Re: [PATCH v3 4/6] tee: Export uuidv5 generation for TEE backends

[Sumit Garg <sumit.garg@kernel.org>]

On Thu, 01 Oct 2026 at 16:32:36 +0530, Harshal Dev wrote:
>Export the uuidv5() function defined in the TEE core to all TEE backends.
>This enables the TEE backend drivers to generate a UUID for identifying
>and registering their secure services on the TEE bus.
>
>Signed-off-by: Harshal Dev <harshal.dev@oss.qualcomm.com>
>---
> drivers/tee/tee_core.c   |  9 +++++----
> include/linux/tee_core.h | 15 +++++++++++++++
> 2 files changed, 20 insertions(+), 4 deletions(-)
>

Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>

-Sumit

>diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
>index a03a3d645dd1..2cfd302d1393 100644
>--- a/drivers/tee/tee_core.c
>+++ b/drivers/tee/tee_core.c
>@@ -135,7 +135,7 @@ static int tee_release(struct inode *inode, struct file *filp)
> }
>
> /**
>- * uuid_v5() - Calculate UUIDv5
>+ * tee_generate_uuid_v5() - Calculate UUIDv5
>  * @uuid: Resulting UUID
>  * @ns: Name space ID for UUIDv5 function
>  * @name: Name for UUIDv5 function
>@@ -146,8 +146,8 @@ static int tee_release(struct inode *inode, struct file *filp)
>  * This implements section (for SHA-1):
>  * 4.3.  Algorithm for Creating a Name-Based UUID
>  */
>-static void uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
>-		    size_t size)
>+void tee_generate_uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
>+			  size_t size)
> {
> 	unsigned char hash[SHA1_DIGEST_SIZE];
> 	struct sha1_ctx ctx;
>@@ -163,6 +163,7 @@ static void uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
> 	uuid->b[6] = (hash[6] & 0x0F) | 0x50;
> 	uuid->b[8] = (hash[8] & 0x3F) | 0x80;
> }
>+EXPORT_SYMBOL_GPL(tee_generate_uuid_v5);
>
> int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
> 				 const u8 connection_data[TEE_IOCTL_UUID_LEN])
>@@ -228,7 +229,7 @@ int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
> 		goto out_free_name;
> 	}
>
>-	uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
>+	tee_generate_uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
> out_free_name:
> 	kfree(name);
>
>diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h
>index bcb5418d6fdc..a3f4f88b8423 100644
>--- a/include/linux/tee_core.h
>+++ b/include/linux/tee_core.h
>@@ -272,6 +272,21 @@ void tee_device_set_dev_groups(struct tee_device *teedev,
> int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
> 				 const u8 connection_data[TEE_IOCTL_UUID_LEN]);
>
>+/**
>+ * tee_generate_uuid_v5() - Calculate UUIDv5
>+ * @uuid: Resulting UUID
>+ * @ns: Name space ID for UUIDv5 function
>+ * @name: Name for UUIDv5 function
>+ * @size: Size of name
>+ *
>+ * UUIDv5 is specific in RFC 4122.
>+ *
>+ * This implements section (for SHA-1):
>+ * 4.3.  Algorithm for Creating a Name-Based UUID
>+ */
>+void tee_generate_uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
>+			  size_t size);
>+
> /**
>  * struct tee_shm_pool - shared memory pool
>  * @ops:		operations
>
>-- 
>2.34.1
>