Public bug reported:
In linux-modules-5.3.0-19-generic and earlier, on bionic, modules were
signed (note "signat: PKCS#7"):
$ modinfo /lib/modules/5.3.0-19-generic/kernel/arch/x86/kernel/cpuid.ko
filename: /lib/modules/5.3.0-19-generic/kernel/arch/x86/kernel/cpuid.ko
license: GPL
description: x86 generic CPUID driver
author: H. Peter Anvin <h...@zytor.com>
srcversion: 94362896973583C3E6E82D1
depends:
retpoline: Y
intree: Y
name: cpuid
vermagic: 5.3.0-19-generic SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
Recently they haven't been (note complete absence of signature fields):
$ modinfo /lib/modules/5.3.0-22-generic/kernel/arch/x86/kernel/cpuid.ko
filename: /lib/modules/5.3.0-22-generic/kernel/arch/x86/kernel/cpuid.ko
license: GPL
description: x86 generic CPUID driver
author: H. Peter Anvin <h...@zytor.com>
srcversion: 94362896973583C3E6E82D1
depends:
retpoline: Y
intree: Y
name: cpuid
vermagic: 5.3.0-22-generic SMP mod_unload
$ modinfo /lib/modules/5.3.0-23-generic/kernel/arch/x86/kernel/cpuid.ko
filename: /lib/modules/5.3.0-23-generic/kernel/arch/x86/kernel/cpuid.ko
license: GPL
description: x86 generic CPUID driver
author: H. Peter Anvin <h...@zytor.com>
srcversion: 94362896973583C3E6E82D1
depends:
retpoline: Y
intree: Y
name: cpuid
vermagic: 5.3.0-23-generic SMP mod_unload
As a result I can't load any modules if I boot via UEFI secure boot!
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: eoan
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https://bugs.launchpad.net/bugs/1852799
Title:
Regression: modules in bionic -hwe-18.04-edge kernels aren't signed
since 5.3.0-22
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