diff options
| author | Sumit Garg <sumit.garg@linaro.org> | 2020-03-27 10:59:48 +0530 |
|---|---|---|
| committer | Jens Wiklander <jens.wiklander@linaro.org> | 2020-04-20 16:18:14 +0200 |
| commit | 104edb94cc4b3101bab33161cd861de13e85610b (patch) | |
| tree | e6e859e3fa56f4e9a476224681dc4a021b6c9f01 | |
| parent | 2a6ba3f794e892c37d67b8ebb19487ce105eabc2 (diff) | |
| download | linux-stable-104edb94cc4b3101bab33161cd861de13e85610b.tar.gz linux-stable-104edb94cc4b3101bab33161cd861de13e85610b.tar.bz2 linux-stable-104edb94cc4b3101bab33161cd861de13e85610b.zip | |
tee: add private login method for kernel clients
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>
| -rw-r--r-- | drivers/tee/tee_core.c | 7 | ||||
| -rw-r--r-- | include/uapi/linux/tee.h | 9 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 6aec502c495c..fb907bf43708 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -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; diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index 6596f3a09e54..b619f37ee03e 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -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 |