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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/Changelog.md | 51 | ||||
| -rw-r--r-- | docs/env_variables.md | 36 | ||||
| -rw-r--r-- | docs/ideas.md | 49 | ||||
| -rw-r--r-- | docs/rpc_statsd.md | 143 | ||||
| -rw-r--r-- | docs/statsd/grafana-afl++.json | 1816 | ||||
| -rw-r--r-- | docs/visualization/statsd-grafana.png | bin | 0 -> 163646 bytes |
6 files changed, 2065 insertions, 30 deletions
diff --git a/docs/Changelog.md b/docs/Changelog.md index 60f09ca5..e2482f8f 100644 --- a/docs/Changelog.md +++ b/docs/Changelog.md @@ -11,31 +11,64 @@ sending a mail to <afl-users+subscribe@googlegroups.com>. ### Version ++3.01a (dev) - Mac OS ARM64 support - - New selective instrumentation option with __AFL_COVERAGE_... commands + - Android support fixed and updated by Joey Jiaojg - thanks! + - New selective instrumentation option with __AFL_COVERAGE_* commands to be placed in the source code. Check out instrumentation/README.instrument_list.md - afl-fuzz + - Making AFL_MAP_SIZE (mostly) obsolete - afl-fuzz now learns on start + the target map size + - upgraded cmplog/redqueen: solving for floating point, solving + transformations (e.g. toupper, tolower, to/from hex, xor, + arithmetics, etc.). This is costly hence new command line option + `-l` that sets the intensity (values 1 to 3). Recommended is 1 or 2. + - added `AFL_CMPLOG_ONLY_NEW` to not use cmplog on initial testcases from + `-i` or resumes (as these have most likely already been done) - fix crash for very, very fast targets+systems (thanks to mhlakhani for reporting) - - if determinstic mode is active (-D, or -M without -d) then we sync + - on restarts (`-i`)/autoresume (AFL_AUTORESUME) the stats are now + reloaded and used, thanks to Vimal Joseph for this patch! + - if deterministic mode is active (`-D`, or `-M` without `-d`) then we sync after every queue entry as this can take very long time otherwise - better detection if a target needs a large shared map - - switched to a faster RNG + - fix for `-Z` + - switched to an even faster RNG - added hghwng's patch for faster trace map analysis - afl-cc - allow instrumenting LLVMFuzzerTestOneInput - fixed endless loop for allow/blocklist lines starting with a comment (thanks to Zherya for reporting) - - cmplog/redqueen now also tracks floats/doubles + - cmplog/redqueen now also tracks floating point, _ExtInt() + 128bit + - cmplog/redqueen can now process basic libc++ and libstdc++ + std::string comparisons (though no position or length type variants) + - added support for __afl_coverage_interesting() for LTO and + and our own PCGUARD (llvm 10.0.1+), read more about this function + and selective coverage in instrumentation/README.instrument_list.md - added AFL_LLVM_INSTRUMENT option NATIVE for native clang pc-guard support (less performant than our own), GCC for old afl-gcc and CLANG for old afl-clang - - warn on any _AFL and __AFL env var - - LLVM mode is now compiled with -j4, unicorn with all cores. qemu was - already building with all cores, the gcc plugin needs only one. + - fixed a potential crash in the LAF feature + - workaround for llvm 13 + - workaround for llvm internal lto bug that lets not bitcast from _ExtInt() + - qemuafl + - QASan (address sanitizer for Qemu) ported to qemuafl! + See qemu_mode/libqasan/README.md + - solved some persistent mode bugs (thanks Dil4rd) + - solved an issue when dumping the memory maps (thanks wizche) + - Android support for QASan + - unicornafl + - Substantial speed gains in python bindings for certain use cases + - Improved rust bindings + - Added a new example harness to compare python, c, and rust bindings + - afl-cmin and afl-showmap now support the -f option + - changed default: no memory limit for afl-cmin and afl-cmin.bash + - warn on any _AFL and __AFL env vars. + - set AFL_IGNORE_UNKNOWN_ENVS to not warn on unknown AFL_... env vars. - added dummy Makefile to instrumentation/ - - Updated utils/afl_frida to be 5% faster - - Added AFL_KILL_SIGNAL env variable for custom targets (thanks @v-p-b) + - Updated utils/afl_frida to be 5% faster, 7% on x86_x64 + - Added AFL_KILL_SIGNAL env variable (thanks @v-p-b) + - @Edznux added a nice documentation on how to use rpc.statsd with + afl++ in docs/rpc_statsd.md, thanks! ### Version ++3.00c (release) - llvm_mode/ and gcc_plugin/ moved to instrumentation/ diff --git a/docs/env_variables.md b/docs/env_variables.md index 26128b01..f6ed12d0 100644 --- a/docs/env_variables.md +++ b/docs/env_variables.md @@ -5,6 +5,10 @@ users or for some types of custom fuzzing setups. See [README.md](README.md) for the general instruction manual. + Note that most tools will warn on any unknown AFL environment variables. + This is for warning on typos that can happen. If you want to disable this + check then set the `AFL_IGNORE_UNKNOWN_ENVS` environment variable. + ## 1) Settings for all compilers Starting with afl++ 3.0 there is only one compiler: afl-cc @@ -18,7 +22,6 @@ To select the different instrumentation modes this can be done by `MODE` can be one of `LTO` (afl-clang-lto*), `LLVM` (afl-clang-fast*), `GCC_PLUGIN` (afl-g*-fast) or `GCC` (afl-gcc/afl-g++). - Because (with the exception of the --afl-MODE command line option) the compile-time tools do not accept afl specific command-line options, they make fairly broad use of environmental variables instead: @@ -287,6 +290,11 @@ checks or alter some of the more exotic semantics of the tool: the target. This must be equal or larger than the size the target was compiled with. + - `AFL_CMPLOG_ONLY_NEW` will only perform the expensive cmplog feature for + newly found testcases and not for testcases that are loaded on startup + (`-i in`). This is an important feature to set when resuming a fuzzing + session. + - `AFL_TESTCACHE_SIZE` allows you to override the size of `#define TESTCASE_CACHE` in config.h. Recommended values are 50-250MB - or more if your fuzzing finds a huge amount of paths for large inputs. @@ -431,13 +439,19 @@ checks or alter some of the more exotic semantics of the tool: normally done when starting up the forkserver and causes a pretty significant performance drop. - - Setting `AFL_STATSD` enable StatsD metrics collection. + - Setting `AFL_STATSD` enables StatsD metrics collection. By default AFL++ will send these metrics over UDP to 127.0.0.1:8125. - The host and port are configurable with `AFL_STATSD_HOST` and `AFL_STATSD_PORT` - respectively. - To get the most out of this, you should provide `AFL_STATSD_TAGS_FLAVOR` that - matches your StatsD server. - Available flavors are `dogstatsd`, `librato`, `signalfx` and `influxdb`. + The host and port are configurable with `AFL_STATSD_HOST` and `AFL_STATSD_PORT` respectively. + To enable tags (banner and afl_version) you should provide `AFL_STATSD_TAGS_FLAVOR` that matches + your StatsD server (see `AFL_STATSD_TAGS_FLAVOR`) + + - Setting `AFL_STATSD_TAGS_FLAVOR` to one of `dogstatsd`, `librato`, `signalfx` or `influxdb` + allows you to add tags to your fuzzing instances. This is especially useful when running + multiple instances (`-M/-S` for example). Applied tags are `banner` and `afl_version`. + `banner` corresponds to the name of the fuzzer provided through `-M/-S`. + `afl_version` corresponds to the currently running afl version (e.g `++3.0c`). + Default (empty/non present) will add no tags to the metrics. + See [rpc_statsd.md](rpc_statsd.md) for more information. - Setting `AFL_CRASH_EXITCODE` sets the exit code afl treats as crash. For example, if `AFL_CRASH_EXITCODE='-1'` is set, each input resulting @@ -504,6 +518,12 @@ The QEMU wrapper used to instrument binary-only code supports several settings: stack pointer in which QEMU can find the return address when `start addr` is hit. + - With `AFL_USE_QASAN` you can enable QEMU AddressSanitizer for dynamically + linked binaries. + + - With `AFL_QEMU_FORCE_DFL` you force QEMU to ignore the registered signal + handlers of the target. + ## 6) Settings for afl-cmin The corpus minimization script offers very little customization: @@ -519,7 +539,7 @@ The corpus minimization script offers very little customization: a modest security risk on multi-user systems with rogue users, but should be safe on dedicated fuzzing boxes. -# #6) Settings for afl-tmin +## 7) Settings for afl-tmin Virtually nothing to play with. Well, in QEMU mode (`-Q`), `AFL_PATH` will be searched for afl-qemu-trace. In addition to this, `TMPDIR` may be used if a diff --git a/docs/ideas.md b/docs/ideas.md index aaa3eed1..08cb16ef 100644 --- a/docs/ideas.md +++ b/docs/ideas.md @@ -3,6 +3,40 @@ In the following, we describe a variety of ideas that could be implemented for future AFL++ versions. +# GSoC 2021 + +All GSoC 2021 projects will be in the Rust development language! + +## UI for libaflrs + +Write a user interface to libaflrs, the upcoming backend of afl++. +This might look like the afl-fuzz UI, but you can improve on it - and should! + +## Schedulers for libaflrs + +Schedulers is a mechanism that selects items from the fuzzing corpus based +on strategy and randomness. One scheduler might focus on long paths, +another on rarity of edges disocvered, still another on a combination on +things. Some of the schedulers in afl++ have to be ported, but you are free +to come up with your own if you want to - and see how it performs. + +## Forkserver support for libaflrs + +The current libaflrs implementation fuzzes in-memory, however obviously we +want to support afl instrumented binaries as well. +Hence a forkserver support needs to be implemented - forking off the target +and talking to the target via a socketpair and the communication protocol +within. + +## More Observers for libaflrs + +An observer is measuring functionality that looks at the target being fuzzed +and documents something about it. In traditional fuzzing this is the coverage +in the target, however we want to add various more observers, e.g. stack depth, +heap usage, etc. - this is a topic for an experienced Rust developer. + +# Generic ideas and wishlist + ## Analysis software Currently analysis is done by using afl-plot, which is rather outdated. @@ -16,6 +50,8 @@ test cases executed. It should be clickable which value is X and Y axis, zoom factor, log scaling on-off, etc. +Mentor: vanhauser-thc + ## WASM Instrumentation Currently, AFL++ can be used for source code fuzzing and traditional binaries. @@ -36,19 +72,6 @@ Either improve a single mutator thorugh learning of many different bugs Mentor: domenukk -## Collision-free Binary-Only Maps - -AFL++ supports collison-free maps using an LTO (link-time-optimization) pass. -This should be possible to implement for QEMU and Unicorn instrumentations. -As the forkserver parent caches just in time translated translation blocks, -adding a simple counter between jumps should be doable. - -Note: this is already in development for qemu by Andrea, so for people who -want to contribute it might make more sense to port his solution to unicorn. - -Mentor: andreafioraldi or domenukk -Issue/idea tracker: [https://github.com/AFLplusplus/AFLplusplus/issues/237](https://github.com/AFLplusplus/AFLplusplus/issues/237) - ## Your idea! Finally, we are open to proposals! diff --git a/docs/rpc_statsd.md b/docs/rpc_statsd.md new file mode 100644 index 00000000..fb97aa09 --- /dev/null +++ b/docs/rpc_statsd.md @@ -0,0 +1,143 @@ +# Remote monitoring with StatsD + +StatsD allows you to receive and aggregate metrics from a wide range of applications and retransmit them to the backend of your choice. +This enables you to create nice and readable dashboards containing all the information you need on your fuzzer instances. +No need to write your own statistics parsing system, deploy and maintain it to all your instances, sync with your graph rendering system... + +The available metrics are : +- cycle_done +- cycles_wo_finds +- execs_done +- execs_per_sec +- paths_total +- paths_favored +- paths_found +- paths_imported +- max_depth +- cur_path +- pending_favs +- pending_total +- variable_paths +- unique_crashes +- unique_hangs +- total_crashes +- slowest_exec_ms +- edges_found +- var_byte_count +- havoc_expansion + +Compared to the default integrated UI, these metrics give you the opportunity to visualize trends and fuzzing state over time. +By doing so, you might be able to see when the fuzzing process has reached a state of no progress, visualize what are the "best strategies" +(according to your own criteria) for your targets, etc. And doing so without requiring to log into each instance manually. + +An example visualisation may look like the following: + + +*Notes: The exact same dashboard can be imported with [this JSON template](statsd/grafana-afl++.json).* + +## How to use + +To enable the StatsD reporting on your fuzzer instances, you need to set the environment variable `AFL_STATSD=1`. + +Setting `AFL_STATSD_TAGS_FLAVOR` to the provider of your choice will assign tags / labels to each metric based on their format. +The possible values are `dogstatsd`, `librato`, `signalfx` or `influxdb`. +For more information on these env vars, check out `docs/env_variables.md`. + +The simplest way of using this feature is to use any metric provider and change the host/port of your StatsD daemon, +with `AFL_STATSD_HOST` and `AFL_STATSD_PORT`, if required (defaults are `localhost` and port `8125`). +To get started, here are some instructions with free and open source tools. +The following setup is based on Prometheus, statsd_exporter and Grafana. +Grafana here is not mandatory, but gives you some nice graphs and features. + +Depending on your setup and infrastructure, you may want to run these applications not on your fuzzer instances. +Only one instance of these 3 application is required for all your fuzzers. + +To simplify everything, we will use Docker and docker-compose. +Make sure you have them both installed. On most common Linux distributions, it's as simple as: + +```sh +curl -fsSL https://get.docker.com -o get-docker.sh +sh get-docker.sh +``` + +Once that's done, we can create the infrastructure. +Create and move into the directory of your choice. This will store all the configurations files required. + +First, create a `docker-compose.yml` containing the following: +```yml +version: '3' + +networks: + statsd-net: + driver: bridge + +services: + prometheus: + image: prom/prometheus + container_name: prometheus + volumes: + - ./prometheus.yml:/prometheus.yml + command: + - '--config.file=/prometheus.yml' + restart: unless-stopped + ports: + - "9090:9090" + networks: + - statsd-net + + statsd_exporter: + image: prom/statsd-exporter + container_name: statsd_exporter + volumes: + - ./statsd_mapping.yml:/statsd_mapping.yml + command: + - "--statsd.mapping-config=/statsd_mapping.yml" + ports: + - "9102:9102/tcp" + - "8125:9125/udp" + networks: + - statsd-net + + grafana: + image: grafana/grafana + container_name: grafana + restart: unless-stopped + ports: + - "3000:3000" + networks: + - statsd-net +``` + +Then `prometheus.yml` +```yml +global: + scrape_interval: 15s + evaluation_interval: 15s + +scrape_configs: + - job_name: 'fuzzing_metrics' + static_configs: + - targets: ['statsd_exporter:9102'] +``` + +And finally `statsd_mapping.yml` +```yml +mappings: +- match: "fuzzing.*" + name: "fuzzing" + labels: + type: "$1" +``` + +Run `docker-compose up -d`. + +Everything should now be setup, you are now able to run your fuzzers with + +``` +AFL_STATSD_TAGS_FLAVOR=dogstatsd AFL_STATSD=1 afl-fuzz -M test-fuzzer-1 -i i -o o ./bin/my-application @@ +AFL_STATSD_TAGS_FLAVOR=dogstatsd AFL_STATSD=1 afl-fuzz -S test-fuzzer-2 -i i -o o ./bin/my-application @@ +... +``` + +This setup may be modified before use in a production environment. Depending on your needs: adding passwords, creating volumes for storage, +tweaking the metrics gathering to get host metrics (CPU, RAM ...). diff --git a/docs/statsd/grafana-afl++.json b/docs/statsd/grafana-afl++.json new file mode 100644 index 00000000..96e824de --- /dev/null +++ b/docs/statsd/grafana-afl++.json @@ -0,0 +1,1816 @@ +{ + "annotations": { + "list": [ + { + "builtIn": 1, + "datasource": "-- Grafana --", + "enable": true, + "hide": true, + "iconColor": "rgba(0, 211, 255, 1)", + "name": "Annotations & Alerts", + "type": "dashboard" + } + ] + }, + "editable": true, + "gnetId": null, + "graphTooltip": 0, + "id": 1, + "links": [], + "panels": [ + { + "datasource": null, + "gridPos": { + "h": 1, + "w": 24, + "x": 0, + "y": 0 + }, + "id": 16, + "title": "Row title", + "type": "row" + }, + { + "alert": { + "alertRuleTags": {}, + "conditions": [ + { + "evaluator": { + "params": [ + 500 + ], + "type": "lt" + }, + "operator": { + "type": "and" + }, + "query": { + "params": [ + "A", 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