[PATCH 7/7] habanalabs/gaudi2: add secured attestation info uapi

Oded Gabbay
2022-09-18T11:38:02Z

From: Dani Liberman <dliberman@habana.ai>

User will provide a nonce via the ioctl, and will retrieve
secured attestation data of the boot, generated using given
nonce.

Signed-off-by: Dani Liberman <dliberman@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
drivers/misc/habanalabs/common/firmware_if.c | 46 +++++++++++
drivers/misc/habanalabs/common/habanalabs.h | 3 +
.../misc/habanalabs/common/habanalabs_ioctl.c | 52 +++++++++++++
.../misc/habanalabs/include/common/cpucp_if.h | 77 ++++++++++++++++++-
include/uapi/misc/habanalabs.h | 43 +++++++++++
5 files changed, 219 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/firmware_if.c b/drivers/misc/habanalabs/common/firmware_if.c
index c2375917fc02..26a7529083e1 100644
--- a/drivers/misc/habanalabs/common/firmware_if.c
+++ b/drivers/misc/habanalabs/common/firmware_if.c
@@ -2988,3 +2988,49 @@ void hl_fw_set_max_power(struct hl_device *hdev)
if (rc)
dev_err(hdev->dev, "Failed to set max power, error %d\n", rc);
}
+
+static int hl_fw_get_sec_attest_data(struct hl_device *hdev, u32 packet_id, void *data, u32 size,
+ u32 nonce, u32 timeout)
+{
+ struct cpucp_packet pkt = {};
+ dma_addr_t req_dma_addr;
+ void *req_cpu_addr;
+ int rc;
+
+ req_cpu_addr = hl_cpu_accessible_dma_pool_alloc(hdev, size, &req_dma_addr);
+ if (!data) {
+ dev_err(hdev->dev,
+ "Failed to allocate DMA memory for CPU-CP packet %u\n", packet_id);
+ return -ENOMEM;
+ }
+
+ memset(data, 0, size);
+
+ pkt.ctl = cpu_to_le32(packet_id << CPUCP_PKT_CTL_OPCODE_SHIFT);
+ pkt.addr = cpu_to_le64(req_dma_addr);
+ pkt.data_max_size = cpu_to_le32(size);
+ pkt.nonce = cpu_to_le32(nonce);
+
+ rc = hdev->asic_funcs->send_cpu_message(hdev, (u32 *) &pkt, sizeof(pkt),
+ timeout, NULL);
+ if (rc) {
+ dev_err(hdev->dev,
+ "Failed to handle CPU-CP pkt %u, error %d\n", packet_id, rc);
+ goto out;
+ }
+
+ memcpy(data, req_cpu_addr, size);
+
+out:
+ hl_cpu_accessible_dma_pool_free(hdev, size, req_cpu_addr);
+
+ return rc;
+}
+
+int hl_fw_get_sec_attest_info(struct hl_device *hdev, struct cpucp_sec_attest_info *sec_attest_info,
+ u32 nonce)
+{
+ return hl_fw_get_sec_attest_data(hdev, CPUCP_PACKET_SEC_ATTEST_GET, sec_attest_info,
+ sizeof(struct cpucp_sec_attest_info), nonce,
+ HL_CPUCP_SEC_ATTEST_INFO_TINEOUT_USEC);
+}
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 259eebdc2f1b..2ffb8378f565 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -66,6 +66,7 @@ struct hl_fpriv;
#define HL_CPUCP_INFO_TIMEOUT_USEC 10000000 /* 10s */
#define HL_CPUCP_EEPROM_TIMEOUT_USEC 10000000 /* 10s */
#define HL_CPUCP_MON_DUMP_TIMEOUT_USEC 10000000 /* 10s */
+#define HL_CPUCP_SEC_ATTEST_INFO_TINEOUT_USEC 10000000 /* 10s */

#define HL_FW_STATUS_POLL_INTERVAL_USEC 10000 /* 10ms */
#define HL_FW_COMMS_STATUS_PLDM_POLL_INTERVAL_USEC 1000000 /* 1s */
@@ -3750,6 +3751,8 @@ int hl_get_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr, long *va
void hl_set_pwm_info(struct hl_device *hdev, int sensor_index, u32 attr, long value);
long hl_fw_get_max_power(struct hl_device *hdev);
void hl_fw_set_max_power(struct hl_device *hdev);
+int hl_fw_get_sec_attest_info(struct hl_device *hdev, struct cpucp_sec_attest_info *sec_attest_info,
+ u32 nonce);
int hl_set_voltage(struct hl_device *hdev, int sensor_index, u32 attr, long value);
int hl_set_current(struct hl_device *hdev, int sensor_index, u32 attr, long value);
int hl_set_power(struct hl_device *hdev, int sensor_index, u32 attr, long value);
diff --git a/drivers/misc/habanalabs/common/habanalabs_ioctl.c b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
index ab0be082f3a6..43afe40966e5 100644
--- a/drivers/misc/habanalabs/common/habanalabs_ioctl.c
+++ b/drivers/misc/habanalabs/common/habanalabs_ioctl.c
@@ -662,6 +662,55 @@ static int dev_mem_alloc_page_sizes_info(struct hl_fpriv *hpriv, struct hl_info_
return copy_to_user(out, &info, min_t(size_t, max_size, sizeof(info))) ? -EFAULT : 0;
}

+static int sec_attest_info(struct hl_fpriv *hpriv, struct hl_info_args *args)
+{
+ void __user *out = (void __user *) (uintptr_t) args->return_pointer;
+ struct cpucp_sec_attest_info *sec_attest_info;
+ struct hl_info_sec_attest *info;
+ u32 max_size = args->return_size;
+ int rc;
+
+ if ((!max_size) || (!out))
+ return -EINVAL;
+
+ sec_attest_info = kmalloc(sizeof(*sec_attest_info), GFP_KERNEL);
+ if (!sec_attest_info)
+ return -ENOMEM;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ rc = -ENOMEM;
+ goto free_sec_attest_info;
+ }
+
+ rc = hl_fw_get_sec_attest_info(hpriv->hdev, sec_attest_info, args->sec_attest_nonce);
+ if (rc)
+ goto free_info;
+
+ info->nonce = le32_to_cpu(sec_attest_info->nonce);
+ info->pcr_quote_len = le16_to_cpu(sec_attest_info->pcr_quote_len);
+ info->pub_data_len = le16_to_cpu(sec_attest_info->pub_data_len);
+ info->certificate_len = le16_to_cpu(sec_attest_info->certificate_len);
+ info->pcr_num_reg = sec_attest_info->pcr_num_reg;
+ info->pcr_reg_len = sec_attest_info->pcr_reg_len;
+ info->quote_sig_len = sec_attest_info->quote_sig_len;
+ memcpy(&info->pcr_data, &sec_attest_info->pcr_data, sizeof(info->pcr_data));
+ memcpy(&info->pcr_quote, &sec_attest_info->pcr_quote, sizeof(info->pcr_quote));
+ memcpy(&info->public_data, &sec_attest_info->public_data, sizeof(info->public_data));
+ memcpy(&info->certificate, &sec_attest_info->certificate, sizeof(info->certificate));
+ memcpy(&info->quote_sig, &sec_attest_info->quote_sig, sizeof(info->quote_sig));
+
+ rc = copy_to_user(out, info,
+ min_t(size_t, max_size, sizeof(*info))) ? -EFAULT : 0;
+
+free_info:
+ kfree(info);
+free_sec_attest_info:
+ kfree(sec_attest_info);
+
+ return rc;
+}
+
static int eventfd_register(struct hl_fpriv *hpriv, struct hl_info_args *args)
{
int rc;
@@ -844,6 +893,9 @@ static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
case HL_INFO_DRAM_PENDING_ROWS:
return dram_pending_rows_info(hpriv, args);

+ case HL_INFO_SECURED_ATTESTATION:
+ return sec_attest_info(hpriv, args);
+
case HL_INFO_REGISTER_EVENTFD:
return eventfd_register(hpriv, args);

diff --git a/drivers/misc/habanalabs/include/common/cpucp_if.h b/drivers/misc/habanalabs/include/common/cpucp_if.h
index 9593d1a26945..baa5aa43b6f4 100644
--- a/drivers/misc/habanalabs/include/common/cpucp_if.h
+++ b/drivers/misc/habanalabs/include/common/cpucp_if.h
@@ -629,6 +629,12 @@ enum pq_init_status {
* CPUCP_PACKET_ENGINE_CORE_ASID_SET -
* Packet to perform engine core ASID configuration
*
+ * CPUCP_PACKET_SEC_ATTEST_GET -
+ * Get the attestaion data that is collected during various stages of the
+ * boot sequence. the attestation data is also hashed with some unique
+ * number (nonce) provided by the host to prevent replay attacks.
+ * public key and certificate also provided as part of the FW response.
+ *
* CPUCP_PACKET_MONITOR_DUMP_GET -
* Get monitors registers dump from the CpuCP kernel.
* The CPU will put the registers dump in the a buffer allocated by the driver
@@ -691,15 +697,15 @@ enum cpucp_packet_id {
CPUCP_PACKET_RESERVED, /* not used */
CPUCP_PACKET_ENGINE_CORE_ASID_SET, /* internal */
CPUCP_PACKET_RESERVED2, /* not used */
+ CPUCP_PACKET_SEC_ATTEST_GET, /* internal */
CPUCP_PACKET_RESERVED3, /* not used */
CPUCP_PACKET_RESERVED4, /* not used */
- CPUCP_PACKET_RESERVED5, /* not used */
CPUCP_PACKET_MONITOR_DUMP_GET, /* debugfs */
+ CPUCP_PACKET_RESERVED5, /* not used */
CPUCP_PACKET_RESERVED6, /* not used */
CPUCP_PACKET_RESERVED7, /* not used */
CPUCP_PACKET_RESERVED8, /* not used */
CPUCP_PACKET_RESERVED9, /* not used */
- CPUCP_PACKET_RESERVED10, /* not used */
CPUCP_PACKET_ACTIVE_STATUS_SET, /* internal */
CPUCP_PACKET_ID_MAX /* must be last */
};
@@ -794,6 +800,9 @@ struct cpucp_packet {
* result cannot be used to hold general purpose data.
*/
__le32 status_mask;
+
+ /* random, used once number, for security packets */
+ __le32 nonce;
};

/* For NIC requests */
@@ -1219,6 +1228,70 @@ enum cpu_reset_status {
CPU_RST_STATUS_SOFT_RST_DONE = 1,
};

+#define SEC_PCR_DATA_BUF_SZ 256
+#define SEC_PCR_QUOTE_BUF_SZ 510 /* (512 - 2) 2 bytes used for size */
+#define SEC_SIGNATURE_BUF_SZ 255 /* (256 - 1) 1 byte used for size */
+#define SEC_PUB_DATA_BUF_SZ 510 /* (512 - 2) 2 bytes used for size */
+#define SEC_CERTIFICATE_BUF_SZ 2046 /* (2048 - 2) 2 bytes used for size */
+
+/*
+ * struct cpucp_sec_attest_info - attestation report of the boot
+ * @pcr_data: raw values of the PCR registers
+ * @pcr_num_reg: number of PCR registers in the pcr_data array
+ * @pcr_reg_len: length of each PCR register in the pcr_data array (bytes)
+ * @nonce: number only used once. random number provided by host. this also
+ * passed to the quote command as a qualifying data.
+ * @pcr_quote_len: length of the attestation quote data (bytes)
+ * @pcr_quote: attestation report data structure
+ * @quote_sig_len: length of the attestation report signature (bytes)
+ * @quote_sig: signature structure of the attestation report
+ * @pub_data_len: length of the public data (bytes)
+ * @public_data: public key for the signed attestation
+ * (outPublic + name + qualifiedName)
+ * @certificate_len: length of the certificate (bytes)
+ * @certificate: certificate for the attestation signing key
+ */
+struct cpucp_sec_attest_info {
+ __u8 pcr_data[SEC_PCR_DATA_BUF_SZ];
+ __u8 pcr_num_reg;
+ __u8 pcr_reg_len;
+ __le16 pad0;
+ __le32 nonce;
+ __le16 pcr_quote_len;
+ __u8 pcr_quote[SEC_PCR_QUOTE_BUF_SZ];
+ __u8 quote_sig_len;
+ __u8 quote_sig[SEC_SIGNATURE_BUF_SZ];
+ __le16 pub_data_len;
+ __u8 public_data[SEC_PUB_DATA_BUF_SZ];
+ __le16 certificate_len;
+ __u8 certificate[SEC_CERTIFICATE_BUF_SZ];
+};
+
+/*
+ * struct cpucp_dev_info_signed - device information signed by a secured device
+ * @info: device information structure as defined above
+ * @nonce: number only used once. random number provided by host. this number is
+ * hashed and signed along with the device information.
+ * @info_sig_len: length of the attestation signature (bytes)
+ * @info_sig: signature of the info + nonce data.
+ * @pub_data_len: length of the public data (bytes)
+ * @public_data: public key info signed info data
+ * (outPublic + name + qualifiedName)
+ * @certificate_len: length of the certificate (bytes)
+ * @certificate: certificate for the signing key
+ */
+struct cpucp_dev_info_signed {
+ struct cpucp_info info; /* assumed to be 64bit aligned */
+ __le32 nonce;
+ __le32 pad0;
+ __u8 info_sig_len;
+ __u8 info_sig[SEC_SIGNATURE_BUF_SZ];
+ __le16 pub_data_len;
+ __u8 public_data[SEC_PUB_DATA_BUF_SZ];
+ __le16 certificate_len;
+ __u8 certificate[SEC_CERTIFICATE_BUF_SZ];
+};
+
/*
* struct dcore_monitor_regs_data - DCORE monitor regs data.
* the structure follows sync manager block layout. relevant only to Gaudi.
diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h
index a4bab0fd8223..e00ebe05097d 100644
--- a/include/uapi/misc/habanalabs.h
+++ b/include/uapi/misc/habanalabs.h
@@ -773,6 +773,7 @@ enum hl_server_type {
* Razwi initiator.
* Razwi cause, was it a page fault or MMU access error.
* HL_INFO_DEV_MEM_ALLOC_PAGE_SIZES - Retrieve valid page sizes for device memory allocation
+ * HL_INFO_SECURED_ATTESTATION - Retrieve attestation report of the boot.
* HL_INFO_REGISTER_EVENTFD - Register eventfd for event notifications.
* HL_INFO_UNREGISTER_EVENTFD - Unregister eventfd
* HL_INFO_GET_EVENTS - Retrieve the last occurred events
@@ -802,6 +803,7 @@ enum hl_server_type {
#define HL_INFO_CS_TIMEOUT_EVENT 24
#define HL_INFO_RAZWI_EVENT 25
#define HL_INFO_DEV_MEM_ALLOC_PAGE_SIZES 26
+#define HL_INFO_SECURED_ATTESTATION 27
#define HL_INFO_REGISTER_EVENTFD 28
#define HL_INFO_UNREGISTER_EVENTFD 29
#define HL_INFO_GET_EVENTS 30
@@ -1133,6 +1135,45 @@ struct hl_info_dev_memalloc_page_sizes {
__u64 page_order_bitmask;
};

+#define SEC_PCR_DATA_BUF_SZ 256
+#define SEC_PCR_QUOTE_BUF_SZ 510 /* (512 - 2) 2 bytes used for size */
+#define SEC_SIGNATURE_BUF_SZ 255 /* (256 - 1) 1 byte used for size */
+#define SEC_PUB_DATA_BUF_SZ 510 /* (512 - 2) 2 bytes used for size */
+#define SEC_CERTIFICATE_BUF_SZ 2046 /* (2048 - 2) 2 bytes used for size */
+
+/*
+ * struct hl_info_sec_attest - attestation report of the boot
+ * @nonce: number only used once. random number provided by host. this also passed to the quote
+ * command as a qualifying data.
+ * @pcr_quote_len: length of the attestation quote data (bytes)
+ * @pub_data_len: length of the public data (bytes)
+ * @certificate_len: length of the certificate (bytes)
+ * @pcr_num_reg: number of PCR registers in the pcr_data array
+ * @pcr_reg_len: length of each PCR register in the pcr_data array (bytes)
+ * @quote_sig_len: length of the attestation report signature (bytes)
+ * @pcr_data: raw values of the PCR registers
+ * @pcr_quote: attestation report data structure
+ * @quote_sig: signature structure of the attestation report
+ * @public_data: public key for the signed attestation
+ * (outPublic + name + qualifiedName)
+ * @certificate: certificate for the attestation signing key
+ */
+struct hl_info_sec_attest {
+ __u32 nonce;
+ __u16 pcr_quote_len;
+ __u16 pub_data_len;
+ __u16 certificate_len;
+ __u8 pcr_num_reg;
+ __u8 pcr_reg_len;
+ __u8 quote_sig_len;
+ __u8 pcr_data[SEC_PCR_DATA_BUF_SZ];
+ __u8 pcr_quote[SEC_PCR_QUOTE_BUF_SZ];
+ __u8 quote_sig[SEC_SIGNATURE_BUF_SZ];
+ __u8 public_data[SEC_PUB_DATA_BUF_SZ];
+ __u8 certificate[SEC_CERTIFICATE_BUF_SZ];
+ __u8 pad0[2];
+};
+
enum gaudi_dcores {
HL_GAUDI_WS_DCORE,
HL_GAUDI_WN_DCORE,
@@ -1158,6 +1199,7 @@ enum gaudi_dcores {
* driver. It is possible for the user to allocate buffer larger than
* needed, hence updating this variable so user will know the exact amount
* of bytes copied by the kernel to the buffer.
+ * @sec_attest_nonce: Nonce number used for attestation report.
* @pad: Padding to 64 bit.
*/
struct hl_info_args {
@@ -1172,6 +1214,7 @@ struct hl_info_args {
__u32 pll_index;
__u32 eventfd;
__u32 user_buffer_actual_size;
+ __u32 sec_attest_nonce;
};

__u32 pad;
--
2.25.1