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We check before if the AFL_PRELOAD env variable is set

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Alexandre DOYEN
2025-05-05 09:49:56 +02:00
parent 6f4767ea81
commit e9f49527e9
2 changed files with 10 additions and 2 deletions
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4
instrumentation/afl-compiler-rt.o.c
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@ -1046,8 +1046,12 @@ static void __afl_start_forkserver(void) {
/* In child process: close fds, resume execution. */ /* In child process: close fds, resume execution. */
if (unlikely(!child_pid)) { // just to signal afl-fuzz faster if (unlikely(!child_pid)) { // just to signal afl-fuzz faster
if (unlikely(getenv("AFL_PRELOAD") != NULL)) {
unsetenv("AFL_FORKSERVER_PARENT"); unsetenv("AFL_FORKSERVER_PARENT");
}
//(void)nice(-20); //(void)nice(-20);
signal(SIGCHLD, old_sigchld_handler); signal(SIGCHLD, old_sigchld_handler);

4
src/afl-forkserver.c
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@ -878,8 +878,12 @@ void afl_fsrv_start(afl_forkserver_t *fsrv, char **argv,
/* CHILD PROCESS */ /* CHILD PROCESS */
if (unlikely(getenv("AFL_PRELOAD") != NULL)) {
setenv("AFL_FORKSERVER_PARENT", "1", 0); setenv("AFL_FORKSERVER_PARENT", "1", 0);
}
// enable terminating on sigpipe in the children // enable terminating on sigpipe in the children
struct sigaction sa; struct sigaction sa;
memset((char *)&sa, 0, sizeof(sa)); memset((char *)&sa, 0, sizeof(sa));