Examples of RTLExpression

Examples of org.jakstab.rtl.expressions.RTLExpression

100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
    if (expressions.length != 2) return null;
   
    // If not on trace, don't concretize
    if (isBot()) return null;

    RTLExpression condition = expressions[0];
    RTLExpression target = expressions[1];
    RTLNumber cCondition;
    RTLNumber cTarget;
   
    Set<Tuple<RTLNumber>> res = new FastSet<Tuple<RTLNumber>>();
   
    for (AbsoluteAddress successor : getNextPC()) {
      RTLNumber nextPC = successor.toNumericConstant();

      if (target instanceof RTLNumber) {
        // If target is a number, this is a direct jump, and maybe conditional

        cTarget = (RTLNumber)target;

        if (condition instanceof RTLNumber) {
          // Direct, unconditional jump
          cCondition = (RTLNumber)condition;
        } else if (target.equals(nextPC)) {
          // Conditional jump that is taken according to the trace
          cCondition = ExpressionFactory.TRUE;
        } else {
          // Conditional jump that is not taken
          cCondition = ExpressionFactory.FALSE;
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

82
83
84
85
86
87
88
89
90
91
92
93
94
    return visitor.visit(this);
  }

  @Override
  public RTLStatement evaluate(Context context) {
    RTLExpression evaldDestination = destination.evaluate(context);
    RTLExpression evaldValue = value.evaluate(context);
    RTLExpression evaldCount = count.evaluate(context);
   
    destination = evaldDestination;
    value = evaldValue;
    count = evaldCount;
   
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
      RTLNumber conditionValue = pair.get(0);
      RTLNumber targetValue = pair.get(1);
      Location nextLabel;
      // assume correct condition case
      assert conditionValue != null;
      RTLExpression assumption =
          ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
      if (conditionValue.equals(ExpressionFactory.FALSE)) {
        // assume (condition = false), and set next statement to fallthrough
        nextLabel = stmt.getNextLabel();
      } else {
        if (targetValue == null) {

          if (stmt.getType() == RTLGoto.Type.CALL) {
            // if it's a call TOP, add an unknown call edge if we're allowing unsound analysis
            RTLUnknownProcedureCall unknownCallEdge = new RTLUnknownProcedureCall(stmt);
            unknownCallEdge.setLabel(stmt.getLabel());
            unknownCallEdge.setNextLabel(stmt.getNextLabel());
            results.add(new CFAEdge(stmt.getLabel(), stmt.getNextLabel(), unknownCallEdge));
            logger.info(stmt.getLabel() + ": Cannot resolve target expression " +
                stmt.getTargetExpression() + " of call. Adding unknown call edge.");
            logger.debug("State is: " + a);
          } else {
            // if target could not be resolved, just leave the edge out for now
            logger.info(stmt.getLabel() + ": Cannot resolve target expression " +
                stmt.getTargetExpression() + ". Continuing with unsound underapproximation.");
            logger.debug("State is: " + a);
            unresolvedBranches.add(stmt.getLabel());
          }
          sound = false;

          continue;
        } else {
          // assume (condition = true AND targetExpression = targetValue)
          assumption = ExpressionFactory.createAnd(
              assumption,
              ExpressionFactory.createEqual(
                  stmt.getTargetExpression(),
                  targetValue)
          );
          // set next label to jump target
          nextLabel = new Location(new AbsoluteAddress(targetValue));
        }
      }
      assumption = assumption.evaluate(new Context());
      RTLAssume assume = new RTLAssume(assumption, stmt);
      assume.setLabel(stmt.getLabel());
      assume.setNextLabel(nextLabel);
      results.add(new CFAEdge(stmt.getLabel(), nextLabel, assume));
    }
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
      RTLNumber conditionValue = pair.get(0);
      RTLNumber targetValue = pair.get(1);
      Location nextLabel;
      // assume correct condition case
      assert conditionValue != null;
      RTLExpression assumption =
          ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
      if (conditionValue.equals(ExpressionFactory.FALSE)) {
        // assume (condition = false), and set next statement to fallthrough
        nextLabel = stmt.getNextLabel();
      } else {
        if (targetValue == null) {
          // if target could not be resolved, just leave the edge out for now
          // Can only happen here with indirect jumps
          logger.info(stmt.getLabel() + ": Cannot resolve target expression " +
              stmt.getTargetExpression() + ".");
          logger.debug("State is: " + a);
          sound = false;
          unresolvedBranches.add(stmt.getLabel());
          continue;
        } else {
          // assume (condition = true AND targetExpression = targetValue)
          assumption = ExpressionFactory.createAnd(
              assumption,
              ExpressionFactory.createEqual(
                  stmt.getTargetExpression(),
                  targetValue)
              );
          // set next label to jump target
          nextLabel = new Location(new AbsoluteAddress(targetValue));
        }
      }
      assumption = assumption.evaluate(new Context());
      RTLAssume assume = new RTLAssume(assumption, stmt);
      assume.setLabel(stmt.getLabel());
      assume.setNextLabel(nextLabel);
      results.add(new CFAEdge(assume.getLabel(), assume.getNextLabel(), assume));
    }
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
      RTLNumber conditionValue = pair.get(0);
      RTLNumber targetValue = pair.get(1);
      Location nextLabel;
      // assume correct condition case
      assert conditionValue != null;
      RTLExpression assumption =
          ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
      if (conditionValue.equals(ExpressionFactory.FALSE)) {
        // assume (condition = false), and set next statement to fallthrough
        nextLabel = stmt.getNextLabel();
      } else {
        if (targetValue == null) {
          // if target could not be resolved, just leave the edge out for now
          logger.info(stmt.getLabel() + ": Cannot resolve target expression " +
              stmt.getTargetExpression() + ". Continuing with unsound underapproximation.");
          logger.debug("State is: " + a);
          sound = false;
          unresolvedBranches.add(stmt.getLabel());
          if (Options.debug.getValue())
            throw new ControlFlowException(a, "Unresolvable control flow from " + stmt.getLabel());
          continue;
        } else {
          // assume (condition = true AND targetExpression = targetValue)
          assumption = ExpressionFactory.createAnd(
              assumption,
              ExpressionFactory.createEqual(
                  stmt.getTargetExpression(),
                  targetValue)
              );
          // set next label to jump target
          nextLabel = new Location(new AbsoluteAddress(targetValue));
        }
      }
      assumption = assumption.evaluate(new Context());
      RTLAssume assume = new RTLAssume(assumption, stmt);
      assume.setLabel(stmt.getLabel());
      assume.setNextLabel(nextLabel);
      // Target address sanity check
      if (nextLabel.getAddress().getValue() < 10L) {
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
      RTLNumber conditionValue = pair.get(0);
      RTLNumber targetValue = pair.get(1);
      Location nextLabel;
      // assume correct condition case
      assert conditionValue != null;
      RTLExpression assumption =
          ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
      if (conditionValue.equals(ExpressionFactory.FALSE)) {
        // assume (condition = false), and set next statement to fallthrough
        nextLabel = stmt.getNextLabel();
      } else {
        if (targetValue == null) {

          if (!Options.allEdges.getValue()) {
            // if target could not be resolved, just leave the edge out for now
            logger.info(stmt.getLabel() + ": Cannot resolve target expression " +
                stmt.getTargetExpression() + ". Continuing with unsound underapproximation.");
            logger.debug("State is: " + a);
            sound = false;
            unresolvedBranches.add(stmt.getLabel());
            if (Options.debug.getValue())
              throw new ControlFlowException(a, "Unresolvable control flow from " + stmt.getLabel());
            continue;
          } else {
            // Over-approximate target and add edges to all possible program locations (!)
            logger.warn(stmt.getLabel() + ": Cannot resolve target expression " +
                stmt.getTargetExpression() + ". Adding over-approximate edges to all program locations!");


            for (Iterator<AbsoluteAddress> it = Program.getProgram().codeAddressIterator(); it.hasNext();) {
              targetValue = it.next().toNumericConstant();
              assumption = ExpressionFactory.createEqual(stmt.getTargetExpression(), targetValue);
              // set next label to jump target
              nextLabel = new Location(new AbsoluteAddress(targetValue));
              RTLAssume assume = new RTLAssume(assumption, stmt);
              assume.setLabel(stmt.getLabel());
              assume.setNextLabel(nextLabel);
              results.add(new CFAEdge(assume.getLabel(), assume.getNextLabel(), assume));
            }

            continue;
          }
        } else {
          // assume (condition = true AND targetExpression = targetValue)
          assumption = ExpressionFactory.createAnd(
              assumption,
              ExpressionFactory.createEqual(
                  stmt.getTargetExpression(),
                  targetValue)
              );
          // set next label to jump target
          nextLabel = new Location(new AbsoluteAddress(targetValue));
        }
      }
      assumption = assumption.evaluate(new Context());
      RTLAssume assume = new RTLAssume(assumption, stmt);
      assume.setLabel(stmt.getLabel());
      assume.setNextLabel(nextLabel);
      // Target address sanity check
      if (nextLabel.getAddress().getValue() < 10L) {
View Full Code Here

Examples of org.jakstab.rtl.expressions.RTLExpression

121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
          RTLNumber conditionValue = pair.get(0);
          RTLNumber targetValue = pair.get(1);
          Location nextLabel;
          // Start building the assume expression: assume correct condition case
          assert conditionValue != null;
          RTLExpression assumption =
              ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
          if (conditionValue.equals(ExpressionFactory.FALSE)) {
            // assume (condition = false), and set next statement to fallthrough
            nextLabel = stmt.getNextLabel();
          } else {
            if (targetValue == null) {
              logger.debug("No value from MAY-analysis at " + stmt.getLabel());
              sound = false;
              unresolvedBranches.add(stmt.getLabel());
              continue;
            }
            // assume (condition = true AND targetExpression = targetValue)
            assumption = ExpressionFactory.createAnd(
                assumption,
                ExpressionFactory.createEqual(
                    stmt.getTargetExpression(),
                    targetValue)
                );
            // set next label to jump target
            nextLabel = new Location(new AbsoluteAddress(targetValue));
          }
          assumption = assumption.evaluate(new Context());
          RTLAssume assume = new RTLAssume(assumption, stmt);
          assume.setLabel(stmt.getLabel());
          assume.setNextLabel(nextLabel);
          // Target address sanity check
          if (nextLabel.getAddress().getValue() < 10L) {
            logger.warn("Control flow from " + stmt.getLabel() + " reaches address " + nextLabel.getAddress() + "!");
          }

          results.add(new CFAEdge(assume.getLabel(), assume.getNextLabel(), assume, Kind.MAY));
        }

        // Add all edges from under-approximation

        for (Tuple<RTLNumber> pair : dcs.projection(stmt.getCondition(), stmt.getTargetExpression())) {
          RTLNumber conditionValue = pair.get(0);
          RTLNumber targetValue = pair.get(1);
          Location nextLabel;
          // Start building the assume expression: assume correct condition case
          assert conditionValue != null;
          RTLExpression assumption =
              ExpressionFactory.createEqual(stmt.getCondition(), conditionValue);
          if (conditionValue.equals(ExpressionFactory.FALSE)) {
            // assume (condition = false), and set next statement to fallthrough
            nextLabel = stmt.getNextLabel();
          } else {
            assert targetValue != null;

            // Translate real library addresses into stub addresses. Necessary because the static analysis component
            // does not know about concrete import addresses, so it uses a stub system.
            if (!isProgramAddress(targetValue)) {
              logger.debug(dcs.getLocation() + ": Jumping out of module to " + targetValue.toHexString());

              // Attempt to map this out-of-module location to a stub
              if (realToStub.containsKey(targetValue)) {
                // If we saw this concrete address before, replace it by the known stub
                logger.debug("Replacing concrete target " + targetValue.toHexString() + " with stub to " + program.getSymbolFor(new AbsoluteAddress(realToStub.get(targetValue))));
                targetValue = realToStub.get(targetValue);
              } else {

                // Check the statically produced edges for one that is not yet mapped to a concrete address.
                // If the over-approximation resolved an import to a stub, it's going to be contained.
                boolean foundStub = false;
                for (CFAEdge e : results) {
                  RTLNumber staticTarget = e.getTarget().getAddress().toNumericConstant();
                  if (!isProgramAddress(staticTarget) && !stubToReal.containsKey(staticTarget)) {
                    // Take the first one that's neither taken nor in the program
                    // TODO: This could map the wrong addresses in some (hopefully) rare cases depending on analysis order
                    stubToReal.put(staticTarget, targetValue);
                    realToStub.put(targetValue, staticTarget);
                    targetValue = staticTarget;
                    foundStub = true;
                    break;
                  }
                }

                if (!foundStub) {
                  // If we have not found anything suitable, we need to create a new stub
                  // FIXME: The new stub will likely have incorrect stack height adjustment.
                  //        We should extract that information from the trace.

                  logger.info(dcs.getLocation() + ": Creating new stub for unknown function at " + targetValue.toHexString());
                  RTLNumber stubTarget = Program.getProgram().getProcAddress("JAK_UNKNOWN", "proc" + targetValue.toHexString()).toNumericConstant();
                  stubToReal.put(stubTarget, targetValue);
                  realToStub.put(targetValue, stubTarget);
                  targetValue = stubTarget;
                }
              }

            }

            // assume (condition = true AND targetExpression = targetValue)
            assumption = ExpressionFactory.createAnd(
                assumption,
                ExpressionFactory.createEqual(
                    stmt.getTargetExpression(),
                    targetValue)
                );
            // set next label to jump target
            nextLabel = new Location(new AbsoluteAddress(targetValue));
          }
          assumption = assumption.evaluate(new Context());
          RTLAssume assume = new RTLAssume(assumption, stmt);
          assume.setLabel(stmt.getLabel());
          assume.setNextLabel(nextLabel);

          results.add(new CFAEdge(assume.getLabel(), assume.getNextLabel(), assume, Kind.MUST));
View Full Code Here
TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.