Fix potential integer overflow for last frame on IRQ/WQ context

Author: Adam-pi3

src/modules/exploit_detection/p_exploit_detection.c

@@ -1515,7 +1515,7 @@ static inline int p_is_obj_on_stack(struct task_struct *p_task, const void *p_ad
 
    void *p_stack = p_task->stack; //task_stack_page(p_task);
 
-   return (p_addr >= p_stack) && (p_addr + p_size < (p_stack + THREAD_SIZE));
+   return (p_addr >= p_stack) && ((unsigned long)p_addr < P_KERNEL_LAST_UNUSED_HOLE) && (p_addr + p_size < (p_stack + THREAD_SIZE));
 }
 
 int p_ed_enforce_pcfi(struct task_struct *p_task, struct p_ed_process *p_orig, struct pt_regs *p_regs) {

src/modules/exploit_detection/p_exploit_detection.h

@@ -18,6 +18,8 @@
 #ifndef P_EXPLOIT_DETECTION_MAIN_H
 #define P_EXPLOIT_DETECTION_MAIN_H
 
+#define P_KERNEL_LAST_UNUSED_HOLE 0xffffffffffe00000
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,17,0) && defined(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
 
   /*