LKM Issue for modpost: "kallsyms_lookup_name" for higher version of L…

…INUX KERNEL resolved

LKM/new_lkm.c

@@ -10,13 +10,24 @@
 #include <linux/semaphore.h>
 #include <linux/syscalls.h>
 #include <linux/kallsyms.h>
+#include <linux/version.h>
 
 #define FDPUT_FPUT       1
 #define FDPUT_POS_UNLOCK 2
 #define FMODE_ATOMIC_POS    ((__force fmode_t)0x8000)
 
-MODULE_DESCRIPTION("My kernel module");
-MODULE_AUTHOR("Me");
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)
+#define KPROBE_LOOKUP 1
+#include <linux/kprobes.h>
+static struct kprobe kp = {
+    .symbol_name = "kallsyms_lookup_name"
+};
+#endif
+
+
+
+MODULE_DESCRIPTION("Kernel Module to Augument the application logs");
+MODULE_AUTHOR("CSE Dept. IIT KGP");
 MODULE_LICENSE("GPL");
 
 // static void **sys_call_table;
@@ -199,9 +210,18 @@ int set_addr_ro(void *ptr){
   return 0;
 }
 
+
 static int init_function(void) 
 {
-
+
+#ifdef KPROBE_LOOKUP
+    typedef unsigned long (*kallsyms_lookup_name_t)(const char *name);
+    kallsyms_lookup_name_t kallsyms_lookup_name;
+    register_kprobe(&kp);
+    kallsyms_lookup_name = (kallsyms_lookup_name_t) kp.addr;
+    unregister_kprobe(&kp);
+#endif
+
 	sys_call_table_addr = kallsyms_lookup_name("sys_call_table");
 
 	set_addr_rw((void*)sys_call_table_addr);