do_sys_open kprobe is always returning the same filename

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I wrote a module which registers kprobe on do_sys_open and i am trying to print the filename in the pre_handler

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kprobes.h>

MODULE_LICENSE("GPL");

static struct kprobe kp;
static char *name = "do_sys_open";
module_param(name, charp, 0);

static int pre_handler(struct kprobe *p, struct pt_regs *regs)
{
    char *filename = (char *)regs->si;
        char user_filename[256] = {0};
        long copied = strncpy_from_user(user_filename, filename, sizeof(user_filename));
    
    pr_info("eax: %08lx   ebx: %08lx   ecx: %08lx   edx: %08lx\n",
            regs->ax, regs->bx, regs->cx, regs->dx);
    pr_info("esi: %08lx   edi: %08lx   ebp: %08lx   esp: %08lx\n",
            regs->si, regs->di, regs->bp, regs->sp);

    if (copied > 0)
                pr_info("%s filename:%s\n",__func__, user_filename);
    return 0;
}

static int __init hello_init(void)
{
    /* set the handler functions */

    kp.pre_handler = pre_handler;
    kp.symbol_name = name;

    return register_kprobe(&kp);
}

static void __exit hello_exit(void)
{
    pr_info("%s\n", __func__);
    unregister_kprobe(&kp);
}

module_init(hello_init);
module_exit(hello_exit);

After loading this module, i am continuously getting the same file name: pre_handler filename:/run/log/journal/e5f9bd15e9f247dd888fba443a4d9599/system.journal

What's wrong with the above code?



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