CODEWITHSUNDEEP
modulelinux-kernel
user690936
user690936

Reputation: 1035

Writing permessions for linux kernel module paramater

I have a module i created in linux kernel. I want the module to receive parameters, and i want one of them to have reading and writing permissions. So i defined :

module_param(param, int, S_IWUSR|S_IRUGO);

But for some reason when i go to /sys/module/mymodule/paramter/param and try to write to it does not give me permission (even using sudo)

Upvotes: 2

Views: 2074

Answers (1)

ldx
ldx

Reputation: 4084

Do you use sudo with echo like

sudo echo 1 > /sys/module/mymodule/paramter/param

this?

Redirection to a file does not work with sudo. Use e.g. tee instead:

echo 1|sudo tee /sys/module/mymodule/paramter/param

That way you can write to a file as root.

Apart from that, your module_param() call looks good.

Upvotes: 2

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