KEYS: trusted: tee: Make registered shm dependency explicit

TEE trusted keys support depends on registered shared memory support
since the key buffers are needed to be registered with OP-TEE. So make
that dependency explicit to not register trusted keys support if
underlying implementation doesn't support registered shared memory.

Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

Author: b49020

security/keys/trusted-keys/trusted_tee.c

@@ -219,7 +219,8 @@ static int trusted_tee_get_random(unsigned char *key, size_t key_len)
 
 static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
 {
-	if (ver->impl_id == TEE_IMPL_ID_OPTEE)
+	if (ver->impl_id == TEE_IMPL_ID_OPTEE &&
+	    ver->gen_caps & TEE_GEN_CAP_REG_MEM)
 		return 1;
 	else
 		return 0;