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documentation for AFL_PERSISTENT_RECORD

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vanhauser-thc
2021-03-07 08:43:01 +01:00
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9
docs/env_variables.md
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@ -400,6 +400,15 @@ checks or alter some of the more exotic semantics of the tool:
- Setting `AFL_FORCE_UI` will force painting the UI on the screen even if - Setting `AFL_FORCE_UI` will force painting the UI on the screen even if
no valid terminal was detected (for virtual consoles) no valid terminal was detected (for virtual consoles)
- If you are using persistent mode (you should, see [instrumentation/README.persistent_mode.md](instrumentation/README.persistent_mode.md))
some targets keep inherent state due which a detected crash testcase does
not crash the target again when the testcase is given. To be able to still
re-trigger these crashes you can use the `AFL_PERSISTENT_RECORD` variable
with a value of how many previous fuzz cases to keep prio a crash.
if set to e.g. 10, then the 9 previous inputs are written to
out/default/crashes as RECORD:000000,cnt:000000 to RECORD:000000,cnt:000008
and RECORD:000000,cnt:000009 being the crash case.
- If you are Jakub, you may need `AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES`. - If you are Jakub, you may need `AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES`.
Others need not apply. Others need not apply.

1
src/afl-fuzz.c
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@ -218,6 +218,7 @@ static void usage(u8 *argv0, int more_help) {
"AFL_PATH: path to AFL support binaries\n" "AFL_PATH: path to AFL support binaries\n"
"AFL_PYTHON_MODULE: mutate and trim inputs with the specified Python module\n" "AFL_PYTHON_MODULE: mutate and trim inputs with the specified Python module\n"
"AFL_QUIET: suppress forkserver status messages\n" "AFL_QUIET: suppress forkserver status messages\n"
"AFL_PERSISTENT_RECORD: record the last X inputs to every crash in out/crashes\n"
"AFL_PRELOAD: LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n" "AFL_PRELOAD: LD_PRELOAD / DYLD_INSERT_LIBRARIES settings for target\n"
"AFL_SHUFFLE_QUEUE: reorder the input queue randomly on startup\n" "AFL_SHUFFLE_QUEUE: reorder the input queue randomly on startup\n"
"AFL_SKIP_BIN_CHECK: skip the check, if the target is an executable\n" "AFL_SKIP_BIN_CHECK: skip the check, if the target is an executable\n"