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User defined kill signal value (#678)

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* Adding AFL_KILL_SIGNAL environment variable

Controlling the kill signal used to end forked processes.

* Checking validity of AFL_KILL_SIGNAL env variable

This commit also sets a valid value in the environment to avoid
duplicating code in at_exit(). Changing data type of
fsrv->kill_signal to u8 to match last_kill_signal.

* Adding afl_kill_signal to AFL (environment) state

This commit simply introduces a struct member for future use. The
env variable is not used from the afl struct but from fsrv, where
its validity is checked, resulting in a FATAL in case of errors.
This commit is contained in:
buherator
2021-01-07 22:35:34 +01:00
committed by GitHub
parent 52c221fc48
commit 9cdf5c4150
6 changed files with 63 additions and 10 deletions
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13
src/afl-fuzz.c
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@ -76,8 +76,17 @@ static void at_exit() {
}
if (pid1 > 0) { kill(pid1, SIGKILL); }
if (pid2 > 0) { kill(pid2, SIGKILL); }
u8 kill_signal = SIGKILL;
/* AFL_KILL_SIGNAL should already be initialized by afl_fsrv_init() */
if (getenv("AFL_KILL_SIGNAL")) {
kill_signal = atoi(getenv("AFL_KILL_SIGNAL"));
}
if (pid1 > 0) { kill(pid1, kill_signal); }
if (pid2 > 0) { kill(pid2, kill_signal); }
}