Kernel module to read memory. sudo insmod memdump.ko addr=0xffffffff81dd7000 size=2048 && sudo rmmod memdump.ko && sudo dmesg -c

Makefile

obj-m += memdump.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

memdump.c

#include <linux/module.h>	/* Needed by all modules */
#include <linux/kernel.h>	/* Needed for KERN_INFO */
#include <linux/init.h>		/* Needed for the macros */

static unsigned long int addr = 0xffffffff81dd7000l;
module_param(addr, ulong, S_IRUSR);
MODULE_PARM_DESC(addr, "Start address");

static long int size = 2048;
module_param(size, long, S_IRUSR);
MODULE_PARM_DESC(size, "Data size in bytes");

static int __init hello_2_init(void)
{
	char buff[50];
	uint64_t i;
	printk(KERN_INFO "Start address: %016p\n", addr);
	for(i = 0; i < 2048; i++){
		uint32_t tmp = 0;
		char *c;
		c = (char*)(addr + i);
		tmp = *c;
		tmp = tmp % 256;
		sprintf(&buff[(i%16)*3], "%2x ", tmp);

		if(i%16==15){
			printk("%s\n", buff);
		}
	}
	return 0;
}

static void __exit hello_2_exit(void)
{
}

module_init(hello_2_init);
module_exit(hello_2_exit);