1//===- FuzzerFlags.def - Run-time flags -------------------------*- C++ -* ===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// Flags. FUZZER_FLAG_INT/FUZZER_FLAG_STRING macros should be defined at the 9// point of inclusion. We are not using any flag parsing library for better 10// portability and independence. 11//===----------------------------------------------------------------------===// 12FUZZER_FLAG_INT(verbosity, 1, "Verbosity level.") 13FUZZER_FLAG_UNSIGNED(seed, 0, "Random seed. If 0, seed is generated.") 14FUZZER_FLAG_INT(runs, -1, 15 "Number of individual test runs (-1 for infinite runs).") 16FUZZER_FLAG_INT(max_len, 0, "Maximum length of the test input. " 17 "Contents of corpus files are going to be truncated to this value. " 18 "If 0, libFuzzer tries to guess a good value based on the corpus " 19 "and reports it.") 20FUZZER_FLAG_INT(len_control, 100, "Try generating small inputs first, " 21 "then try larger inputs over time. Specifies the rate at which the length " 22 "limit is increased (smaller == faster). If 0, immediately try inputs with " 23 "size up to max_len. Default value is 0, if LLVMFuzzerCustomMutator is used.") 24FUZZER_FLAG_STRING(seed_inputs, "A comma-separated list of input files " 25 "to use as an additional seed corpus. Alternatively, an \"@\" followed by " 26 "the name of a file containing the comma-separated list.") 27FUZZER_FLAG_INT(keep_seed, 0, "If 1, keep seed inputs in the corpus even if " 28 "they do not produce new coverage. When used with |reduce_inputs==1|, the " 29 "seed inputs will never be reduced. This option can be useful when seeds are" 30 "not properly formed for the fuzz target but still have useful snippets.") 31FUZZER_FLAG_INT(cross_over, 1, "If 1, cross over inputs.") 32FUZZER_FLAG_INT(cross_over_uniform_dist, 0, "Experimental. If 1, use a " 33 "uniform probability distribution when choosing inputs to cross over with. " 34 "Some of the inputs in the corpus may never get chosen for mutation " 35 "depending on the input mutation scheduling policy. With this flag, all " 36 "inputs, regardless of the input mutation scheduling policy, can be chosen " 37 "as an input to cross over with. This can be particularly useful with " 38 "|keep_seed==1|; all the initial seed inputs, even though they do not " 39 "increase coverage because they are not properly formed, will still be " 40 "chosen as an input to cross over with.") 41 42FUZZER_FLAG_INT(mutate_depth, 5, 43 "Apply this number of consecutive mutations to each input.") 44FUZZER_FLAG_INT(reduce_depth, 0, "Experimental/internal. " 45 "Reduce depth if mutations lose unique features") 46FUZZER_FLAG_INT(shuffle, 1, "Shuffle inputs at startup") 47FUZZER_FLAG_INT(prefer_small, 1, 48 "If 1, always prefer smaller inputs during the corpus shuffle.") 49FUZZER_FLAG_INT( 50 timeout, 1200, 51 "Timeout in seconds (if positive). " 52 "If one unit runs more than this number of seconds the process will abort.") 53FUZZER_FLAG_INT(error_exitcode, 77, "When libFuzzer itself reports a bug " 54 "this exit code will be used.") 55FUZZER_FLAG_INT(timeout_exitcode, 70, "When libFuzzer reports a timeout " 56 "this exit code will be used.") 57FUZZER_FLAG_INT(max_total_time, 0, "If positive, indicates the maximal total " 58 "time in seconds to run the fuzzer.") 59FUZZER_FLAG_INT(help, 0, "Print help.") 60FUZZER_FLAG_INT(fork, 0, "Experimental mode where fuzzing happens " 61 "in a subprocess") 62FUZZER_FLAG_INT(fork_corpus_groups, 0, "For fork mode, enable the corpus-group " 63 "strategy, The main corpus will be grouped according to size, " 64 "and each sub-process will randomly select seeds from different " 65 "groups as the sub-corpus.") 66FUZZER_FLAG_INT(ignore_timeouts, 1, "Ignore timeouts in fork mode") 67FUZZER_FLAG_INT(ignore_ooms, 1, "Ignore OOMs in fork mode") 68FUZZER_FLAG_INT(ignore_crashes, 0, "Ignore crashes in fork mode") 69FUZZER_FLAG_INT(merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be " 70 "merged into the 1-st corpus. Only interesting units will be taken. " 71 "This flag can be used to minimize a corpus.") 72FUZZER_FLAG_INT(set_cover_merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be " 73 "merged into the 1-st corpus. Same as the 'merge' flag, but uses the " 74 "standard greedy algorithm for the set cover problem to " 75 "compute an approximation of the minimum set of testcases that " 76 "provide the same coverage as the initial corpora") 77FUZZER_FLAG_STRING(stop_file, "Stop fuzzing ASAP if this file exists") 78FUZZER_FLAG_STRING(merge_inner, "internal flag") 79FUZZER_FLAG_STRING(merge_control_file, 80 "Specify a control file used for the merge process. " 81 "If a merge process gets killed it tries to leave this file " 82 "in a state suitable for resuming the merge. " 83 "By default a temporary file will be used." 84 "The same file can be used for multistep merge process.") 85FUZZER_FLAG_INT(minimize_crash, 0, "If 1, minimizes the provided" 86 " crash input. Use with -runs=N or -max_total_time=N to limit " 87 "the number attempts." 88 " Use with -exact_artifact_path to specify the output." 89 " Combine with ASAN_OPTIONS=dedup_token_length=3 (or similar) to ensure that" 90 " the minimized input triggers the same crash." 91 ) 92FUZZER_FLAG_INT(cleanse_crash, 0, "If 1, tries to cleanse the provided" 93 " crash input to make it contain fewer original bytes." 94 " Use with -exact_artifact_path to specify the output." 95 ) 96FUZZER_FLAG_INT(minimize_crash_internal_step, 0, "internal flag") 97FUZZER_FLAG_STRING(features_dir, "internal flag. Used to dump feature sets on disk." 98 "Every time a new input is added to the corpus, a corresponding file in the features_dir" 99 " is created containing the unique features of that input." 100 " Features are stored in binary format.") 101FUZZER_FLAG_STRING(mutation_graph_file, "Saves a graph (in DOT format) to" 102 " mutation_graph_file. The graph contains a vertex for each input that has" 103 " unique coverage; directed edges are provided between parents and children" 104 " where the child has unique coverage, and are recorded with the type of" 105 " mutation that caused the child.") 106FUZZER_FLAG_INT(use_counters, 1, "Use coverage counters") 107FUZZER_FLAG_INT(use_memmem, 1, 108 "Use hints from intercepting memmem, strstr, etc") 109FUZZER_FLAG_INT(use_value_profile, 0, 110 "Experimental. Use value profile to guide fuzzing.") 111FUZZER_FLAG_INT(use_cmp, 1, "Use CMP traces to guide mutations") 112FUZZER_FLAG_INT(shrink, 0, "Experimental. Try to shrink corpus inputs.") 113FUZZER_FLAG_INT(reduce_inputs, 1, 114 "Try to reduce the size of inputs while preserving their full feature sets") 115FUZZER_FLAG_UNSIGNED(jobs, 0, "Number of jobs to run. If jobs >= 1 we spawn" 116 " this number of jobs in separate worker processes" 117 " with stdout/stderr redirected to fuzz-JOB.log.") 118FUZZER_FLAG_UNSIGNED(workers, 0, 119 "Number of simultaneous worker processes to run the jobs." 120 " If zero, \"min(jobs,NumberOfCpuCores()/2)\" is used.") 121FUZZER_FLAG_INT(reload, 1, 122 "Reload the main corpus every <N> seconds to get new units" 123 " discovered by other processes. If 0, disabled") 124FUZZER_FLAG_INT(report_slow_units, 10, 125 "Report slowest units if they run for more than this number of seconds.") 126FUZZER_FLAG_INT(only_ascii, 0, 127 "If 1, generate only ASCII (isprint+isspace) inputs.") 128FUZZER_FLAG_STRING(dict, "Experimental. Use the dictionary file.") 129FUZZER_FLAG_STRING(artifact_prefix, "Write fuzzing artifacts (crash, " 130 "timeout, or slow inputs) as " 131 "$(artifact_prefix)file") 132FUZZER_FLAG_STRING(exact_artifact_path, 133 "Write the single artifact on failure (crash, timeout) " 134 "as $(exact_artifact_path). This overrides -artifact_prefix " 135 "and will not use checksum in the file name. Do not " 136 "use the same path for several parallel processes.") 137FUZZER_FLAG_INT(print_pcs, 0, "If 1, print out newly covered PCs.") 138FUZZER_FLAG_INT(print_funcs, 2, "If >=1, print out at most this number of " 139 "newly covered functions.") 140FUZZER_FLAG_INT(print_final_stats, 0, "If 1, print statistics at exit.") 141FUZZER_FLAG_INT(print_corpus_stats, 0, 142 "If 1, print statistics on corpus elements at exit.") 143FUZZER_FLAG_INT(print_coverage, 0, "If 1, print coverage information as text" 144 " at exit.") 145FUZZER_FLAG_INT(print_full_coverage, 0, "If 1, print full coverage information " 146 "(all branches) as text at exit.") 147FUZZER_FLAG_INT(dump_coverage, 0, "Deprecated.") 148FUZZER_FLAG_INT(handle_segv, 1, "If 1, try to intercept SIGSEGV.") 149FUZZER_FLAG_INT(handle_bus, 1, "If 1, try to intercept SIGBUS.") 150FUZZER_FLAG_INT(handle_abrt, 1, "If 1, try to intercept SIGABRT.") 151FUZZER_FLAG_INT(handle_ill, 1, "If 1, try to intercept SIGILL.") 152FUZZER_FLAG_INT(handle_fpe, 1, "If 1, try to intercept SIGFPE.") 153FUZZER_FLAG_INT(handle_int, 1, "If 1, try to intercept SIGINT.") 154FUZZER_FLAG_INT(handle_term, 1, "If 1, try to intercept SIGTERM.") 155FUZZER_FLAG_INT(handle_xfsz, 1, "If 1, try to intercept SIGXFSZ.") 156FUZZER_FLAG_INT(handle_usr1, 1, "If 1, try to intercept SIGUSR1.") 157FUZZER_FLAG_INT(handle_usr2, 1, "If 1, try to intercept SIGUSR2.") 158FUZZER_FLAG_INT(handle_winexcept, 1, "If 1, try to intercept uncaught Windows " 159 "Visual C++ Exceptions.") 160FUZZER_FLAG_INT(close_fd_mask, 0, "If 1, close stdout at startup; " 161 "if 2, close stderr; if 3, close both. " 162 "Be careful, this will also close e.g. stderr of asan.") 163FUZZER_FLAG_INT(detect_leaks, 1, "If 1, and if LeakSanitizer is enabled " 164 "try to detect memory leaks during fuzzing (i.e. not only at shut down).") 165FUZZER_FLAG_INT(purge_allocator_interval, 1, "Purge allocator caches and " 166 "quarantines every <N> seconds. When rss_limit_mb is specified (>0), " 167 "purging starts when RSS exceeds 50% of rss_limit_mb. Pass " 168 "purge_allocator_interval=-1 to disable this functionality.") 169FUZZER_FLAG_INT(trace_malloc, 0, "If >= 1 will print all mallocs/frees. " 170 "If >= 2 will also print stack traces.") 171FUZZER_FLAG_INT(rss_limit_mb, 2048, "If non-zero, the fuzzer will exit upon " 172 "reaching this limit of RSS memory usage.") 173FUZZER_FLAG_INT(malloc_limit_mb, 0, "If non-zero, the fuzzer will exit " 174 "if the target tries to allocate this number of Mb with one malloc call. " 175 "If zero (default) same limit as rss_limit_mb is applied.") 176FUZZER_FLAG_STRING(exit_on_src_pos, "Exit if a newly found PC originates" 177 " from the given source location. Example: -exit_on_src_pos=foo.cc:123. " 178 "Used primarily for testing libFuzzer itself.") 179FUZZER_FLAG_STRING(exit_on_item, "Exit if an item with a given sha1 sum" 180 " was added to the corpus. " 181 "Used primarily for testing libFuzzer itself.") 182FUZZER_FLAG_INT(ignore_remaining_args, 0, "If 1, ignore all arguments passed " 183 "after this one. Useful for fuzzers that need to do their own " 184 "argument parsing.") 185FUZZER_FLAG_STRING(focus_function, "Experimental. " 186 "Fuzzing will focus on inputs that trigger calls to this function. " 187 "If -focus_function=auto and -data_flow_trace is used, libFuzzer " 188 "will choose the focus functions automatically. Disables -entropic when " 189 "specified.") 190FUZZER_FLAG_INT(entropic, 1, "Enables entropic power schedule.") 191FUZZER_FLAG_INT(entropic_feature_frequency_threshold, 0xFF, "Experimental. If " 192 "entropic is enabled, all features which are observed less often than " 193 "the specified value are considered as rare.") 194FUZZER_FLAG_INT(entropic_number_of_rarest_features, 100, "Experimental. If " 195 "entropic is enabled, we keep track of the frequencies only for the " 196 "Top-X least abundant features (union features that are considered as " 197 "rare).") 198FUZZER_FLAG_INT(entropic_scale_per_exec_time, 0, "Experimental. If 1, " 199 "the Entropic power schedule gets scaled based on the input execution " 200 "time. Inputs with lower execution time get scheduled more (up to 30x). " 201 "Note that, if 1, fuzzer stops from being deterministic even if a " 202 "non-zero random seed is given.") 203 204FUZZER_FLAG_INT(analyze_dict, 0, "Experimental") 205FUZZER_DEPRECATED_FLAG(use_clang_coverage) 206FUZZER_FLAG_STRING(data_flow_trace, "Experimental: use the data flow trace") 207FUZZER_FLAG_STRING(collect_data_flow, 208 "Experimental: collect the data flow trace") 209 210FUZZER_FLAG_INT(create_missing_dirs, 0, "Automatically attempt to create " 211 "directories for arguments that would normally expect them to already " 212 "exist (i.e. artifact_prefix, exact_artifact_path, features_dir, corpus)") 213