lkdtm: Make lkdtm_do_action() return to avoid tail call optimization

The comments for lkdtm_do_action() explicitly call out that it
shouldn't be inlined because we want it to show up in stack
crawls. However, at least with some compilers / options it's still
vanishing due to tail call optimization. Let's add a return value to
the function to make it harder for the compiler to do tail call
optimization here.

Now that we have a return value, we can actually use it in the
callers, which is a minor improvement in the code.

Signed-off-by: Douglas Anderson <[e-mail]>
Link: https://lore.kernel.org/r/20240122164935.1.I345e485f36babad76370c59659a706723750d950@changeid
Signed-off-by: Kees Cook <[e-mail]>

drivers/misc/lkdtm/core.c

···
 /*
  * This is forced noinline just so it distinctly shows up in the stackdump
  * which makes validation of expected lkdtm crashes easier.
+ *
+ * NOTE: having a valid return value helps prevent the compiler from doing
+ * tail call optimizations and taking this out of the stack trace.
  */
-static noinline void lkdtm_do_action(const struct crashtype *crashtype)
+static noinline int lkdtm_do_action(const struct crashtype *crashtype)
 {
 	if (WARN_ON(!crashtype || !crashtype->func))
-		return;
+		return -EINVAL;
 	crashtype->func();
+
+	return 0;
 }
 
 static int lkdtm_register_cpoint(struct crashpoint *crashpoint,
···
 	int ret;
 
 	/* If this doesn't have a symbol, just call immediately. */
-	if (!crashpoint->kprobe.symbol_name) {
-		lkdtm_do_action(crashtype);
-		return 0;
-	}
+	if (!crashpoint->kprobe.symbol_name)
+		return lkdtm_do_action(crashtype);
 
 	if (lkdtm_kprobe != NULL)
 		unregister_kprobe(lkdtm_kprobe);
···
 	spin_unlock_irqrestore(&crash_count_lock, flags);
 
 	if (do_it)
-		lkdtm_do_action(lkdtm_crashtype);
+		return lkdtm_do_action(lkdtm_crashtype);
 
 	return 0;
 }
···
 {
 	const struct crashtype *crashtype;
 	char *buf;
+	int err;
 
 	if (count >= PAGE_SIZE)
 		return -EINVAL;
···
 		return -EINVAL;
 
 	pr_info("Performing direct entry %s\n", crashtype->name);
-	lkdtm_do_action(crashtype);
+	err = lkdtm_do_action(crashtype);
 	*off += count;
 
+	if (err)
+		return err;
 	return count;
 }