Merge pull request #607 from AFLplusplus/dev

push to stable

1 files changed, 20 insertions, 1 deletions

diff --git a/docs/env_variables.md b/docs/env_variables.md
index a36f2b4e..04ba032a 100644
--- a/docs/env_variables.md
+++ b/docs/env_variables.md
@@ -306,6 +306,14 @@ checks or alter some of the more exotic semantics of the tool:
     don't want AFL++ to spend too much time classifying that stuff and just
     rapidly put all timeouts in that bin.
 
+  - Setting `AFL_FORKSRV_INIT_TMOUT` allows you to specify a different timeout
+    to wait for the forkserver to spin up. The default is the `-t` value times
+    `FORK_WAIT_MULT` from `config.h` (usually 10), so for a `-t 100`, the
+    default would wait for `1000` milliseconds. Setting a different time here is useful
+    if the target has a very slow startup time, for example when doing
+    full-system fuzzing or emulation, but you don't want the actual runs
+    to wait too long for timeouts.
+
   - `AFL_NO_ARITH` causes AFL++ to skip most of the deterministic arithmetics.
     This can be useful to speed up the fuzzing of text-based file formats.
 
@@ -380,8 +388,12 @@ checks or alter some of the more exotic semantics of the tool:
     processing the first queue entry; and `AFL_BENCH_UNTIL_CRASH` causes it to
     exit soon after the first crash is found.
 
-  - Setting `AFL_DEBUG_CHILD_OUTPUT` will not suppress the child output.
+  - Setting `AFL_DEBUG_CHILD` will not suppress the child output.
+    This lets you see all output of the child, making setup issues obvious.
+    For example, in an unicornafl harness, you might see python stacktraces.
+    You may also see other logs that way, indicating why the forkserver won't start.
     Not pretty but good for debugging purposes.
+    Note that `AFL_DEBUG_CHILD_OUTPUT` is deprecated.
 
   - Setting `AFL_NO_CPU_RED` will not display very high cpu usages in red color.
 
@@ -389,6 +401,13 @@ checks or alter some of the more exotic semantics of the tool:
     for an existing out folder, even if a different `-i` was provided.
     Without this setting, afl-fuzz will refuse execution for a long-fuzzed out dir.
 
+  - Setting `AFL_MAX_DET_EXRAS` will change the threshold at what number of elements
+    in the `-x` dictionary and LTO autodict (combined) the probabilistic mode will
+    kick off. In probabilistic mode not all dictionary entires will be used all
+    of the times for fuzzing mutations to not slow down fuzzing.
+    The default count is `200` elements. So for the 200 + 1st element, there is a
+    1 in 201 chance, that one of the dictionary entries will not be used directly.
+
   - Setting `AFL_NO_FORKSRV` disables the forkserver optimization, reverting to
     fork + execve() call for every tested input. This is useful mostly when
     working with unruly libraries that create threads or do other crazy