89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
/***************************************************************************************************
|
|
|
|
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;
|
|
}
|
|
|
|
/* ============================================================================================== */
|