Subversion Repositories ao486

/*
 * Copyright (c) 2014, Aleksander Osman
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * 
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
package ao486.test.branch;
 
import ao486.test.TestUnit;
import ao486.test.layers.DescriptorTableLayer;
import ao486.test.layers.EffectiveAddressLayerFactory;
import ao486.test.layers.FlagsLayer;
import ao486.test.layers.GeneralRegisterLayer;
import ao486.test.layers.HandleModeChangeLayer;
import ao486.test.layers.IOLayer;
import ao486.test.layers.InstructionLayer;
import ao486.test.layers.Layer;
import ao486.test.layers.MemoryLayer;
import ao486.test.layers.MemoryPatchLayer;
import ao486.test.layers.OtherLayer;
import ao486.test.layers.Pair;
import ao486.test.layers.SegmentLayer;
import ao486.test.layers.StackLayer;
import java.io.*;
import java.util.LinkedList;
import java.util.Random;
 
 
public class TestJMP_protected_seg extends TestUnit implements Serializable {
    public static void main(String args[]) throws Exception {
        run_test(TestJMP_protected_seg.class);
    }
 
    //--------------------------------------------------------------------------
    @Override
    public int get_test_count() throws Exception {
        return 100;
    }
 
    @Override
    public void init() throws Exception {
 
        random = new Random(84 + index);
 
        String instruction;
        while(true) {
            layers.clear();
 
            LinkedList<Pair<Long, Long>> prohibited_list = new LinkedList<>();
 
            InstructionLayer instr = new InstructionLayer(random, prohibited_list);
            layers.add(instr);
            StackLayer stack = new StackLayer(random, prohibited_list);
            layers.add(stack);
            layers.add(new OtherLayer(OtherLayer.Type.PROTECTED_OR_V8086, random));
            layers.add(new FlagsLayer(FlagsLayer.Type.NOT_V8086, random));
            layers.add(new GeneralRegisterLayer(random));
            layers.add(new SegmentLayer(random));
            layers.add(new MemoryLayer(random));
            layers.add(new IOLayer(random));
            layers.addFirst(new HandleModeChangeLayer(
                    getInput("cr0_pe"),
                    getInput("vmflag"),
                    getInput("cs_rpl"),
                    getInput("cs_p"),
                    getInput("cs_s"),
                    getInput("cs_type")
            ));
 
            // instruction size
            boolean cs_d_b = getInput("cs_d_b") == 1;
 
            boolean a32 = random.nextBoolean();
            boolean o32 = random.nextBoolean();
 
 
            long new_eip = 0;
            long new_cs  = random.nextInt(4);
 
            /*
            * 0. cs_selector null
            * 1. cs_descriptor out of bounds
            * 2. valid and check_cs
            * 3. eip not in limits
            * 4. all ok
            */
 
            int test_type = random.nextInt(5);
 
            if(test_type == 0) {
                // nothing
            }
            else if(test_type == 1) {
                boolean ldtr_valid = random.nextInt(5) != 0;
 
                DescriptorTableLayer tables = new DescriptorTableLayer(random, prohibited_list, ldtr_valid);
 
                boolean is_ldt = (ldtr_valid == false)? false : random.nextBoolean();
 
                int index = tables.getOutOfBoundsIndex(is_ldt);
                if(index == -1) continue;
 
                index = index << 3;
                if(is_ldt) index |= 4;
 
                index |= random.nextInt(4);
 
                new_cs = index;
 
                layers.addFirst(tables);
            }
            else if(test_type >= 2) {
                DescriptorTableLayer tables = new DescriptorTableLayer(random, prohibited_list, true);
 
                boolean is_ldt = random.nextBoolean();
 
                boolean conds[] = new boolean[6];
                int cond = 1 << random.nextInt(conds.length);
                if(test_type >= 3) cond = 0;
 
                int     new_cs_rpl  = 0;
                int     old_cs_rpl  = 0;
                boolean new_cs_seg  = false;
                int     new_cs_type = 0;
                int     new_cs_dpl  = 0;
                boolean new_cs_p    = false;
 
                do {
                    new_cs_rpl  = random.nextInt(4);
                    old_cs_rpl  = random.nextInt(4);
                    new_cs_seg  = random.nextBoolean();
                    new_cs_type = random.nextInt(16);
                    new_cs_dpl  = random.nextInt(4);
                    new_cs_p    = random.nextBoolean();
 
                    //not valid
                    conds[0] = new_cs_seg == false && (new_cs_type == 0 || new_cs_type == 8 || new_cs_type == 10 || new_cs_type == 13);
                    //check_cs()
                    //segment always set --- new_cs_seg == false;
                    conds[1] = ((new_cs_type >> 3)&1) == 0; // is data segment
                    conds[2] = ((new_cs_type >> 3)&1) == 1 && ((new_cs_type >> 2)&1) == 0 && new_cs_dpl != old_cs_rpl; // code non conforming 1
                    conds[3] = ((new_cs_type >> 3)&1) == 1 && ((new_cs_type >> 2)&1) == 0 && new_cs_rpl > old_cs_rpl; // code non conforming 2
                    conds[4] = ((new_cs_type >> 3)&1) == 1 && ((new_cs_type >> 2)&1) == 1 && new_cs_dpl > old_cs_rpl;  // code conforming
                    conds[5] = new_cs_p == false;
                }
                while(!isAccepted(cond, conds[0],conds[1],conds[2],conds[3],conds[4],conds[5]));
 
                if(new_cs_seg == false && new_cs_type != 0 && new_cs_type != 8 && new_cs_type != 10 && new_cs_type != 13) new_cs_seg = true;
 
                long new_cs_base, new_cs_limit;
                boolean new_cs_g;
                while(true) {
                    new_cs_base = Layer.norm(random.nextInt());
                    new_cs_g    = random.nextBoolean();
 
                    new_cs_limit = random.nextInt(new_cs_g? 0xF : 0xFFFF);
                    if(new_cs_g) new_cs_limit = (new_cs_limit << 12) | 0xFFF;
 
                    if( new_cs_base + new_cs_limit < 4294967296L &&
                        Layer.collides(prohibited_list, (int)new_cs_base, (int)(new_cs_base + new_cs_limit)) == false    
                    ) break;
                }
 
                boolean new_cs_d_b = random.nextBoolean();
                boolean new_cs_l   = random.nextBoolean();
                boolean new_cs_avl = random.nextBoolean();
                long new_cs_limit_final = new_cs_g? new_cs_limit >> 12 : new_cs_limit;
                Descriptor cs_desc = new Descriptor((int)new_cs_base, (int)new_cs_limit_final, new_cs_type, new_cs_seg, new_cs_p, new_cs_dpl, new_cs_d_b, new_cs_g, new_cs_l, new_cs_avl);
 
System.out.printf("cs_desc: ");
for(int i=0; i<8; i++) System.out.printf("%02x ", cs_desc.get_byte(i));
System.out.printf("\n");
 
                final int old_cs_rpl_final = old_cs_rpl;
                Layer cs_rpl_layer = new Layer() {
                    long cs_rpl() { return old_cs_rpl_final; }
                };
                layers.addFirst(cs_rpl_layer);
 
                int index = tables.addDescriptor(is_ldt, cs_desc);
                if(index == -1) continue;
 
                index = index << 3;
                if(is_ldt) index |= 4;
 
                index |= new_cs_rpl;
 
                new_cs = index;
 
                layers.addFirst(tables);
 
System.out.printf("cond: %d\n", cond);
 
                if(test_type == 3) {
                    while(true) {
                        new_eip = new_cs_limit + 1 + random.nextInt(10);
 
                        if(o32 == false) new_eip &= 0xFFFF;
 
                        if(new_eip > new_cs_limit) break;
                    }
                    if(o32 == false) new_eip |= (random.nextInt() & 0xFFFF0000);
                }
                else if(test_type == 4) {
                    while(true) {
                        new_eip = Layer.norm(random.nextInt((int)new_cs_limit+1));
 
                        if(o32 == false) new_eip &= 0xFFFF;
 
                        if(new_eip <= new_cs_limit) break;
                    }
 
                    long dest = new_cs_base + new_eip;
                    // adding always possible
                    MemoryPatchLayer patch = new MemoryPatchLayer(random, prohibited_list, (int)dest, 0x0F,0x0F);
                    layers.addFirst(patch);
 
                    if(o32 == false) new_eip |= (random.nextInt() & 0xFFFF0000);
System.out.printf("new_cs_base: %08x, new_cs_limit: %08x\n", new_cs_base, new_cs_limit);
                }
 
            }
 
            // instruction
            byte extra_bytes[] = null;
 
            boolean is_Ep = random.nextBoolean();
 
            if(is_Ep) {
                byte modregrm_bytes[] = EffectiveAddressLayerFactory.prepare(
                        o32? (((new_cs & 0xFFFF) << 32) | (new_eip & 0xFFFFFFFF)) : (((new_cs & 0xFFFF) << 16) | (new_eip & 0xFFFF)),
                        5, EffectiveAddressLayerFactory.modregrm_reg_t.SET,
                        o32? 6 : 4, a32,
                        layers, random, this, true, false);
                extra_bytes = modregrm_bytes;
            }
            else {
                long immediate = o32? (((new_cs & 0xFFFF) << 32) | (new_eip & 0xFFFFFFFF)) : (((new_cs & 0xFFFF) << 16) | (new_eip & 0xFFFF));
 
                byte imm_bytes[] = new byte[o32? 6 : 4];
                for(int i=0; i<imm_bytes.length; i++) {
                    imm_bytes[i] = (byte)(immediate & 0xFF);
                    immediate >>= 8;
                }
                extra_bytes = imm_bytes;
            }
 
            instruction = prepare_instr(cs_d_b, a32, o32, extra_bytes, is_Ep);
            instr.add_instruction(instruction);
 
            // end condition
            break;
        }
 
        System.out.println("Instruction: [" + instruction + "]");
    }
 
    String prepare_instr(boolean cs_d_b, boolean a32, boolean o32, byte extra_bytes[], boolean is_Ep) throws Exception {
        int opcodes[] = {
            0xFF, 0xEA
        };
 
        String prefix = "";
        if(cs_d_b != o32) { prefix = "66" + prefix; }
        if(cs_d_b != a32) { prefix = "67" + prefix; }
 
        int opcode = opcodes[is_Ep? 0 : 1];
 
        byte instr[] = new byte[1 + extra_bytes.length];
        instr[0] = (byte)opcode;
        System.arraycopy(extra_bytes, 0, instr, 1, extra_bytes.length);
 
        return prefix + bytesToHex(instr);
    }
 
}