Option for specifying forkserver initialization timeout via environment variable (#522)

* Addition of AFL_FORKSRV_INIT_TMOUT env var

This commit introduces a new environment variable which allows to
specify the timespan AFL should wait for initial contact with the
forkserver.

This is useful for fuzz-targets requiring a rather long setup time
before the actual fuzzing can be started (e.g., unicorn).

* add .swp files to .gitignore

* Inherit init_tmout in afl_fsrv_init_dup

Without this patch, the forkserver would spawn with a timeout of 0 in
cmplog mode, leading to an immediate crash.

Additionally, this commit removes a spurious whitespace.

* Initialize afl->fsrv.init_tmout in afl_fsrv_init

Not all afl-components will need the new AFL_FORKSRV_INIT_TMOUT
environment variable. Hence, it's initialized to the safe "default"
value from before in afl_fsrv_init now.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/forkserver.h b/include/forkserver.h
index d824c1c9..300ecffc 100644
--- a/include/forkserver.h
+++ b/include/forkserver.h
@@ -56,6 +56,7 @@ typedef struct afl_forkserver {
   u8 no_unlink;                         /* do not unlink cur_input          */
 
   u32 exec_tmout;                       /* Configurable exec timeout (ms)   */
+  u32 init_tmout;                       /* Configurable init timeout (ms)   */
   u32 map_size;                         /* map size used by the target      */
   u32 snapshot;                         /* is snapshot feature used         */
   u64 mem_limit;                        /* Memory cap for child (MB)        */