kernel: optimize dynamic signature operation, enhance error recovery capability

- Add timeout protection for multi-manager APK verification.

kernel/dynamic_sign.h

@@ -2,6 +2,7 @@
 #define __KSU_H_DYNAMIC_SIGN
 
 #include <linux/types.h>
+#include <linux/completion.h>
 #include "ksu.h"
 
 #define DYNAMIC_SIGN_FILE_MAGIC 0x7f445347 // 'DSG', u32
@@ -20,7 +21,7 @@ struct manager_info {
     bool is_active;
 };
 
-// Dynamic sign operations
+// Enhanced dynamic sign operations with error recovery
 int ksu_handle_dynamic_sign(struct dynamic_sign_user_config *config);
 void ksu_dynamic_sign_init(void);
 void ksu_dynamic_sign_exit(void);
@@ -34,10 +35,13 @@ bool ksu_is_any_manager(uid_t uid);
 int ksu_get_manager_signature_index(uid_t uid);
 int ksu_get_active_managers(struct manager_list_info *info);
 
-// Multi-manager APK verification
+// Multi-manager APK verification with timeout protection
 bool ksu_is_multi_manager_apk(char *path, int *signature_index);
 
 // Manager rescanning functionality
 bool ksu_trigger_manager_rescan(void);
 
+// Configuration access for signature verification
+bool ksu_get_dynamic_sign_config(unsigned int *size, const char **hash);
+
 #endif