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[PATCH v12 0/9] TEE subsystem for protected dma-buf allocations

by Jens Wiklander

Hi, This patch set allocates the protected DMA-bufs from a DMA-heap instantiated from the TEE subsystem. The TEE subsystem handles the DMA-buf allocations since it is the TEE (OP-TEE, AMD-TEE, TS-TEE, or perhaps a future QTEE) which sets up the protection for the memory used for the DMA-bufs. The DMA-heap uses a protected memory pool provided by the backend TEE driver, allowing it to choose how to allocate the protected physical memory. The allocated DMA-bufs must be imported with a new TEE_IOC_SHM_REGISTER_FD before they can be passed as arguments when requesting services from the secure world. Three use-cases (Secure Video Playback, Trusted UI, and Secure Video Recording) have been identified so far to serve as examples of what can be expected. The use-cases have predefined DMA-heap names, "protected,secure-video", "protected,trusted-ui", and "protected,secure-video-record". The backend driver registers protected memory pools for the use-cases it supports. Each use-case has its own protected memory pool since different use-cases require isolation from different parts of the system. A protected memory pool can be based on a static carveout instantiated while probing the TEE backend driver, or dynamically allocated from CMA (dma_alloc_pages()) and made protected as needed by the TEE. This can be tested on a RockPi 4B+ with the following steps: repo init -u https://github.com/jenswi-linaro/manifest.git -m rockpi4.xml \ -b prototype/sdp-v12 repo sync -j8 cd build make toolchains -j$(nproc) make all -j$(nproc) # Copy ../out/rockpi4.img to an SD card and boot the RockPi from that # Connect a monitor to the RockPi # login and at the prompt: gst-launch-1.0 videotestsrc ! \ aesenc key=1f9423681beb9a79215820f6bda73d0f \ iv=e9aa8e834d8d70b7e0d254ff670dd718 serialize-iv=true ! \ aesdec key=1f9423681beb9a79215820f6bda73d0f ! \ kmssink The aesdec module has been hacked to use an OP-TEE TA to decrypt the stream into protected DMA-bufs which are consumed by the kmssink. The primitive QEMU tests from previous patch sets can be tested on RockPi in the same way using: xtest --sdp-basic The primitive tests are tested on QEMU with the following steps: repo init -u https://github.com/jenswi-linaro/manifest.git -m qemu_v8.xml \ -b prototype/sdp-v12 repo sync -j8 cd build make toolchains -j$(nproc) make SPMC_AT_EL=1 all -j$(nproc) make SPMC_AT_EL=1 run-only # login and at the prompt: xtest --sdp-basic The SPMC_AT_EL=1 parameter configures the build with FF-A and an SPMC at S-EL1 inside OP-TEE. The parameter can be changed to SPMC_AT_EL=n to test without FF-A using the original SMC ABI instead. Please remember to do %make arm-tf-clean for TF-A to be rebuilt properly using the new configuration. https://optee.readthedocs.io/en/latest/building/prerequisites.html list dependencies required to build the above. The primitive tests are pretty basic, mostly checking that a Trusted Application in the secure world can access and manipulate the memory. There are also some negative tests for out of bounds buffers, etc. Thanks, Jens Changes since V11: * In "dma-buf: dma-heap: export declared functions": - use EXPORT_SYMBOL_NS_GPL() - Added TJ's R-B and Sumit's Ack * In "tee: implement protected DMA-heap", import the namespaces "DMA_BUF" and "DMA_BUF_HEAP" as needed. Changes since V10: * Changed the new ABI OPTEE_MSG_CMD_GET_PROTMEM_CONFIG to report a list of u32 memory attributes instead of u16 endpoints to make room for both endpoint and access permissions in each entry. * In "tee: new ioctl to a register tee_shm from a dmabuf file descriptor", remove the unused path for DMA-bufs allocated by other means than the on in the TEE SS. * In "tee: implement protected DMA-heap", handle unloading of the backend driver module implementing the heap. The heap is reference counted and also calls tee_device_get() to guarantee that the module remains available while the heap is instantiated. * In "optee: support protected memory allocation", use dma_coerce_mask_and_coherent() instead of open-coding the function. * Added Sumit's R-B to - "optee: smc abi: dynamic protected memory allocation" - "optee: FF-A: dynamic protected memory allocation" - "optee: support protected memory allocation" - "tee: implement protected DMA-heap" - "dma-buf: dma-heap: export declared functions" Changes since V9: * Adding Sumit's R-B to "optee: sync secure world ABI headers" * Update commit message as requested for "dma-buf: dma-heap: export declared functions". * In "tee: implement protected DMA-heap": - add the hidden config option TEE_DMABUF_HEAPS to tell if the TEE subsystem can support DMA heaps - add a pfn_valid() to check that the passed physical address can be used by __pfn_to_page() and friends - remove the memremap() call, the caller is should do that instead if needed * In "tee: add tee_shm_alloc_dma_mem()" guard the calls to dma_alloc_pages() and dma_free_pages() with TEE_DMABUF_HEAPS to avoid linking errors in some configurations * In "optee: support protected memory allocation": - add the hidden config option OPTEE_STATIC_PROTMEM_POOL to tell if the driver can support a static protected memory pool - optee_protmem_pool_init() is slightly refactored to make the patches that follow easier - Call devm_memremap() before calling tee_protmem_static_pool_alloc() Changes since V8: * Using dma_alloc_pages() instead of cma_alloc() so the direct dependency on CMA can be removed together with the patches "cma: export cma_alloc() and cma_release()" and "dma-contiguous: export dma_contiguous_default_area". The patch * Renaming the patch "tee: add tee_shm_alloc_cma_phys_mem()" to "tee: add tee_shm_alloc_dma_mem()" * Setting DMA mask for the OP-TEE TEE device based on input from the secure world instead of relying on the parent device so following patches are removed: "tee: tee_device_alloc(): copy dma_mask from parent device" and "optee: pass parent device to tee_device_alloc()". * Adding Sumit Garg's R-B to "tee: refactor params_from_user()" * In the patch "tee: implement protected DMA-heap", map the physical memory passed to tee_protmem_static_pool_alloc(). Changes since V7: * Adding "dma-buf: dma-heap: export declared functions", "cma: export cma_alloc() and cma_release()", and "dma-contiguous: export dma_contiguous_default_area" to export the symbols needed to keep the TEE subsystem as a load module. * Removing CONFIG_TEE_DMABUF_HEAP and CONFIG_TEE_CMA since they aren't needed any longer. * Addressing review comments in "optee: sync secure world ABI headers" * Better align protected memory pool initialization between the smc-abi and ffa-abi parts of the optee driver. * Removing the patch "optee: account for direction while converting parameters" Changes since V6: * Restricted memory is now known as protected memory since to use the same term as https://docs.vulkan.org/guide/latest/protected.html. Update all patches to consistently use protected memory. * In "tee: implement protected DMA-heap" add the hidden config option TEE_DMABUF_HEAP to tell if the DMABUF_HEAPS functions are available for the TEE subsystem * Adding "tee: refactor params_from_user()", broken out from the patch "tee: new ioctl to a register tee_shm from a dmabuf file descriptor" * For "tee: new ioctl to a register tee_shm from a dmabuf file descriptor": - Update commit message to mention protected memory - Remove and open code tee_shm_get_parent_shm() in param_from_user_memref() * In "tee: add tee_shm_alloc_cma_phys_mem" add the hidden config option TEE_CMA to tell if the CMA functions are available for the TEE subsystem * For "tee: tee_device_alloc(): copy dma_mask from parent device" and "optee: pass parent device to tee_device_alloc", added Reviewed-by: Sumit Garg <sumit.garg(a)kernel.org> Changes since V5: * Removing "tee: add restricted memory allocation" and "tee: add TEE_IOC_RSTMEM_FD_INFO" * Adding "tee: implement restricted DMA-heap", "tee: new ioctl to a register tee_shm from a dmabuf file descriptor", "tee: add tee_shm_alloc_cma_phys_mem()", "optee: pass parent device to tee_device_alloc()", and "tee: tee_device_alloc(): copy dma_mask from parent device" * The two TEE driver OPs "rstmem_alloc()" and "rstmem_free()" are replaced with a struct tee_rstmem_pool abstraction. * Replaced the the TEE_IOC_RSTMEM_ALLOC user space API with the DMA-heap API Changes since V4: * Adding the patch "tee: add TEE_IOC_RSTMEM_FD_INFO" needed by the GStreamer demo * Removing the dummy CPU access and mmap functions from the dma_buf_ops * Fixing a compile error in "optee: FF-A: dynamic restricted memory allocation" reported by kernel test robot <lkp(a)intel.com> Changes since V3: * Make the use_case and flags field in struct tee_shm u32's instead of u16's * Add more description for TEE_IOC_RSTMEM_ALLOC in the header file * Import namespace DMA_BUF in module tee, reported by lkp(a)intel.com * Added a note in the commit message for "optee: account for direction while converting parameters" why it's needed * Factor out dynamic restricted memory allocation from "optee: support restricted memory allocation" into two new commits "optee: FF-A: dynamic restricted memory allocation" and "optee: smc abi: dynamic restricted memory allocation" * Guard CMA usage with #ifdef CONFIG_CMA, effectively disabling dynamic restricted memory allocate if CMA isn't configured Changes since the V2 RFC: * Based on v6.12 * Replaced the flags for SVP and Trusted UID memory with a u32 field with unique id for each use case * Added dynamic allocation of restricted memory pools * Added OP-TEE ABI both with and without FF-A for dynamic restricted memory * Added support for FF-A with FFA_LEND Changes since the V1 RFC: * Based on v6.11 * Complete rewrite, replacing the restricted heap with TEE_IOC_RSTMEM_ALLOC Changes since Olivier's post [2]: * Based on Yong Wu's post [1] where much of dma-buf handling is done in the generic restricted heap * Simplifications and cleanup * New commit message for "dma-buf: heaps: add Linaro restricted dmabuf heap support" * Replaced the word "secure" with "restricted" where applicable Etienne Carriere (1): tee: new ioctl to a register tee_shm from a dmabuf file descriptor Jens Wiklander (8): optee: sync secure world ABI headers dma-buf: dma-heap: export declared functions tee: implement protected DMA-heap tee: refactor params_from_user() tee: add tee_shm_alloc_dma_mem() optee: support protected memory allocation optee: FF-A: dynamic protected memory allocation optee: smc abi: dynamic protected memory allocation drivers/dma-buf/dma-heap.c | 4 + drivers/tee/Kconfig | 5 + drivers/tee/Makefile | 1 + drivers/tee/optee/Kconfig | 5 + drivers/tee/optee/Makefile | 1 + drivers/tee/optee/core.c | 7 + drivers/tee/optee/ffa_abi.c | 146 ++++++++- drivers/tee/optee/optee_ffa.h | 27 +- drivers/tee/optee/optee_msg.h | 84 ++++- drivers/tee/optee/optee_private.h | 15 +- drivers/tee/optee/optee_smc.h | 37 ++- drivers/tee/optee/protmem.c | 335 ++++++++++++++++++++ drivers/tee/optee/smc_abi.c | 141 ++++++++- drivers/tee/tee_core.c | 158 +++++++--- drivers/tee/tee_heap.c | 500 ++++++++++++++++++++++++++++++ drivers/tee/tee_private.h | 14 + drivers/tee/tee_shm.c | 157 +++++++++- include/linux/tee_core.h | 59 ++++ include/linux/tee_drv.h | 10 + include/uapi/linux/tee.h | 31 ++ 20 files changed, 1670 insertions(+), 67 deletions(-) create mode 100644 drivers/tee/optee/protmem.c create mode 100644 drivers/tee/tee_heap.c base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9 -- 2.43.0

5 months, 4 weeks

4
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[GIT PULL] TEE QTEE fixes for v6.18

by Jens Wiklander

Hello arm-soc maintainers, Please pull these small fixes for the TEE QTEE driver introduced in v6.18 merge window. Thanks, Jens The following changes since commit dcc7a571a3665a16581b5b18ca6b113f60a9a41a: Documentation: tee: Add Qualcomm TEE driver (2025-09-15 17:34:06 +0200) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git tags/tee-qcomtee-fixes-for-v6.18 for you to fetch changes up to 3b63efa21bc6acc1a0fadd1dd0f0e1988a4c0177: tee: QCOMTEE should depend on ARCH_QCOM (2025-10-02 08:31:10 +0200) ---------------------------------------------------------------- TEE QTEE fixes for v6.18 - Adds ARCH_QCOM dependency for the QTEE driver - Fixing return values for copy_from_user() failures - Guarding against potential off by one read ---------------------------------------------------------------- Dan Carpenter (2): tee: qcom: prevent potential off by one read tee: qcom: return -EFAULT instead of -EINVAL if copy_from_user() fails Geert Uytterhoeven (1): tee: QCOMTEE should depend on ARCH_QCOM drivers/tee/qcomtee/Kconfig | 1 + drivers/tee/qcomtee/call.c | 2 +- drivers/tee/qcomtee/core.c | 2 +- 3 files changed, 3 insertions(+), 2 deletions(-)

5 months, 4 weeks

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[PATCH] tee: qcom: depend on ARCH_QCOM

by Peter Robinson

Add a dependency on ARCH_QCOM, and compile test, as the driver depnds on QCom specific Trusted Applications (TAs) and it's only, currently at least, supported on QCom hardware. Fixes: d6e290837e50f ("tee: add Qualcomm TEE driver") Signed-off-by: Peter Robinson <pbrobinson(a)gmail.com> --- drivers/tee/qcomtee/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tee/qcomtee/Kconfig b/drivers/tee/qcomtee/Kconfig index 927686abceb15..9f19dee08db49 100644 --- a/drivers/tee/qcomtee/Kconfig +++ b/drivers/tee/qcomtee/Kconfig @@ -2,6 +2,7 @@ # Qualcomm Trusted Execution Environment Configuration config QCOMTEE tristate "Qualcomm TEE Support" + depends on ARCH_QCOM || COMPILE_TEST depends on !CPU_BIG_ENDIAN select QCOM_SCM select QCOM_TZMEM_MODE_SHMBRIDGE -- 2.51.0

5 months, 4 weeks

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[PATCH] tee: QCOMTEE should depend on ARCH_QCOM

by Geert Uytterhoeven

The Qualcomm Trusted Execution Environment (QTEE) is only available on Qualcomm SoCs. Hence add a dependency on ARCH_QCOM, to prevent asking the user about this driver when configuring a kernel without Qualcomm platform support. Fixes: d6e290837e50f73f ("tee: add Qualcomm TEE driver") Signed-off-by: Geert Uytterhoeven <geert+renesas(a)glider.be> --- drivers/tee/qcomtee/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tee/qcomtee/Kconfig b/drivers/tee/qcomtee/Kconfig index 927686abceb1536e..9f19dee08db491c3 100644 --- a/drivers/tee/qcomtee/Kconfig +++ b/drivers/tee/qcomtee/Kconfig @@ -2,6 +2,7 @@ # Qualcomm Trusted Execution Environment Configuration config QCOMTEE tristate "Qualcomm TEE Support" + depends on ARCH_QCOM || COMPILE_TEST depends on !CPU_BIG_ENDIAN select QCOM_SCM select QCOM_TZMEM_MODE_SHMBRIDGE -- 2.43.0

5 months, 4 weeks

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[PATCH] MAINTAINERS: Mark the OP-TEE mailing list moderated

by Geert Uytterhoeven

After sending a patch to op-tee(a)lists.trustedfirmware.org, I got the typical response for a moderated list: Your mail to 'op-tee(a)lists.trustedfirmware.org' with the subject [...] Is being held until the list moderator can review it for approval. The message is being held because: The message is not from a list member Either the message will get posted to the list, or you will receive notification of the moderator's decision. Mark this mailing list moderated in MAINTAINERS. Signed-off-by: Geert Uytterhoeven <geert+renesas(a)glider.be> --- MAINTAINERS | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/MAINTAINERS b/MAINTAINERS index fc755a50fb150498..5aa2e501231f2aa6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -19115,14 +19115,14 @@ F: drivers/net/phy/ncn* OP-TEE DRIVER M: Jens Wiklander <jens.wiklander(a)linaro.org> -L: op-tee(a)lists.trustedfirmware.org +L: op-tee(a)lists.trustedfirmware.org (moderated for non-subscribers) S: Maintained F: Documentation/ABI/testing/sysfs-bus-optee-devices F: drivers/tee/optee/ OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER M: Sumit Garg <sumit.garg(a)kernel.org> -L: op-tee(a)lists.trustedfirmware.org +L: op-tee(a)lists.trustedfirmware.org (moderated for non-subscribers) S: Maintained F: drivers/char/hw_random/optee-rng.c @@ -25116,7 +25116,7 @@ F: include/media/i2c/tw9910.h TEE SUBSYSTEM M: Jens Wiklander <jens.wiklander(a)linaro.org> R: Sumit Garg <sumit.garg(a)kernel.org> -L: op-tee(a)lists.trustedfirmware.org +L: op-tee(a)lists.trustedfirmware.org (moderated for non-subscribers) S: Maintained F: Documentation/ABI/testing/sysfs-class-tee F: Documentation/driver-api/tee.rst -- 2.43.0

6 months

2
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[PATCH next] tee: qcom: prevent potential off by one read

by Dan Carpenter

Re-order these checks to check if "i" is a valid array index before using it. This prevents a potential off by one read access. Fixes: d6e290837e50 ("tee: add Qualcomm TEE driver") Signed-off-by: Dan Carpenter <dan.carpenter(a)linaro.org> --- drivers/tee/qcomtee/call.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tee/qcomtee/call.c b/drivers/tee/qcomtee/call.c index cc17a48d0ab7..ac134452cc9c 100644 --- a/drivers/tee/qcomtee/call.c +++ b/drivers/tee/qcomtee/call.c @@ -308,7 +308,7 @@ static int qcomtee_params_from_args(struct tee_param *params, } /* Release any IO and OO objects not processed. */ - for (; u[i].type && i < num_params; i++) { + for (; i < num_params && u[i].type; i++) { if (u[i].type == QCOMTEE_ARG_TYPE_OO || u[i].type == QCOMTEE_ARG_TYPE_IO) qcomtee_object_put(u[i].o); -- 2.51.0

6 months

4
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[GIT PULL] TEE fix2 for v6.17

by Jens Wiklander

Hello arm-soc maintainers, Please pull this fix in the TEE subsystem. Thanks, Jens The following changes since commit 8f5ae30d69d7543eee0d70083daf4de8fe15d585: Linux 6.17-rc1 (2025-08-10 19:41:16 +0300) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/jenswi/linux-tee.git tags/tee-shm-register-fix-for-v6.17 for you to fetch changes up to d5cf5b37064b1699d946e8b7ab4ac7d7d101814c: tee: fix register_shm_helper() (2025-09-22 08:47:00 +0200) ---------------------------------------------------------------- TEE fix2 for v6.17 Fixing incorrect error handling for a call to iov_iter_extract_pages(). ---------------------------------------------------------------- Jens Wiklander (1): tee: fix register_shm_helper() drivers/tee/tee_shm.c | 8 ++++++++ 1 file changed, 8 insertions(+)

6 months, 1 week

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[PATCH v2] tee: fix register_shm_helper()

by Jens Wiklander

In register_shm_helper(), fix incorrect error handling for a call to iov_iter_extract_pages(). A case is missing for when iov_iter_extract_pages() only got some pages and return a number larger than 0, but not the requested amount. This fixes a possible NULL pointer dereference following a bad input from ioctl(TEE_IOC_SHM_REGISTER) where parts of the buffer isn't mapped. Cc: stable(a)vger.kernel.org Reported-by: Masami Ichikawa <masami256(a)gmail.com> Closes: https://lore.kernel.org/op-tee/CACOXgS-Bo2W72Nj1_44c7bntyNYOavnTjJAvUbEiQfq… Tested-by: Masami Ichikawa <masami256(a)gmail.com> Fixes: 7bdee4157591 ("tee: Use iov_iter to better support shared buffer registration") Signed-off-by: Jens Wiklander <jens.wiklander(a)linaro.org> --- Changes from v1 - Refactor the if statement as requested by Sumit - Adding Tested-by: Masami Ichikawa <masami256(a)gmail.com - Link to v1: https://lore.kernel.org/op-tee/20250919124217.2934718-1-jens.wiklander@lina… --- drivers/tee/tee_shm.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index daf6e5cfd59a..76c54e1dc98c 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -319,6 +319,14 @@ register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags, if (unlikely(len <= 0)) { ret = len ? ERR_PTR(len) : ERR_PTR(-ENOMEM); goto err_free_shm_pages; + } else if (DIV_ROUND_UP(len + off, PAGE_SIZE) != num_pages) { + /* + * If we only got a few pages, update to release the + * correct amount below. + */ + shm->num_pages = len / PAGE_SIZE; + ret = ERR_PTR(-ENOMEM); + goto err_put_shm_pages; } /* -- 2.43.0

6 months, 1 week

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Linaro OP-TEE Contribution, LOC, monthly meeting September 23

by Jens Wiklander

Hi, Tomorrow, Tuesday, it's time for another LOC monthly meeting. For time and connection details, see the calendar at https://www.trustedfirmware.org/meetings/ - Pull request for the Secure Data Path patchset [1], accepted by arm-soc [2] - Pull request for the QCOMTEE driver patchset [3] has not been accepted yet. It also has a few error reports or patches pending since it was included in Linux-next Are there any other topics? Cheers, Jens [1] https://lore.kernel.org/op-tee/20250912101752.GA1453408@rayden/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/commit/?id=8204… [3] https://lore.kernel.org/op-tee/20250915174957.GA2040478@rayden/

6 months, 1 week

1
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[PATCH] tee: fix register_shm_helper()

by Jens Wiklander

In register_shm_helper(), fix incorrect error handling for a call to iov_iter_extract_pages(). A case is missing for when iov_iter_extract_pages() only got some pages and return a number larger than 0, but not the requested amount. This fixes a possible NULL pointer dereference following a bad input from ioctl(TEE_IOC_SHM_REGISTER) where parts of the buffer isn't mapped. Cc: stable(a)vger.kernel.org Reported-by: Masami Ichikawa <masami256(a)gmail.com> Closes: https://lore.kernel.org/op-tee/CACOXgS-Bo2W72Nj1_44c7bntyNYOavnTjJAvUbEiQfq… Fixes: 7bdee4157591 ("tee: Use iov_iter to better support shared buffer registration") Signed-off-by: Jens Wiklander <jens.wiklander(a)linaro.org> --- drivers/tee/tee_shm.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index daf6e5cfd59a..6ed7d030f4ed 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -316,7 +316,16 @@ register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags, len = iov_iter_extract_pages(iter, &shm->pages, LONG_MAX, num_pages, 0, &off); - if (unlikely(len <= 0)) { + if (DIV_ROUND_UP(len + off, PAGE_SIZE) != num_pages) { + if (len > 0) { + /* + * If we only got a few pages, update to release + * the correct amount below. + */ + shm->num_pages = len / PAGE_SIZE; + ret = ERR_PTR(-ENOMEM); + goto err_put_shm_pages; + } ret = len ? ERR_PTR(len) : ERR_PTR(-ENOMEM); goto err_free_shm_pages; } -- 2.43.0

6 months, 1 week

3
3
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