linux-kernel - RE: Unloaded tainted modules list with tcrypt

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Date:   Tue, 11 Oct 2022 00:09:38 +0000
From:   "Elliott, Robert (Servers)" <elliott@....com>
To:     "Elliott, Robert (Servers)" <elliott@....com>,
        Aaron Tomlin <atomlin@...hat.com>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Unloaded tainted modules list with tcrypt



> -----Original Message-----
> From: Elliott, Robert (Servers) <elliott@....com>
> Sent: Monday, October 10, 2022 10:12 AM
> To: Aaron Tomlin <atomlin@...hat.com>; linux-modules@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Unloaded tainted modules list with tcrypt
> 
> When repeatedly using the tcrypt module (which is designed to never
> load successfully), the "Unloaded tainted modules" list grows forever:
> 
> Unloaded tainted modules: tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1 tcrypt():1
> tcrypt():1 tcrypt():1 padlock_aes():1 padlock_aes():1
> isst_if_mbox_msr():1 acpi_cpufreq():1 pcc_cpufreq():1 isst_if_mbox_msr():1
> acpi_cpufreq():1 pcc_cpufreq():1 acpi_cpufreq():1 acpi_cpufreq():1
> pcc_cpufreq():1 isst_if_mbox_msr():1 acpi_cpufreq():1 acpi_cpufreq():1
> pcc_cpufreq():1 isst_if_mbox_msr():1 acpi_cpufreq():1 acpi_cpufreq():1
> isst_if_mbox_msr():1 isst_if_mbox_msr():1
> acpi_cpufreq():1 pcc_cpufreq():1 acpi_cpufreq():1 isst_if_mbox_msr():1
> 
> Some other modules like acpi_cpufreq() are repeated too.
> 
> Maybe this check after the name comparison:
> 	mod_taint->taints & mod->taints
> should be:
> 	mod_taint->taints == mod->taints
> 
> or shouldn't be there at all?

Changing to == seems to work well - that shows incremented counts
rather than new entries:
Unloaded tainted modules: tcrypt():40 padlock_aes():1 isst_if_mbox_msr():56 pcc_cpufreq():56 acpi_cpufreq():112