Hi, To print kernel virtual address, you should use %px instead of %p in the printk. Probably that’s why you couldn’t see the pointer values correctly. Chan From: admin LI <admin@hifiphile.com> Sent: Friday, January 14, 2022 6:02 AM To: kernelnewbies@kernelnewbies.org Subject: How to disable address randomization ? Hi, I'm developing a kernel module for an ARM machine, while debugging I found addresses printed are all randomized and useless for debugging. To prove I was not crazy I wrote this small program: --------------------------------- #include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/slab.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("Somebody"); MODULE_DESCRIPTION("A simple example Linux module."); MODULE_VERSION("0.01"); static int __init example_init(void) { uint32_t a; uint32_t b; uint32_t c; uint8_t d[10]; uint8_t *e; printk(KERN_INFO "Hello, World!\n"); printk(KERN_INFO "&a %p\n",&a); printk(KERN_INFO "&b %p\n",&b); printk(KERN_INFO "&c %p\n",&c); printk(KERN_INFO "&d %p\n",d); printk(KERN_INFO "&d[0] %p\n",&d[0]); printk(KERN_INFO "&d[1] %p\n",&d[1]); e = kmalloc(10, GFP_KERNEL); printk(KERN_INFO "&e[0] %p\n",&e[0]); printk(KERN_INFO "&e[1] %p\n",&e[1]); kfree(e); return 0; } static void __exit example_exit(void) { printk(KERN_INFO "Goodbye, World!\n"); } module_init(example_init); module_exit(example_exit); --------------------------------- And it gave me this output: Hello, World! &a b3f9fa31 &b 27e1c68a &c da50d287 &d 9f9aec2b &d[0] 9f9aec2b &d[1] cc627580 &e[0] 98b8c9eb &e[1] 45f248f8 Then I tested on my debian host machine which gave me the same kind of randomized addresses. When I search randomization the only thing I found is KASLR which I don't think is the same thing.