Question

A kernel module I created is constantly generating information that I would like to store within the kernel and be readable from root. I was thinking of storing the information in some sort of log file with specific permissions, but I read that writing to files within the kernel space code is not good.

What is a good way to store information in the kernel that is fast and accessible by root?

~Thanks

Answer 1

If it’s constantly generating new information, I would write it out with printk(). This way it will be seen by dmesg as well be written out to /var/log/kern.log.

Although, this is not for sensitive information, since dmesg could be used by any user.

Depending on the type of information, you can also provide it via /proc or /sys files, netlink, relayfs, /dev ioctl.