zydis/tools/ZydisFuzzIn.c

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/***************************************************************************************************
Zyan Disassembler Engine (Zydis)
Original Author : Joel Höner
* 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.
***************************************************************************************************/
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/**
* @file
*
* This file implements a tool that is supposed to be fed as input for fuzzers like AFL,
* reading a control block from stdin, allowing the fuzzer to reach every possible
* code-path, testing any possible combination of disassembler configurations.
*/
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <Zydis/Zydis.h>
typedef struct ZydisFuzzControlBlock_ {
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ZydisDisassemblerMode disasMode;
ZydisDecoderFlags decoderFlags;
ZydisFormatterStyle formatterStyle;
ZydisFormatterFlags formatterFlags;
uint8_t bufSize;
} ZydisFuzzControlBlock;
/* ============================================================================================== */
/* Entry point */
/* ============================================================================================== */
int main()
{
ZydisFuzzControlBlock controlBlock;
if (fread(&controlBlock, 1, sizeof(controlBlock), stdin) != sizeof(controlBlock))
{
fputs("not enough bytes to fuzz\n", stderr);
return EXIT_FAILURE;
}
ZydisFileInput input;
if (!ZYDIS_SUCCESS(ZydisInputInitFileInput(&input, stdin)))
{
fputs("failed to initialize file-input\n", stderr);
return EXIT_FAILURE;
}
ZydisInstructionFormatter formatter;
if (!ZYDIS_SUCCESS(ZydisFormatterInitInstructionFormatterEx(&formatter,
controlBlock.formatterStyle, controlBlock.formatterFlags)))
{
fputs("failed to initialized instruction-formatter\n", stderr);
return EXIT_FAILURE;
}
ZydisInstructionDecoder decoder;
if (!ZYDIS_SUCCESS(ZydisDecoderInitInstructionDecoderEx(&decoder, controlBlock.disasMode,
(ZydisCustomInput*)&input, controlBlock.decoderFlags)))
{
fputs("Failed to initialize instruction-decoder\n", stderr);
return EXIT_FAILURE;
}
ZydisInstructionInfo info;
char *outBuf = malloc(controlBlock.bufSize);
while (ZYDIS_SUCCESS(ZydisDecoderDecodeNextInstruction(&decoder, &info)))
{
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if (info.instrFlags & ZYDIS_INSTRFLAG_ERROR_MASK)
{
printf("db %02X\n", info.data[0]);
continue;
}
ZydisFormatterFormatInstruction(&formatter, &info, outBuf, controlBlock.bufSize);
puts(outBuf);
}
free(outBuf);
return 0;
}
/* ============================================================================================== */