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Add AFL_FORK_SERVER_KILL_SIGNAL environment variable.

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The AFL_FORK_SERVER_KILL_SIGNAL variable allows to configure the signal
used to kill the fork server on termination.
This commit is contained in:
Nils Bars
2022-10-21 12:13:43 +02:00
parent f84ea69660
commit 7512316b46
13 changed files with 58 additions and 45 deletions
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12
src/afl-fuzz-state.c
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@ -485,10 +485,15 @@ void read_afl_environment(afl_state_t *afl, char **envp) {
#endif
} else if (!strncmp(env, "AFL_KILL_SIGNAL",
afl_environment_variable_len)) {
afl->afl_env.afl_kill_signal =
afl->afl_env.afl_child_kill_signal =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_FORK_SERVER_KILL_SIGNAL",
afl_environment_variable_len)) {
afl->afl_env.afl_fsrv_kill_signal =
(u8 *)get_afl_env(afl_environment_variables[i]);
} else if (!strncmp(env, "AFL_TARGET_ENV",
@ -657,8 +662,7 @@ void afl_states_stop(void) {
/* NOTE: We need to make sure that the parent (the forkserver) reap the child (see below). */
if (el->fsrv.child_pid > 0) kill(el->fsrv.child_pid, el->fsrv.child_kill_signal);
if (el->fsrv.fsrv_pid > 0) {
/* This must be SIGTERM, to allow the forkserver to reap the child before exiting. */
kill(el->fsrv.fsrv_pid, SIGTERM);
kill(el->fsrv.fsrv_pid, el->fsrv.fsrv_kill_signal);
/* Make sure the forkserver does not end up as zombie. */
waitpid(el->fsrv.fsrv_pid, NULL, 0);
}