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//===- FuzzerFlags.def - Run-time flags -------------------------*- C++ -* ===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Flags. FUZZER_FLAG_INT/FUZZER_FLAG_STRING macros should be defined at the
// point of inclusion. We are not using any flag parsing library for better
// portability and independence.
FUZZER_FLAG_INT(verbosity, 1, "Verbosity level.")
FUZZER_FLAG_UNSIGNED(seed, 0, "Random seed. If 0, seed is generated.")
"Number of individual test runs (-1 for infinite runs).")
FUZZER_FLAG_INT(max_len, 0, "Maximum length of the test input. "
"If 0, libFuzzer tries to guess a good value based on the corpus "
"and reports it. ")
FUZZER_FLAG_INT(len_control, 100, "Try generating small inputs first, "
"then try larger inputs over time. Specifies the rate at which the length "
"limit is increased (smaller == faster). If 0, immediately try inputs with "
"size up to max_len. Default value is 0, if LLVMFuzzerCustomMutator is used.")
FUZZER_FLAG_STRING(seed_inputs, "A comma-separated list of input files "
"to use as an additional seed corpus. Alternatively, an \"@\" followed by "
"the name of a file containing the comma-separated list.")
FUZZER_FLAG_INT(keep_seed, 0, "If 1, keep seed inputs in the corpus even if "
"they do not produce new coverage. When used with |reduce_inputs==1|, the "
"seed inputs will never be reduced. This option can be useful when seeds are"
"not properly formed for the fuzz target but still have useful snippets.")
FUZZER_FLAG_INT(cross_over, 1, "If 1, cross over inputs.")
FUZZER_FLAG_INT(cross_over_uniform_dist, 0, "Experimental. If 1, use a "
"uniform probability distribution when choosing inputs to cross over with. "
"Some of the inputs in the corpus may never get chosen for mutation "
"depending on the input mutation scheduling policy. With this flag, all "
"inputs, regardless of the input mutation scheduling policy, can be chosen "
"as an input to cross over with. This can be particularly useful with "
"|keep_seed==1|; all the initial seed inputs, even though they do not "
"increase coverage because they are not properly formed, will still be "
"chosen as an input to cross over with.")
FUZZER_FLAG_INT(mutate_depth, 5,
"Apply this number of consecutive mutations to each input.")
FUZZER_FLAG_INT(reduce_depth, 0, "Experimental/internal. "
"Reduce depth if mutations lose unique features")
FUZZER_FLAG_INT(shuffle, 1, "Shuffle inputs at startup")
FUZZER_FLAG_INT(prefer_small, 1,
"If 1, always prefer smaller inputs during the corpus shuffle.")
timeout, 1200,
"Timeout in seconds (if positive). "
"If one unit runs more than this number of seconds the process will abort.")
FUZZER_FLAG_INT(error_exitcode, 77, "When libFuzzer itself reports a bug "
"this exit code will be used.")
FUZZER_FLAG_INT(timeout_exitcode, 70, "When libFuzzer reports a timeout "
"this exit code will be used.")
FUZZER_FLAG_INT(max_total_time, 0, "If positive, indicates the maximal total "
"time in seconds to run the fuzzer.")
FUZZER_FLAG_INT(help, 0, "Print help.")
FUZZER_FLAG_INT(fork, 0, "Experimental mode where fuzzing happens "
"in a subprocess")
FUZZER_FLAG_INT(fork_corpus_groups, 0, "For fork mode, enable the corpus-group "
"strategy, The main corpus will be grouped according to size, "
"and each sub-process will randomly select seeds from different "
"groups as the sub-corpus.")
FUZZER_FLAG_INT(ignore_timeouts, 1, "Ignore timeouts in fork mode")
FUZZER_FLAG_INT(ignore_ooms, 1, "Ignore OOMs in fork mode")
FUZZER_FLAG_INT(ignore_crashes, 0, "Ignore crashes in fork mode")
FUZZER_FLAG_INT(merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be "
"merged into the 1-st corpus. Only interesting units will be taken. "
"This flag can be used to minimize a corpus.")
FUZZER_FLAG_INT(set_cover_merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be "
"merged into the 1-st corpus. Same as the 'merge' flag, but uses the "
"standard greedy algorithm for the set cover problem to "
"compute an approximation of the minimum set of testcases that "
"provide the same coverage as the initial corpora")
FUZZER_FLAG_STRING(stop_file, "Stop fuzzing ASAP if this file exists")
FUZZER_FLAG_STRING(merge_inner, "internal flag")
"Specify a control file used for the merge process. "
"If a merge process gets killed it tries to leave this file "
"in a state suitable for resuming the merge. "
"By default a temporary file will be used."
"The same file can be used for multistep merge process.")
FUZZER_FLAG_INT(minimize_crash, 0, "If 1, minimizes the provided"
" crash input. Use with -runs=N or -max_total_time=N to limit "
"the number attempts."
" Use with -exact_artifact_path to specify the output."
" Combine with ASAN_OPTIONS=dedup_token_length=3 (or similar) to ensure that"
" the minimized input triggers the same crash."
FUZZER_FLAG_INT(cleanse_crash, 0, "If 1, tries to cleanse the provided"
" crash input to make it contain fewer original bytes."
" Use with -exact_artifact_path to specify the output."
FUZZER_FLAG_INT(minimize_crash_internal_step, 0, "internal flag")
FUZZER_FLAG_STRING(features_dir, "internal flag. Used to dump feature sets on disk."
"Every time a new input is added to the corpus, a corresponding file in the features_dir"
" is created containing the unique features of that input."
" Features are stored in binary format.")
FUZZER_FLAG_STRING(mutation_graph_file, "Saves a graph (in DOT format) to"
" mutation_graph_file. The graph contains a vertex for each input that has"
" unique coverage; directed edges are provided between parents and children"
" where the child has unique coverage, and are recorded with the type of"
" mutation that caused the child.")
FUZZER_FLAG_INT(use_counters, 1, "Use coverage counters")
FUZZER_FLAG_INT(use_memmem, 1,
"Use hints from intercepting memmem, strstr, etc")
FUZZER_FLAG_INT(use_value_profile, 0,
"Experimental. Use value profile to guide fuzzing.")
FUZZER_FLAG_INT(use_cmp, 1, "Use CMP traces to guide mutations")
FUZZER_FLAG_INT(shrink, 0, "Experimental. Try to shrink corpus inputs.")
FUZZER_FLAG_INT(reduce_inputs, 1,
"Try to reduce the size of inputs while preserving their full feature sets")
FUZZER_FLAG_UNSIGNED(jobs, 0, "Number of jobs to run. If jobs >= 1 we spawn"
" this number of jobs in separate worker processes"
" with stdout/stderr redirected to fuzz-JOB.log.")
"Number of simultaneous worker processes to run the jobs."
" If zero, \"min(jobs,NumberOfCpuCores()/2)\" is used.")
FUZZER_FLAG_INT(reload, 1,
"Reload the main corpus every <N> seconds to get new units"
" discovered by other processes. If 0, disabled")
FUZZER_FLAG_INT(report_slow_units, 10,
"Report slowest units if they run for more than this number of seconds.")
FUZZER_FLAG_INT(only_ascii, 0,
"If 1, generate only ASCII (isprint+isspace) inputs.")
FUZZER_FLAG_STRING(dict, "Experimental. Use the dictionary file.")
FUZZER_FLAG_STRING(artifact_prefix, "Write fuzzing artifacts (crash, "
"timeout, or slow inputs) as "
"Write the single artifact on failure (crash, timeout) "
"as $(exact_artifact_path). This overrides -artifact_prefix "
"and will not use checksum in the file name. Do not "
"use the same path for several parallel processes.")
FUZZER_FLAG_INT(print_pcs, 0, "If 1, print out newly covered PCs.")
FUZZER_FLAG_INT(print_funcs, 2, "If >=1, print out at most this number of "
"newly covered functions.")
FUZZER_FLAG_INT(print_final_stats, 0, "If 1, print statistics at exit.")
FUZZER_FLAG_INT(print_corpus_stats, 0,
"If 1, print statistics on corpus elements at exit.")
FUZZER_FLAG_INT(print_coverage, 0, "If 1, print coverage information as text"
" at exit.")
FUZZER_FLAG_INT(print_full_coverage, 0, "If 1, print full coverage information "
"(all branches) as text at exit.")
FUZZER_FLAG_INT(dump_coverage, 0, "Deprecated.")
FUZZER_FLAG_INT(handle_segv, 1, "If 1, try to intercept SIGSEGV.")
FUZZER_FLAG_INT(handle_bus, 1, "If 1, try to intercept SIGBUS.")
FUZZER_FLAG_INT(handle_abrt, 1, "If 1, try to intercept SIGABRT.")
FUZZER_FLAG_INT(handle_ill, 1, "If 1, try to intercept SIGILL.")
FUZZER_FLAG_INT(handle_fpe, 1, "If 1, try to intercept SIGFPE.")
FUZZER_FLAG_INT(handle_int, 1, "If 1, try to intercept SIGINT.")
FUZZER_FLAG_INT(handle_term, 1, "If 1, try to intercept SIGTERM.")
FUZZER_FLAG_INT(handle_xfsz, 1, "If 1, try to intercept SIGXFSZ.")
FUZZER_FLAG_INT(handle_usr1, 1, "If 1, try to intercept SIGUSR1.")
FUZZER_FLAG_INT(handle_usr2, 1, "If 1, try to intercept SIGUSR2.")
FUZZER_FLAG_INT(handle_winexcept, 1, "If 1, try to intercept uncaught Windows "
"Visual C++ Exceptions.")
FUZZER_FLAG_INT(close_fd_mask, 0, "If 1, close stdout at startup; "
"if 2, close stderr; if 3, close both. "
"Be careful, this will also close e.g. stderr of asan.")
FUZZER_FLAG_INT(detect_leaks, 1, "If 1, and if LeakSanitizer is enabled "
"try to detect memory leaks during fuzzing (i.e. not only at shut down).")
FUZZER_FLAG_INT(purge_allocator_interval, 1, "Purge allocator caches and "
"quarantines every <N> seconds. When rss_limit_mb is specified (>0), "
"purging starts when RSS exceeds 50% of rss_limit_mb. Pass "
"purge_allocator_interval=-1 to disable this functionality.")
FUZZER_FLAG_INT(trace_malloc, 0, "If >= 1 will print all mallocs/frees. "
"If >= 2 will also print stack traces.")
FUZZER_FLAG_INT(rss_limit_mb, 2048, "If non-zero, the fuzzer will exit upon"
"reaching this limit of RSS memory usage.")
FUZZER_FLAG_INT(malloc_limit_mb, 0, "If non-zero, the fuzzer will exit "
"if the target tries to allocate this number of Mb with one malloc call. "
"If zero (default) same limit as rss_limit_mb is applied.")
FUZZER_FLAG_STRING(exit_on_src_pos, "Exit if a newly found PC originates"
" from the given source location. Example: "
"Used primarily for testing libFuzzer itself.")
FUZZER_FLAG_STRING(exit_on_item, "Exit if an item with a given sha1 sum"
" was added to the corpus. "
"Used primarily for testing libFuzzer itself.")
FUZZER_FLAG_INT(ignore_remaining_args, 0, "If 1, ignore all arguments passed "
"after this one. Useful for fuzzers that need to do their own "
"argument parsing.")
FUZZER_FLAG_STRING(focus_function, "Experimental. "
"Fuzzing will focus on inputs that trigger calls to this function. "
"If -focus_function=auto and -data_flow_trace is used, libFuzzer "
"will choose the focus functions automatically. Disables -entropic when "
FUZZER_FLAG_INT(entropic, 1, "Enables entropic power schedule.")
FUZZER_FLAG_INT(entropic_feature_frequency_threshold, 0xFF, "Experimental. If "
"entropic is enabled, all features which are observed less often than "
"the specified value are considered as rare.")
FUZZER_FLAG_INT(entropic_number_of_rarest_features, 100, "Experimental. If "
"entropic is enabled, we keep track of the frequencies only for the "
"Top-X least abundant features (union features that are considered as "
FUZZER_FLAG_INT(entropic_scale_per_exec_time, 0, "Experimental. If 1, "
"the Entropic power schedule gets scaled based on the input execution "
"time. Inputs with lower execution time get scheduled more (up to 30x). "
"Note that, if 1, fuzzer stops from being deterministic even if a "
"non-zero random seed is given.")
FUZZER_FLAG_INT(analyze_dict, 0, "Experimental")
FUZZER_FLAG_STRING(data_flow_trace, "Experimental: use the data flow trace")
"Experimental: collect the data flow trace")
FUZZER_FLAG_INT(create_missing_dirs, 0, "Automatically attempt to create "
"directories for arguments that would normally expect them to already "
"exist (i.e. artifact_prefix, exact_artifact_path, features_dir, corpus)")