January 2025 - OP-TEE - lists.trustedfirmware.org

[PATCH v4 0/6] TEE subsystem for restricted dma-buf allocations

by Jens Wiklander

Hi, This patch set allocates the restricted DMA-bufs via 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 QCOMTEE) which sets up the restrictions for the memory used for the DMA-bufs. I've added a new IOCTL, TEE_IOC_RSTMEM_ALLOC, to allocate the restricted DMA-bufs. This IOCTL reaches the backend TEE driver, allowing it to choose how to allocate the restricted physical memory. TEE_IOC_RSTMEM_ALLOC takes in addition to a size and flags parameters also a use-case parameter. This is used by the backend TEE driver to decide on allocation policy and which devices should be able to access the memory. Three use-cases (Secure Video Playback, Trusted UI, and Secure Video Recording) has been identified so far to serve as examples of what can be expected. More use-cases can be added in userspace ABI, but it's up to the backend TEE drivers to provide the implementation. Each use-case has it's own restricted memory pool since different use-cases requires isolation from different parts of the system. A restricted memory pool can be based on a static carveout instantiated while probing the TEE backend driver, or dynamically allocated from CMA and made restricted as needed by the TEE. This can be tested on QEMU with the following steps: repo init -u https://github.com/jenswi-linaro/manifest.git -m qemu_v8.xml \ -b prototype/sdp-v4 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 into SPMC_AT_EL=n to test without FF-A using the original SMC ABI instead. Please remember to do %rm -rf ../trusted-firmware-a/build/qemu for TF-A to be rebuilt properly using the new configuration. https://optee.readthedocs.io/en/latest/building/prerequisites.html list dependencies needed to build the above. The 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 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 Jens Wiklander (6): tee: add restricted memory allocation optee: account for direction while converting parameters optee: sync secure world ABI headers optee: support restricted memory allocation optee: FF-A: dynamic restricted memory allocation optee: smc abi: dynamic restricted memory allocation drivers/tee/Makefile | 1 + drivers/tee/optee/Makefile | 1 + drivers/tee/optee/call.c | 10 +- drivers/tee/optee/core.c | 1 + drivers/tee/optee/ffa_abi.c | 178 +++++++++++++- drivers/tee/optee/optee_ffa.h | 27 ++- drivers/tee/optee/optee_msg.h | 65 ++++- drivers/tee/optee/optee_private.h | 75 ++++-- drivers/tee/optee/optee_smc.h | 71 +++++- drivers/tee/optee/rpc.c | 31 ++- drivers/tee/optee/rstmem.c | 388 ++++++++++++++++++++++++++++++ drivers/tee/optee/smc_abi.c | 213 ++++++++++++++-- drivers/tee/tee_core.c | 38 ++- drivers/tee/tee_private.h | 2 + drivers/tee/tee_rstmem.c | 201 ++++++++++++++++ drivers/tee/tee_shm.c | 2 + drivers/tee/tee_shm_pool.c | 69 +++++- include/linux/tee_core.h | 15 ++ include/linux/tee_drv.h | 2 + include/uapi/linux/tee.h | 44 +++- 20 files changed, 1358 insertions(+), 76 deletions(-) create mode 100644 drivers/tee/optee/rstmem.c create mode 100644 drivers/tee/tee_rstmem.c base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 -- 2.43.0

2 weeks, 6 days

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[PATCH] tee: optee: Add support for supplicant timeout

by Sumit Garg

OP-TEE supplicant is a user-space daemon and it's possible for it being crashed or killed in the middle of processing an OP-TEE RPC call. It becomes more complicated when there is incorrect shutdown ordering of the supplicant process vs the OP-TEE client application which can eventually lead to system hang-up waiting for the closure of the client application. In order to gracefully handle this scenario, let's add a long enough timeout to wait for supplicant to process requests. In case there is a timeout then we return a proper error code for the RPC request. Signed-off-by: Sumit Garg <sumit.garg(a)linaro.org> --- drivers/tee/optee/supp.c | 58 +++++++++++++++++++++++++--------------- 1 file changed, 36 insertions(+), 22 deletions(-) diff --git a/drivers/tee/optee/supp.c b/drivers/tee/optee/supp.c index 322a543b8c27..92e86ac4cdd4 100644 --- a/drivers/tee/optee/supp.c +++ b/drivers/tee/optee/supp.c @@ -7,6 +7,15 @@ #include <linux/uaccess.h> #include "optee_private.h" +/* + * OP-TEE supplicant timeout, the user-space supplicant may get + * crashed or killed while servicing an RPC call. This will just lead + * to OP-TEE client hung indefinitely just waiting for supplicant to + * serve requests which isn't expected. It is rather expected to fail + * gracefully with a timeout which is long enough. + */ +#define SUPP_TIMEOUT (msecs_to_jiffies(10000)) + struct optee_supp_req { struct list_head link; @@ -52,8 +61,10 @@ void optee_supp_release(struct optee_supp *supp) /* Abort all queued requests */ list_for_each_entry_safe(req, req_tmp, &supp->reqs, link) { - list_del(&req->link); - req->in_queue = false; + if (req->in_queue) { + list_del(&req->link); + req->in_queue = false; + } req->ret = TEEC_ERROR_COMMUNICATION; complete(&req->c); } @@ -82,6 +93,7 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, struct optee_supp_req *req; bool interruptable; u32 ret; + int res = 1; /* * Return in case there is no supplicant available and @@ -108,28 +120,28 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, /* Tell an eventual waiter there's a new request */ complete(&supp->reqs_c); - /* - * Wait for supplicant to process and return result, once we've - * returned from wait_for_completion(&req->c) successfully we have - * exclusive access again. - */ - while (wait_for_completion_interruptible(&req->c)) { + /* Wait for supplicant to process and return result */ + while (res) { + res = wait_for_completion_interruptible_timeout(&req->c, + SUPP_TIMEOUT); + /* Check if supplicant served the request */ + if (res > 0) + break; + mutex_lock(&supp->mutex); + /* + * There's no supplicant available and since the supp->mutex + * currently is held none can become available until the mutex + * released again. + * + * Interrupting an RPC to supplicant is only allowed as a way + * of slightly improving the user experience in case the + * supplicant hasn't been started yet. During normal operation + * the supplicant will serve all requests in a timely manner and + * interrupting then wouldn't make sense. + */ interruptable = !supp->ctx; - if (interruptable) { - /* - * There's no supplicant available and since the - * supp->mutex currently is held none can - * become available until the mutex released - * again. - * - * Interrupting an RPC to supplicant is only - * allowed as a way of slightly improving the user - * experience in case the supplicant hasn't been - * started yet. During normal operation the supplicant - * will serve all requests in a timely manner and - * interrupting then wouldn't make sense. - */ + if (interruptable || (res == 0)) { if (req->in_queue) { list_del(&req->link); req->in_queue = false; @@ -141,6 +153,8 @@ u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, req->ret = TEEC_ERROR_COMMUNICATION; break; } + if (res == 0) + req->ret = TEE_ERROR_TIMEOUT; } ret = req->ret; -- 2.43.0

2 months

3
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Registering dynamic shared memory

by Patryk

Hi, I have some problems configuring dynamic shared memory on my platform, and thought that perhaps somebody could give me a hint. My SoC (LS1028A, board: LS1028A-RDB), according to reference manual has two DRAM regions: - DRAM region 0 : start address: 0x80000000, size: 0x80000000 - DRAM region 2: start address: 0x2080000000, size: 0x1F80000000 I tried two approaches: 1) In optee-os, in a part of code that handles my SoC I added a call to register DDR only for the first region: register_addr(0x80000000, 2G - some size for TZ DRAM) (similarly like in case of other SoCs) However when the system boots up, the optee driver logs the following information: [ 5.703831] optee: dynamic shared memory is enabled E/TC:0 0 std_entry_with_parg:234 Bad arg address 0x208100e000 It seems that there is some problem with an address that the driver wants to use 2) Apart from registering first region I also added a call that registers the second region so I ended up with two calls: register_addr(0x80000000, 2G - some size for TZ DRAM) register_ddr(0x2080000000, 0x1F80000000); Now the problem is different since the platform no longer boots, due to the panic with the following output: D/TC:0 0 discover_nsec_memory:1117 No non-secure memory found in external DT D/TC:0 0 carve_out_phys_mem:362 No need to carve out 0xfc000000 size 0x3e00000 D/TC:0 0 carve_out_phys_mem:362 No need to carve out 0xffe00000 size 0x200000 E/TC:0 0 Panic at /usr/src/debug/optee-os-qoriq/4.2.0+git/core/mm/core_mmu.c:490 <core_mmu_set_discovered_nsec_ddr> I'm wondering, what am I missing? Do I need to register both regions? If so, why does the optee panic when the second region gets registered? I would be grateful for some ideas. Best regards Patryk

2 months, 1 week

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Linaro OP-TEE Contribution, LOC, monthly meeting January 28

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/ The TA-specific parts of fTPM have now been included in the first OP-TEE release in the optee_ftpm and we run fTPM in the OP-TEE OS CI loop at Github. Much of what we set out to do over half a year ago has been done, but there are some issues with the quality of the code. It doesn't compile without warnings and the coding style is inconsistent with the normal OP-TEE coding style (or anything else). Let's discuss how we can improve the status. Are there any other topics? Thanks, Jens

2 months, 1 week

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libtomcrypt, AES-CTR: Missing counter-increment for non-crypto-accelerated archs?

by Jork Loeser (he/him)

(Please provide a better way of reporting should this ML not be a good forum for bug-reports/fixes) Hello all, While experimenting with OP-TEE OS on a non-ARM platform (x86, to be precise), I noticed xtest regression_4003 and regression_4017 to be failing. It appears that for AES-CTR encrypt/decrypt, optee_os/core/lib/libtomcrypt/src/modes/ctr/ctr_encrypt.c:s_ctr_encrypt()<https://github.com/OP-TEE/optee_os/blob/37de1791d97d0df56db0709b5d001f82159…> fails to increment the counter on block boundaries when passed data covers a whole block. I suppose that it is a non-problem for architectures having crypto acceleration hooked up, since ctr_encrypt() bypasses s_ctr_encrypt() in that case. The below fixes the behavior for my setup - xtest regression_4003 and regression_4017 pass as a result: diff --git a/core/lib/libtomcrypt/src/modes/ctr/ctr_encrypt.c b/core/lib/libtomcrypt/src/modes/ctr/ctr_encrypt.c index a23e33c05..2019de2b6 100644 --- a/core/lib/libtomcrypt/src/modes/ctr/ctr_encrypt.c +++ b/core/lib/libtomcrypt/src/modes/ctr/ctr_encrypt.c @@ -61,6 +61,7 @@ static int s_ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned lo ct += ctr->blocklen; len -= ctr->blocklen; ctr->padlen = ctr->blocklen; + s_ctr_increment_counter(ctr); continue; } #endif I understand that you might prefer a full PR instead. Please accept my apologies for not providing such at this time; perhaps one of the maintainers (Jerome Forissier?) can take the above into consideration instead. If in doubt, consider above change as BSD-2-Clause'd. Best, Jork Loeser, Microsoft

2 months, 1 week

2
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OP-TEE 4.5.0 has been released

by Joakim Bech

Hi, I'm pleased to announce that I've just completed the release work and made OP-TEE version 4.5.0 available. The list of changes can be found in the changelog [1]. A summary of this release will be published shortly. The stable branch is available here [2] and the tested platforms for this release are listed here [3]. Many thanks to everyone who has contributed in any form to this release. [1] https://github.com/OP-TEE/optee_os/blob/master/CHANGELOG.md [2] https://github.com/OP-TEE/manifest/tree/4.5.0 [3] https://github.com/OP-TEE/optee_os/commit/0919de0f7c79ad35ad3c8ace5f823ad13… -- Regards, Joakim Bech | Distinguished Engineer | Linaro | | Mobile: +46 73 697 37 14 | Address: Scheelevägen 17, 223 63 Lund, Sweden |

2 months, 2 weeks

1
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Preparing for OP-TEE 4.5.0

by Joakim Bech

[BCC all OP-TEE maintainers] Hi OP-TEE maintainers & contributors, OP-TEE v4.5.0 is scheduled to be released on 2025-01-17. So, now is a good time to start testing the master branch on the various platforms and report/fix any bugs. The GitHub pull request for collecting Tested-by tags or any other comments is https://github.com/OP-TEE/optee_os/pull/7211. As usual, we will create a release candidate tag one week before the release date for final testing (Friday this week, i.e., tomorrow). In addition to that you can find some additional information related to releases here: https://optee.readthedocs.io/en/latest/general/releases.html -- Regards, Joakim Bech | Distinguished Engineer | Linaro | | Mobile: +46 73 697 37 14 | Address: Scheelevägen 17, 223 63 Lund, Sweden |

2 months, 4 weeks

1
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[GIT PULL] OP-TEE fix for v6.14

by Jens Wiklander

Hello arm-soc maintainers, Please pull this small patch fixing a version print in the optee driver. Thanks, Jens The following changes since commit fac04efc5c793dccbd07e2d59af9f90b7fc0dca4: Linux 6.13-rc2 (2024-12-08 14:03:39 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git/ tags/optee-for-v6.14 for you to fetch changes up to 1ff7d092dce0b2273dce4b8d33fa5856679dd25b: optee: fix format string for printing optee build_id (2024-12-17 11:22:46 +0100) ---------------------------------------------------------------- Fix format string for printing optee build_id ---------------------------------------------------------------- Sahil Malhotra (1): optee: fix format string for printing optee build_id drivers/tee/optee/smc_abi.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

3 months

1
0
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OP-TEE January 2025