mirror of https://github.com/x64dbg/zydis
116 lines
4.3 KiB
C
116 lines
4.3 KiB
C
/***************************************************************************************************
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Zyan Disassembler Engine (Zydis)
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Original Author : Joel Höner
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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***************************************************************************************************/
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/**
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* @file
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*
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* This file implements a tool that is supposed to be fed as input for fuzzers like AFL,
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* reading a control block from stdin, allowing the fuzzer to reach every possible
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* code-path, testing any possible combination of disassembler configurations.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <Zydis/Zydis.h>
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typedef struct ZydisFuzzControlBlock_ {
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ZydisDisassemblerMode disasMode;
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ZydisFormatterStyle formatterStyle;
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ZydisFormatterFlags formatterFlags;
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ZydisFormatterAddressFormat formatterAddrFormat;
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ZydisFormatterDisplacementFormat formatterDispFormat;
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ZydisFormatterImmediateFormat formatterImmFormat;
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} ZydisFuzzControlBlock;
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/* ============================================================================================== */
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/* Entry point */
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/* ============================================================================================== */
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int main()
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{
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ZydisFuzzControlBlock controlBlock;
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if (fread(&controlBlock, 1, sizeof(controlBlock), stdin) != sizeof(controlBlock))
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{
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fputs("not enough bytes to fuzz\n", stderr);
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return EXIT_FAILURE;
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}
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ZydisInstructionFormatter formatter;
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if (!ZYDIS_SUCCESS(ZydisFormatterInitInstructionFormatterEx(&formatter,
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controlBlock.formatterStyle, controlBlock.formatterFlags, controlBlock.formatterAddrFormat,
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controlBlock.formatterDispFormat, controlBlock.formatterImmFormat)))
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{
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fputs("failed to initialize instruction-formatter\n", stderr);
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return EXIT_FAILURE;
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}
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ZydisInstructionDecoder decoder;
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if (!ZYDIS_SUCCESS(ZydisDecoderInitInstructionDecoder(&decoder, controlBlock.disasMode)))
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{
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fputs("Failed to initialize instruction-decoder\n", stderr);
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return EXIT_FAILURE;
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}
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uint8_t readBuf[ZYDIS_MAX_INSTRUCTION_LENGTH];
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size_t numBytesRead;
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do
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{
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numBytesRead = fread(readBuf, 1, sizeof(readBuf), stdin);
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ZydisInstructionInfo info;
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ZydisStatus status;
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size_t readOffs = 0;
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while ((status = ZydisDecoderDecodeInstruction(
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&decoder, readBuf + readOffs, numBytesRead - readOffs, &info
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)) != ZYDIS_STATUS_NO_MORE_DATA)
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{
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if (!ZYDIS_SUCCESS(status))
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{
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++decoder.instructionPointer;
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++readOffs;
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continue;
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}
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char printBuffer[256];
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ZydisFormatterFormatInstruction(&formatter, &info, printBuffer, sizeof(printBuffer));
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readOffs += info.length;
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}
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if (readOffs < sizeof(readBuf))
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{
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memmove(readBuf, readBuf + readOffs, sizeof(readBuf) - readOffs);
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}
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} while (numBytesRead == sizeof(readBuf));
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return 0;
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}
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/* ============================================================================================== */
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