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90 lines
3.6 KiB
C
90 lines
3.6 KiB
C
/***************************************************************************************************
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Zyan Disassembler Library (Zydis)
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Original Author : Mappa
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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 fuzz target for re-encoding. Fuzzer input is passed to decoder first and if
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* it decodes as a valid instruction `ZydisEncoderDecodedInstructionToEncoderRequest` is used to
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* create encoder request which gets passed to the encoder.
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*/
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#include "ZydisFuzzShared.h"
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/* ============================================================================================== */
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/* Enums and types */
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/* ============================================================================================== */
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/**
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* Structure for fuzzing decoder inputs.
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*/
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typedef struct ZydisFuzzControlBlock_
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{
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ZydisMachineMode machine_mode;
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ZydisStackWidth stack_width;
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} ZydisFuzzControlBlock;
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/* ============================================================================================== */
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/* Fuzz target */
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/* ============================================================================================== */
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ZYAN_NO_SANITIZE("enum")
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int ZydisFuzzTarget(ZydisStreamRead read_fn, void *stream_ctx)
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{
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ZydisFuzzControlBlock control_block;
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if (read_fn(
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stream_ctx, (ZyanU8 *)&control_block, sizeof(control_block)) != sizeof(control_block))
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{
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ZYDIS_MAYBE_FPUTS("Not enough bytes to fuzz\n", ZYAN_STDERR);
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return EXIT_SUCCESS;
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}
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ZydisDecoder decoder;
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if (!ZYAN_SUCCESS(ZydisDecoderInit(&decoder, control_block.machine_mode,
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control_block.stack_width)))
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{
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ZYDIS_MAYBE_FPUTS("Failed to initialize decoder\n", ZYAN_STDERR);
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return EXIT_FAILURE;
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}
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ZyanU8 buffer[32];
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ZyanUSize input_len = read_fn(stream_ctx, buffer, sizeof(buffer));
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ZydisDecodedInstruction insn1;
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ZydisDecodedOperand operands1[ZYDIS_MAX_OPERAND_COUNT];
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ZyanStatus status = ZydisDecoderDecodeFull(&decoder, buffer, input_len, &insn1, operands1,
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ZYDIS_MAX_OPERAND_COUNT, 0);
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if (!ZYAN_SUCCESS(status))
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{
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return EXIT_FAILURE;
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}
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ZydisReEncodeInstruction(&decoder, &insn1, operands1, insn1.operand_count_visible, buffer);
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return EXIT_SUCCESS;
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}
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/* ============================================================================================== */
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