();
removeDeadStores(policy.switchBody,policy);
SgSwitchStatement* sw = buildSwitchStatement(buildVarRefExp(policy.ipSym), policy.switchBody);
ROSE_ASSERT(isSgBasicBlock(sw->get_body()));
SgWhileStmt* whileStmt = buildWhileStmt(buildBoolValExp(true), sw);
appendStatement(whileStmt, body);
policy.whileBody = sw;
X86InstructionSemantics<X86CTranslationPolicy, WordWithExpression> t(policy);
//AS FIXME: This query gets noting in the form in the repository. Doing this hack since we only
//have one binary file anyways.
//vector<SgNode*> instructions = NodeQuery::querySubTree(asmFiles[0], V_SgAsmX86Instruction);
vector<SgNode*> instructions = NodeQuery::querySubTree(proj, V_SgAsmX86Instruction);
std::cout << "Instruction\n";
for (size_t i = 0; i < instructions.size(); ++i) {
SgAsmX86Instruction* insn = isSgAsmX86Instruction(instructions[i]);
ROSE_ASSERT (insn);
try {
t.processInstruction(insn);
} catch (const X86InstructionSemantics<X86CTranslationPolicy, WordWithExpression>::Exception &e) {
std::cout <<e.mesg <<": " <<unparseInstructionWithAddress(e.insn) <<"\n";
}
}
if ( enable_normalizations == true )
{
//Enable normalizations of C representation
//This is done heuristically where some steps
//are repeated. It is not clear which order is
//the best
{
plugInAllConstVarDefs(policy.switchBody,policy) ;
simplifyAllExpressions(policy.switchBody);
removeIfConstants(policy.switchBody);
removeDeadStores(policy.switchBody,policy);
removeUnusedVariables(policy.switchBody);
}
{
plugInAllConstVarDefs(policy.switchBody,policy) ;
simplifyAllExpressions(policy.switchBody);
removeIfConstants(policy.switchBody);
removeDeadStores(policy.switchBody,policy);
}
removeUnusedVariables(policy.switchBody);
}
}else{ //Experimental changes to introduce functions into the C representation
//When trying to add function I get that symbols are not defined
//Iterate over the functions separately
vector<SgNode*> asmFunctions = NodeQuery::querySubTree(proj, V_SgAsmFunction);
for(size_t j = 0; j < asmFunctions.size(); j++ )
{
SgAsmFunction* binFunc = isSgAsmFunction( asmFunctions[j] );
// Some functions (probably just one) are generated to hold basic blocks that could not
// be assigned to a particular function. This happens when the Disassembler is overzealous
// and the Partitioner cannot statically determine where the block belongs. The name of
// one such function is "***uncategorized blocks***". [matzke 2010-06-29]
if ((binFunc->get_reason() & SgAsmFunction::FUNC_LEFTOVERS))
continue;
//Some functions may be unnamed so we need to generate a name for those
std::string funcName;
if (binFunc->get_name().size()==0) {
char addr_str[64];
sprintf(addr_str, "0x%"PRIx64, binFunc->get_statementList()[0]->get_address());
funcName = std::string("my_") + addr_str;;
} else {
funcName = "my" + binFunc->get_name();
}
//Functions can have illegal characters in their name. Need to replace those characters
for ( int i = 0 ; i < funcName.size(); i++ )
{
char& currentCharacter = funcName.at(i);
if ( currentCharacter == '.' )
currentCharacter = '_';
}
SgFunctionDeclaration* decl = buildDefiningFunctionDeclaration(funcName, SgTypeVoid::createType(), buildFunctionParameterList(), g);
appendStatement(decl, g);
SgBasicBlock* body = decl->get_definition()->get_body();
X86CTranslationPolicy policy(newFile, isSgAsmGenericFile(asmFiles[0]));
ROSE_ASSERT( isSgAsmGenericFile(asmFiles[0]) != NULL);
policy.switchBody = buildBasicBlock();
SgSwitchStatement* sw = buildSwitchStatement(buildVarRefExp(policy.ipSym), policy.switchBody);
SgWhileStmt* whileStmt = buildWhileStmt(buildBoolValExp(true), sw);
appendStatement(whileStmt, body);
policy.whileBody = sw;
X86InstructionSemantics<X86CTranslationPolicy, WordWithExpression> t(policy);
vector<SgNode*> instructions = NodeQuery::querySubTree(binFunc, V_SgAsmX86Instruction);
for (size_t i = 0; i < instructions.size(); ++i) {
SgAsmX86Instruction* insn = isSgAsmX86Instruction(instructions[i]);
if( insn->get_kind() == x86_nop )
continue;
ROSE_ASSERT (insn);
try {
t.processInstruction(insn);
} catch (const X86InstructionSemantics<X86CTranslationPolicy, WordWithExpression>::Exception &e) {
std::cout <<e.mesg <<": " <<unparseInstructionWithAddress(e.insn) <<"\n";
}
}
}
//addDirectJumpsToSwitchCases(policy);
}
proj->get_fileList().erase(proj->get_fileList().end() - 1); // Remove binary file before calling backend
// AstTests::runAllTests(proj);
//Compile the resulting project
return backend(proj);
}
// see base class
bool
SgAsmX86Instruction::isFunctionCallSlow(const std::vector<SgAsmInstruction*>& insns, rose_addr_t *target, rose_addr_t *return_va)
{
if (isFunctionCallFast(insns, target, return_va))
return true;
// The following stuff works only if we have a relatively complete AST.
static const size_t EXECUTION_LIMIT = 10; // max size of basic blocks for expensive analyses
if (insns.empty())
return false;
SgAsmX86Instruction *last = isSgAsmX86Instruction(insns.back());
if (!last)
return false;
SgAsmFunction *func = SageInterface::getEnclosingNode<SgAsmFunction>(last);
SgAsmInterpretation *interp = SageInterface::getEnclosingNode<SgAsmInterpretation>(func);
// Slow method: Emulate the instructions and then look at the EIP and stack. If the EIP points outside the current
// function and the top of the stack holds an address of an instruction within the current function, then this must be a
// function call.
if (interp && insns.size()<=EXECUTION_LIMIT) {
using namespace Rose::BinaryAnalysis;
using namespace Rose::BinaryAnalysis::InstructionSemantics2;
using namespace Rose::BinaryAnalysis::InstructionSemantics2::SymbolicSemantics;
const InstructionMap &imap = interp->get_instruction_map();
const RegisterDictionary *regdict = RegisterDictionary::dictionary_for_isa(interp);
SmtSolverPtr solver = SmtSolver::instance(Rose::CommandLine::genericSwitchArgs.smtSolver);
BaseSemantics::RiscOperatorsPtr ops = RiscOperators::instance(regdict, solver);
ASSERT_not_null(ops);
const RegisterDescriptor SP = regdict->findLargestRegister(x86_regclass_gpr, x86_gpr_sp);
DispatcherX86Ptr dispatcher = DispatcherX86::instance(ops, SP.get_nbits());
SValuePtr orig_esp = SValue::promote(ops->readRegister(dispatcher->REG_anySP));
try {
for (size_t i=0; i<insns.size(); ++i)
dispatcher->processInstruction(insns[i]);
} catch (const BaseSemantics::Exception &e) {
return false;
}
// If the next instruction address is concrete but does not point to a function entry point, then this is not a call.
SValuePtr eip = SValue::promote(ops->readRegister(dispatcher->REG_anyIP));
if (eip->is_number()) {
rose_addr_t target_va = eip->get_number();
SgAsmFunction *target_func = SageInterface::getEnclosingNode<SgAsmFunction>(imap.get_value_or(target_va, NULL));
if (!target_func || target_va!=target_func->get_entry_va())
return false;
}
// If nothing was pushed onto the stack, then this isn't a function call.
const size_t spWidth = dispatcher->REG_anySP.get_nbits();
SValuePtr esp = SValue::promote(ops->readRegister(dispatcher->REG_anySP));
SValuePtr stack_delta = SValue::promote(ops->add(esp, ops->negate(orig_esp)));
SValuePtr stack_delta_sign = SValue::promote(ops->extract(stack_delta, spWidth-1, spWidth));
if (stack_delta_sign->is_number() && 0==stack_delta_sign->get_number())
return false;
// If the top of the stack does not contain a concrete value or the top of the stack does not point to an instruction
// in this basic block's function, then this is not a function call.
const size_t ipWidth = dispatcher->REG_anyIP.get_nbits();
SValuePtr top = SValue::promote(ops->readMemory(dispatcher->REG_SS, esp, esp->undefined_(ipWidth), esp->boolean_(true)));
if (top->is_number()) {
rose_addr_t va = top->get_number();
SgAsmFunction *return_func = SageInterface::getEnclosingNode<SgAsmFunction>(imap.get_value_or(va, NULL));
if (!return_func || return_func!=func) {
return false;
}
} else {
return false;
}
// Since EIP might point to a function entry address and since the top of the stack contains a pointer to an
// instruction in this function, we assume that this is a function call.
if (target && eip->is_number())
*target = eip->get_number();
if (return_va && top->is_number())
*return_va = top->get_number();
return true;
}
// Similar to the above method, but works when all we have is the basic block (e.g., this case gets hit quite a bit from
// the Partitioner). Returns true if, after executing the basic block, the top of the stack contains the fall-through
// address of the basic block. We depend on our caller to figure out if EIP is reasonably a function entry address.
if (!interp && insns.size()<=EXECUTION_LIMIT) {
using namespace Rose::BinaryAnalysis;
using namespace Rose::BinaryAnalysis::InstructionSemantics2;
using namespace Rose::BinaryAnalysis::InstructionSemantics2::SymbolicSemantics;
SmtSolverPtr solver = SmtSolver::instance(Rose::CommandLine::genericSwitchArgs.smtSolver);
SgAsmX86Instruction *x86insn = isSgAsmX86Instruction(insns.front());
ASSERT_not_null(x86insn);
#if 1 // [Robb P. Matzke 2015-03-03]: FIXME[Robb P. Matzke 2015-03-03]: not ready yet; x86-64 semantics still under construction
if (x86insn->get_addressSize() != x86_insnsize_32)
return false;
#endif
const RegisterDictionary *regdict = registersForInstructionSize(x86insn->get_addressSize());
const RegisterDescriptor SP = regdict->findLargestRegister(x86_regclass_gpr, x86_gpr_sp);
BaseSemantics::RiscOperatorsPtr ops = RiscOperators::instance(regdict, solver);
DispatcherX86Ptr dispatcher = DispatcherX86::instance(ops, SP.get_nbits());
try {
for (size_t i=0; i<insns.size(); ++i)
dispatcher->processInstruction(insns[i]);
} catch (const BaseSemantics::Exception &e) {
return false;
}
// Look at the top of the stack
const size_t ipWidth = dispatcher->REG_anyIP.get_nbits();
SValuePtr top = SValue::promote(ops->readMemory(dispatcher->REG_SS, ops->readRegister(SP),
ops->protoval()->undefined_(ipWidth),
ops->protoval()->boolean_(true)));
if (top->is_number() && top->get_number() == last->get_address()+last->get_size()) {
if (target) {
SValuePtr eip = SValue::promote(ops->readRegister(dispatcher->REG_anyIP));
if (eip->is_number())
*target = eip->get_number();
}
if (return_va)
*return_va = top->get_number();
return true;
}
}
return false;
}
bool
CompassAnalyses::BinaryInterruptAnalysis::Traversal::run(string& name, SgGraphNode* node,
SgGraphNode* previous){
// check known function calls and resolve variables
ROSE_ASSERT(node);
vector<uint64_t> val_rax, val_rbx, val_rcx, val_rdx ;
std::vector<uint64_t> pos_rax, pos_rbx, pos_rcx, pos_rdx;
uint64_t fpos_rax, fpos_rbx, fpos_rcx, fpos_rdx=0xffffffff;
SgAsmX86Instruction* asmNode = isSgAsmX86Instruction(node->get_SgNode());
if (asmNode) {
// cerr << " Interrupt Analysis :: checking node " << RoseBin_support::HexToString(asmNode->get_address())
// << " - " << toString(asmNode->get_kind()) << endl;
// ANALYSIS 1 : INTERRUPT DETECTION -------------------------------------------
// verify all interrupts and make sure they do what one expects them to do.
if (asmNode->get_kind() == x86_int) {
if (RoseBin_support::DEBUG_MODE())
cout << " " << name << " : found int call " << endl;
// need to resolve rax, rbx, rcx, rdx
// therefore get the definition for each
getValueForDefinition(val_rax, pos_rax, fpos_rax, node, std::make_pair(x86_regclass_gpr, x86_gpr_ax));
getValueForDefinition(val_rbx, pos_rbx, fpos_rbx, node, std::make_pair(x86_regclass_gpr, x86_gpr_bx));
getValueForDefinition(val_rcx, pos_rcx, fpos_rcx, node, std::make_pair(x86_regclass_gpr, x86_gpr_cx));
getValueForDefinition(val_rdx, pos_rdx, fpos_rdx, node, std::make_pair(x86_regclass_gpr, x86_gpr_dx));
string int_name = "unknown ";
DataTypes data_ebx = unknown;
DataTypes data_ecx = unknown;
DataTypes data_edx = unknown;
bool ambigious_inst=false;
if (val_rax.size()>1)
ambigious_inst = true;
else
if (val_rax.size()==1) {
uint64_t rax = *(val_rax.begin());
int_name = getIntCallName(rax, data_ebx, data_ecx, data_edx,
val_rbx, val_rcx, val_rdx,
pos_rbx, pos_rcx, pos_rdx,
fpos_rbx, fpos_rcx, fpos_rdx);
ambigious_inst = false;
}
if (ambigious_inst) {
string value = "";
vector<uint64_t>::iterator it = val_rax.begin();
for (;it!=val_rax.end();++it) {
string i_name = getIntCallName(*it, data_ebx, data_ecx, data_edx,
val_rbx, val_rcx, val_rdx,
pos_rbx, pos_rcx, pos_rdx,
fpos_rbx, fpos_rcx, fpos_rdx);
value +="rAX:"+RoseBin_support::HexToString(*it)+" "+i_name+" ";
// createVariable(fpos_rax, pos_rax, "rax", data_ebx, "rax", 0, val_rax,false);
}
//cerr << " DataFlow::VariableAnalysis . Ambigious INT call: " <<
// vizzGraph->getProperty(SgGraph::name, node) << " - " << value << endl;
value = "PROBLEM: " + value;
node->append_properties(SgGraph::dfa_unresolved_func,value);
} else {
// we know what INT instruction it is
string t_ebx = RoseBin_support::getTypeName(data_ebx);
string t_ecx = RoseBin_support::getTypeName(data_ecx);
string t_edx = RoseBin_support::getTypeName(data_edx);
int_name += " ("+t_ebx+","+t_ecx+","+t_edx+")";
//if (RoseBin_support::DEBUG_MODE())
// cout << " found INT call : " << value << " .. " << int_name << endl;
node->append_properties(SgGraph::dfa_variable,int_name);
}
}
}
return false;
}
void RoseBin_GMLGraph::printEdges( VirtualBinCFG::AuxiliaryInformation* info, bool forward_analysis, std::ofstream& myfile, SgDirectedGraphEdge* edge) {
// traverse edges and visualize results of graph
SgGraphNode* source = isSgGraphNode(edge->get_from());
SgGraphNode* target = isSgGraphNode(edge->get_to());
ROSE_ASSERT(source);
ROSE_ASSERT(target);
string edgeLabel="";
map < int , string> edge_p = edge->get_properties();
map < int , string>::iterator prop = edge_p.begin();
//string type = node->get_type();
for (; prop!=edge_p.end(); ++prop) {
int addr = prop->first;
// cerr << " dot : property for addr : " << addr << " and node " << hex_address << endl;
if (addr==SgGraph::edgeLabel)
edgeLabel = prop->second;
if (edgeLabel.length()>1)
if (edgeLabel[0]!='U')
edgeLabel="";
}
SgAsmStatement* binStat_s = isSgAsmStatement(source->get_SgNode());
SgAsmStatement* binStat_t = isSgAsmStatement(target->get_SgNode());
if (binStat_s==NULL || binStat_t==NULL) {
//cerr << "binStat_s==NULL || binStat_t==NULL" << endl;
} else {
map <SgAsmStatement*, int>::iterator it_s = nodesMap.find(binStat_s);
map <SgAsmStatement*, int>::iterator it_t = nodesMap.find(binStat_t);
int pos_s=0;
int pos_t=0;
if (it_s!=nodesMap.end())
pos_s = it_s->second;
if (it_t!=nodesMap.end())
pos_t = it_t->second;
if (pos_s==0 || pos_t==0) {
//cerr << " GMLGraph edge, node == 0 " << endl;
}
string output = "edge [\n label \""+edgeLabel+"\"\n source " + RoseBin_support::ToString(pos_s) +
"\n target " + RoseBin_support::ToString(pos_t) + "\n";
// ------------------
SgAsmX86Instruction* contrl = isSgAsmX86Instruction(source->get_SgNode());
string add = "";
if (contrl && x86InstructionIsControlTransfer(contrl)) {
// the source is a control transfer function
// we use either dest or dest_list
// dest is used for single destinations during cfg run
// dest_list is used for a static cfg image
vector<VirtualBinCFG::CFGEdge> outEdges = contrl->cfgBinOutEdges(info);
SgAsmX86Instruction* dest = isSgAsmX86Instruction(outEdges.empty() ? NULL : outEdges.back().target().getNode());
bool dest_list_empty = true;
if (contrl->get_kind() == x86_ret)
dest_list_empty = outEdges.empty();
SgAsmInstruction* nextNode = isSgAsmInstruction(target->get_SgNode());
ROSE_ASSERT(nextNode);
if (dest) {
//string type = "jmp_if";
if (dest==nextNode) {
if (contrl->get_kind() == x86_call || contrl->get_kind() == x86_ret) {
add += " graphics [ type \"line\" style \"dashed\" arrow \"last\" fill \"#FF0000\" ] ]\n";
} else if (contrl->get_kind() == x86_jmp) {
add += " graphics [ type \"line\" style \"dashed\" arrow \"last\" fill \"#FF0000\" ] ]\n";
} else
add += " graphics [ type \"line\" style \"dashed\" arrow \"last\" fill \"#00FF00\" ] ]\n";
} else
if (forward_analysis &&
(contrl->get_kind() == x86_call || contrl->get_kind() == x86_jmp)) {
add += " graphics [ type \"line\" arrow \"last\" fill \"#FFFF00\" ] ]\n";
}
} else
if (contrl->get_kind() == x86_ret ) { //&& dest_list_empty) {
// in case of a multiple return
add += " graphics [ type \"line\" style \"dashed\" arrow \"last\" fill \"#3399FF\" ] ]\n";
}
}
string type_n = getProperty(SgGraph::type, edge);
if (type_n==RoseBin_support::ToString(SgGraph::usage)) {
add = " graphics [ type \"line\" style \"dashed\" arrow \"last\" fill \"#000000\" ] ]\n";
}
// skip the function declaration edges for now
// bool blankOutput=false;
//if (skipFunctions)
//if (isSgAsmFunction(binStat_s))
// blankOutput=true;
if (skipInternalEdges) {
SgAsmX86Instruction* contrl = isSgAsmX86Instruction(source->get_SgNode());
if (contrl && x86InstructionIsControlTransfer(contrl) && contrl->get_kind() != x86_ret) {
if (contrl->get_kind() == x86_call)
output += " Edge_Color_ FF0000 \n Type_ \"[ 33554432 CALL_EDGE ]\" \n";
else if (contrl->get_kind() == x86_jmp)
output += " Edge_Color_ 00FF00 \n Type_ \"[ 33554432 FILECALL_EDGE ]\" \n";
else
output += " Edge_Color_ 0000FF \n ";
}
//else
// blankOutput=true;
}
if (add=="")
output += " graphics [ type \"line\" arrow \"last\" fill \"#000000\" ] ]\n";
else output +=add;
myfile << output;
}
// }
// ----------
// nodesMap.clear();
}
/* Analyze a single interpretation a block at a time */
static void
analyze_interp(SgAsmInterpretation *interp)
{
/* Get the set of all instructions except instructions that are part of left-over blocks. */
struct AllInstructions: public SgSimpleProcessing, public std::map<rose_addr_t, SgAsmX86Instruction*> {
void visit(SgNode *node) {
SgAsmX86Instruction *insn = isSgAsmX86Instruction(node);
SgAsmFunction *func = SageInterface::getEnclosingNode<SgAsmFunction>(insn);
if (func && 0==(func->get_reason() & SgAsmFunction::FUNC_LEFTOVERS))
insert(std::make_pair(insn->get_address(), insn));
}
} insns;
insns.traverse(interp, postorder);
while (!insns.empty()) {
std::cout <<"=====================================================================================\n"
<<"=== Starting a new basic block ===\n"
<<"=====================================================================================\n";
AllInstructions::iterator si = insns.begin();
SgAsmX86Instruction *insn = si->second;
insns.erase(si);
BaseSemantics::RiscOperatorsPtr operators = make_ops();
BaseSemantics::Formatter formatter;
formatter.set_suppress_initial_values();
formatter.set_show_latest_writers(do_usedef);
BaseSemantics::DispatcherPtr dispatcher;
if (do_trace) {
// Enable RiscOperators tracing, but turn off a bunch of info that makes comparisons with a known good answer
// difficult.
Sawyer::Message::PrefixPtr prefix = Sawyer::Message::Prefix::instance();
prefix->showProgramName(false);
prefix->showThreadId(false);
prefix->showElapsedTime(false);
prefix->showFacilityName(Sawyer::Message::Prefix::NEVER);
prefix->showImportance(false);
Sawyer::Message::UnformattedSinkPtr sink = Sawyer::Message::StreamSink::instance(std::cout);
sink->prefix(prefix);
sink->defaultPropertiesNS().useColor = false;
TraceSemantics::RiscOperatorsPtr trace = TraceSemantics::RiscOperators::instance(operators);
trace->stream().destination(sink);
trace->stream().enable();
dispatcher = DispatcherX86::instance(trace, 32);
} else {
dispatcher = DispatcherX86::instance(operators, 32);
}
operators->set_solver(make_solver());
// The fpstatus_top register must have a concrete value if we'll use the x86 floating-point stack (e.g., st(0))
if (const RegisterDescriptor *REG_FPSTATUS_TOP = regdict->lookup("fpstatus_top")) {
BaseSemantics::SValuePtr st_top = operators->number_(REG_FPSTATUS_TOP->get_nbits(), 0);
operators->writeRegister(*REG_FPSTATUS_TOP, st_top);
}
#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
BaseSemantics::SValuePtr orig_esp;
if (do_test_subst) {
// Only request the orig_esp if we're going to use it later because it causes an esp value to be instantiated
// in the state, which is printed in the output, and thus changes the answer.
BaseSemantics::RegisterStateGeneric::promote(operators->get_state()->get_register_state())->initialize_large();
orig_esp = operators->readRegister(*regdict->lookup("esp"));
std::cout <<"Original state:\n" <<*operators;
}
#endif
/* Perform semantic analysis for each instruction in this block. The block ends when we no longer know the value of
* the instruction pointer or the instruction pointer refers to an instruction that doesn't exist or which has already
* been processed. */
while (1) {
/* Analyze current instruction */
std::cout <<"\n" <<unparseInstructionWithAddress(insn) <<"\n";
try {
dispatcher->processInstruction(insn);
# if 0 /*DEBUGGING [Robb P. Matzke 2013-05-01]*/
show_state(operators); // for comparing RegisterStateGeneric with the old RegisterStateX86 output
# else
std::cout <<(*operators + formatter);
# endif
} catch (const BaseSemantics::Exception &e) {
std::cout <<e <<"\n";
}
/* Never follow CALL instructions */
if (insn->get_kind()==x86_call || insn->get_kind()==x86_farcall)
break;
/* Get next instruction of this block */
BaseSemantics::SValuePtr ip = operators->readRegister(dispatcher->findRegister("eip"));
if (!ip->is_number())
break;
rose_addr_t next_addr = ip->get_number();
si = insns.find(next_addr);
if (si==insns.end()) break;
insn = si->second;
insns.erase(si);
}
// Test substitution on the symbolic state.
#if SEMANTIC_DOMAIN == SYMBOLIC_DOMAIN
if (do_test_subst) {
SymbolicSemantics::SValuePtr from = SymbolicSemantics::SValue::promote(orig_esp);
BaseSemantics::SValuePtr newvar = operators->undefined_(32);
newvar->set_comment("frame_pointer");
SymbolicSemantics::SValuePtr to =
SymbolicSemantics::SValue::promote(operators->add(newvar, operators->number_(32, 4)));
std::cout <<"Substituting from " <<*from <<" to " <<*to <<"\n";
SymbolicSemantics::RiscOperators::promote(operators)->substitute(from, to);
std::cout <<"Substituted state:\n" <<(*operators+formatter);
}
#endif
}
}
bool
GraphAlgorithms::isValidCFGEdge(SgGraphNode* sgNode,
SgGraphNode* sgNodeBefore) {
if (!sgNode || !sgNodeBefore)
return false;
// bool isAUnconditionalControlTransfer = false;
bool valid = true;
bool isDirectedControlFlowEdge = false;
SgAsmX86Instruction* inst = isSgAsmX86Instruction(sgNodeBefore->get_SgNode());
SgAsmInstruction* instSgNode = isSgAsmInstruction(sgNode->get_SgNode());
SgAsmInstruction* instSgNodeBefore = isSgAsmInstruction(sgNodeBefore->get_SgNode());
if (instSgNode && instSgNodeBefore) {
if (RoseBin_support::DEBUG_MODE())
cout << " *** instSgNode && instSgNodeBefore " << endl;
SgAsmFunction* f1 = isSgAsmFunction(instSgNode->get_parent());
SgAsmFunction* f2 = isSgAsmFunction(instSgNodeBefore->get_parent());
if (f1==NULL)
f1 = isSgAsmFunction(instSgNode->get_parent()->get_parent());
if (f2==NULL)
f2 = isSgAsmFunction(instSgNodeBefore->get_parent()->get_parent());
if (f1 && f2) {
// (tps - 05/23/08) : the semantics of the previous implementation is:
// check the node before in the instruction set and check if it is the same as the previous node
// todo: the following line must be changed... the size of the current node does not give you the last node!
if (RoseBin_support::DEBUG_MODE())
cout << " *** f1 && f2 " << endl;
SgAsmInstruction* nodeBeforeInSet = NULL;
int byte = 1;
ROSE_ASSERT(info);
while (nodeBeforeInSet==NULL && byte<8) {
nodeBeforeInSet = info->getInstructionAtAddress(instSgNode->get_address() - byte);
byte++;
}
if (RoseBin_support::DEBUG_MODE())
cout << " *** nodeBeforeInSet = " << nodeBeforeInSet << " instSgNodeBefore : " << instSgNodeBefore << " byte : " << byte << endl;
if (nodeBeforeInSet == instSgNodeBefore) {
//if (!isAsmUnconditionalBranch(nodeBeforeInSet))
if (RoseBin_support::DEBUG_MODE())
cout << " isDirectedControlFlowEdge = true -- isAsmUnconditionalBranch(nodeBeforeInSet) : " << isAsmUnconditionalBranch(nodeBeforeInSet) << endl;
isDirectedControlFlowEdge = true;
}
if (RoseBin_support::DEBUG_MODE()) {
cout << " *** f1 && f2 -- isDirectionalControlFlowEdge: " << isDirectedControlFlowEdge << endl;
cout << " inst->get_kind() == x86_call : " << (inst->get_kind() == x86_call) << " inst->get_kind() == x86_ret : " << (inst->get_kind() == x86_ret) << endl;
}
if ((inst->get_kind() == x86_call || inst->get_kind() == x86_ret) && isDirectedControlFlowEdge)
valid=false;
}
}
/*
if (RoseBin_support::DEBUG_MODE()) {
cout << " ValidCFGEdge::: sgNode " << sgNode->get_name() <<
" sgNodeBefore " << sgNodeBefore->get_name() <<
" instSgNode << " << instSgNode <<
" instSgNodeBefore << " << instSgNodeBefore <<
" is Valid node ? " << RoseBin_support::resBool(valid) <<
" isControlFlowEdge " << RoseBin_support::resBool(isDirectedControlFlowEdge) << endl;
}
*/
return valid;
}
// The actual analysis, triggered when we reach the specified execution address...
virtual bool operator()(bool enabled, const Args &args) try {
using namespace rose::BinaryAnalysis::InstructionSemantics;
static const char *name = "Analysis";
using namespace rose::BinaryAnalysis::InsnSemanticsExpr;
if (enabled && args.insn->get_address()==trigger_addr) {
RTS_Message *trace = args.thread->tracing(TRACE_MISC);
trace->mesg("%s triggered: analyzing function at 0x%08"PRIx64, name, analysis_addr);
// An SMT solver is necessary for this example to work correctly. ROSE should have been configured with
// "--with-yices=/full/path/to/yices/installation". If not, you'll get a failed assertion when ROSE tries to use
// the solver.
rose::BinaryAnalysis::YicesSolver smt_solver;
smt_solver.set_linkage(rose::BinaryAnalysis::YicesSolver::LM_EXECUTABLE);
//smt_solver.set_debug(stdout);
// We deactive the simulator while we're doing this analysis. If the simulator remains activated, then the SIGCHLD
// that are generated from running the Yices executable will be sent to the specimen. That probably wouldn't cause
// problems for the specimen, but the messages are annoying.
args.thread->get_process()->get_simulator()->deactivate();
// Create the policy that holds the analysis state which is modified by each instruction. Then plug the policy
// into the X86InstructionSemantics to which we'll feed each instruction.
SymbolicSemantics::Policy<SymbolicSemantics::State, SymbolicSemantics::ValueType> policy(&smt_solver);
X86InstructionSemantics<SymbolicSemantics::Policy<SymbolicSemantics::State, SymbolicSemantics::ValueType>,
SymbolicSemantics::ValueType> semantics(policy);
// The top of the stack contains the (unknown) return address. The value above that (in memory) is the address of
// the buffer, to which we give a concrete value, and above that is the size of the buffer, which we also give a
// concrete value). The contents of the buffer are unknown. Process memory is maintained by the policy we created
// above, so none of these memory writes are actually affecting the specimen's state in the simulator.
policy.writeRegister("esp", policy.number<32>(4000));
SymbolicSemantics::ValueType<32> arg1_va = policy.add(policy.readRegister<32>("esp"), policy.number<32>(4));
SymbolicSemantics::ValueType<32> arg2_va = policy.add(arg1_va, policy.number<32>(4));
policy.writeMemory<32>(x86_segreg_ss, arg1_va, policy.number<32>(12345), policy.true_()); // ptr to buffer
policy.writeMemory<32>(x86_segreg_ss, arg2_va, policy.number<32>(2), policy.true_()); // bytes in buffer
policy.writeRegister("eip", SymbolicSemantics::ValueType<32>(analysis_addr)); // branch to analysis address
#if 1
{
// This is a kludge. If the first instruction is an indirect JMP then assume we're executing through a dynamic
// linker thunk and execute the instruction concretely to advance the instruction pointer.
SgAsmX86Instruction *insn = isSgAsmX86Instruction(args.thread->get_process()->get_instruction(analysis_addr));
if (x86_jmp==insn->get_kind()) {
PartialSymbolicSemantics::Policy<PartialSymbolicSemantics::State, PartialSymbolicSemantics::ValueType> p;
X86InstructionSemantics<PartialSymbolicSemantics::Policy<PartialSymbolicSemantics::State,
PartialSymbolicSemantics::ValueType>,
PartialSymbolicSemantics::ValueType> sem(p);
MemoryMap p_map = args.thread->get_process()->get_memory();
BOOST_FOREACH (MemoryMap::Segment &segment, p_map.segments())
segment.buffer()->copyOnWrite(true);
p.set_map(&p_map); // won't be thread safe
sem.processInstruction(insn);
policy.writeRegister("eip", SymbolicSemantics::ValueType<32>(p.readRegister<32>("eip").known_value()));
trace->mesg("%s: dynamic linker thunk kludge triggered: changed eip from 0x%08"PRIx64" to 0x%08"PRIx64,
name, analysis_addr, p.readRegister<32>("eip").known_value());
}
}
#endif
// Run the analysis until we can't figure out what instruction is next. If we set things up correctly, the
// simulation will stop when we hit the RET instruction to return from this function.
size_t nbranches = 0;
std::vector<TreeNodePtr> constraints; // path constraints for the SMT solver
while (policy.readRegister<32>("eip").is_known()) {
uint64_t va = policy.readRegister<32>("eip").known_value();
SgAsmX86Instruction *insn = isSgAsmX86Instruction(args.thread->get_process()->get_instruction(va));
assert(insn!=NULL);
trace->mesg("%s: analysing instruction %s", name, unparseInstructionWithAddress(insn).c_str());
semantics.processInstruction(insn);
if (policy.readRegister<32>("eip").is_known())
continue;
bool complete;
std::set<rose_addr_t> succs = insn->getSuccessors(&complete);
if (complete && 2==succs.size()) {
if (nbranches>=take_branch.size()) {
std::ostringstream s; s<<policy.readRegister<32>("eip");
trace->mesg("%s: EIP = %s", name, s.str().c_str());
trace->mesg("%s: analysis cannot continue; out of \"take_branch\" values", name);
throw this;
}
// Decide whether we should take the branch or not.
bool take = take_branch[nbranches++];
rose_addr_t target = 0;
for (std::set<rose_addr_t>::iterator si=succs.begin(); si!=succs.end(); ++si) {
if ((take && *si!=insn->get_address()+insn->get_size()) ||
(!take && *si==insn->get_address()+insn->get_size()))
target = *si;
}
assert(target!=0);
trace->mesg("%s: branch %staken; target=0x%08"PRIx64, name, take?"":"not ", target);
// Is this path feasible? We don't really need to check it now; we could wait until the end.
TreeNodePtr c = InternalNode::create(32, OP_EQ, policy.readRegister<32>("eip").get_expression(),
LeafNode::create_integer(32, target));
constraints.push_back(c); // shouldn't really have to do this again if we could save some state
if (rose::BinaryAnalysis::SMTSolver::SAT_YES == smt_solver.satisfiable(constraints)) {
policy.writeRegister("eip", SymbolicSemantics::ValueType<32>(target));
} else {
trace->mesg("%s: chosen control flow path is not feasible (or unknown).", name);
break;
}
}
}
// Show the value of the EAX register since this is where GCC puts the function's return value. If we did things
// right, the return value should depend only on the unknown bytes from the beginning of the buffer.
SymbolicSemantics::ValueType<32> result = policy.readRegister<32>("eax");
std::set<rose::BinaryAnalysis::InsnSemanticsExpr::LeafNodePtr> vars = result.get_expression()->get_variables();
{
std::ostringstream s;
s <<name <<": symbolic return value is " <<result <<"\n"
<<name <<": return value has " <<vars.size() <<" variables:";
for (std::set<rose::BinaryAnalysis::InsnSemanticsExpr::LeafNodePtr>::iterator vi=vars.begin();
vi!=vars.end(); ++vi)
s <<" " <<*vi;
s <<"\n";
if (!constraints.empty()) {
s <<name <<": path constraints:\n";
for (std::vector<TreeNodePtr>::iterator ci=constraints.begin(); ci!=constraints.end(); ++ci)
s <<name <<": " <<*ci <<"\n";
}
trace->mesg("%s", s.str().c_str());
}
// Now give values to those bytes and solve the equation for the result using an SMT solver.
if (!result.is_known()) {
trace->mesg("%s: setting variables (buffer bytes) to 'x' and evaluating the function symbolically...", name);
std::vector<TreeNodePtr> exprs = constraints;
LeafNodePtr result_var = LeafNode::create_variable(32);
TreeNodePtr expr = InternalNode::create(32, OP_EQ, result.get_expression(), result_var);
exprs.push_back(expr);
for (std::set<LeafNodePtr>::iterator vi=vars.begin(); vi!=vars.end(); ++vi) {
expr = InternalNode::create(32, OP_EQ, *vi, LeafNode::create_integer(32, (int)'x'));
exprs.push_back(expr);
}
if (rose::BinaryAnalysis::SMTSolver::SAT_YES == smt_solver.satisfiable(exprs)) {
LeafNodePtr result_value = smt_solver.evidence_for_variable(result_var)->isLeafNode();
if (!result_value) {
trace->mesg("%s: evaluation result could not be determined. ERROR!", name);
} else if (!result_value->is_known()) {
trace->mesg("%s: evaluation result is not constant. ERROR!", name);
} else {
trace->mesg("%s: evaluation result is 0x%08"PRIx64, name, result_value->get_value());
}
} else {
trace->mesg("%s: expression is not satisfiable. (or unknown)", name);
}
}
// Now try going the other direction. Set the return expression to a value and try to discover what two bytes
// would satisfy the equation.
if (!result.is_known()) {
trace->mesg("%s: setting result equal to 0xff015e7c and trying to find inputs...", name);
std::vector<TreeNodePtr> exprs = constraints;
TreeNodePtr expr = InternalNode::create(32, OP_EQ, result.get_expression(),
LeafNode::create_integer(32, 0xff015e7c));
exprs.push_back(expr);
if (rose::BinaryAnalysis::SMTSolver::SAT_YES == smt_solver.satisfiable(exprs)) {
for (std::set<LeafNodePtr>::iterator vi=vars.begin(); vi!=vars.end(); ++vi) {
LeafNodePtr var_val = smt_solver.evidence_for_variable(*vi)->isLeafNode();
if (var_val && var_val->is_known())
trace->mesg("%s: v%"PRIu64" = %"PRIu64" %c",
name, (*vi)->get_name(), var_val->get_value(),
isprint(var_val->get_value())?(char)var_val->get_value():' ');
}
} else {
trace->mesg("%s: expression is not satisfiable (or unknown). No solutions.", name);
}
}
// Reactivate the simulator in case we want to continue simulating.
args.thread->get_process()->get_simulator()->activate();
throw this; // Optional: will exit simulator, caught in main(), which then deactivates the simulator
}
return enabled;
} catch (const Analysis*) {
args.thread->get_process()->get_simulator()->activate();
throw;
}
