Informazioni sui moduli in Linux

In Linux i moduli del kernel sono molto importanti, in quanto sono dei "pezzi di codice" che possono essere abilitati per aggiungere determinate funzioni.

Anche se non lo sapete, ne state già facendo largo uso.

Vediamo come ottenere un pò di informazioni.

Cominciamo con il classico lsmod:

$ lsmod
Module                  Size  Used by
vfat                   24576  1
fat                    86016  1 vfat
nvidia_drm             65536  8
nvidia_modeset       1187840  25 nvidia_drm
nvidia              34971648  1642 nvidia_modeset
rfkill                 28672  3
intel_rapl_msr         20480  0
intel_rapl_common      28672  1 intel_rapl_msr
x86_pkg_temp_thermal    20480  0
intel_powerclamp       20480  0
coretemp               20480  0
kvm_intel             331776  0
kvm                  1015808  1 kvm_intel
snd_soc_rt5640        147456  0
snd_hda_codec_realtek   147456  1
iTCO_wdt               16384  0
irqbypass              16384  1 kvm
snd_hda_codec_generic    98304  1 snd_hda_codec_realtek
mei_hdcp               24576  0
snd_hda_codec_hdmi     73728  2
.................

Questo comandi ci mostra i moduli del kernel attualmente caricati.

Da qui possiamo usare modinfo per avere più informazioni; ad esempio:

$ modinfo ext4
filename:       /lib/modules/5.12.1-arch1-1/kernel/fs/ext4/ext4.ko.xz
softdep:        pre: crc32c
license:        GPL
description:    Fourth Extended Filesystem
author:         Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others
alias:          fs-ext4
alias:          ext3
alias:          fs-ext3
alias:          ext2
alias:          fs-ext2
srcversion:     D9D69D9EAAE3F0676C26B69
depends:        mbcache,jbd2,crc16
retpoline:      Y
intree:         Y
name:           ext4
vermagic:       5.12.1-arch1-1 SMP preempt mod_unload 
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        56:42:55:6B:A7:3F:68:ED:74:4D:ED:9E:3D:00:AE:F2:35:81:60:E8
sig_hashalgo:   sha512
signature:      95:CA:54:3F:ED:15:CA:6F:C1:D5:FC:7D:94:FA:FB:A2:03:BA:DF:93:
                8F:3A:AD:D1:7C:71:D7:00:1A:9F:C6:97:0A:40:2E:6E:F2:89:0C:EB:
                75:36:B6:18:EF:05:4D:2F:38:81:B5:2F:5A:86:85:CB:9C:A4:E4:53:
                37:F7:87:50:56:BB:09:7A:EF:2F:1A:D2:0D:BA:3C:5F:B9:24:00:E1:
                25:52:9E:1A:F2:5D:49:BB:C5:19:64:34:75:6C:C7:D6:FD:A4:1A:81:
                1F:E4:FB:D9:B9:81:5D:A7:C8:AA:F4:41:89:DB:67:F8:A2:0D:60:D5:
                B9:02:71:E1:3D:F2:21:3B:DC:7F:00:99:4D:D7:62:0D:94:76:A6:17:
                23:F3:5D:F3:7E:EC:B0:53:4C:C5:20:68:EE:54:BD:BE:23:4E:61:59:
                D9:CB:FB:0E:64:B3:FF:5B:52:06:2C:B9:60:D8:EB:23:77:98:1A:C4:
                32:04:DD:FF:0A:5D:75:7D:08:7B:E2:F5:93:B9:99:31:3B:9F:E0:F8:
                8D:5F:9C:BB:AB:DF:02:25:55:ED:E0:31:8F:69:5B:B5:23:65:A4:6E:
                1C:A5:E6:A8:CF:5F:C1:9B:4F:24:25:51:C2:71:51:11:73:07:68:D0:
                E3:97:54:E6:46:C2:94:20:D0:13:C4:FE:5D:46:AB:C2:47:0B:27:24:
                67:86:F1:E1:12:BB:FA:5C:05:6D:43:B4:EE:C1:7E:F8:1E:69:0B:95:
                E1:79:02:B3:5B:E7:69:28:4F:C5:BE:0B:FD:4C:5B:04:26:68:77:83:
                FA:E3:AD:E7:3B:CE:5E:3D:A4:3A:E7:24:FC:83:7A:FF:E3:43:D4:A0:
                99:48:AC:2B:F1:92:A8:9A:08:99:42:FC:14:23:CF:AB:14:32:4B:8C:
                C0:FD:34:85:71:A3:F7:8F:D3:BC:1A:62:DD:24:C2:A2:FC:9A:01:32:
                80:B8:03:89:3D:D9:44:A1:16:6C:3A:7B:CE:F9:F8:1B:01:58:B0:F0:
                EE:D9:E9:AA:0F:DC:6A:F6:CB:9D:C1:F1:09:D7:37:0B:8E:B9:17:34:
                5C:F8:B3:07:E0:D0:C3:75:48:5B:75:FC:D3:DF:FF:F9:F9:43:18:CB:
                DC:AC:02:3B:06:CE:BA:B3:A0:EE:76:72:E6:AE:98:50:2D:8B:40:F2:
                6D:34:2C:BF:45:89:A7:DC:61:4F:F3:F3:D6:F5:20:BB:7B:87:DE:DB:
                0E:B5:1E:E3:5D:1D:1A:E4:17:AE:D6:60:44:43:51:C6:45:3D:09:47:
                CA:C4:40:87:A5:4E:17:D2:0D:78:45:B7:46:78:A9:02:0D:0A:4C:FC:
                E0:98:DF:7C:0D:BE:0B:35:44:CC:27:96

Potete usare le varie opzioni che trovate nella man page per visualizzare solo alcuni dati.

Enjoy!