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Tests: Add fuzz_decode_alone OSS-Fuzz target

This fuzz target that handles LZMA alone decoding. A new fuzz
dictionary .dict was also created with common LZMA header values to
help speed up the discovery of valid headers.
This commit is contained in:
Maksym Vatsyk 2023-12-04 17:23:24 +01:00 committed by Jia Tan
parent 37581a77ad
commit 7ca8c9869d
3 changed files with 66 additions and 0 deletions

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[libfuzzer]
max_len = 4096
dict = fuzz_lzma.dict

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# first 5 header bytes of .lzma archives based on the info from
# https://github.com/tukaani-project/xz/blob/master/doc/lzma-file-format.txt
# byte 0 value (properties=0x5d) is created by encoding
# common values (lc=3, lp=0, pb=2) using the algorithm,
# described in the documentation above
# compression preset 1 (dictionary size = 0x00100000)
"\x5d\x00\x00\x10\x00"
# compression preset 2 (dictionary size = 0x00200000)
"\x5d\x00\x00\x20\x00"
# compression preset 3, 4 (dictionary size = 0x00400000)
"\x5d\x00\x00\x40\x00"
# compression preset 5, 6 (dictionary size = 0x00800000)
"\x5d\x00\x00\x80\x00"
# compression preset 7 (dictionary size = 0x01000000)
"\x5d\x00\x00\x00\x01"
# compression preset 8 (dictionary size = 0x02000000)
"\x5d\x00\x00\x00\x02"
# compression preset 9 (dictionary size = 0x04000000)
"\x5d\x00\x00\x00\x04"

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///////////////////////////////////////////////////////////////////////////////
//
/// \file fuzz_decode_auto.c
/// \brief Fuzz test program for liblzma lzma_auto_decoder()
//
// Author: Maksym Vatsyk
//
// Based on Lasse Collin's original fuzzer for liblzma
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include "lzma.h"
#include "fuzz_common.h"
extern int
LLVMFuzzerTestOneInput(const uint8_t *inbuf, size_t inbuf_size)
{
lzma_stream strm = LZMA_STREAM_INIT;
// Initialize a LZMA alone decoder using the memory usage limit
// defined in fuzz_common.h
if (lzma_alone_decoder(&strm, MEM_LIMIT) != LZMA_OK) {
// This should never happen unless the system has
// no free memory or address space to allow the small
// allocations that the initialization requires.
fprintf(stderr, "lzma_alone_decoder() failed\n");
abort();
}
fuzz_code(&strm, inbuf, inbuf_size);
// Free the allocated memory.
lzma_end(&strm);
return 0;
}