modinfo

What it does

How to write it

modinfo [OPTION]... MODULE|FILE...

Most used

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$ run as a normal user# run as root (or with sudo)

1. 1All information

   $modinfo xfs
   filename:       /lib/modules/6.12.0-55.9.1.el10_0.x86_64/kernel/fs/xfs/xfs.ko.xz
   description:    SGI XFS with ACLs, security attributes, realtime, quota, no debug enabled
   license:        GPL

   Plus depends, signature and more.

2. 2Parameters of a module

   $modinfo -p loop
   max_loop:Maximum number of loop devices (int)
   max_part:Maximum number of partitions per loop device (int)

   Set them with options loop max_part=8.

3. 3Only the file

   $modinfo -n vfat

   Where the .ko file is.

4. 4Dependencies

   $modinfo -F depends vfat
   fat

   modprobe loads these first.

5. 5Hardware IDs a driver supports

   $modinfo -F alias e1000e | head

   Match with lspci -nn IDs.

6. 6Is the module signed? (Secure Boot)

   $modinfo -F signer xfs

   Red Hat signs its modules; unsigned ones do not load with Secure Boot.

7. 7Current value of a parameter

   $cat /sys/module/loop/parameters/max_part

   modinfo shows the options; /sys shows the active value.

8. 8Modules of another kernel

   $modinfo -k 6.12.0-55.el10.x86_64 xfs | head -2

   Check before you boot an older kernel.

9. 9Description only

   $modinfo -d usb-storage

   Short text.

10. 10License (tainted kernel check)

    $modinfo -l nvidia 2>/dev/null

    Non-GPL modules taint the kernel; support may ask.

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