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/***************************************************************************************************
Zyan Disassembler Library (Zydis)
Original Author : Mappa
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
/**
* @file
*
* This file implements fuzz target for re-encoding. Fuzzer input is passed to decoder first and if
* it decodes as a valid instruction `ZydisEncoderDecodedInstructionToEncoderRequest` is used to
* create encoder request which gets passed to the encoder.
*/
#include "ZydisFuzzShared.h"
/* ============================================================================================== */
/* Enums and types */
/* ============================================================================================== */
/**
* Structure for fuzzing decoder inputs.
*/
typedef struct ZydisFuzzControlBlock_
{
ZydisMachineMode machine_mode;
ZydisStackWidth stack_width;
} ZydisFuzzControlBlock;
/* ============================================================================================== */
/* Fuzz target */
/* ============================================================================================== */
ZYAN_NO_SANITIZE("enum")
int ZydisFuzzTarget(ZydisStreamRead read_fn, void *stream_ctx)
{
ZydisFuzzControlBlock control_block;
if (read_fn(
stream_ctx, (ZyanU8 *)&control_block, sizeof(control_block)) != sizeof(control_block))
{
ZYDIS_MAYBE_FPUTS("Not enough bytes to fuzz\n", ZYAN_STDERR);
return EXIT_SUCCESS;
}
ZydisDecoder decoder;
if (!ZYAN_SUCCESS(ZydisDecoderInit(&decoder, control_block.machine_mode,
control_block.stack_width)))
{
ZYDIS_MAYBE_FPUTS("Failed to initialize decoder\n", ZYAN_STDERR);
return EXIT_FAILURE;
}
ZyanU8 buffer[32];
ZyanUSize input_len = read_fn(stream_ctx, buffer, sizeof(buffer));
ZydisDecodedInstruction insn1;
ZydisDecodedOperand operands1[ZYDIS_MAX_OPERAND_COUNT];
ZyanStatus status = ZydisDecoderDecodeFull(&decoder, buffer, input_len, &insn1, operands1);
if (!ZYAN_SUCCESS(status))
{
return EXIT_FAILURE;
}
ZydisReEncodeInstruction(&decoder, &insn1, operands1, insn1.operand_count_visible, buffer);
return EXIT_SUCCESS;
}
/* ============================================================================================== */
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