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tee: add private login method for kernel clients

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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 GP implementation
defined login method range: (0x80000000 - 0xBFFFFFFF).

Reviewed-by: Jerome Forissier <jerome@forissier.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Sumit Garg 2020-03-27 10:59:48 +05:30 committed by Jens Wiklander
parent 2a6ba3f794
commit 104edb94cc
2 changed files with 16 additions and 0 deletions
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7
drivers/tee/tee_core.c
View file

@ -333,6 +333,13 @@ static int tee_ioctl_open_session(struct tee_context *ctx,
goto out;
}
if (arg.clnt_login >= TEE_IOCTL_LOGIN_REE_KERNEL_MIN &&
arg.clnt_login <= TEE_IOCTL_LOGIN_REE_KERNEL_MAX) {
pr_debug("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;

9
include/uapi/linux/tee.h
View file

@ -173,6 +173,15 @@ 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
/*
* Disallow user-space to use GP implementation specific login
* method range (0x80000000 - 0xBFFFFFFF). This range is rather
* being reserved for REE kernel clients or TEE implementation.
*/
#define TEE_IOCTL_LOGIN_REE_KERNEL_MIN 0x80000000
#define TEE_IOCTL_LOGIN_REE_KERNEL_MAX 0xBFFFFFFF
/* Private login method for REE kernel clients */
#define TEE_IOCTL_LOGIN_REE_KERNEL 0x80000000
/**
* struct tee_ioctl_param - parameter