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* sync (#886) * Create FUNDING.yml * Update FUNDING.yml * moved custom_mutator examples * unicorn speedtest makefile cleanup * fixed example location * fix qdbi * update util readme * Frida persistent (#880) * Added x64 support for persistent mode (function call only), in-memory teest cases and complog * Review changes, fix NeverZero and code to parse the .text section of the main executable. Excluded ranges TBC * Various minor fixes and finished support for AFL_INST_LIBS * Review changes Co-authored-by: Your Name <you@example.com> * nits * fix frida mode * Integer overflow/underflow fixes in libdislocator (#889) * libdislocator: fixing integer overflow in 'max_mem' variable and setting 'max_mem' type to 'size_t' * libdislocator: fixing potential integer underflow in 'total_mem' variable due to its different values in different threads * Bumped warnings up to the max and fixed remaining issues (#890) Co-authored-by: Your Name <you@example.com> * nits * frida mode - support non-pie * nits * nit * update grammar mutator * Fixes for aarch64, OSX and other minor issues (#891) Co-authored-by: Your Name <you@example.com> * nits * nits * fix PCGUARD, build aflpp_driver with fPIC * Added representative fuzzbench test and test for libxml (#893) * Added representative fuzzbench test and test for libxml * Added support for building FRIDA from source with FRIDA_SOURCE=1 Co-authored-by: Your Name <you@example.com> * nits * update changelog * typos * fixed potential double free in custom trim (#881) * error handling, freeing mem * frida: complog -> cmplog * fix statsd writing * let aflpp_qemu_driver_hook.so build fail gracefully * fix stdin trimming * Support for AFL_ENTRYPOINT (#898) Co-authored-by: Your Name <you@example.com> * remove the input file .cur_input at the end of the fuzzing, if AFL_TMPDIR is used * reverse push (#901) * Create FUNDING.yml * Update FUNDING.yml * disable QEMU static pie Co-authored-by: Andrea Fioraldi <andreafioraldi@gmail.com> * clarify that no modifications are required. * add new test for frida_mode (please review) * typos * fix persistent mode (64-bit) * set ARCH for linux intel 32-bit for frida-gum-devkit * prepare for 32-bit support (later) * not on qemu 3 anymore * unicorn mips fixes * instrumentation further move to C++11 (#900) * unicorn fixes * more unicorn fixes * Fix memory errors when trim causes testcase growth (#881) (#903) * Revert "fixed potential double free in custom trim (#881)" This reverts commit e9d2f72382cab75832721d859c3e731da071435d. * Revert "fix custom trim for increasing data" This reverts commit 86a8ef168dda766d2f25f15c15c4d3ecf21d0667. * Fix memory errors when trim causes testcase growth Modify trim_case_custom to avoid writing into in_buf because some custom mutators can cause the testcase to grow rather than shrink. Instead of modifying in_buf directly, we write the update out to the disk when trimming is complete, and then the caller is responsible for refreshing the in-memory buffer from the file. This is still a bit sketchy because it does need to modify q->len in order to notify the upper layers that something changed, and it could end up telling upper layer code that the q->len is *bigger* than the buffer (q->testcase_buf) that contains it, which is asking for trouble down the line somewhere... * Fix an unlikely situation Put back some `unlikely()` calls that were in the e9d2f72382cab75832721d859c3e731da071435d commit that was reverted. * typo * Exit on time (#904) * Variable AFL_EXIT_ON_TIME description has been added. Variables AFL_EXIT_ON_TIME and afl_exit_on_time has been added. afl->exit_on_time variable initialization has been added. The asignment of a value to the afl->afl_env.afl_exit_on_time variable from environment variables has been added. Code to exit on timeout if new path not found has been added. * Type of afl_exit_on_time variable has been changed. Variable exit_on_time has been added to the afl_state_t structure. * Command `export AFL_EXIT_WHEN_DONE=1` has been added. * Millisecond to second conversion has been added. Call get_cur_time() has been added. * Revert to using the saved current time value. * Useless check has been removed. * fix new path to custom-mutators * ensure crashes/README.txt exists * fix * Changes to bump FRIDA version and to clone FRIDA repo in to build directory rather than use a submodule as the FRIDA build scripts don't like it (#906) Co-authored-by: Your Name <you@example.com> * Fix numeric overflow in cmplog implementation (#907) Co-authored-by: Your Name <you@example.com> * testcase fixes for unicorn * remove merge conflict artifacts * fix afl-plot * Changes to remove binaries from frida_mode (#913) Co-authored-by: Your Name <you@example.com> * Frida cmplog fail fast (#914) * Changes to remove binaries from frida_mode * Changes to make cmplog fail fast Co-authored-by: Your Name <you@example.com> * afl-plot: relative time * arch linux and mac os support for afl-system-config * typo * code-format * update documentation * github workflow for qemu * OSX-specific improvements (#912) * Fix afl-cc to work correctly by default on OSX using xcode - CLANG_ENV_VAR must be set for afl-as to work - Use clang mode by default if no specific compiler selected * Add OSX-specific documentation for configuring shared memory * Fixes to memory operands for complog (#916) Co-authored-by: Your Name <you@example.com> * fix a few cur_time uses * added bounds check to pivot_inputs (fixes #921) * additional safety checks for restarts * restrict afl-showmap in_file size * fix seed crash disable * add warning for afl-showmap partial read * no core dumps * AFL_PRINT_FILENAMES added * more documentation for AFL_EXIT_ON_TIME * Flushing for AFL_PRINT_FILENAMES * FASAN Support (#918) * FASAN Support * Fix handling of Address Sanitizer DSO * Changes to identification of Address Sanitizer DSO Co-authored-by: Your Name <you@example.com> * Support for x86 (#920) Co-authored-by: Your Name <you@example.com> * Update frida_mode readme (#925) * libqasan: use syscalls for read and write * update readme * Minor integration tweaks (#926) Co-authored-by: Your Name <you@example.com> * merge * fix afl-fuzz.c frida preload * cleaned up AFL_PRINT_FILENAMES env * Changes to have persistent mode exit at the end of the loop (#928) Co-authored-by: Your Name <you@example.com> * fix llvm-dict2file * push to stable (#931) (#932) * sync (#886) * Create FUNDING.yml * Update FUNDING.yml * moved custom_mutator examples * unicorn speedtest makefile cleanup * fixed example location * fix qdbi * update util readme * Frida persistent (#880) * Added x64 support for persistent mode (function call only), in-memory teest cases and complog * Review changes, fix NeverZero and code to parse the .text section of the main executable. Excluded ranges TBC * Various minor fixes and finished support for AFL_INST_LIBS * Review changes Co-authored-by: Your Name <you@example.com> * nits * fix frida mode * Integer overflow/underflow fixes in libdislocator (#889) * libdislocator: fixing integer overflow in 'max_mem' variable and setting 'max_mem' type to 'size_t' * libdislocator: fixing potential integer underflow in 'total_mem' variable due to its different values in different threads * Bumped warnings up to the max and fixed remaining issues (#890) Co-authored-by: Your Name <you@example.com> * nits * frida mode - support non-pie * nits * nit * update grammar mutator * Fixes for aarch64, OSX and other minor issues (#891) Co-authored-by: Your Name <you@example.com> * nits * nits * fix PCGUARD, build aflpp_driver with fPIC * Added representative fuzzbench test and test for libxml (#893) * Added representative fuzzbench test and test for libxml * Added support for building FRIDA from source with FRIDA_SOURCE=1 Co-authored-by: Your Name <you@example.com> * nits * update changelog * typos * fixed potential double free in custom trim (#881) * error handling, freeing mem * frida: complog -> cmplog * fix statsd writing * let aflpp_qemu_driver_hook.so build fail gracefully * fix stdin trimming * Support for AFL_ENTRYPOINT (#898) Co-authored-by: Your Name <you@example.com> * remove the input file .cur_input at the end of the fuzzing, if AFL_TMPDIR is used * reverse push (#901) * Create FUNDING.yml * Update FUNDING.yml * disable QEMU static pie Co-authored-by: Andrea Fioraldi <andreafioraldi@gmail.com> * clarify that no modifications are required. * add new test for frida_mode (please review) * typos * fix persistent mode (64-bit) * set ARCH for linux intel 32-bit for frida-gum-devkit * prepare for 32-bit support (later) * not on qemu 3 anymore * unicorn mips fixes * instrumentation further move to C++11 (#900) * unicorn fixes * more unicorn fixes * Fix memory errors when trim causes testcase growth (#881) (#903) * Revert "fixed potential double free in custom trim (#881)" This reverts commit e9d2f72382cab75832721d859c3e731da071435d. * Revert "fix custom trim for increasing data" This reverts commit 86a8ef168dda766d2f25f15c15c4d3ecf21d0667. * Fix memory errors when trim causes testcase growth Modify trim_case_custom to avoid writing into in_buf because some custom mutators can cause the testcase to grow rather than shrink. Instead of modifying in_buf directly, we write the update out to the disk when trimming is complete, and then the caller is responsible for refreshing the in-memory buffer from the file. This is still a bit sketchy because it does need to modify q->len in order to notify the upper layers that something changed, and it could end up telling upper layer code that the q->len is *bigger* than the buffer (q->testcase_buf) that contains it, which is asking for trouble down the line somewhere... * Fix an unlikely situation Put back some `unlikely()` calls that were in the e9d2f72382cab75832721d859c3e731da071435d commit that was reverted. * typo * Exit on time (#904) * Variable AFL_EXIT_ON_TIME description has been added. Variables AFL_EXIT_ON_TIME and afl_exit_on_time has been added. afl->exit_on_time variable initialization has been added. The asignment of a value to the afl->afl_env.afl_exit_on_time variable from environment variables has been added. Code to exit on timeout if new path not found has been added. * Type of afl_exit_on_time variable has been changed. Variable exit_on_time has been added to the afl_state_t structure. * Command `export AFL_EXIT_WHEN_DONE=1` has been added. * Millisecond to second conversion has been added. Call get_cur_time() has been added. * Revert to using the saved current time value. * Useless check has been removed. * fix new path to custom-mutators * ensure crashes/README.txt exists * fix * Changes to bump FRIDA version and to clone FRIDA repo in to build directory rather than use a submodule as the FRIDA build scripts don't like it (#906) Co-authored-by: Your Name <you@example.com> * Fix numeric overflow in cmplog implementation (#907) Co-authored-by: Your Name <you@example.com> * testcase fixes for unicorn * remove merge conflict artifacts * fix afl-plot * Changes to remove binaries from frida_mode (#913) Co-authored-by: Your Name <you@example.com> * Frida cmplog fail fast (#914) * Changes to remove binaries from frida_mode * Changes to make cmplog fail fast Co-authored-by: Your Name <you@example.com> * afl-plot: relative time * arch linux and mac os support for afl-system-config * typo * code-format * update documentation * github workflow for qemu * OSX-specific improvements (#912) * Fix afl-cc to work correctly by default on OSX using xcode - CLANG_ENV_VAR must be set for afl-as to work - Use clang mode by default if no specific compiler selected * Add OSX-specific documentation for configuring shared memory * Fixes to memory operands for complog (#916) Co-authored-by: Your Name <you@example.com> * fix a few cur_time uses * added bounds check to pivot_inputs (fixes #921) * additional safety checks for restarts * restrict afl-showmap in_file size * fix seed crash disable * add warning for afl-showmap partial read * no core dumps * AFL_PRINT_FILENAMES added * more documentation for AFL_EXIT_ON_TIME * Flushing for AFL_PRINT_FILENAMES * FASAN Support (#918) * FASAN Support * Fix handling of Address Sanitizer DSO * Changes to identification of Address Sanitizer DSO Co-authored-by: Your Name <you@example.com> * Support for x86 (#920) Co-authored-by: Your Name <you@example.com> * Update frida_mode readme (#925) * libqasan: use syscalls for read and write * update readme * Minor integration tweaks (#926) Co-authored-by: Your Name <you@example.com> * merge * fix afl-fuzz.c frida preload * cleaned up AFL_PRINT_FILENAMES env * Changes to have persistent mode exit at the end of the loop (#928) Co-authored-by: Your Name <you@example.com> * fix llvm-dict2file Co-authored-by: Dominik Maier <domenukk@gmail.com> Co-authored-by: WorksButNotTested <62701594+WorksButNotTested@users.noreply.github.com> Co-authored-by: Your Name <you@example.com> Co-authored-by: Dmitry Zheregelya <zheregelya.d@gmail.com> Co-authored-by: hexcoder <hexcoder-@users.noreply.github.com> Co-authored-by: hexcoder- <heiko@hexco.de> Co-authored-by: Andrea Fioraldi <andreafioraldi@gmail.com> Co-authored-by: David CARLIER <devnexen@gmail.com> Co-authored-by: realmadsci <71108352+realmadsci@users.noreply.github.com> Co-authored-by: Roman M. Iudichev <SecNotice@ya.ru> Co-authored-by: Dustin Spicuzza <dustin@virtualroadside.com> Co-authored-by: Dominik Maier <domenukk@gmail.com> Co-authored-by: WorksButNotTested <62701594+WorksButNotTested@users.noreply.github.com> Co-authored-by: Your Name <you@example.com> Co-authored-by: Dmitry Zheregelya <zheregelya.d@gmail.com> Co-authored-by: hexcoder <hexcoder-@users.noreply.github.com> Co-authored-by: hexcoder- <heiko@hexco.de> Co-authored-by: Andrea Fioraldi <andreafioraldi@gmail.com> Co-authored-by: David CARLIER <devnexen@gmail.com> Co-authored-by: realmadsci <71108352+realmadsci@users.noreply.github.com> Co-authored-by: Roman M. Iudichev <SecNotice@ya.ru> Co-authored-by: Dustin Spicuzza <dustin@virtualroadside.com> * improve error msg * Added documentation for wine LoadLibrary workaround (#933) * Fix cmake target compilation command example (#934) - Fix typo DCMAKE_C_COMPILERC -> DCMAKE_C_COMPILER. - Add `cd build` after `mkdir build`. * showmap passes queue items in alphabetical order * added tmp files to gitignore * lenient dict parsing, no map size enum for binary fuzzing * added info about showmap queue directions * update binary-only doc * turn off map size detection if skip_bin_check is set * Typo * update docs * update afl-system-config * Set kill signal before using it in afl-showmap (#935) * fix afl-cc help output * add libafl to binary-only doc * update docs * less executions on variable paths * AFL_SKIP_CRASHES is obsolete since 3.0 * add AFL_TRY_AFFINITY * Typo * Typo * Typo/wording * tweaks * typos * fix afl-whatsup help output * fix afl-plot output * fix for MacOS * fix cmpcov doc for qemu * fix tmpfile removal * update dockerfile * Frida (#940) * Added re2 test * Added libpcap test * Fix validation of setting of ADDR_NO_RANDOMIZE * Added support for printing original and instrumented code Co-authored-by: Your Name <you@example.com> * Support for AFL_FRIDA_PERSISTENT_RET (#941) Co-authored-by: Your Name <you@example.com> * Changes to add missing exclusion of ranges (#943) Co-authored-by: Your Name <you@example.com> * add --afl-noopt to afl-cc * docs: fix link to README in QuickStartGuide (#946) * Support writing Stalker stats (#945) * Support writing Stalker stats * Fixed string handling in print functions Co-authored-by: Your Name <you@example.com> * afl-cmin help fix, aflpp_driver - + @@ support * fix for afl-showmap Co-authored-by: Dominik Maier <domenukk@gmail.com> Co-authored-by: WorksButNotTested <62701594+WorksButNotTested@users.noreply.github.com> Co-authored-by: Your Name <you@example.com> Co-authored-by: Dmitry Zheregelya <zheregelya.d@gmail.com> Co-authored-by: hexcoder <hexcoder-@users.noreply.github.com> Co-authored-by: hexcoder- <heiko@hexco.de> Co-authored-by: Andrea Fioraldi <andreafioraldi@gmail.com> Co-authored-by: David CARLIER <devnexen@gmail.com> Co-authored-by: realmadsci <71108352+realmadsci@users.noreply.github.com> Co-authored-by: Roman M. Iudichev <SecNotice@ya.ru> Co-authored-by: Dustin Spicuzza <dustin@virtualroadside.com> Co-authored-by: 0x4d5a-ctf <51098072+0x4d5a-ctf@users.noreply.github.com> Co-authored-by: Tommy Chiang <oToToT@users.noreply.github.com> Co-authored-by: buherator <buherator@silentsignal.hu> Co-authored-by: Dag Heyman Kajevic <dag.heyman@gmail.com>
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AFL quick start guide
You should read README.md - it's pretty short. If you really can't, here's how to hit the ground running:
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Compile AFL with 'make'. If build fails, see INSTALL.md for tips.
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Find or write a reasonably fast and simple program that takes data from a file or stdin, processes it in a test-worthy way, then exits cleanly. If testing a network service, modify it to run in the foreground and read from stdin. When fuzzing a format that uses checksums, comment out the checksum verification code, too.
If this is not possible (e.g. in -Q(emu) mode) then use AFL_CUSTOM_MUTATOR_LIBRARY to calculate the values with your own library.
The program must crash properly when a fault is encountered. Watch out for custom SIGSEGV or SIGABRT handlers and background processes. For tips on detecting non-crashing flaws, see section 11 in README.md .
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Compile the program / library to be fuzzed using afl-gcc. A common way to do this would be:
CC=/path/to/afl-gcc CXX=/path/to/afl-g++ ./configure --disable-shared make clean all
If program build fails, ping afl-users@googlegroups.com.
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Get a small but valid input file that makes sense to the program. When fuzzing verbose syntax (SQL, HTTP, etc), create a dictionary as described in dictionaries/README.md, too.
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If the program reads from stdin, run 'afl-fuzz' like so:
./afl-fuzz -i testcase_dir -o findings_dir --
/path/to/tested/program [...program's cmdline...]If the program takes input from a file, you can put @@ in the program's command line; AFL will put an auto-generated file name in there for you.
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Investigate anything shown in red in the fuzzer UI by promptly consulting status_screen.md.
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compile and use llvm_mode (afl-clang-fast/afl-clang-fast++) as it is way faster and has a few cool features
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There is a basic docker build with 'docker build -t aflplusplus .'
That's it. Sit back, relax, and - time permitting - try to skim through the following files:
- README.md - A general introduction to AFL,
- docs/perf_tips.md - Simple tips on how to fuzz more quickly,
- docs/status_screen.md - An explanation of the tidbits shown in the UI,
- docs/parallel_fuzzing.md - Advice on running AFL on multiple cores.