user/sven/linux.git/include/linux/tee_drv.h, branch v5.4.262

tee: export teedev_open() and teedev_close_context()

2022-03-02T10:41:04Z

commit 1e2c3ef0496e72ba9001da5fd1b7ed56ccb30597 upstream. Exports the two functions teedev_open() and teedev_close_context() in order to make it easier to create a driver internal struct tee_context. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander Signed-off-by: Greg Kroah-Hartman

tee: handle lookup of shm with reference count 0

2022-01-05T11:37:43Z

commit dfd0743f1d9ea76931510ed150334d571fbab49d upstream. Since the tee subsystem does not keep a strong reference to its idle shared memory buffers, it races with other threads that try to destroy a shared memory through a close of its dma-buf fd or by unmapping the memory. In tee_shm_get_from_id() when a lookup in teedev->idr has been successful, it is possible that the tee_shm is in the dma-buf teardown path, but that path is blocked by the teedev mutex. Since we don't have an API to tell if the tee_shm is in the dma-buf teardown path or not we must find another way of detecting this condition. Fix this by doing the reference counting directly on the tee_shm using a new refcount_t refcount field. dma-buf is replaced by using anon_inode_getfd() instead, this separates the life-cycle of the underlying file from the tee_shm. tee_shm_put() is updated to hold the mutex when decreasing the refcount to 0 and then remove the tee_shm from teedev->idr before releasing the mutex. This means that the tee_shm can never be found unless it has a refcount larger than 0. Fixes: 967c9cca2cc5 ("tee: generic TEE subsystem") Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman Reviewed-by: Lars Persson Reviewed-by: Sumit Garg Reported-by: Patrik Lantz [JW: backport to 5.4-stable] Signed-off-by: Jens Wiklander Signed-off-by: Greg Kroah-Hartman

tee: Correct inappropriate usage of TEE_SHM_DMA_BUF flag

2021-08-15T11:08:02Z

[ Upstream commit 376e4199e327a5cf29b8ec8fb0f64f3d8b429819 ] Currently TEE_SHM_DMA_BUF flag has been inappropriately used to not register shared memory allocated for private usage by underlying TEE driver: OP-TEE in this case. So rather add a new flag as TEE_SHM_PRIV that can be utilized by underlying TEE drivers for private allocation and usage of shared memory. With this corrected, allow tee_shm_alloc_kernel_buf() to allocate a shared memory region without the backing of dma-buf. Cc: stable@vger.kernel.org Signed-off-by: Sumit Garg Co-developed-by: Tyler Hicks Signed-off-by: Tyler Hicks Reviewed-by: Jens Wiklander Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander Signed-off-by: Sasha Levin

tee: add tee_shm_alloc_kernel_buf()

2021-08-12T11:21:01Z

commit dc7019b7d0e188d4093b34bd0747ed0d668c63bf upstream. Adds a new function tee_shm_alloc_kernel_buf() to allocate shared memory from a kernel driver. This function can later be made more lightweight by unnecessary dma-buf export. Cc: stable@vger.kernel.org Reviewed-by: Tyler Hicks Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander Signed-off-by: Greg Kroah-Hartman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282

2019-06-05T15:36:37Z

Based on 1 normalized pattern(s): this software is licensed under the terms of the gnu general public license version 2 as published by the free software foundation and may be copied distributed and modified under those terms this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 285 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de Signed-off-by: Greg Kroah-Hartman

tee: add cancellation support to client interface

2019-02-28T12:49:29Z

Add support of cancellation request to the TEE kernel internal client interface. Can be used by software TPM drivers, that leverage TEE under the hood (for instance TPM2.0 mobile profile), for requesting cancellation of time-consuming operations (RSA key-pair generation etc.). Signed-off-by: Igor Opaniuk Signed-off-by: Jens Wiklander

tee: add bus driver framework for TEE based devices

2019-02-01T14:12:46Z

Introduce a generic TEE bus driver concept for TEE based kernel drivers which would like to communicate with TEE based devices/services. Also add support in module device table for these new TEE based devices. In this TEE bus concept, devices/services are identified via Universally Unique Identifier (UUID) and drivers register a table of device UUIDs which they can support. So this TEE bus framework registers following apis: - match(): Iterates over the driver UUID table to find a corresponding match for device UUID. If a match is found, then this particular device is probed via corresponding probe api registered by the driver. This process happens whenever a device or a driver is registered with TEE bus. - uevent(): Notifies user-space (udev) whenever a new device is registered on this bus for auto-loading of modularized drivers. Also this framework allows for device enumeration to be specific to corresponding TEE implementation like OP-TEE etc. Signed-off-by: Sumit Garg Reviewed-by: Daniel Thompson Reviewed-by: Bhupesh Sharma Signed-off-by: Jens Wiklander

tee: add supp_nowait flag in tee_context struct

2019-02-01T14:12:46Z

This flag indicates that requests in this context should not wait for tee-supplicant daemon to be started if not present and just return with an error code. It is needed for requests which should be non-blocking in nature like ones arising from TEE based kernel drivers or any in kernel api that uses TEE internal client interface. Signed-off-by: Sumit Garg Reviewed-by: Daniel Thompson Signed-off-by: Jens Wiklander

tee: add kernel internal client interface

2018-08-24T09:57:37Z

Adds a kernel internal TEE client interface to be used by other drivers. Reviewed-by: Sumit Garg Tested-by: Sumit Garg Tested-by: Zeng Tao Signed-off-by: Jens Wiklander

Merge tag 'tee-drv-dynamic-shm+fixes-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee into next/drivers

2018-01-12T02:05:06Z

This pull request updates the previous tee-drv-dynamic-shm-for-v4.16 pull request with five new patches fixing review comments and errors. Apart from three small fixes there's two larger patches that in the end checks that memory to be registered really is normal cached memory. * tag 'tee-drv-dynamic-shm+fixes-for-v4.16' of https://git.linaro.org/people/jens.wiklander/linux-tee: tee: shm: Potential NULL dereference calling tee_shm_register() tee: shm: don't put_page on null shm->pages tee: shm: make function __tee_shm_alloc static tee: optee: check type of registered shared memory tee: add start argument to shm_register callback Signed-off-by: Olof Johansson