Fix kconfig string loading

aya/src/bpf.rs

@@ -171,12 +171,11 @@ fn compute_kconfig_definition(features: &Features) -> HashMap<String, Vec<u8>> {
                 Some('y') => 1_u64.to_ne_bytes().to_vec(),
                 Some('m') => 2_u64.to_ne_bytes().to_vec(),
                 Some('"') => {
-                    if raw_value.len() > 2 || raw_value.ends_with('"') {
+                    if raw_value.len() < 2 || !raw_value.ends_with('"') {
                         continue;
                     }
 
                     let raw_value = &raw_value[1..raw_value.len() - 1];
-
                     raw_value.as_bytes().to_vec()
                 }
                 Some(_) => {

test/integration-test/bpf/kconfig.bpf.c

@@ -9,6 +9,8 @@ extern unsigned int CONFIG_BPF __kconfig;
 extern unsigned int CONFIG_PANIC_TIMEOUT __kconfig;
 // CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
 extern unsigned int CONFIG_DEFAULT_HUNG_TASK_TIMEOUT __kconfig;
+// CONFIG_DEFAULT_HOSTNAME
+extern char CONFIG_DEFAULT_HOSTNAME[] __kconfig;
 
 SEC("xdp")
 int kconfig(struct xdp_md *ctx) {
@@ -24,6 +26,12 @@ int kconfig(struct xdp_md *ctx) {
     return XDP_DROP;
   }
 
+  for (int i = 0; i < 7; i++) {
+    if ("(none)"[i] != CONFIG_DEFAULT_HOSTNAME[i]) {
+      return XDP_DROP;
+    }
+  }
+
   return XDP_PASS;
 }