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Message-Id: <0e274b29-ac88-4806-a4e1-6f1e38bf42c6@app.fastmail.com>
Date: Tue, 19 Aug 2025 14:45:51 -0400
From: "Mark Pearson" <mpearson-lenovo@...ebb.ca>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: "Hans de Goede" <hansg@...nel.org>, RenHai <kean0048@...il.com>,
"platform-driver-x86@...r.kernel.org" <platform-driver-x86@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: think-lmi: Certificate support for ThinkCenter
Hi Ilpo,
On Tue, Aug 19, 2025, at 6:15 AM, Ilpo Järvinen wrote:
> On Fri, 1 Aug 2025, Mark Pearson wrote:
>
>> ThinkCenter platforms use a different set of GUIDs along with some
>> differences in implementation details for their support of
>> certificate based authentication.
>>
>> Update the think-lmi driver to work correctly on these platforms.
>>
>> Tested on M75q Gen 5
>
> Missing .
Ack
>
>>
>> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
>> Co-developed by: Kean Ren <kean0048@...il.com>
>
> Missing -.
Oops. Will fix
>
> Also, any change which is developed by multiple people should have the
> signed-off-by for all its developers. Effectively, Co-d-b is always to be
> paired S-o-b (obviously the other person should be okay with it, don't
> invent S-o-b just to please the procedure :-) as it has certain legal
> significance).
>
> You should also put your SoB as last.
Ack. Will update
>
>> ---
>> drivers/platform/x86/lenovo/think-lmi.c | 85 +++++++++++++++++++++----
>> drivers/platform/x86/lenovo/think-lmi.h | 1 +
>> 2 files changed, 72 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/platform/x86/lenovo/think-lmi.c b/drivers/platform/x86/lenovo/think-lmi.c
>> index 0992b41b6221..08eac6c18688 100644
>> --- a/drivers/platform/x86/lenovo/think-lmi.c
>> +++ b/drivers/platform/x86/lenovo/think-lmi.c
>> @@ -119,6 +119,7 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * You must reboot the computer before the changes will take effect.
>> */
>> #define LENOVO_SET_BIOS_CERT_GUID "26861C9F-47E9-44C4-BD8B-DFE7FA2610FE"
>> +#define LENOVO_TC_SET_BIOS_CERT_GUID "955aaf7d-8bc4-4f04-90aa-97469512f167"
>>
>> /*
>> * Name: UpdateBiosCert
>> @@ -128,6 +129,7 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * You must reboot the computer before the changes will take effect.
>> */
>> #define LENOVO_UPDATE_BIOS_CERT_GUID "9AA3180A-9750-41F7-B9F7-D5D3B1BAC3CE"
>> +#define LENOVO_TC_UPDATE_BIOS_CERT_GUID "5f5bbbb2-c72f-4fb8-8129-228eef4fdbed"
>>
>> /*
>> * Name: ClearBiosCert
>> @@ -137,6 +139,8 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * You must reboot the computer before the changes will take effect.
>> */
>> #define LENOVO_CLEAR_BIOS_CERT_GUID "B2BC39A7-78DD-4D71-B059-A510DEC44890"
>> +#define LENOVO_TC_CLEAR_BIOS_CERT_GUID "97849cb6-cb44-42d1-a750-26a596a9eec4"
>> +
>> /*
>> * Name: CertToPassword
>> * Description: Switch from certificate to password authentication.
>> @@ -145,6 +149,7 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * You must reboot the computer before the changes will take effect.
>> */
>> #define LENOVO_CERT_TO_PASSWORD_GUID "0DE8590D-5510-4044-9621-77C227F5A70D"
>> +#define LENOVO_TC_CERT_TO_PASSWORD_GUID "ef65480d-38c9-420d-b700-ab3d6c8ebaca"
>>
>> /*
>> * Name: SetBiosSettingCert
>> @@ -153,6 +158,7 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * Format: "Item,Value,Signature"
>> */
>> #define LENOVO_SET_BIOS_SETTING_CERT_GUID "34A008CC-D205-4B62-9E67-31DFA8B90003"
>> +#define LENOVO_TC_SET_BIOS_SETTING_CERT_GUID "19ecba3b-b318-4192-a89b-43d94bc60cea"
>>
>> /*
>> * Name: SaveBiosSettingCert
>> @@ -161,6 +167,7 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> * Format: "Signature"
>> */
>> #define LENOVO_SAVE_BIOS_SETTING_CERT_GUID "C050FB9D-DF5F-4606-B066-9EFC401B2551"
>> +#define LENOVO_TC_SAVE_BIOS_SETTING_CERT_GUID "0afaf46f-7cca-450a-b455-a826a0bf1af5"
>>
>> /*
>> * Name: CertThumbprint
>> @@ -170,6 +177,14 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>> */
>> #define LENOVO_CERT_THUMBPRINT_GUID "C59119ED-1C0D-4806-A8E9-59AA318176C4"
>>
>> +char *cert_thumbprint_guid = LENOVO_CERT_THUMBPRINT_GUID;
>> +char *set_bios_setting_cert_guid = LENOVO_SET_BIOS_SETTING_CERT_GUID;
>> +char *save_bios_setting_cert_guid = LENOVO_SAVE_BIOS_SETTING_CERT_GUID;
>> +char *cert_to_password_guid = LENOVO_CERT_TO_PASSWORD_GUID;
>> +char *clear_bios_cert_guid = LENOVO_CLEAR_BIOS_CERT_GUID;
>> +char *update_bios_cert_guid = LENOVO_UPDATE_BIOS_CERT_GUID;
>> +char *set_bios_cert_guid = LENOVO_SET_BIOS_CERT_GUID;
>> +
>
> These should be static, no?
Good point. Will update.
>
>> #define TLMI_POP_PWD BIT(0) /* Supervisor */
>> #define TLMI_PAP_PWD BIT(1) /* Power-on */
>> #define TLMI_HDD_PWD BIT(2) /* HDD/NVME */
>> @@ -179,9 +194,20 @@ MODULE_PARM_DESC(debug_support, "Enable debug command support");
>>
>> static const struct tlmi_err_codes tlmi_errs[] = {
>> {"Success", 0},
>> + {"Set Certificate operation was successful.", 0},
>> {"Not Supported", -EOPNOTSUPP},
>> {"Invalid Parameter", -EINVAL},
>> {"Access Denied", -EACCES},
>> + {"Set Certificate operation failed with status:Invalid Parameter.", -EINVAL},
>> + {"Set Certificate operation failed with status:Invalid certificate type.", -EINVAL},
>> + {"Set Certificate operation failed with status:Invalid password format.", -EINVAL},
>> + {"Set Certificate operation failed with status:Password retry count exceeded.", -EACCES},
>> + {"Set Certificate operation failed with status:Password Invalid.", -EACCES},
>> + {"Set Certificate operation failed with status:Operation aborted.", -EBUSY},
>> + {"Set Certificate operation failed with status:No free slots to write.", -ENOSPC},
>> + {"Set Certificate operation failed with status:Certificate not found.", -EEXIST},
>> + {"Set Certificate operation failed with status:Internal error.", -EFAULT},
>> + {"Set Certificate operation failed with status:Certificate too large.", -EFBIG},
>> {"System Busy", -EBUSY},
>> };
>>
>> @@ -668,7 +694,10 @@ static ssize_t cert_thumbprint(char *buf, const char *arg, int count)
>> const union acpi_object *obj;
>> acpi_status status;
>>
>> - status = wmi_evaluate_method(LENOVO_CERT_THUMBPRINT_GUID, 0, 0, &input, &output);
>> + if (!cert_thumbprint_guid)
>> + return -EOPNOTSUPP;
>> +
>> + status = wmi_evaluate_method(cert_thumbprint_guid, 0, 0, &input, &output);
>> if (ACPI_FAILURE(status)) {
>> kfree(output.pointer);
>> return -EIO;
>> @@ -751,7 +780,7 @@ static ssize_t cert_to_password_store(struct kobject *kobj,
>> kfree_sensitive(passwd);
>> return -ENOMEM;
>> }
>> - ret = tlmi_simple_call(LENOVO_CERT_TO_PASSWORD_GUID, auth_str);
>> + ret = tlmi_simple_call(cert_to_password_guid, auth_str);
>> kfree(auth_str);
>> kfree_sensitive(passwd);
>>
>> @@ -797,7 +826,7 @@ static ssize_t certificate_store(struct kobject *kobj,
>> if (!auth_str)
>> return -ENOMEM;
>>
>> - ret = tlmi_simple_call(LENOVO_CLEAR_BIOS_CERT_GUID, auth_str);
>> + ret = tlmi_simple_call(clear_bios_cert_guid, auth_str);
>> kfree(auth_str);
>>
>> return ret ?: count;
>> @@ -834,7 +863,7 @@ static ssize_t certificate_store(struct kobject *kobj,
>> kfree(new_cert);
>> return -EACCES;
>> }
>> - guid = LENOVO_UPDATE_BIOS_CERT_GUID;
>> + guid = update_bios_cert_guid;
>> /* Format: 'Certificate,Signature' */
>> auth_str = cert_command(setting, new_cert, signature);
>> } else {
>> @@ -845,9 +874,17 @@ static ssize_t certificate_store(struct kobject *kobj,
>> kfree(new_cert);
>> return -EACCES;
>> }
>> - guid = LENOVO_SET_BIOS_CERT_GUID;
>> - /* Format: 'Certificate, password' */
>> - auth_str = cert_command(setting, new_cert, setting->password);
>> + guid = set_bios_cert_guid;
>> + if (tlmi_priv.thinkcenter_mode) {
>> + /* Format: 'Certificate, password, encoding, kbdlang' */
>> + auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s,%s", new_cert,
>> + setting->password,
>> + encoding_options[setting->encoding],
>> + setting->kbdlang);
>> + } else {
>> + /* Format: 'Certificate, password' */
>> + auth_str = cert_command(setting, new_cert, setting->password);
>> + }
>> }
>> kfree(new_cert);
>> if (!auth_str)
>> @@ -1071,13 +1108,13 @@ static ssize_t current_value_store(struct kobject *kobj,
>> goto out;
>> }
>>
>> - ret = tlmi_simple_call(LENOVO_SET_BIOS_SETTING_CERT_GUID, set_str);
>> + ret = tlmi_simple_call(set_bios_setting_cert_guid, set_str);
>> if (ret)
>> goto out;
>> if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
>> tlmi_priv.save_required = true;
>> else
>> - ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
>> + ret = tlmi_simple_call(save_bios_setting_cert_guid,
>
> Could you please these conversions in a preparatory patch. Then add the
> new stuff in the second patch.
Sure. Will do
>
>> tlmi_priv.pwd_admin->save_signature);
>> } else if (tlmi_priv.opcode_support) {
>> /*
>> @@ -1282,7 +1319,7 @@ static ssize_t save_settings_store(struct kobject *kobj, struct kobj_attribute *
>> ret = -EINVAL;
>> goto out;
>> }
>> - ret = tlmi_simple_call(LENOVO_SAVE_BIOS_SETTING_CERT_GUID,
>> + ret = tlmi_simple_call(save_bios_setting_cert_guid,
>> tlmi_priv.pwd_admin->save_signature);
>> if (ret)
>> goto out;
>> @@ -1583,6 +1620,22 @@ static int tlmi_analyze(struct wmi_device *wdev)
>> wmi_has_guid(LENOVO_SAVE_BIOS_SETTING_CERT_GUID))
>> tlmi_priv.certificate_support = true;
>>
>> + /* ThinkCenter uses different GUIDs for certificate support */
>> + if (wmi_has_guid(LENOVO_TC_SET_BIOS_CERT_GUID) &&
>> + wmi_has_guid(LENOVO_TC_SET_BIOS_SETTING_CERT_GUID) &&
>> + wmi_has_guid(LENOVO_TC_SAVE_BIOS_SETTING_CERT_GUID)) {
>> + tlmi_priv.certificate_support = true;
>> + tlmi_priv.thinkcenter_mode = true;
>> + cert_thumbprint_guid = 0; /* Not supported */
>> + set_bios_setting_cert_guid = LENOVO_TC_SET_BIOS_SETTING_CERT_GUID;
>> + save_bios_setting_cert_guid = LENOVO_TC_SAVE_BIOS_SETTING_CERT_GUID;
>> + cert_to_password_guid = LENOVO_TC_CERT_TO_PASSWORD_GUID;
>> + clear_bios_cert_guid = LENOVO_TC_CLEAR_BIOS_CERT_GUID;
>> + update_bios_cert_guid = LENOVO_TC_UPDATE_BIOS_CERT_GUID;
>> + set_bios_cert_guid = LENOVO_TC_SET_BIOS_CERT_GUID;
>> + pr_info("ThinkCenter modified support being used\n");
>
> This looks like you'd want to have a single (const?) struct which holds
> all this information so you'd not need to assign a gazillion of pointers.
hadn't thought of doing it that way, six pointers didn't seem too bad :)
I'll have a look at that approach.
Thanks for the review
Mark
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