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_call_gate extends TestUnit implements Serializable {

    public static void main(String args[]) throws Exception {

        run_test(TestJMP_call_gate.class);

    }

    //--------------------------------------------------------------------------

    @Override

    public int get_test_count() throws Exception {

        return 100;

    }

    @Override

    public void init() throws Exception {

        random = new Random(15 + 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();

            /* null check, selector limit checked in: TestJMP_protected_seg

             *

             * 0 - pre-(call gate) valid check

             * 1 - cs_selector NULL

             * 2 - cs_selector out of bounds

             * 3 - cs_descriptor valid check

             * 4 - eip out of bounds

             *

             * 5 - all ok

             */

            int type = random.nextInt(6);

            DescriptorTableLayer tables = null;

            //------------------------------------------------------------------

            //------------------------------------------------------------------

            // prepare cs descriptor

            boolean is_cs_ldt = (type == 1)? false : random.nextBoolean();

            boolean conds[] = new boolean[5];

            int cond = 1 << random.nextInt(conds.length);

            if(type >= 4) cond = 0;

            int     new_cs_rpl  = 0;

            boolean new_cs_seg  = false;

            int     new_cs_type = 0;

            int     new_cs_dpl  = 0;

            boolean new_cs_p    = false;

            int     old_cs_rpl  = 0;

            do {

                new_cs_seg  = random.nextBoolean();

                new_cs_type = random.nextInt(16);

                new_cs_p    = random.nextBoolean();

                new_cs_rpl  = random.nextInt(4);

                new_cs_dpl  = random.nextInt(4);

                old_cs_rpl  = random.nextInt(4);

                conds[0] = new_cs_seg == false;

                conds[1] = ((new_cs_type >> 3) & 1) == 0; // data

                conds[2] = ((new_cs_type >> 2) & 1) == 0 && new_cs_dpl != old_cs_rpl;

                conds[3] = ((new_cs_type >> 2) & 1) == 1 && new_cs_dpl > old_cs_rpl;

                conds[4] = new_cs_p == false;

            }

            while(!isAccepted(cond, conds[0],conds[1],conds[2],conds[3],conds[4]));

System.out.printf("cond cs: %d\n", cond);

            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");

            //-------

            tables = new DescriptorTableLayer(random, prohibited_list, true);

            int index = -1;

            if(type == 1) {

                index = random.nextInt(4);

            }

            else if(type == 2) {

                index = tables.getOutOfBoundsIndex(is_cs_ldt);

                if(index == -1) continue;

            }

            else {

                index = tables.addDescriptor(is_cs_ldt, cs_desc);

                if(index == -1) continue;

            }

            if(type != 1) {

                index <<= 3;

                if(is_cs_ldt) index |= 4;

                index |= new_cs_rpl;

            }

            //--------------------------------------------------------------

            // prepare call gate descriptor

            boolean is_cg_ldt = random.nextBoolean();

            conds = new boolean[2];

            cond = 1 << random.nextInt(conds.length);

            if(type >= 1) cond = 0;

            int     new_cg_rpl  = 0;

            boolean new_cg_seg  = false;

            int     new_cg_type = 0;

            int     new_cg_dpl  = 0;

            boolean new_cg_p    = false;

            do {

                new_cg_seg  = false;

                new_cg_type = random.nextBoolean()? 0x4 : 0xc; //CALL_GATE 286,386

                new_cg_rpl  = random.nextInt(4);

                new_cg_dpl  = random.nextInt(4);

                new_cg_p    = random.nextBoolean();

                is_cg_ldt   = random.nextBoolean();

                if((cond & 1) == 1 && old_cs_rpl == 0) {

                    cond &= 0xFE;

                    cond |= 2;

                }

                conds[0] = new_cg_dpl < old_cs_rpl || new_cg_dpl < new_cg_rpl;

                conds[1] = new_cg_p == false;

            }

            while(!isAccepted(cond, conds[0],conds[1]));

            long new_cg_base  = index;

            long new_cg_limit = Layer.norm(random.nextInt(0xFFFFF+1));

            boolean new_cg_g  = random.nextBoolean();

            boolean new_cg_d_b = random.nextBoolean();

            boolean new_cg_l   = random.nextBoolean();

            boolean new_cg_avl = random.nextBoolean();

            long new_cg_limit_final = new_cg_g? new_cg_limit >> 12 : new_cg_limit;

            Descriptor cg_desc = new Descriptor((int)new_cg_base, (int)new_cg_limit_final, new_cg_type, new_cg_seg, new_cg_p, new_cg_dpl, new_cg_d_b, new_cg_g, new_cg_l, new_cg_avl);

//------------

            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);

            // eip limit

            long eip = 0;

            if(type == 4) {

                while(true) {

                    eip = new_cs_limit + 1 + random.nextInt(10);

                    if(new_cg_type == 0x4) eip &= 0xFFFF;

                    if(eip > new_cs_limit) break;

                }

                if(new_cg_type == 0x4) eip |= (random.nextInt() & 0xFFFF0000);

            }

            else {

                while(true) {

                    eip = Layer.norm(random.nextInt((int)new_cs_limit+1));

                    if(new_cg_type == 0x4) eip &= 0xFFFF;

                    if(eip <= new_cs_limit) break;

                }

                long dest = new_cs_base + eip;

                // adding always possible

                MemoryPatchLayer patch = new MemoryPatchLayer(random, prohibited_list, (int)dest, 0x0F,0x0F);

                layers.addFirst(patch);

                if(new_cg_type == 0x4) eip |= (random.nextInt() & 0xFFFF0000);

            }

            cg_desc.set_dest_offset(eip);

System.out.printf("cg_desc: ");

for(int i=0; i<8; i++) System.out.printf("%02x ", cg_desc.get_byte(i));

System.out.printf("\n");

            //----------

            index = tables.addDescriptor(is_cg_ldt, cg_desc);

            if(index == -1) continue;

            index = index << 3;

            if(is_cg_ldt) index |= 4;

            index |= new_cg_rpl;

System.out.printf("cond cg: %d\n", cond);

            layers.addFirst(tables);

            //------------------------------------------------------------------

            //------------------------------------------------------------------

            long new_eip = 0;

            long new_cs  = index;

            // 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);

    }

}