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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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11
src/afl-fuzz-state.c
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@ -418,6 +418,13 @@ void read_afl_environment(afl_state_t *afl, char **envp) {
(u8 *)get_afl_env(afl_environment_variables[i]);
#endif
} else if (!strncmp(env, "AFL_KILL_SIGNAL",
afl_environment_variable_len)) {
afl->afl_env.afl_kill_signal =
(u8 *)get_afl_env(afl_environment_variables[i]);
}
} else {
@ -524,8 +531,8 @@ void afl_states_stop(void) {
LIST_FOREACH(&afl_states, afl_state_t, {
if (el->fsrv.child_pid > 0) kill(el->fsrv.child_pid, SIGKILL);
if (el->fsrv.fsrv_pid > 0) kill(el->fsrv.fsrv_pid, SIGKILL);
if (el->fsrv.child_pid > 0) kill(el->fsrv.child_pid, el->fsrv.kill_signal);
if (el->fsrv.fsrv_pid > 0) kill(el->fsrv.fsrv_pid, el->fsrv.kill_signal);
});