From 307aded670c6a32620e45c16d2d7e447dda1b061 Mon Sep 17 00:00:00 2001 From: Douglas Bagnall Date: Thu, 17 Nov 2022 16:09:26 +1300 Subject: fuzz: add fuzz_lzxpress_huffman_compress This differs from fuzz_lzxpress_huffman_round_trip (next commit) in that the output buffer might be too small for the compressed data, in which case we want to see an error and not a crash. Signed-off-by: Douglas Bagnall Reviewed-by: Joseph Sutton --- lib/fuzzing/fuzz_lzxpress_huffman_compress.c | 58 ++++++++++++++++++++++++++++ lib/fuzzing/wscript_build | 5 +++ 2 files changed, 63 insertions(+) create mode 100644 lib/fuzzing/fuzz_lzxpress_huffman_compress.c diff --git a/lib/fuzzing/fuzz_lzxpress_huffman_compress.c b/lib/fuzzing/fuzz_lzxpress_huffman_compress.c new file mode 100644 index 00000000000..d92131d3a8b --- /dev/null +++ b/lib/fuzzing/fuzz_lzxpress_huffman_compress.c @@ -0,0 +1,58 @@ +/* + Fuzzing for lzxpress_huffman_compress_talloc + Copyright (C) Michael Hanselmann 2019 + Copyright (C) Douglas Bagnall 2022 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +*/ + +#include "includes.h" +#include "fuzzing/fuzzing.h" +#include "compression/lzxpress_huffman.h" + +int LLVMFuzzerInitialize(int *argc, char ***argv) +{ + return 0; +} + + +#define MAX_SIZE (1024 * 1024) + +int LLVMFuzzerTestOneInput(uint8_t *buf, size_t len) +{ + static uint8_t *output; + size_t output_len; + TALLOC_CTX *mem_ctx = NULL; + struct lzxhuff_compressor_mem cmp_mem; + + /* + * The round-trip fuzzer checks the compressor with an unconstrained + * output buffer; here we see what happens if the buffer is possibly too + * small. + */ + if (len < 3) { + return 0; + } + output_len = MIN(MAX_SIZE, buf[0] | (buf[1] << 8) | (buf[2] << 16)); + buf += 3; + len -= 3; + mem_ctx = talloc_new(NULL); + + output = talloc_array(mem_ctx, uint8_t, output_len); + + lzxpress_huffman_compress(&cmp_mem, buf, len, output, output_len); + + talloc_free(mem_ctx); + return 0; +} diff --git a/lib/fuzzing/wscript_build b/lib/fuzzing/wscript_build index 600c827e31e..fe64cec6c4e 100644 --- a/lib/fuzzing/wscript_build +++ b/lib/fuzzing/wscript_build @@ -62,6 +62,11 @@ bld.SAMBA_BINARY('fuzz_lzxpress_huffman_decompress', deps='fuzzing LZXPRESS afl-fuzz-main', fuzzer=True) +bld.SAMBA_BINARY('fuzz_lzxpress_huffman_compress', + source='fuzz_lzxpress_huffman_compress.c', + deps='fuzzing LZXPRESS afl-fuzz-main', + fuzzer=True) + bld.SAMBA_BINARY('fuzz_ldap_decode', source='fuzz_ldap_decode.c', deps='fuzzing cli-ldap afl-fuzz-main', -- cgit v1.2.1