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crypto: ccp - Export PSP security bits to userspace

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The PSP sets several pre-defined bits in the capabilities
register to indicate that security attributes of the platform.

Export these attributes into userspace for administrators to
confirm platform is properly locked down.

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2022-03-31 16:12:11 -05:00 committed by Herbert Xu
parent cac32cd4f1
commit 50c4decc1b
3 changed files with 166 additions and 0 deletions
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87
Documentation/ABI/testing/sysfs-driver-ccp Normal file
View File

@ -0,0 +1,87 @@
What: /sys/bus/pci/devices/<BDF>/fused_part
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/fused_part file reports
whether the CPU or APU has been fused to prevent tampering.
0: Not fused
1: Fused
What: /sys/bus/pci/devices/<BDF>/debug_lock_on
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/debug_lock_on reports
whether the AMD CPU or APU has been unlocked for debugging.
Possible values:
0: Not locked
1: Locked
What: /sys/bus/pci/devices/<BDF>/tsme_status
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/tsme_status file reports
the status of transparent secure memory encryption on AMD systems.
Possible values:
0: Not active
1: Active
What: /sys/bus/pci/devices/<BDF>/anti_rollback_status
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/anti_rollback_status file reports
whether the PSP is enforcing rollback protection.
Possible values:
0: Not enforcing
1: Enforcing
What: /sys/bus/pci/devices/<BDF>/rpmc_production_enabled
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/rpmc_production_enabled file reports
whether Replay Protected Monotonic Counter support has been enabled.
Possible values:
0: Not enabled
1: Enabled
What: /sys/bus/pci/devices/<BDF>/rpmc_spirom_available
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/rpmc_spirom_available file reports
whether an Replay Protected Monotonic Counter supported SPI is installed
on the system.
Possible values:
0: Not present
1: Present
What: /sys/bus/pci/devices/<BDF>/hsp_tpm_available
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/hsp_tpm_available file reports
whether the HSP TPM has been activated.
Possible values:
0: Not activated or present
1: Activated
What: /sys/bus/pci/devices/<BDF>/rom_armor_enforced
Date: June 2022
KernelVersion: 5.19
Contact: mario.limonciello@amd.com
Description:
The /sys/bus/pci/devices/<BDF>/rom_armor_enforced file reports
whether RomArmor SPI protection is enforced.
Possible values:
0: Not enforced
1: Enforced

17
drivers/crypto/ccp/psp-dev.h
View File

@ -61,5 +61,22 @@ struct psp_device *psp_get_master_device(void);
#define PSP_CAPABILITY_SEV BIT(0)
#define PSP_CAPABILITY_TEE BIT(1)
#define PSP_CAPABILITY_PSP_SECURITY_REPORTING BIT(7)
#define PSP_CAPABILITY_PSP_SECURITY_OFFSET 8
/*
* The PSP doesn't directly store these bits in the capability register
* but instead copies them from the results of query command.
*
* The offsets from the query command are below, and shifted when used.
*/
#define PSP_SECURITY_FUSED_PART BIT(0)
#define PSP_SECURITY_DEBUG_LOCK_ON BIT(2)
#define PSP_SECURITY_TSME_STATUS BIT(5)
#define PSP_SECURITY_ANTI_ROLLBACK_STATUS BIT(7)
#define PSP_SECURITY_RPMC_PRODUCTION_ENABLED BIT(8)
#define PSP_SECURITY_RPMC_SPIROM_AVAILABLE BIT(9)
#define PSP_SECURITY_HSP_TPM_AVAILABLE BIT(10)
#define PSP_SECURITY_ROM_ARMOR_ENFORCED BIT(11)
#endif /* __PSP_DEV_H */

62
drivers/crypto/ccp/sp-pci.c
View File

@ -32,6 +32,67 @@ struct sp_pci {
};
static struct sp_device *sp_dev_master;
#define attribute_show(name, def) \
static ssize_t name##_show(struct device *d, struct device_attribute *attr, \
char *buf) \
{ \
struct sp_device *sp = dev_get_drvdata(d); \
struct psp_device *psp = sp->psp_data; \
int bit = PSP_SECURITY_##def << PSP_CAPABILITY_PSP_SECURITY_OFFSET; \
return sysfs_emit(buf, "%d\n", (psp->capability & bit) > 0); \
}
attribute_show(fused_part, FUSED_PART)
static DEVICE_ATTR_RO(fused_part);
attribute_show(debug_lock_on, DEBUG_LOCK_ON)
static DEVICE_ATTR_RO(debug_lock_on);
attribute_show(tsme_status, TSME_STATUS)
static DEVICE_ATTR_RO(tsme_status);
attribute_show(anti_rollback_status, ANTI_ROLLBACK_STATUS)
static DEVICE_ATTR_RO(anti_rollback_status);
attribute_show(rpmc_production_enabled, RPMC_PRODUCTION_ENABLED)
static DEVICE_ATTR_RO(rpmc_production_enabled);
attribute_show(rpmc_spirom_available, RPMC_SPIROM_AVAILABLE)
static DEVICE_ATTR_RO(rpmc_spirom_available);
attribute_show(hsp_tpm_available, HSP_TPM_AVAILABLE)
static DEVICE_ATTR_RO(hsp_tpm_available);
attribute_show(rom_armor_enforced, ROM_ARMOR_ENFORCED)
static DEVICE_ATTR_RO(rom_armor_enforced);
static struct attribute *psp_attrs[] = {
&dev_attr_fused_part.attr,
&dev_attr_debug_lock_on.attr,
&dev_attr_tsme_status.attr,
&dev_attr_anti_rollback_status.attr,
&dev_attr_rpmc_production_enabled.attr,
&dev_attr_rpmc_spirom_available.attr,
&dev_attr_hsp_tpm_available.attr,
&dev_attr_rom_armor_enforced.attr,
NULL
};
static umode_t psp_security_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
{
struct device *dev = kobj_to_dev(kobj);
struct sp_device *sp = dev_get_drvdata(dev);
struct psp_device *psp = sp->psp_data;
if (psp && (psp->capability & PSP_CAPABILITY_PSP_SECURITY_REPORTING))
return 0444;
return 0;
}
static struct attribute_group psp_attr_group = {
.attrs = psp_attrs,
.is_visible = psp_security_is_visible,
};
static const struct attribute_group *psp_groups[] = {
&psp_attr_group,
NULL,
};
static int sp_get_msix_irqs(struct sp_device *sp)
{
struct sp_pci *sp_pci = sp->dev_specific;
@ -391,6 +452,7 @@ static struct pci_driver sp_pci_driver = {
.remove = sp_pci_remove,
.shutdown = sp_pci_shutdown,
.driver.pm = &sp_pci_pm_ops,
.dev_groups = psp_groups,
};
int sp_pci_init(void)