libbpf-tools: Allow filelife to run on kernels without CONIFG_SECURITY

security_inode_create does NOT exist if CONIFG_SECURITY is not set.
The tool filelife attaches to security_inode_create unconditionally
and result in attach error. Fix it by checking symbol existence.

Signed-off-by: Hengqi Chen <[email protected]>

libbpf-tools/filelife.c

@@ -138,6 +138,9 @@ int main(int argc, char **argv)
  /* initialize global data (filtering options) */
  obj->rodata->targ_tgid = env.pid;
 
+ if (!kprobe_exists("security_inode_create"))
+ bpf_program__set_autoload(obj->progs.security_inode_create, false);
+
  err = filelife_bpf__load(obj);
  if (err) {
  fprintf(stderr, "failed to load BPF object: %d\n", err);