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diff --git a/docs/Changelog.md b/docs/Changelog.md new file mode 100644 index 00000000..f2c39e65 --- /dev/null +++ b/docs/Changelog.md @@ -0,0 +1,2422 @@ +# Changelog + + This is the list of all noteworthy changes made in every public release of + the tool. See README for the general instruction manual. + +## Staying informed + +Want to stay in the loop on major new features? Join our mailing list by +sending a mail to <afl-users+subscribe@googlegroups.com>. + + +### Version ++2.60d (develop): + + - use -march=native if available + - afl-fuzz: + - now prints the real python version support compiled in + - set stronger performance compile options and little tweaks + - Android: prefer bigcores when selecting a CPU + - CmpLog forkserver + - Redqueen input-2-state mutator (cmp instructions only ATM) + - all Python 2+3 versions supported now + - afl-clang-fast: + - show in the help output for which llvm version it was compiled for + - now does not need to be recompiled between trace-pc and pass + instrumentation. compile normally and set AFL_LLVM_USE_TRACE_PC :) + - LLVM 11 is supported + - CmpLog instrumentation using SanCov (see llvm_mode/README.cmplog) + - qemu_mode: + - CmpLog instrumentation for QEMU (-c afl-fuzz command line option) + - AFL_PERSISTENT_HOOK callback module for persistent QEMU + (see examples/qemu_persistent_hook) + - added qemu_mode/README.persistent.md documentation + - afl-cmin is now a sh script (invoking awk) instead of bash for portability + the original script is still present as afl-cmin.bash + - afl-showmap: -i dir option now allows processing multiple inputs using the + forkserver. This is for enhanced speed in afl-cmin. + - added blacklist and whitelisting function check in all modules of llvm_mode + - added fix from Debian project to compile libdislocator and libtokencap + - libdislocator: AFL_ALIGNED_ALLOC to force size alignment to max_align_t + + +### Version ++2.60c (release): + + - fixed a critical bug in afl-tmin that was introduced during ++2.53d + - added test cases for afl-cmin and afl-tmin to test/test.sh + - added ./examples/argv_fuzzing ld_preload library by Kjell Braden + - added preeny's desock_dup ld_preload library as + ./examples/socket_fuzzing for network fuzzing + - added AFL_AS_FORCE_INSTRUMENT environment variable for afl-as - this is + for the retrorewrite project + - we now set QEMU_SET_ENV from AFL_PRELOAD when qemu_mode is used + + +### Version ++2.59c (release): + + - qbdi_mode: fuzz android native libraries via QBDI framework + - unicorn_mode: switched to the new unicornafl, thanks domenukk + (see https://github.com/vanhauser-thc/unicorn) + - afl-fuzz: + - added radamsa as (an optional) mutator stage (-R[R]) + - added -u command line option to not unlink the fuzz input file + - Python3 support (autodetect) + - AFL_DISABLE_TRIM env var to disable the trim stage + - CPU affinity support for DragonFly + - llvm_mode: + - float splitting is now configured via AFL_LLVM_LAF_SPLIT_FLOATS + - support for llvm 10 included now (thanks to devnexen) + - libtokencap: + - support for *BSD/OSX/Dragonfly added + - hook common *cmp functions from widely used libraries + - compcov: + - hook common *cmp functions from widely used libraries + - floating point splitting support for QEMU on x86 targets + - qemu_mode: AFL_QEMU_DISABLE_CACHE env to disable QEMU TranslationBlocks caching + - afl-analyze: added AFL_SKIP_BIN_CHECK support + - better random numbers for gcc_plugin and llvm_mode (thanks to devnexen) + - Dockerfile by courtesy of devnexen + - added regex.dictionary + - qemu and unicorn download scripts now try to download until the full + download succeeded. f*ckin travis fails downloading 40% of the time! + - more support for Android (please test!) + - added the few Android stuff we didnt have already from Google afl repository + - removed unnecessary warnings + + +### Version ++2.58c (release): + + - reverted patch to not unlink and recreate the input file, it resulted in + performance loss of ~10% + - added test/test-performance.sh script + - (re)added gcc_plugin, fast inline instrumentation is not yet finished, + however it includes the whitelisting and persistance feature! by hexcoder- + - gcc_plugin tests added to testing framework + + +### Version ++2.54d-2.57c (release): + + - we jump to 2.57 instead of 2.55 to catch up with Google's versioning + - persistent mode for QEMU (see qemu_mode/README.md) + - custom mutator library is now an additional mutator, to exclusivly use it + add AFL_CUSTOM_MUTATOR_ONLY (that will trigger the previous behaviour) + - new library qemu_mode/unsigaction which filters sigaction events + - afl-fuzz: new command line option -I to execute a command on a new crash + - no more unlinking the input file, this way the input file can also be a + FIFO or disk partition + - setting LLVM_CONFIG for llvm_mode will now again switch to the selected + llvm version. If your setup is correct. + - fuzzing strategy yields for custom mutator were missing from the UI, added them :) + - added "make tests" which will perform checks to see that all functionality + is working as expected. this is currently the starting point, its not complete :) + - added mutation documentation feature ("make document"), creates afl-fuzz-document + and saves all mutations of the first run on the first file into out/queue/mutations + - libtokencap and libdislocator now compile to the afl_root directory and are + installed to the .../lib/afl directory when present during make install + - more BSD support, e.g. free CPU binding code for FreeBSD (thanks to devnexen) + - reducing duplicate code in afl-fuzz + - added "make help" + - removed compile warnings from python internal stuff + - added man page for afl-clang-fast[++] + - updated documentation + - Wine mode to run Win32 binaries with the QEMU instrumentation (-W) + - CompareCoverage for ARM target in QEMU/Unicorn + - laf-intel in llvm_mode now also handles floating point comparisons + + +### Version ++2.54c (release): + + - big code refactoring: + * all includes are now in include/ + * all afl sources are now in src/ - see src/README.src + * afl-fuzz was splitted up in various individual files for including + functionality in other programs (e.g. forkserver, memory map, etc.) + for better readability. + * new code indention everywhere + - auto-generating man pages for all (main) tools + - added AFL_FORCE_UI to show the UI even if the terminal is not detected + - llvm 9 is now supported (still needs testing) + - Android is now supported (thank to JoeyJiao!) - still need to modify the Makefile though + - fix building qemu on some Ubuntus (thanks to floyd!) + - custom mutator by a loaded library is now supported (thanks to kyakdan!) + - added PR that includes peak_rss_mb and slowest_exec_ms in the fuzzer_stats report + - more support for *BSD (thanks to devnexen!) + - fix building on *BSD (thanks to tobias.kortkamp for the patch) + - fix for a few features to support different map sized than 2^16 + - afl-showmap: new option -r now shows the real values in the buckets (stock + afl never did), plus shows tuple content summary information now + - small docu updates + - NeverZero counters for QEMU + - NeverZero counters for Unicorn + - CompareCoverage Unicorn + - immediates-only instrumentation for CompareCoverage + + +### Version ++2.53c (release): + + - README is now README.md + - imported the few minor changes from the 2.53b release + - unicorn_mode got added - thanks to domenukk for the patch! + - fix llvm_mode AFL_TRACE_PC with modern llvm + - fix a crash in qemu_mode which also exists in stock afl + - added libcompcov, a laf-intel implementation for qemu! :) + see qemu_mode/libcompcov/README.libcompcov + - afl-fuzz now displays the selected core in the status screen (blue {#}) + - updated afl-fuzz and afl-system-config for new scaling governor location + in modern kernels + - using the old ineffective afl-gcc will now show a deprecation warning + - all queue, hang and crash files now have their discovery time in their name + - if llvm_mode was compiled, afl-clang/afl-clang++ will point to these + instead of afl-gcc + - added instrim, a much faster llvm_mode instrumentation at the cost of + path discovery. See llvm_mode/README.instrim (https://github.com/csienslab/instrim) + - added MOpt (github.com/puppet-meteor/MOpt-AFL) mode, see docs/README.MOpt + - added code to make it more portable to other platforms than Intel Linux + - added never zero counters for afl-gcc and optionally (because of an + optimization issue in llvm < 9) for llvm_mode (AFL_LLVM_NEVER_ZERO=1) + - added a new doc about binary only fuzzing: docs/binaryonly_fuzzing.txt + - more cpu power for afl-system-config + - added forkserver patch to afl-tmin, makes it much faster (originally from + github.com/nccgroup/TriforceAFL) + - added whitelist support for llvm_mode via AFL_LLVM_WHITELIST to allow + only to instrument what is actually interesting. Gives more speed and less + map pollution (originally by choller@mozilla) + - added Python Module mutator support, python2.7-dev is autodetected. + see docs/python_mutators.txt (originally by choller@mozilla) + - added AFL_CAL_FAST for slow applications and AFL_DEBUG_CHILD_OUTPUT for + debugging + - added -V time and -E execs option to better comparison runs, runs afl-fuzz + for a specific time/executions. + - added a -s seed switch to allow afl run with a fixed initial + seed that is not updated. This is good for performance and path discovery + tests as the random numbers are deterministic then + - llvm_mode LAF_... env variables can now be specified as AFL_LLVM_LAF_... + that is longer but in line with other llvm specific env vars + + +### Version ++2.52c (2019-06-05): + + - Applied community patches. See docs/PATCHES for the full list. + LLVM and Qemu modes are now faster. + Important changes: + afl-fuzz: -e EXTENSION commandline option + llvm_mode: LAF-intel performance (needs activation, see llvm/README.laf-intel) + a few new environment variables for afl-fuzz, llvm and qemu, see docs/env_variables.txt + - Added the power schedules of AFLfast by Marcel Boehme, but set the default + to the AFL schedule, not to the FAST schedule. So nothing changes unless + you use the new -p option :-) - see docs/power_schedules.txt + - added afl-system-config script to set all system performance options for fuzzing + - llvm_mode works with llvm 3.9 up to including 8 ! + - qemu_mode got upgraded from 2.1 to 3.1 - incorporated from + https://github.com/andreafioraldi/afl and with community patches added + + +### Version 2.52b (2017-11-04): + + - Upgraded QEMU patches from 2.3.0 to 2.10.0. Required troubleshooting + several weird issues. All the legwork done by Andrew Griffiths. + + - Added setsid to afl-showmap. See the notes for 2.51b. + + - Added target mode (deferred, persistent, qemu, etc) to fuzzer_stats. + Requested by Jakub Wilk. + + - afl-tmin should now save a partially minimized file when Ctrl-C + is pressed. Suggested by Jakub Wilk. + + - Added an option for afl-analyze to dump offsets in hex. Suggested by + Jakub Wilk. + + - Added support for parameters in triage_crashes.sh. Patch by Adam of + DC949. + +### Version 2.51b (2017-08-30): + + - Made afl-tmin call setsid to prevent glibc traceback junk from showing + up on the terminal in some distros. Suggested by Jakub Wilk. + +### Version 2.50b (2017-08-19): + + - Fixed an interesting timing corner case spotted by Jakub Wilk. + + - Addressed a libtokencap / pthreads incompatibility issue. Likewise, spotted + by Jakub Wilk. + + - Added a mention of afl-kit and Pythia. + + - Added AFL_FAST_CAL. + + - In-place resume now preserves .synced. Suggested by Jakub Wilk. + +### Version 2.49b (2017-07-18): + + - Added AFL_TMIN_EXACT to allow path constraint for crash minimization. + + - Added dates for releases (retroactively for all of 2017). + +### Version 2.48b (2017-07-17): + + - Added AFL_ALLOW_TMP to permit some scripts to run in /tmp. + + - Fixed cwd handling in afl-analyze (similar to the quirk in afl-tmin). + + - Made it possible to point -o and -f to the same file in afl-tmin. + +### Version 2.47b (2017-07-14): + + - Fixed cwd handling in afl-tmin. Spotted by Jakub Wilk. + +### Version 2.46b (2017-07-10): + + - libdislocator now supports AFL_LD_NO_CALLOC_OVER for folks who do not + want to abort on calloc() overflows. + + - Made a minor fix to libtokencap. Reported by Daniel Stender. + + - Added a small JSON dictionary, inspired on a dictionary done by Jakub Wilk. + +### Version 2.45b (2017-07-04): + + - Added strstr, strcasestr support to libtokencap. Contributed by + Daniel Hodson. + + - Fixed a resumption offset glitch spotted by Jakub Wilk. + + - There are definitely no bugs in afl-showmap -c now. + +### Version 2.44b (2017-06-28): + + - Added a visual indicator of ASAN / MSAN mode when compiling. Requested + by Jakub Wilk. + + - Added support for afl-showmap coredumps (-c). Suggested by Jakub Wilk. + + - Added LD_BIND_NOW=1 for afl-showmap by default. Although not really useful, + it reportedly helps reproduce some crashes. Suggested by Jakub Wilk. + + - Added a note about allocator_may_return_null=1 not always working with + ASAN. Spotted by Jakub Wilk. + +### Version 2.43b (2017-06-16): + + - Added AFL_NO_ARITH to aid in the fuzzing of text-based formats. + Requested by Jakub Wilk. + +### Version 2.42b (2017-06-02): + + - Renamed the R() macro to avoid a problem with llvm_mode in the latest + versions of LLVM. Fix suggested by Christian Holler. + +### Version 2.41b (2017-04-12): + + - Addressed a major user complaint related to timeout detection. Timing out + inputs are now binned as "hangs" only if they exceed a far more generous + time limit than the one used to reject slow paths. + +### Version 2.40b (2017-04-02): + + - Fixed a minor oversight in the insertion strategy for dictionary words. + Spotted by Andrzej Jackowski. + + - Made a small improvement to the havoc block insertion strategy. + + - Adjusted color rules for "is it done yet?" indicators. + +### Version 2.39b (2017-02-02): + + - Improved error reporting in afl-cmin. Suggested by floyd. + + - Made a minor tweak to trace-pc-guard support. Suggested by kcc. + + - Added a mention of afl-monitor. + +### Version 2.38b (2017-01-22): + + - Added -mllvm -sanitizer-coverage-block-threshold=0 to trace-pc-guard + mode, as suggested by Kostya Serebryany. + +### Version 2.37b (2017-01-22): + + - Fixed a typo. Spotted by Jakub Wilk. + + - Fixed support for make install when using trace-pc. Spotted by + Kurt Roeckx. + + - Switched trace-pc to trace-pc-guard, which should be considerably + faster and is less quirky. Kudos to Konstantin Serebryany (and sorry + for dragging my feet). + + Note that for some reason, this mode doesn't perform as well as + "vanilla" afl-clang-fast / afl-clang. + +### Version 2.36b (2017-01-14): + + - Fixed a cosmetic bad free() bug when aborting -S sessions. Spotted + by Johannes S. + + - Made a small change to afl-whatsup to sort fuzzers by name. + + - Fixed a minor issue with malloc(0) in libdislocator. Spotted by + Rene Freingruber. + + - Changed the clobber pattern in libdislocator to a slightly more + reliable one. Suggested by Rene Freingruber. + + - Added a note about THP performance. Suggested by Sergey Davidoff. + + - Added a somewhat unofficial support for running afl-tmin with a + baseline "mask" that causes it to minimize only for edges that + are unique to the input file, but not to the "boring" baseline. + Suggested by Sami Liedes. + + - "Fixed" a getPassName() problem with newer versions of clang. + Reported by Craig Young and several other folks. + + Yep, I know I have a backlog on several other feature requests. + Stay tuned! + +### Version 2.35b: + + - Fixed a minor cmdline reporting glitch, spotted by Leo Barnes. + + - Fixed a silly bug in libdislocator. Spotted by Johannes Schultz. + +### Version 2.34b: + + - Added a note about afl-tmin to technical_details.txt. + + - Added support for AFL_NO_UI, as suggested by Leo Barnes. + +### Version 2.33b: + + - Added code to strip -Wl,-z,defs and -Wl,--no-undefined for afl-clang-fast, + since they interfere with -shared. Spotted and diagnosed by Toby Hutton. + + - Added some fuzzing tips for Android. + +### Version 2.32b: + + - Added a check for AFL_HARDEN combined with AFL_USE_*SAN. Suggested by + Hanno Boeck. + + - Made several other cosmetic adjustments to cycle timing in the wake of the + big tweak made in 2.31b. + +### Version 2.31b: + + - Changed havoc cycle counts for a marked performance boost, especially + with -S / -d. See the discussion of FidgetyAFL in: + + https://groups.google.com/forum/#!topic/afl-users/fOPeb62FZUg + + While this does not implement the approach proposed by the authors of + the CCS paper, the solution is a result of digging into that research; + more improvements may follow as I do more experiments and get more + definitive data. + +### Version 2.30b: + + - Made minor improvements to persistent mode to avoid the remote + possibility of "no instrumentation detected" issues with very low + instrumentation densities. + + - Fixed a minor glitch with a leftover process in persistent mode. + Reported by Jakub Wilk and Daniel Stender. + + - Made persistent mode bitmaps a bit more consistent and adjusted the way + this is shown in the UI, especially in persistent mode. + +### Version 2.29b: + + - Made a minor #include fix to llvm_mode. Suggested by Jonathan Metzman. + + - Made cosmetic updates to the docs. + +### Version 2.28b: + + - Added "life pro tips" to docs/. + + - Moved testcases/_extras/ to dictionaries/ for visibility. + + - Made minor improvements to install scripts. + + - Added an important safety tip. + +### Version 2.27b: + + - Added libtokencap, a simple feature to intercept strcmp / memcmp and + generate dictionary entries that can help extend coverage. + + - Moved libdislocator to its own dir, added README. + + - The demo in examples/instrumented_cmp is no more. + +### Version 2.26b: + + - Made a fix for libdislocator.so to compile on MacOS X. + + - Added support for DYLD_INSERT_LIBRARIES. + + - Renamed AFL_LD_PRELOAD to AFL_PRELOAD. + +### Version 2.25b: + + - Made some cosmetic updates to libdislocator.so, renamed one env + variable. + +### Version 2.24b: + + - Added libdislocator.so, an experimental, abusive allocator. Try + it out with AFL_LD_PRELOAD=/path/to/libdislocator.so when running + afl-fuzz. + +### Version 2.23b: + + - Improved the stability metric for persistent mode binaries. Problem + spotted by Kurt Roeckx. + + - Made a related improvement that may bring the metric to 100% for those + targets. + +### Version 2.22b: + + - Mentioned the potential conflicts between MSAN / ASAN and FORTIFY_SOURCE. + There is no automated check for this, since some distros may implicitly + set FORTIFY_SOURCE outside of the compiler's argv[]. + + - Populated the support for AFL_LD_PRELOAD to all companion tools. + + - Made a change to the handling of ./afl-clang-fast -v. Spotted by + Jan Kneschke. + +### Version 2.21b: + + - Added some crash reporting notes for Solaris in docs/INSTALL, as + investigated by Martin Carpenter. + + - Fixed a minor UI mix-up with havoc strategy stats. + +### Version 2.20b: + + - Revamped the handling of variable paths, replacing path count with a + "stability" score to give users a much better signal. Based on the + feedback from Vegard Nossum. + + - Made a stability improvement to the syncing behavior with resuming + fuzzers. Based on the feedback from Vegard. + + - Changed the UI to include current input bitmap density along with + total density. Ditto. + + - Added experimental support for parallelizing -M. + +### Version 2.19b: + + - Made a fix to make sure that auto CPU binding happens at non-overlapping + times. + +### Version 2.18b: + + - Made several performance improvements to has_new_bits() and + classify_counts(). This should offer a robust performance bump with + fast targets. + +### Version 2.17b: + + - Killed the error-prone and manual -Z option. On Linux, AFL will now + automatically bind to the first free core (or complain if there are no + free cores left). + + - Made some doc updates along these lines. + +### Version 2.16b: + + - Improved support for older versions of clang (hopefully without + breaking anything). + + - Moved version data from Makefile to config.h. Suggested by + Jonathan Metzman. + +### Version 2.15b: + + - Added a README section on looking for non-crashing bugs. + + - Added license data to several boring files. Contributed by + Jonathan Metzman. + +### Version 2.14b: + + - Added FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION as a macro defined when + compiling with afl-gcc and friends. Suggested by Kostya Serebryany. + + - Refreshed some of the non-x86 docs. + +### Version 2.13b: + + - Fixed a spurious build test error with trace-pc and llvm_mode/Makefile. + Spotted by Markus Teufelberger. + + - Fixed a cosmetic issue with afl-whatsup. Spotted by Brandon Perry. + +### Version 2.12b: + + - Fixed a minor issue in afl-tmin that can make alphabet minimization less + efficient during passes > 1. Spotted by Daniel Binderman. + +### Version 2.11b: + + - Fixed a minor typo in instrumented_cmp, spotted by Hanno Eissfeldt. + + - Added a missing size check for deterministic insertion steps. + + - Made an improvement to afl-gotcpu when -Z not used. + + - Fixed a typo in post_library_png.so.c in examples/. Spotted by Kostya + Serebryany. + +### Version 2.10b: + + - Fixed a minor core counting glitch, reported by Tyler Nighswander. + +### Version 2.09b: + + - Made several documentation updates. + + - Added some visual indicators to promote and simplify the use of -Z. + +### Version 2.08b: + + - Added explicit support for -m32 and -m64 for llvm_mode. Inspired by + a request from Christian Holler. + + - Added a new benchmarking option, as requested by Kostya Serebryany. + +### Version 2.07b: + + - Added CPU affinity option (-Z) on Linux. With some caution, this can + offer a significant (10%+) performance bump and reduce jitter. + Proposed by Austin Seipp. + + - Updated afl-gotcpu to use CPU affinity where supported. + + - Fixed confusing CPU_TARGET error messages with QEMU build. Spotted by + Daniel Komaromy and others. + +### Version 2.06b: + + - Worked around LLVM persistent mode hiccups with -shared code. + Contributed by Christian Holler. + + - Added __AFL_COMPILER as a convenient way to detect that something is + built under afl-gcc / afl-clang / afl-clang-fast and enable custom + optimizations in your code. Suggested by Pedro Corte-Real. + + - Upstreamed several minor changes developed by Franjo Ivancic to + allow AFL to be built as a library. This is fairly use-specific and + may have relatively little appeal to general audiences. + +### Version 2.05b: + + - Put __sanitizer_cov_module_init & co behind #ifdef to avoid problems + with ASAN. Spotted by Christian Holler. + +### Version 2.04b: + + - Removed indirect-calls coverage from -fsanitize-coverage (since it's + redundant). Spotted by Kostya Serebryany. + +### Version 2.03b: + + - Added experimental -fsanitize-coverage=trace-pc support that goes with + some recent additions to LLVM, as implemented by Kostya Serebryany. + Right now, this is cumbersome to use with common build systems, so + the mode remains undocumented. + + - Made several substantial improvements to better support non-standard + map sizes in LLVM mode. + + - Switched LLVM mode to thread-local execution tracing, which may offer + better results in some multithreaded apps. + + - Fixed a minor typo, reported by Heiko Eissfeldt. + + - Force-disabled symbolization for ASAN, as suggested by Christian Holler. + + - AFL_NOX86 renamed to AFL_NO_X86 for consistency. + + - Added AFL_LD_PRELOAD to allow LD_PRELOAD to be set for targets without + affecting AFL itself. Suggested by Daniel Godas-Lopez. + +### Version 2.02b: + + - Fixed a "lcamtuf can't count to 16" bug in the havoc stage. Reported + by Guillaume Endignoux. + +### Version 2.01b: + + - Made an improvement to cycle counter color coding, based on feedback + from Shai Sarfaty. + + - Added a mention of aflize to sister_projects.txt. + + - Fixed an installation issue with afl-as, as spotted by ilovezfs. + +### Version 2.00b: + + - Cleaned up color handling after a minor snafu in 1.99b (affecting some + terminals). + + - Made minor updates to the documentation. + +### Version 1.99b: + + - Substantially revamped the output and the internal logic of afl-analyze. + + - Cleaned up some of the color handling code and added support for + background colors. + + - Removed some stray files (oops). + + - Updated docs to better explain afl-analyze. + +### Version 1.98b: + + - Improved to "boring string" detection in afl-analyze. + + - Added technical_details.txt for afl-analyze. + +### Version 1.97b: + + - Added afl-analyze, a nifty tool to analyze the structure of a file + based on the feedback from AFL instrumentation. This is kinda experimental, + so field reports welcome. + + - Added a mention of afl-cygwin. + + - Fixed a couple of typos, as reported by Jakub Wilk and others. + +### Version 1.96b: + + - Added -fpic to CFLAGS for the clang plugin, as suggested by Hanno Boeck. + + - Made another clang change (IRBuilder) suggested by Jeff Trull. + + - Fixed several typos, spotted by Jakub Wilk. + + - Added support for AFL_SHUFFLE_QUEUE, based on discussions with + Christian Holler. + +### Version 1.95b: + + - Fixed a harmless bug when handling -B. Spotted by Jacek Wielemborek. + + - Made the exit message a bit more accurate when AFL_EXIT_WHEN_DONE is set. + + - Added some error-checking for old-style forkserver syntax. Suggested by + Ben Nagy. + + - Switched from exit() to _exit() in injected code to avoid snafus with + destructors in C++ code. Spotted by sunblate. + + - Made a change to avoid spuriously setting __AFL_SHM_ID when + AFL_DUMB_FORKSRV is set in conjunction with -n. Spotted by Jakub Wilk. + +### Version 1.94b: + + - Changed allocator alignment to improve support for non-x86 systems (now + that llvm_mode makes this more feasible). + + - Fixed a minor typo in afl-cmin. Spotted by Jonathan Neuschafer. + + - Fixed an obscure bug that would affect people trying to use afl-gcc + with $TMP set but $TMPDIR absent. Spotted by Jeremy Barnes. + +### Version 1.93b: + + - Hopefully fixed a problem with MacOS X and persistent mode, spotted by + Leo Barnes. + +### Version 1.92b: + + - Made yet another C++ fix (namespaces). Reported by Daniel Lockyer. + +### Version 1.91b: + + - Made another fix to make 1.90b actually work properly with C++ (d'oh). + Problem spotted by Daniel Lockyer. + +### Version 1.90b: + + - Fixed a minor typo spotted by Kai Zhao; and made several other minor updates + to docs. + + - Updated the project URL for python-afl. Requested by Jakub Wilk. + + - Fixed a potential problem with deferred mode signatures getting optimized + out by the linker (with --gc-sections). + +### Version 1.89b: + + - Revamped the support for persistent and deferred forkserver modes. + Both now feature simpler syntax and do not require companion env + variables. Suggested by Jakub Wilk. + + - Added a bit more info about afl-showmap. Suggested by Jacek Wielemborek. + +### Version 1.88b: + + - Made AFL_EXIT_WHEN_DONE work in non-tty mode. Issue spotted by + Jacek Wielemborek. + +### Version 1.87b: + + - Added QuickStartGuide.txt, a one-page quick start doc. + + - Fixed several typos spotted by Dominique Pelle. + + - Revamped several parts of README. + +### Version 1.86b: + + - Added support for AFL_SKIP_CRASHES, which is a very hackish solution to + the problem of resuming sessions with intermittently crashing inputs. + + - Removed the hard-fail terminal size check, replaced with a dynamic + warning shown in place of the UI. Based on feedback from Christian Holler. + + - Fixed a minor typo in show_stats. Spotted by Dingbao Xie. + +### Version 1.85b: + + - Fixed a garbled sentence in notes on parallel fuzzing. Thanks to Jakub Wilk. + + - Fixed a minor glitch in afl-cmin. Spotted by Jonathan Foote. + +### Version 1.84b: + + - Made SIMPLE_FILES behave as expected when naming backup directories for + crashes and hangs. + + - Added the total number of favored paths to fuzzer_stats. Requested by + Ben Nagy. + + - Made afl-tmin, afl-fuzz, and afl-cmin reject negative values passed to + -t and -m, since they generally won't work as expected. + + - Made a fix for no lahf / sahf support on older versions of FreeBSD. + Patch contributed by Alex Moneger. + +### Version 1.83b: + + - Fixed a problem with xargs -d on non-Linux systems in afl-cmin. Spotted by + teor2345 and Ben Nagy. + + - Fixed an implicit declaration in LLVM mode on MacOS X. Reported by + Kai Zhao. + +### Version 1.82b: + + - Fixed a harmless but annoying race condition in persistent mode - signal + delivery is a bit more finicky than I thought. + + - Updated the documentation to explain persistent mode a bit better. + + - Tweaked AFL_PERSISTENT to force AFL_NO_VAR_CHECK. + +### Version 1.81b: + + - Added persistent mode for in-process fuzzing. See llvm_mode/README.llvm. + Inspired by Kostya Serebryany and Christian Holler. + + - Changed the in-place resume code to preserve crashes/README.txt. Suggested + by Ben Nagy. + + - Included a potential fix for LLVM mode issues on MacOS X, based on the + investigation done by teor2345. + +### Version 1.80b: + + - Made afl-cmin tolerant of whitespaces in filenames. Suggested by + Jonathan Neuschafer and Ketil Froyn. + + - Added support for AFL_EXIT_WHEN_DONE, as suggested by Michael Rash. + +### Version 1.79b: + + - Added support for dictionary levels, see testcases/README.testcases. + + - Reworked the SQL dictionary to use levels. + + - Added a note about Preeny. + +### Version 1.78b: + + - Added a dictionary for PDF, contributed by Ben Nagy. + + - Added several references to afl-cov, a new tool by Michael Rash. + + - Fixed a problem with crash reporter detection on MacOS X, as reported by + Louis Dassy. + +### Version 1.77b: + + - Extended the -x option to support single-file dictionaries. + + - Replaced factory-packaged dictionaries with file-based variants. + + - Removed newlines from HTML keywords in testcases/_extras/html/. + +### Version 1.76b: + + - Very significantly reduced the number of duplicate execs during + deterministic checks, chiefly in int16 and int32 stages. Confirmed + identical path yields. This should improve early-stage efficiency by + around 5-10%. + + - Reduced the likelihood of duplicate non-deterministic execs by + bumping up lowest stacking factor from 1 to 2. Quickly confirmed + that this doesn't seem to have significant impact on coverage with + libpng. + + - Added a note about integrating afl-fuzz with third-party tools. + +### Version 1.75b: + + - Improved argv_fuzzing to allow it to emit empty args. Spotted by Jakub + Wilk. + + - afl-clang-fast now defines __AFL_HAVE_MANUAL_INIT. Suggested by Jakub Wilk. + + - Fixed a libtool-related bug with afl-clang-fast that would make some + ./configure invocations generate incorrect output. Spotted by Jakub Wilk. + + - Removed flock() on Solaris. This means no locking on this platform, + but so be it. Problem reported by Martin Carpenter. + + - Fixed a typo. Reported by Jakub Wilk. + +### Version 1.74b: + + - Added an example argv[] fuzzing wrapper in examples/argv_fuzzing. + Reworked the bash example to be faster, too. + + - Clarified llvm_mode prerequisites for FreeBSD. + + - Improved afl-tmin to use /tmp if cwd is not writeable. + + - Removed redundant includes for sys/fcntl.h, which caused warnings with + some nitpicky versions of libc. + + - Added a corpus of basic HTML tags that parsers are likely to pay attention + to (no attributes). + + - Added EP_EnabledOnOptLevel0 to llvm_mode, so that the instrumentation is + inserted even when AFL_DONT_OPTIMIZE=1 is set. + + - Switched qemu_mode to use the newly-released QEMU 2.3.0, which contains + a couple of minor bugfixes. + +### Version 1.73b: + + - Fixed a pretty stupid bug in effector maps that could sometimes cause + AFL to fuzz slightly more than necessary; and in very rare circumstances, + could lead to SEGV if eff_map is aligned with page boundary and followed + by an unmapped page. Spotted by Jonathan Gray. + +### Version 1.72b: + + - Fixed a glitch in non-x86 install, spotted by Tobias Ospelt. + + - Added a minor safeguard to llvm_mode Makefile following a report from + Kai Zhao. + +### Version 1.71b: + + - Fixed a bug with installed copies of AFL trying to use QEMU mode. Spotted + by G.M. Lime. + + - Added last path / crash / hang times to fuzzer_stats, suggested by + Richard Hipp. + + - Fixed a typo, thanks to Jakub Wilk. + +### Version 1.70b: + + - Modified resumption code to reuse the original timeout value when resuming + a session if -t is not given. This prevents timeout creep in continuous + fuzzing. + + - Added improved error messages for failed handshake when AFL_DEFER_FORKSRV + is set. + + - Made a slight improvement to llvm_mode/Makefile based on feedback from + Jakub Wilk. + + - Refreshed several bits of documentation. + + - Added a more prominent note about the MacOS X trade-offs to Makefile. + +### Version 1.69b: + + - Added support for deferred initialization in LLVM mode. Suggested by + Richard Godbee. + +### Version 1.68b: + + - Fixed a minor PRNG glitch that would make the first seconds of a fuzzing + job deterministic. Thanks to Andreas Stieger. + + - Made tmp[] static in the LLVM runtime to keep Valgrind happy (this had + no impact on anything else). Spotted by Richard Godbee. + + - Clarified the footnote in README. + +### Version 1.67b: + + - Made one more correction to llvm_mode Makefile, spotted by Jakub Wilk. + +### Version 1.66b: + + - Added CC / CXX support to llvm_mode Makefile. Requested by Charlie Eriksen. + + - Fixed 'make clean' with gmake. Suggested by Oliver Schneider. + + - Fixed 'make -j n clean all'. Suggested by Oliver Schneider. + + - Removed build date and time from banners to give people deterministic + builds. Requested by Jakub Wilk. + +### Version 1.65b: + + - Fixed a snafu with some leftover code in afl-clang-fast. + + - Corrected even moar typos. + +### Version 1.64b: + + - Further simplified afl-clang-fast runtime by reverting .init_array to + __attribute__((constructor(0)). This should improve compatibility with + non-ELF platforms. + + - Fixed a problem with afl-clang-fast and -shared libraries. Simplified + the code by getting rid of .preinit_array and replacing it with a .comm + object. Problem reported by Charlie Eriksen. + + - Removed unnecessary instrumentation density adjustment for the LLVM mode. + Reported by Jonathan Neuschafer. + +### Version 1.63b: + + - Updated cgroups_asan/ with a new version from Sam, made a couple changes + to streamline it and keep parallel afl instances in separate groups. + + - Fixed typos, thanks to Jakub Wilk. + +### Version 1.62b: + + - Improved the handling of -x in afl-clang-fast, + + - Improved the handling of low AFL_INST_RATIO settings for QEMU and + LLVM modes. + + - Fixed the llvm-config bug for good (thanks to Tobias Ospelt). + +### Version 1.61b: + + - Fixed an obscure bug compiling OpenSSL with afl-clang-fast. Patch by + Laszlo Szekeres. + + - Fixed a 'make install' bug on non-x86 systems, thanks to Tobias Ospelt. + + - Fixed a problem with half-broken llvm-config on Odroid, thanks to + Tobias Ospelt. (There is another odd bug there that hasn't been fully + fixed - TBD). + +### Version 1.60b: + + - Allowed examples/llvm_instrumentation/ to graduate to llvm_mode/. + + - Removed examples/arm_support/, since it's completely broken and likely + unnecessary with LLVM support in place. + + - Added ASAN cgroups script to examples/asan_cgroups/, updated existing + docs. Courtesy Sam Hakim and David A. Wheeler. + + - Refactored afl-tmin to reduce the number of execs in common use cases. + Ideas from Jonathan Neuschafer and Turo Lamminen. + + - Added a note about CLAs at the bottom of README. + + - Renamed testcases_readme.txt to README.testcases for some semblance of + consistency. + + - Made assorted updates to docs. + + - Added MEM_BARRIER() to afl-showmap and afl-tmin, just to be safe. + +### Version 1.59b: + + - Imported Laszlo Szekeres' experimental LLVM instrumentation into + examples/llvm_instrumentation. I'll work on including it in the + "mainstream" version soon. + + - Fixed another typo, thanks to Jakub Wilk. + +### Version 1.58b: + + - Added a workaround for abort() behavior in -lpthread programs in QEMU mode. + Spotted by Aidan Thornton. + + - Made several documentation updates, including links to the static + instrumentation tool (sister_projects.txt). + +### Version 1.57b: + + - Fixed a problem with exception handling on some versions of MacOS X. + Spotted by Samir Aguiar and Anders Wang Kristensen. + + - Tweaked afl-gcc to use BIN_PATH instead of a fixed string in help + messages. + +### Version 1.56b: + + - Renamed related_work.txt to historical_notes.txt. + + - Made minor edits to the ASAN doc. + + - Added docs/sister_projects.txt with a list of inspired or closely + related utilities. + +### Version 1.55b: + + - Fixed a glitch with afl-showmap opening /dev/null with O_RDONLY when + running in quiet mode. Spotted by Tyler Nighswander. + +### Version 1.54b: + + - Added another postprocessor example for PNG. + + - Made a cosmetic fix to realloc() handling in examples/post_library/, + suggested by Jakub Wilk. + + - Improved -ldl handling. Suggested by Jakub Wilk. + +### Version 1.53b: + + - Fixed an -l ordering issue that is apparently still a problem on Ubuntu. + Spotted by William Robinet. + +### Version 1.52b: + + - Added support for file format postprocessors. Requested by Ben Nagy. This + feature is intentionally buried, since it's fairly easy to misuse and + useful only in some scenarios. See examples/post_library/. + +### Version 1.51b: + + - Made it possible to properly override LD_BIND_NOW after one very unusual + report of trouble. + + - Cleaned up typos, thanks to Jakub Wilk. + + - Fixed a bug in AFL_DUMB_FORKSRV. + +### Version 1.50b: + + - Fixed a flock() bug that would prevent dir reuse errors from kicking + in every now and then. + + - Renamed references to ppvm (the project is now called recidivm). + + - Made improvements to file descriptor handling to avoid leaving some fds + unnecessarily open in the child process. + + - Fixed a typo or two. + +### Version 1.49b: + + - Added code to save original command line in fuzzer_stats and + crashes/README.txt. Also saves fuzzer version in fuzzer_stats. + Requested by Ben Nagy. + +### Version 1.48b: + + - Fixed a bug with QEMU fork server crashes when translation is attempted + after a jump to an invalid pointer in the child process (i.e., after + bumping into a particularly nasty security bug in the tested binary). + Reported by Tyler Nighswander. + +### Version 1.47b: + + - Fixed a bug with afl-cmin in -Q mode complaining about binary being not + instrumented. Thanks to Jonathan Neuschafer for the bug report. + + - Fixed another bug with argv handling for afl-fuzz in -Q mode. Reported + by Jonathan Neuschafer. + + - Improved the use of colors when showing crash counts in -C mode. + +### Version 1.46b: + + - Improved instrumentation performance on 32-bit systems by getting rid of + xor-swap (oddly enough, xor-swap is still faster on 64-bit) and tweaking + alignment. + + - Made path depth numbers more accurate with imported test cases. + +### Version 1.45b: + + - Added support for SIMPLE_FILES in config.h for folks who don't like + descriptive file names. Generates very simple names without colons, + commas, plus signs, dashes, etc. + + - Replaced zero-sized files with symlinks in the variable behavior state + dir to simplify examining the relevant test cases. + + - Changed the period of limited-range block ops from 5 to 10 minutes based + on a couple of experiments. The basic goal of this delay timer behavior + is to better support jobs that are seeded with completely invalid files, + in which case, the first few queue cycles may be completed very quickly + without discovering new paths. Should have no effect on well-seeded jobs. + + - Made several minor updates to docs. + +### Version 1.44b: + + - Corrected two bungled attempts to get the -C mode work properly + with afl-cmin (accounting for the short-lived releases tagged 1.42 and + 1.43b) - sorry. + + - Removed AFL_ALLOW_CRASHES in favor of the -C mode in said tool. + + - Said goodbye to Hello Kitty, as requested by Padraig Brady. + +### Version 1.41b: + + - Added AFL_ALLOW_CRASHES=1 to afl-cmin. Allows crashing inputs in the + output corpus. Changed the default behavior to disallow it. + + - Made the afl-cmin output dir default to 0700, not 0755, to be consistent + with afl-fuzz; documented the rationale for 0755 in afl-plot. + + - Lowered the output dir reuse time limit to 25 minutes as a dice-roll + compromise after a discussion on afl-users@. + + - Made afl-showmap accept -o /dev/null without borking out. + + - Added support for crash / hang info in exit codes of afl-showmap. + + - Tweaked block operation scaling to also factor in ballpark run time + in cases where queue passes take very little time. + + - Fixed typos and made improvements to several docs. + +### Version 1.40b: + + - Switched to smaller block op sizes during the first passes over the + queue. Helps keep test cases small. + + - Added memory barrier for run_target(), just in case compilers get + smarter than they are today. + + - Updated a bunch of docs. + +### Version 1.39b: + + - Added the ability to skip inputs by sending SIGUSR1 to the fuzzer. + + - Reworked several portions of the documentation. + + - Changed the code to reset splicing perf scores between runs to keep + them closer to intended length. + + - Reduced the minimum value of -t to 5 for afl-fuzz (~200 exec/sec) + and to 10 for auxiliary tools (due to the absence of a fork server). + + - Switched to more aggressive default timeouts (rounded up to 25 ms + versus 50 ms - ~40 execs/sec) and made several other cosmetic changes + to the timeout code. + +### Version 1.38b: + + - Fixed a bug in the QEMU build script, spotted by William Robinet. + + - Improved the reporting of skipped bitflips to keep the UI counters a bit + more accurate. + + - Cleaned up related_work.txt and added some non-goals. + + - Fixed typos, thanks to Jakub Wilk. + +### Version 1.37b: + + - Added effector maps, which detect regions that do not seem to respond + to bitflips and subsequently exclude them from more expensive steps + (arithmetics, known ints, etc). This should offer significant performance + improvements with quite a few types of text-based formats, reducing the + number of deterministic execs by a factor of 2 or so. + + - Cleaned up mem limit handling in afl-cmin. + + - Switched from uname -i to uname -m to work around Gentoo-specific + issues with coreutils when building QEMU. Reported by William Robinet. + + - Switched from PID checking to flock() to detect running sessions. + Problem, against all odds, bumped into by Jakub Wilk. + + - Added SKIP_COUNTS and changed the behavior of COVERAGE_ONLY in config.h. + Useful only for internal benchmarking. + + - Made improvements to UI refresh rates and exec/sec stats to make them + more stable. + + - Made assorted improvements to the documentation and to the QEMU build + script. + + - Switched from perror() to strerror() in error macros, thanks to Jakub + Wilk for the nag. + + - Moved afl-cmin back to bash, wasn't thinking straight. It has to stay + on bash because other shells may have restrictive limits on array sizes. + +### Version 1.36b: + + - Switched afl-cmin over to /bin/sh. Thanks to Jonathan Gray. + + - Fixed an off-by-one bug in queue limit check when resuming sessions + (could cause NULL ptr deref if you are *really* unlucky). + + - Fixed the QEMU script to tolerate i686 if returned by uname -i. Based on + a problem report from Sebastien Duquette. + + - Added multiple references to Jakub's ppvm tool. + + - Made several minor improvements to the Makefile. + + - Believe it or not, fixed some typos. Thanks to Jakub Wilk. + +### Version 1.35b: + + - Cleaned up regular expressions in some of the scripts to avoid errors + on *BSD systems. Spotted by Jonathan Gray. + +### Version 1.34b: + + - Performed a substantial documentation and program output cleanup to + better explain the QEMU feature. + +### Version 1.33b: + + - Added support for AFL_INST_RATIO and AFL_INST_LIBS in the QEMU mode. + + - Fixed a stack allocation crash in QEMU mode (bug in QEMU, fixed with + an extra patch applied to the downloaded release). + + - Added code to test the QEMU instrumentation once the afl-qemu-trace + binary is built. + + - Modified afl-tmin and afl-showmap to search $PATH for binaries and to + better handle QEMU support. + + - Added a check for instrumented binaries when passing -Q to afl-fuzz. + +### Version 1.32b: + + - Fixed 'make install' following the QEMU changes. Spotted by Hanno Boeck. + + - Fixed EXTRA_PAR handling in afl-cmin. + +### Version 1.31b: + + - Hallelujah! Thanks to Andrew Griffiths, we now support very fast, black-box + instrumentation of binary-only code. See qemu_mode/README.qemu. + + To use this feature, you need to follow the instructions in that + directory and then run afl-fuzz with -Q. + +### Version 1.30b: + + - Added -s (summary) option to afl-whatsup. Suggested by Jodie Cunningham. + + - Added a sanity check in afl-tmin to detect minimization to zero len or + excess hangs. + + - Fixed alphabet size counter in afl-tmin. + + - Slightly improved the handling of -B in afl-fuzz. + + - Fixed process crash messages with -m none. + +### Version 1.29b: + + - Improved the naming of test cases when orig: is already present in the file + name. + + - Made substantial improvements to technical_details.txt. + +### Version 1.28b: + + - Made a minor tweak to the instrumentation to preserve the directionality + of tuples (i.e., A -> B != B -> A) and to maintain the identity of tight + loops (A -> A). You need to recompile targeted binaries to leverage this. + + - Cleaned up some of the afl-whatsup stats. + + - Added several sanity checks to afl-cmin. + +### Version 1.27b: + + - Made afl-tmin recursive. Thanks to Hanno Boeck for the tip. + + - Added docs/technical_details.txt. + + - Changed afl-showmap search strategy in afl-cmap to just look into the + same place that afl-cmin is executed from. Thanks to Jakub Wilk. + + - Removed current_todo.txt and cleaned up the remaining docs. + +### Version 1.26b: + + - Added total execs/sec stat for afl-whatsup. + + - afl-cmin now auto-selects between cp or ln. Based on feedback from + Even Huus. + + - Fixed a typo. Thanks to Jakub Wilk. + + - Made afl-gotcpu a bit more accurate by using getrusage instead of + times. Thanks to Jakub Wilk. + + - Fixed a memory limit issue during the build process on NetBSD-current. + Reported by Thomas Klausner. + +### Version 1.25b: + + - Introduced afl-whatsup, a simple tool for querying the status of + local synced instances of afl-fuzz. + + - Added -x compiler to clang options on Darwin. Suggested by Filipe + Cabecinhas. + + - Improved exit codes for afl-gotcpu. + + - Improved the checks for -m and -t values in afl-cmin. Bug report + from Evan Huus. + +### Version 1.24b: + + - Introduced afl-getcpu, an experimental tool to empirically measure + CPU preemption rates. Thanks to Jakub Wilk for the idea. + +### Version 1.23b: + + - Reverted one change to afl-cmin that actually made it slower. + +### Version 1.22b: + + - Reworked afl-showmap.c to support normal options, including -o, -q, + -e. Also added support for timeouts and memory limits. + + - Made changes to afl-cmin and other scripts to accommodate the new + semantics. + + - Officially retired AFL_EDGES_ONLY. + + - Fixed another typo in afl-tmin, courtesy of Jakub Wilk. + +### Version 1.21b: + + - Graduated minimize_corpus.sh to afl-cmin. It is now a first-class + utility bundled with the fuzzer. + + - Made significant improvements to afl-cmin to make it faster, more + robust, and more versatile. + + - Refactored some of afl-tmin code to make it a bit more readable. + + - Made assorted changes to the doc to document afl-cmin and other stuff. + +### Version 1.20b: + + - Added AFL_DUMB_FORKSRV, as requested by Jakub Wilk. This works only + in -n mode and allows afl-fuzz to run with "dummy" fork servers that + don't output any instrumentation, but follow the same protocol. + + - Renamed AFL_SKIP_CHECKS to AFL_SKIP_BIN_CHECK to make it at least + somewhat descriptive. + + - Switched to using clang as the default assembler on MacOS X to work + around Xcode issues with newer builds of clang. Testing and patch by + Nico Weber. + + - Fixed a typo (via Jakub Wilk). + +### Version 1.19b: + + - Improved exec failure detection in afl-fuzz and afl-showmap. + + - Improved Ctrl-C handling in afl-showmap. + + - Added afl-tmin, a handy instrumentation-enabled minimizer. + +### Version 1.18b: + + - Fixed a serious but short-lived bug in the resumption behavior introduced + in version 1.16b. + + - Added -t nn+ mode for soft-skipping timing-out paths. + +### Version 1.17b: + + - Fixed a compiler warning introduced in 1.16b for newer versions of GCC. + Thanks to Jakub Wilk and Ilfak Guilfanov. + + - Improved the consistency of saving fuzzer_stats, bitmap info, and + auto-dictionaries when aborting fuzzing sessions. + + - Made several noticeable performance improvements to deterministic arith + and known int steps. + +### Version 1.16b: + + - Added a bit of code to make resumption pick up from the last known + offset in the queue, rather than always rewinding to the start. Suggested + by Jakub Wilk. + + - Switched to tighter timeout control for slow programs (3x rather than + 5x average exec speed at init). + +### Version 1.15b: + + - Added support for AFL_NO_VAR_CHECK to speed up resumption and inhibit + variable path warnings for some programs. + + - Made the trimmer run even for variable paths, since there is no special + harm in doing so and it can be very beneficial if the trimming still + pans out. + + - Made the UI a bit more descriptive by adding "n/a" instead of "0" in a + couple of corner cases. + +### Version 1.14b: + + - Added a (partial) dictionary for JavaScript. + + - Added AFL_NO_CPU_RED, as suggested by Jakub Wilk. + + - Tweaked the havoc scaling logic added in 1.12b. + +### Version 1.13b: + + - Improved the performance of minimize_corpus.sh by switching to a + sort-based approach. + + - Made several minor revisions to the docs. + +### Version 1.12b: + + - Made an improvement to dictionary generation to avoid runs of identical + bytes. + + - Added havoc cycle scaling to help with slow binaries in -d mode. Based on + a thread with Sami Liedes. + + - Added AFL_SYNC_FIRST for afl-fuzz. This is useful for those who obsess + over stats, no special purpose otherwise. + + - Switched to more robust box drawing codes, suggested by Jakub Wilk. + + - Created faster 64-bit variants of several critical-path bitmap functions + (sorry, no difference on 32 bits). + + - Fixed moar typos, as reported by Jakub Wilk. + +### Version 1.11b: + + - Added a bit more info about dictionary strategies to the status screen. + +### Version 1.10b: + + - Revised the dictionary behavior to use insertion and overwrite in + deterministic steps, rather than just the latter. This improves coverage + with SQL and the like. + + - Added a mention of "*" in status_screen.txt, as suggested by Jakub Wilk. + +### Version 1.09b: + + - Corrected a cosmetic problem with 'extras' stage count not always being + accurate in the stage yields view. + + - Fixed a typo reported by Jakub Wilk and made some minor documentation + improvements. + +### Version 1.08b: + + - Fixed a div-by-zero bug in the newly-added code when using a dictionary. + +### Version 1.07b: + + - Added code that automatically finds and extracts syntax tokens from the + input corpus. + + - Fixed a problem with ld dead-code removal option on MacOS X, reported + by Filipe Cabecinhas. + + - Corrected minor typos spotted by Jakub Wilk. + + - Added a couple of more exotic archive format samples. + +### Version 1.06b: + + - Switched to slightly more accurate (if still not very helpful) reporting + of short read and short write errors. These theoretically shouldn't happen + unless you kill the forkserver or run out of disk space. Suggested by + Jakub Wilk. + + - Revamped some of the allocator and debug code, adding comments and + cleaning up other mess. + + - Tweaked the odds of fuzzing non-favored test cases to make sure that + baseline coverage of all inputs is reached sooner. + +### Version 1.05b: + + - Added a dictionary for WebP. + + - Made some additional performance improvements to minimize_corpus.sh, + getting deeper into the bash woods. + +### Version 1.04b: + + - Made substantial performance improvements to minimize_corpus.sh with + large datasets, albeit at the expense of having to switch back to bash + (other shells may have limits on array sizes, etc). + + - Tweaked afl-showmap to support the format used by the new script. + +### Version 1.03b: + + - Added code to skip README.txt in the input directory to make the crash + exploration mode work better. Suggested by Jakub Wilk. + + - Added a dictionary for SQLite. + +### Version 1.02b: + + - Reverted the ./ search path in minimize_corpus.sh because people did + not like it. + + - Added very explicit warnings not to run various shell scripts that + read or write to /tmp/ (since this is generally a pretty bad idea on + multi-user systems). + + - Added a check for /tmp binaries and -f locations in afl-fuzz. + +### Version 1.01b: + + - Added dictionaries for XML and GIF. + +### Version 1.00b: + + - Slightly improved the performance of minimize_corpus.sh, especially on + Linux. + + - Made a couple of improvements to calibration timeouts for resumed scans. + +### Version 0.99b: + + - Fixed minimize_corpus.sh to work with dash, as suggested by Jakub Wilk. + + - Modified minimize_corpus.sh to try locate afl-showmap in $PATH and ./. + The first part requested by Jakub Wilk. + + - Added support for afl-as --version, as required by one funky build + script. Reported by William Robinet. + +### Version 0.98b: + + - Added a dictionary for TIFF. + + - Fixed another cosmetic snafu with stage exec counts for -x. + + - Switched afl-plot to /bin/sh, since it seems bashism-free. Also tried + to remove any obvious bashisms from other examples/ scripts, + most notably including minimize_corpus.sh and triage_crashes.sh. + Requested by Jonathan Gray. + +### Version 0.97b: + + - Fixed cosmetic issues around the naming of -x strategy files. + + - Added a dictionary for JPEG. + + - Fixed a very rare glitch when running instrumenting 64-bit code that makes + heavy use of xmm registers that are also touched by glibc. + +### Version 0.96b: + + - Added support for extra dictionaries, provided testcases/_extras/png/ + as a demo. + + - Fixed a minor bug in number formatting routines used by the UI. + + - Added several additional PNG test cases that are relatively unlikely + to be hit by chance. + + - Fixed afl-plot syntax for gnuplot 5.x. Reported by David Necas. + +### Version 0.95b: + + - Cleaned up the OSX ReportCrash code. Thanks to Tobias Ospelt for help. + + - Added some extra tips for AFL_NO_FORKSERVER on OSX. + + - Refreshed the INSTALL file. + +### Version 0.94b: + + - Added in-place resume (-i-) to address a common user complaint. + + - Added an awful workaround for ReportCrash on MacOS X. Problem + spotted by Joseph Gentle. + +### Version 0.93b: + + - Fixed the link() workaround, as reported by Jakub Wilk. + +### Version 0.92b: + + - Added support for reading test cases from another filesystem. + Requested by Jakub Wilk. + + - Added pointers to the mailing list. + + - Added a sample PDF document. + +### Version 0.91b: + + - Refactored minimize_corpus.sh to make it a bit more user-friendly and to + select for smallest files, not largest bitmaps. Offers a modest corpus + size improvement in most cases. + + - Slightly improved the performance of splicing code. + +### Version 0.90b: + + - Moved to an algorithm where paths are marked as preferred primarily based + on size and speed, rather than bitmap coverage. This should offer + noticeable performance gains in many use cases. + + - Refactored path calibration code; calibration now takes place as soon as a + test case is discovered, to facilitate better prioritization decisions later + on. + + - Changed the way of marking variable paths to avoid .state metadata + inconsistencies. + + - Made sure that calibration routines always create a new test case to avoid + hypothetical problems with utilities that modify the input file. + + - Added bitmap saturation to fuzzer stats and plot data. + + - Added a testcase for JPEG XR. + + - Added a tty check for the colors warning in Makefile, to keep distro build + logs tidy. Suggested by Jakub Wilk. + +### Version 0.89b: + + - Renamed afl-plot.sh to afl-plot, as requested by Padraig Brady. + + - Improved the compatibility of afl-plot with older versions of gnuplot. + + - Added banner information to fuzzer_stats, populated it to afl-plot. + +### Version 0.88b: + + - Added support for plotting, with design and implementation based on a + prototype design proposed by Michael Rash. Huge thanks! + + - Added afl-plot.sh, which allows you to, well, generate a nice plot using + this data. + + - Refactored the code slightly to make more frequent updates to fuzzer_stats + and to provide more detail about synchronization. + + - Added an fflush(stdout) call for non-tty operation, as requested by + Joonas Kuorilehto. + + - Added some detail to fuzzer_stats for parity with plot_file. + +### Version 0.87b: + + - Added support for MSAN, via AFL_USE_MSAN, same gotchas as for ASAN. + +### Version 0.86b: + + - Added AFL_NO_FORKSRV, allowing the forkserver to be bypassed. Suggested + by Ryan Govostes. + + - Simplified afl-showmap.c to make use of the no-forkserver mode. + + - Made minor improvements to crash_triage.sh, as suggested by Jakub Wilk. + +### Version 0.85b: + + - Fixed the CPU counting code - no sysctlbyname() on OpenBSD, d'oh. Bug + reported by Daniel Dickman. + + - Made a slight correction to error messages - the advice on testing + with ulimit was a tiny bit off by a factor of 1024. + +### Version 0.84b: + + - Added support for the CPU widget on some non-Linux platforms (I hope). + Based on feedback from Ryan Govostes. + + - Cleaned up the changelog (very meta). + +### Version 0.83b: + + - Added examples/clang_asm_normalize/ and related notes in + env_variables.txt and afl-as.c. Thanks to Ryan Govostes for the idea. + + - Added advice on hardware utilization in README. + +### Version 0.82b: + + - Made additional fixes for Xcode support, juggling -Q and -q flags. Thanks to + Ryan Govostes. + + - Added a check for __asm__ blocks and switches to .intel_syntax in assembly. + Based on feedback from Ryan Govostes. + +### Version 0.81b: + + - A workaround for Xcode 6 as -Q flag glitch. Spotted by Ryan Govostes. + + - Improved Solaris build instructions, as suggested by Martin Carpenter. + + - Fix for a slightly busted path scoring conditional. Minor practical impact. + +### Version 0.80b: + + - Added a check for $PATH-induced loops. Problem noticed by Kartik Agaram. + + - Added AFL_KEEP_ASSEMBLY for easier troubleshooting. + + - Added an override for AFL_USE_ASAN if set at afl compile time. Requested by + Hanno Boeck. + +### Version 0.79b: + + - Made minor adjustments to path skipping logic. + + - Made several documentation updates to reflect the path selection changes + made in 0.78b. + +### Version 0.78b: + + - Added a CPU governor check. Bug report from Joe Zbiciak. + + - Favored paths are now selected strictly based on new edges, not hit + counts. This speeds up the first pass by a factor of 3-6x without + significantly impacting ultimate coverage (tested with libgif, libpng, + libjpeg). + + It also allows some performance & memory usage improvements by making + some of the in-memory bitmaps much smaller. + + - Made multiple significant performance improvements to bitmap checking + functions, plus switched to a faster hash. + + - Owing largely to these optimizations, bumped the size of the bitmap to + 64k and added a warning to detect older binaries that rely on smaller + bitmaps. + +### Version 0.77b: + + - Added AFL_SKIP_CHECKS to bypass binary checks when really warranted. + Feature requested by Jakub Wilk. + + - Fixed a couple of typos. + + - Added a warning for runs that are aborted early on. + +### Version 0.76b: + + - Incorporated another signal handling fix for Solaris. Suggestion + submitted by Martin Carpenter. + +### Version 0.75b: + + - Implemented a slightly more "elegant" kludge for the %llu glitch (see + types.h). + + - Relaxed CPU load warnings to stay in sync with reality. + +### Version 0.74b: + + - Switched to more responsive exec speed averages and better UI speed + scaling. + + - Fixed a bug with interrupted reads on Solaris. Issue spotted by Martin + Carpenter. + +### Version 0.73b: + + - Fixed a stray memcpy() instead of memmove() on overlapping buffers. + Mostly harmless but still dumb. Mistake spotted thanks to David Higgs. + +### Version 0.72b: + + - Bumped map size up to 32k. You may want to recompile instrumented + binaries (but nothing horrible will happen if you don't). + + - Made huge performance improvements for bit-counting functions. + + - Default optimizations now include -funroll-loops. This should have + interesting effects on the instrumentation. Frankly, I'm just going to + ship it and see what happens next. I have a good feeling about this. + + - Made a fix for stack alignment crash on MacOS X 10.10; looks like the + rhetorical question in the comments in afl-as.h has been answered. + Tracked down by Mudge Zatko. + +### Version 0.71b: + + - Added a fix for the nonsensical MacOS ELF check. Spotted by Mudge Zatko. + + - Made some improvements to ASAN checks. + +### Version 0.70b: + + - Added explicit detection of ASANified binaries. + + - Fixed compilation issues on Solaris. Reported by Martin Carpenter. + +### Version 0.69b: + + - Improved the detection of non-instrumented binaries. + + - Made the crash counter in -C mode accurate. + + - Fixed an obscure install bug that made afl-as non-functional with the tool + installed to /usr/bin instead of /usr/local/bin. Found by Florian Kiersch. + + - Fixed for a cosmetic SIGFPE when Ctrl-C is pressed while the fork server + is spinning up. + +### Version 0.68b: + + - Added crash exploration mode! Woot! + +### Version 0.67b: + + - Fixed several more typos, the project is now cartified 100% typo-free. + Thanks to Thomas Jarosch and Jakub Wilk. + + - Made a change to write fuzzer_stats early on. + + - Fixed a glitch when (not!) running on MacOS X as root. Spotted by Tobias + Ospelt. + + - Made it possible to override -O3 in Makefile. Suggested by Jakub Wilk. + +### Version 0.66b: + + - Fixed a very obscure issue with build systems that use gcc as an assembler + for hand-written .s files; this would confuse afl-as. Affected nss, reported + by Hanno Boeck. + + - Fixed a bug when cleaning up synchronized fuzzer output dirs. Issue reported + by Thomas Jarosch. + +### Version 0.65b: + + - Cleaned up shell printf escape codes in Makefile. Reported by Jakub Wilk. + + - Added more color to fuzzer_stats, provided short documentation of the file + format, and made several other stats-related improvements. + +### Version 0.64b: + + - Enabled GCC support on MacOS X. + +### Version 0.63b: + + - Provided a new, simplified way to pass data in files (@@). See README. + + - Made additional fixes for 64-bit MacOS X, working around a crashing bug in + their linker (umpf) and several other things. It's alive! + + - Added a minor workaround for a bug in 64-bit FreeBSD (clang -m32 -g doesn't + work on that platform, but clang -m32 does, so we no longer insert -g). + + - Added a build-time warning for inverse video terminals and better + instructions in status_screen.txt. + +### Version 0.62b: + + - Made minor improvements to the allocator, as suggested by Tobias Ospelt. + + - Added example instrumented memcmp() in examples/instrumented_cmp. + + - Added a speculative fix for MacOS X (clang detection, again). + + - Fixed typos in parallel_fuzzing.txt. Problems spotted by Thomas Jarosch. + +### Version 0.61b: + + - Fixed a minor issue with clang detection on systems with a clang cc + wrapper, so that afl-gcc doesn't confuse it with GCC. + + - Made cosmetic improvements to docs and to the CPU load indicator. + + - Fixed a glitch with crash removal (README.txt left behind, d'oh). + +### Version 0.60b: + + - Fixed problems with jump tables generated by exotic versions of GCC. This + solves an outstanding problem on OpenBSD when using afl-gcc + PIE (not + present with afl-clang). + + - Fixed permissions on one of the sample archives. + + - Added a lahf / sahf workaround for OpenBSD (their assembler doesn't know + about these opcodes). + + - Added docs/INSTALL. + +### Version 0.59b: + + - Modified 'make install' to also install test cases. + + - Provided better pointers to installed README in afl-fuzz. + + - More work on RLIMIT_AS for OpenBSD. + +### Version 0.58b: + + - Added a core count check on Linux. + + - Refined the code for the lack-of-RLIMIT_AS case on OpenBSD. + + - Added a rudimentary CPU utilization meter to help with optimal loading. + +### Version 0.57b: + + - Made fixes to support FreeBSD and OpenBSD: use_64bit is now inferred if not + explicitly specified when calling afl-as, and RLIMIT_AS is behind an #ifdef. + Thanks to Fabian Keil and Jonathan Gray for helping troubleshoot this. + + - Modified 'make install' to also install docs (in /usr/local/share/doc/afl). + + - Fixed a typo in status_screen.txt. + + - Made a couple of Makefile improvements as proposed by Jakub Wilk. + +### Version 0.56b: + + - Added probabilistic instrumentation density reduction in ASAN mode. This + compensates for ASAN-specific branches in a crude but workable way. + + - Updated notes_for_asan.txt. + +### Version 0.55b: + + - Implemented smarter out_dir behavior, automatically deleting directories + that don't contain anything of special value. Requested by several folks, + including Hanno Boeck. + + - Added more detail in fuzzer_stats (start time, run time, fuzzer PID). + + - Implemented support for configurable install prefixes in Makefile + ($PREFIX), as requested by Luca Barbato. + + - Made it possible to resume by doing -i <out_dir>, without having to specify + -i <out_dir>/queue/. + +### Version 0.54b: + + - Added a fix for -Wformat warning messages (oops, I thought this had been in + place for a while). + +### Version 0.53b: + + - Redesigned the crash & hang duplicate detection code to better deal with + fault conditions that can be reached in a multitude of ways. + + The old approach could be compared to hashing stack traces to de-dupe + crashes, a method prone to crash count inflation. The alternative I + wanted to avoid would be equivalent to just looking at crash %eip, + which can have false negatives in common functions such as memcpy(). + + The middle ground currently used in afl-fuzz can be compared to looking + at every line item in the stack trace and tagging crashes as unique if + we see any function name that we haven't seen before (or if something that + we have *always* seen there suddenly disappears). We do the comparison + without paying any attention to ordering or hit counts. This can still + cause some crash inflation early on, but the problem will quickly taper + off. So, you may get 20 dupes instead of 5,000. + + - Added a fix for harmless but absurd trim ratios shown if the first exec in + the trimmer timed out. Spotted by @EspenGx. + +### Version 0.52b: + + - Added a quick summary of the contents in examples/. + + - Made a fix to the process of writing fuzzer_stats. + + - Slightly reorganized the .state/ directory, now recording redundant paths, + too. Note that this breaks the ability to properly resume older sessions + - sorry about that. + + (To fix this, simply move <out_dir>/.state/* from an older run + to <out_dir>/.state/deterministic_done/*.) + +### Version 0.51b: + + - Changed the search order for afl-as to avoid the problem with older copies + installed system-wide; this also means that I can remove the Makefile check + for that. + + - Made it possible to set instrumentation ratio of 0%. + + - Introduced some typos, fixed others. + + - Fixed the test_prev target in Makefile, as reported by Ozzy Johnson. + +### Version 0.50b: + + - Improved the 'make install' logic, as suggested by Padraig Brady. + + - Revamped various bits of the documentation, especially around perf_tips.txt; + based on the feedback from Alexander Cherepanov. + + - Added AFL_INST_RATIO to afl-as. The only case where this comes handy is + ffmpeg, at least as far as I can tell. (Trivia: the current version of + ffmpeg ./configure also ignores CC and --cc, probably unintentionally). + + - Added documentation for all environmental variables (env_variables.txt). + + - Implemented a visual warning for excessive or insufficient bitmap density. + + - Changed afl-gcc to add -O3 by default; use AFL_DONT_OPTIMIZE if you don't + like that. Big speed gain for ffmpeg, so seems like a good idea. + + - Made a regression fix to afl-as to ignore .LBB labels in gcc mode. + +### Version 0.49b: + + - Fixed more typos, as found by Jakub Wilk. + + - Added support for clang! + + - Changed AFL_HARDEN to *not* include ASAN by default. Use AFL_USE_ASAN if + needed. The reasons for this are in notes_for_asan.txt. + + - Switched from configure auto-detection to isatty() to keep afl-as and + afl-gcc quiet. + + - Improved installation process to properly create symlinks, rather than + copies of binaries. + +### Version 0.48b: + + - Improved afl-fuzz to force-set ASAN_OPTIONS=abort_on_error=1. Otherwise, + ASAN crashes wouldn't be caught at all. Reported by Hanno Boeck. + + - Improved Makefile mkdir logic, as suggested by Hanno Boeck. + + - Improved the 64-bit instrumentation to properly save r8-r11 registers in + the x86 setup code. The old behavior could cause rare problems running + *without* instrumentation when the first function called in a particular + .o file has 5+ parameters. No impact on code running under afl-fuzz or + afl-showmap. Issue spotted by Padraig Brady. + +### Version 0.47b: + + - Fixed another Makefile bug for parallel builds of afl. Problem identified + by Richard W. M. Jones. + + - Added support for suffixes for -m. + + - Updated the documentation and added notes_for_asan.txt. Based on feedback + from Hanno Boeck, Ben Laurie, and others. + + - Moved the project to http://lcamtuf.coredump.cx/afl/. + +### Version 0.46b: + + - Cleaned up Makefile dependencies for parallel builds. Requested by + Richard W. M. Jones. + + - Added support for DESTDIR in Makefile. Once again suggested by + Richard W. M. Jones :-) + + - Removed all the USE_64BIT stuff; we now just auto-detect compilation mode. + As requested by many callers to the show. + + - Fixed rare problems with programs that use snippets of assembly and + switch between .code32 and .code64. Addresses a glitch spotted by + Hanno Boeck with compiling ToT gdb. + +### Version 0.45b: + + - Implemented a test case trimmer. Results in 20-30% size reduction for many + types of work loads, with very pronounced improvements in path discovery + speeds. + + - Added better warnings for various problems with input directories. + + - Added a Makefile warning for older copies, based on counterintuitive + behavior observed by Hovik Manucharyan. + + - Added fuzzer_stats file for status monitoring. Suggested by @dronesec. + + - Fixed moar typos, thanks to Alexander Cherepanov. + + - Implemented better warnings for ASAN memory requirements, based on calls + from several angry listeners. + + - Switched to saner behavior with non-tty stdout (less output generated, + no ANSI art). + +### Version 0.44b: + + - Added support for AFL_CC and AFL_CXX, based on a patch from Ben Laurie. + + - Replaced afl-fuzz -S -D with -M for simplicity. + + - Added a check for .section .text; lack of this prevented main() from + getting instrumented for some users. Reported by Tom Ritter. + + - Reorganized the testcases/ directory. + + - Added an extra check to confirm that the build is operational. + + - Made more consistent use of color reset codes, as suggested by Oliver + Kunz. + +### Version 0.43b: + + - Fixed a bug with 64-bit gcc -shared relocs. + + - Removed echo -e from Makefile for compatibility with dash. Suggested + by Jakub Wilk. + + - Added status_screen.txt. + + - Added examples/canvas_harness. + + - Made a minor change to the Makefile GCC check. Suggested by Hanno Boeck. + +### Version 0.42b: + + - Fixed a bug with red zone handling for 64-bit (oops!). Problem reported by + Felix Groebert. + + - Implemented horribly experimental ARM support in examples/arm_support. + + - Made several improvements to error messages. + + - Added AFL_QUIET to silence afl-gcc and afl-as when using wonky build + systems. Reported by Hanno Boeck. + + - Improved check for 64-bit compilation, plus several sanity checks + in Makefile. + +### Version 0.41b: + + - Fixed a fork served bug for processes that call execve(). + + - Made minor compatibility fixes to Makefile, afl-gcc; suggested by Jakub + Wilk. + + - Fixed triage_crashes.sh to work with the new layout of output directories. + Suggested by Jakub Wilk. + + - Made multiple performance-related improvements to the injected + instrumentation. + + - Added visual indication of the number of imported paths. + + - Fixed afl-showmap to make it work well with new instrumentation. + + - Added much better error messages for crashes when importing test cases + or otherwise calibrating the binary. + +### Version 0.40b: + + - Added support for parallelized fuzzing. Inspired by earlier patch + from Sebastian Roschke. + + - Added an example in examples/distributed_fuzzing/. + +### Version 0.39b: + + - Redesigned status screen, now 90% more spiffy. + + - Added more verbose and user-friendly messages for some common problems. + + - Modified the resumption code to reconstruct path depth. + + - Changed the code to inhibit core dumps and improve the ability to detect + SEGVs. + + - Added a check for redirection of core dumps to programs. + + - Made a minor improvement to the handling of variable paths. + + - Made additional performance tweaks to afl-fuzz, chiefly around mem limits. + + - Added performance_tips.txt. + +### Version 0.38b: + + - Fixed an fd leak and +cov tracking bug resulting from changes in 0.37b. + + - Implemented auto-scaling for screen update speed. + + - Added a visual indication when running in non-instrumented mode. + +### Version 0.37b: + + - Added fuzz state tracking for more seamless resumption of aborted + fuzzing sessions. + + - Removed the -D option, as it's no longer necessary. + + - Refactored calibration code and improved startup reporting. + + - Implemented dynamically scaled timeouts, so that you don't need to + play with -t except in some very rare cases. + + - Added visual notification for slow binaries. + + - Improved instrumentation to explicitly cover the other leg of every + branch. + +### Version 0.36b: + + - Implemented fork server support to avoid the overhead of execve(). A + nearly-verbatim design from Jann Horn; still pending part 2 that would + also skip initial setup steps (thinking about reliable heuristics now). + + - Added a check for shell scripts used as fuzz targets. + + - Added a check for fuzz jobs that don't seem to be finding anything. + + - Fixed the way IGNORE_FINDS works (was a bit broken after adding splicing + and path skip heuristics). + +### Version 0.35b: + + - Properly integrated 64-bit instrumentation into afl-as. + +### Version 0.34b: + + - Added a new exec count classifier (the working theory is that it gets + meaningful coverage with fewer test cases spewed out). + +### Version 0.33b: + + - Switched to new, somewhat experimental instrumentation that tries to + target only arcs, rather than every line. May be fragile, but is a lot + faster (2x+). + + - Made several other cosmetic fixes and typo corrections, thanks to + Jakub Wilk. + +### Version 0.32b: + + - Another take at fixing the C++ exception thing. Reported by Jakub Wilk. + +### Version 0.31b: + + - Made another fix to afl-as to address a potential problem with newer + versions of GCC (introduced in 0.28b). Thanks to Jann Horn. + +### Version 0.30b: + + - Added more detail about the underlying operations in file names. + +### Version 0.29b: + + - Made some general improvements to chunk operations. + +### Version 0.28b: + + - Fixed C++ exception handling in newer versions of GCC. Problem diagnosed + by Eberhard Mattes. + + - Fixed the handling of the overflow flag. Once again, thanks to + Eberhard Mattes. + +### Version 0.27b: + + - Added prioritization of new paths over the already-fuzzed ones. + + - Included spliced test case ID in the output file name. + + - Fixed a rare, cosmetic null ptr deref after Ctrl-C. + + - Refactored the code to make copies of test cases in the output directory. + + - Switched to better output file names, keeping track of stage and splicing + sources. + +### Version 0.26b: + + - Revamped storage of testcases, -u option removed, + + - Added a built-in effort minimizer to get rid of potentially redundant + inputs, + + - Provided a testcase count minimization script in examples/, + + - Made miscellaneous improvements to directory and file handling. + + - Fixed a bug in timeout detection. + +### Version 0.25b: + + - Improved count-based instrumentation. + + - Improved the hang deduplication logic. + + - Added -cov prefixes for test cases. + + - Switched from readdir() to scandir() + alphasort() to preserve ordering of + test cases. + + - Added a splicing strategy. + + - Made various minor UI improvements and several other bugfixes. + +### Version 0.24b: + + - Added program name to the status screen, plus the -T parameter to go with + it. + +### Version 0.23b: + + - Improved the detection of variable behaviors. + + - Added path depth tracking, + + - Improved the UI a bit, + + - Switched to simplified (XOR-based) tuple instrumentation. + +### Version 0.22b: + + - Refactored the handling of long bitflips and some swaps. + + - Fixed the handling of gcc -pipe, thanks to anonymous reporter. + +### Version 0.21b (2013-11-12): + + - Initial public release. |