From: Sumit Garg <sumit.garg@linaro.org> To: keyrings@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Cc: jens.wiklander@linaro.org, corbet@lwn.net, dhowells@redhat.com, jejb@linux.ibm.com, jarkko.sakkinen@linux.intel.com, zohar@linux.ibm.com, jmorris@namei.org, serge@hallyn.com, ard.biesheuvel@linaro.org, daniel.thompson@linaro.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tee-dev@lists.linaro.org, Sumit Garg <sumit.garg@linaro.org> Subject: [RFC 3/7] tee: add private login method for kernel clients Date: Thu, 13 Jun 2019 10:42:29 +0000 [thread overview] Message-ID: <1560421833-27414-4-git-send-email-sumit.garg@linaro.org> (raw) In-Reply-To: <1560421833-27414-1-git-send-email-sumit.garg@linaro.org> There are use-cases where user-space shouldn't be allowed to communicate directly with a TEE device which is dedicated to provide a specific service for a kernel client. So add a private login method for kernel clients and disallow user-space to open-session using this login method. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> --- drivers/tee/tee_core.c | 6 ++++++ include/uapi/linux/tee.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 0f16d9f..4581bd1 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -334,6 +334,12 @@ static int tee_ioctl_open_session(struct tee_context *ctx, goto out; } + if (arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL) { + pr_err("login method not allowed for user-space client\n"); + rc = -EPERM; + goto out; + } + rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params); if (rc) goto out; diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index 4b9eb06..f33c69c 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -172,6 +172,8 @@ struct tee_ioctl_buf_data { #define TEE_IOCTL_LOGIN_APPLICATION 4 #define TEE_IOCTL_LOGIN_USER_APPLICATION 5 #define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6 +/* Private login method for REE kernel clients */ +#define TEE_IOCTL_LOGIN_REE_KERNEL 0x80000000 /** * struct tee_ioctl_param - parameter -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Sumit Garg <sumit.garg@linaro.org> To: keyrings@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Cc: jens.wiklander@linaro.org, corbet@lwn.net, dhowells@redhat.com, jejb@linux.ibm.com, jarkko.sakkinen@linux.intel.com, zohar@linux.ibm.com, jmorris@namei.org, serge@hallyn.com, ard.biesheuvel@linaro.org, daniel.thompson@linaro.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tee-dev@lists.linaro.org, Sumit Garg <sumit.garg@linaro.org> Subject: [RFC 3/7] tee: add private login method for kernel clients Date: Thu, 13 Jun 2019 16:00:29 +0530 [thread overview] Message-ID: <1560421833-27414-4-git-send-email-sumit.garg@linaro.org> (raw) In-Reply-To: <1560421833-27414-1-git-send-email-sumit.garg@linaro.org> There are use-cases where user-space shouldn't be allowed to communicate directly with a TEE device which is dedicated to provide a specific service for a kernel client. So add a private login method for kernel clients and disallow user-space to open-session using this login method. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> --- drivers/tee/tee_core.c | 6 ++++++ include/uapi/linux/tee.h | 2 ++ 2 files changed, 8 insertions(+) diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 0f16d9f..4581bd1 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -334,6 +334,12 @@ static int tee_ioctl_open_session(struct tee_context *ctx, goto out; } + if (arg.clnt_login == TEE_IOCTL_LOGIN_REE_KERNEL) { + pr_err("login method not allowed for user-space client\n"); + rc = -EPERM; + goto out; + } + rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params); if (rc) goto out; diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index 4b9eb06..f33c69c 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -172,6 +172,8 @@ struct tee_ioctl_buf_data { #define TEE_IOCTL_LOGIN_APPLICATION 4 #define TEE_IOCTL_LOGIN_USER_APPLICATION 5 #define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6 +/* Private login method for REE kernel clients */ +#define TEE_IOCTL_LOGIN_REE_KERNEL 0x80000000 /** * struct tee_ioctl_param - parameter -- 2.7.4
next prev parent reply other threads:[~2019-06-13 10:42 UTC|newest] Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-13 10:30 [RFC 0/7] Introduce TEE based Trusted Keys support Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 10:30 ` [RFC 1/7] tee: optee: allow kernel pages to register as shm Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 15:12 ` Jarkko Sakkinen 2019-06-13 15:12 ` Jarkko Sakkinen 2019-06-13 15:17 ` Jarkko Sakkinen 2019-06-13 15:17 ` Jarkko Sakkinen 2019-06-13 15:17 ` Jarkko Sakkinen 2019-06-13 15:17 ` Jarkko Sakkinen 2019-06-14 5:12 ` Sumit Garg 2019-06-14 5:24 ` Sumit Garg 2019-06-14 8:15 ` Jens Wiklander 2019-06-14 8:15 ` Jens Wiklander 2019-06-13 10:30 ` [RFC 2/7] tee: enable support to register kernel memory Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 15:20 ` Jarkko Sakkinen 2019-06-13 15:20 ` Jarkko Sakkinen 2019-06-14 5:13 ` Sumit Garg 2019-06-14 5:25 ` Sumit Garg 2019-06-14 8:16 ` Jens Wiklander 2019-06-14 8:16 ` Jens Wiklander 2019-06-13 10:30 ` Sumit Garg [this message] 2019-06-13 10:42 ` [RFC 3/7] tee: add private login method for kernel clients Sumit Garg 2019-07-08 15:39 ` Jens Wiklander 2019-07-08 15:39 ` Jens Wiklander 2019-07-09 5:56 ` Sumit Garg 2019-07-09 5:56 ` Sumit Garg 2019-07-09 7:03 ` Jens Wiklander 2019-07-09 7:03 ` Jens Wiklander 2019-07-09 9:36 ` Sumit Garg 2019-07-09 9:48 ` Sumit Garg 2019-07-29 7:08 ` Jens Wiklander 2019-07-29 7:08 ` Jens Wiklander 2019-07-29 13:13 ` Sumit Garg 2019-07-29 13:25 ` Sumit Garg 2019-06-13 10:30 ` [RFC 4/7] KEYS: trusted: Introduce TEE based Trusted Keys Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 15:32 ` Jarkko Sakkinen 2019-06-13 15:32 ` Jarkko Sakkinen 2019-06-14 5:43 ` Sumit Garg 2019-06-14 5:55 ` Sumit Garg 2019-06-13 10:30 ` [RFC 5/7] KEYS: encrypted: Allow TEE based trusted master keys Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 10:30 ` [RFC 6/7] doc: keys: Document usage of TEE based Trusted Keys Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 15:34 ` Jarkko Sakkinen 2019-06-13 15:34 ` Jarkko Sakkinen 2019-06-14 5:37 ` Sumit Garg 2019-06-14 5:49 ` Sumit Garg 2019-06-14 15:36 ` Jarkko Sakkinen 2019-06-14 15:36 ` Jarkko Sakkinen 2019-06-13 10:30 ` [RFC 7/7] MAINTAINERS: Add entry for " Sumit Garg 2019-06-13 10:42 ` Sumit Garg 2019-06-13 16:40 ` [RFC 0/7] Introduce TEE based Trusted Keys support Casey Schaufler 2019-06-13 16:40 ` Casey Schaufler 2019-06-14 0:03 ` Mimi Zohar 2019-06-14 0:03 ` Mimi Zohar 2019-06-14 8:17 ` Sumit Garg 2019-06-14 8:29 ` Sumit Garg 2019-06-14 5:58 ` Sumit Garg 2019-06-14 5:58 ` Sumit Garg 2019-07-08 12:41 ` Sumit Garg 2019-07-08 12:53 ` Sumit Garg 2019-07-08 16:31 ` Jens Wiklander 2019-07-08 16:31 ` Jens Wiklander 2019-07-09 5:58 ` Sumit Garg 2019-07-09 5:59 ` Sumit Garg
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