- OP-TEE - lists.trustedfirmware.org

by Jan Claußen

I have recently commited some changes to the OP-TEE docs regarding the offline signing of TAs. I have now revisited my work after the holidays and the signing process is now failing with ERROR:sign_encrypt.py:Verification failed, ignoring given signature. although I am sure not to have changed anything. There is no TA being producd anymore. I am currently not sure if I made a mistake and did not see this, although I think I should have realized that no TAs are produced successfully. I am currently a bit pressed for time and was hoping that someone could assist me with the signing process. In the previous version there was a header prepended to the file that is to be signed echo "0000: 3031300D 06096086 48016503 04020105 000420" | \ xxd -c 19 -r > /tmp/sighdr cat /tmp/sighdr $(base64 --decode digestfile) > /tmp/hashtosign This script did not work and I omitted it. Can someone tell me why this was needed in the first place or how I could fix this step? I tried fixing the step as follows echo "0000: 3031300D 06096086 48016503 04020105 000420" | \ xxd -c 19 -r > /tmp/sighdr base64 --decode digestfile > /tmp/digestfile cat /tmp/sighdr /tmp/digestfile > /tmp/hashtosign but the pkcs11-tool then complains that the signature is too long. Any help appreciated! --- Jan

2 years

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Preparing for OP-TEE 4.1.0

by Jens Wiklander

[BCC all OP-TEE maintainers] Hi OP-TEE maintainers & contributors, OP-TEE v4.1.0 is scheduled to be released on 2024-01-19. 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/6574. As usual, we will create a release candidate tag one week before the release date for final testing. In addition to that you can find some additional information related to releases here: https://optee.readthedocs.io/en/latest/general/releases.html Thanks, Jens

2 years

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Secure interrupt while sending direct response

by Jens Wiklander

Hi all, I'm testing FF-A notifications with OP-TEE and Hafnium. I'm using interrupts from the secure uart as a trigger to set a notification for the normal world. Sometimes when testing I run into: VERBOSE: Secure virtual interrupt not yet serviced by SP 8001. FFA_MSG_SEND_DIRECT_RESP interrupted Hafnium then returns an FFA_ERROR (code -5) as a response to the FFA_MSG_SEND_DIRECT_RESP OP-TEE was just exiting with. After some digging in the code I find a comment at the top of plat_ffa_is_direct_response_interrupted() https://git.trustedfirmware.org/hafnium/hafnium.git/tree/src/arch/aarch64/p… /* * A secure interrupt might trigger while the target SP is currently * running to send a direct response. SPMC would then inject virtual * interrupt to vCPU of target SP and resume it. * However, it is possible that the S-EL1 SP could have its interrupts * masked and hence might not handle the virtual interrupt before * sending direct response message. In such a scenario, SPMC must * return an error with code FFA_INTERRUPTED to inform the S-EL1 SP of * a pending interrupt and allow it to be handled before sending the * direct response. */ The specification doesn't mention this as a valid error code for FFA_MSG_SEND_DIRECT_RESP. Is this something we can expect to be added to the specification or at least something OP-TEE has to be prepared to handle regardless? As far as I can tell there's no way of guaranteeing that Hafnium will not return this error for FFA_MSG_SEND_DIRECT_RESP. Even if we were able to execute the smc instruction with secure interrupts unmasked, what if the interrupt is raised just after the smc instruction has been trapped in Hafnium? It is a bit inconvenient as it means saving the registers passed to the smc instruction to be able to restart the smc instruction with the same arguments. It seems we may need to redesign the exit procedure. It would be nice with an example of how an S-EL1 SP is supposed to exit with FFA_MSG_SEND_DIRECT_RESP. Thoughts? Thanks, Jens

2 years, 1 month

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[GIT PULL] Improved TEE shared buffer support for v6.8

by Jens Wiklander

Hello arm-soc maintainers, Please pull this patch to add vmalloc support for shared buffer registration with the secure world. Thanks, Jens The following changes since commit b85ea95d086471afb4ad062012a4d73cd328fa86: Linux 6.7-rc1 (2023-11-12 16:19:07 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/tee-iov-iter-for-v6.8 for you to fetch changes up to 7bdee41575919773818e525ea19e54eb817770af: tee: Use iov_iter to better support shared buffer registration (2023-12-13 07:23:22 +0100) ---------------------------------------------------------------- TEE: improve shared buffer registration compatibility ---------------------------------------------------------------- Arnaud Pouliquen (1): tee: Use iov_iter to better support shared buffer registration drivers/tee/tee_shm.c | 78 +++++++++++++++++++++++++++------------------------ 1 file changed, 42 insertions(+), 36 deletions(-)

2 years, 1 month

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[GIT PULL] OP-TEE cleanup for v6.8

by Jens Wiklander

Hello arm-soc maintainers, Please pull these two small patches for the OP-TEE driver that remove a redundant custom workqueue and add a description of an argument of a optee_handle_rpc(). Note that this pull request is made on top of optee-supplicant-fix-for-v6.7 7269cba53d90 ("tee: optee: Fix supplicant based device enumeration") which was merged into v6.7-rc5, but in turn was based on top of v6.6. I did it like this because the Tested-bys where provided in this context. Thanks, Jens The following changes since commit 7269cba53d906cf257c139d3b3a53ad272176bca: tee: optee: Fix supplicant based device enumeration (2023-11-03 09:27:20 +0100) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/optee-cleanup-for-v6.8 for you to fetch changes up to b19773a1c6c02f5efc35e9f506aeddd2c7d2ac29: optee: add missing description of RPC argument reference (2023-12-11 15:02:12 +0100) ---------------------------------------------------------------- OP-TEE cleanup - Remove a redundant custom workqueue in the OP-TEE driver. - Fix a missing description of an argument to optee_handle_rpc(). ---------------------------------------------------------------- Etienne Carriere (1): optee: add missing description of RPC argument reference Sumit Garg (1): tee: optee: Remove redundant custom workqueue drivers/tee/optee/core.c | 13 ++----------- drivers/tee/optee/optee_private.h | 2 -- drivers/tee/optee/smc_abi.c | 1 + 3 files changed, 3 insertions(+), 13 deletions(-)

2 years, 1 month

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[PATCH v5] tee: Use iov_iter to better support shared buffer registration

by Arnaud Pouliquen

Currently it's not possible to register kernel buffers with TEE which are allocated via vmalloc. Use iov_iter and associated helper functions to manage the page registration for all type of memories. Suggested-by: Christoph Hellwig <hch(a)infradead.org> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen(a)foss.st.com> --- Update from V4 to V5: - replace import_ubuf() by iov_iter_ubuf(), - fix comment in register_shm_helper() function. Update from V3 to V4: - improve commit message, - use import_ubuf() instead of iov_iter_init(), - move shm_get_kernel_pages in register_shm_helper, - put back untagged_addr in register_shm_helper(), - move the comment related to pin pages from shm_get_kernel_pages() to register_shm_helper(). Update from V2 to V3: - break lines longer than 80 columns. Update from V1 to V2: - replace ITER_SOURCE by ITER_DEST flag in tee_shm_register_user_buf(), - replace IS_ERR_OR NULL(shm) by IS_ERR(shm) in tee_shm_register_user_buf(). V1: The support of buffer registration allocated with vmalloc is no more available since c83900393aa1 ("tee: Remove vmalloc page support"). This patch is an alternative to a revert and resulted from a discussion with Christopher Hellwig [1]. This patch has been tested using xtest tool in optee qemu environment [2] and using the series related to the remoteproc tee that should be proposed soon [3]. References: [1] https://lore.kernel.org/linux-arm-kernel/18a8528d-7d9d-6ed0-0045-5ee47dd39f… [2] https://optee.readthedocs.io/en/latest/building/devices/qemu.html#build-ins… [3] https://lore.kernel.org/linux-arm-kernel/18a8528d-7d9d-6ed0-0045-5ee47dd39f… --- drivers/tee/tee_shm.c | 78 +++++++++++++++++++++++-------------------- 1 file changed, 42 insertions(+), 36 deletions(-) diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 673cf0359494..731d9028b67f 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -22,23 +22,12 @@ static void shm_put_kernel_pages(struct page **pages, size_t page_count) put_page(pages[n]); } -static int shm_get_kernel_pages(unsigned long start, size_t page_count, - struct page **pages) +static void shm_get_kernel_pages(struct page **pages, size_t page_count) { - struct page *page; size_t n; - if (WARN_ON_ONCE(is_vmalloc_addr((void *)start) || - is_kmap_addr((void *)start))) - return -EINVAL; - - page = virt_to_page((void *)start); - for (n = 0; n < page_count; n++) { - pages[n] = page + n; + for (n = 0; n < page_count; n++) get_page(pages[n]); - } - - return page_count; } static void release_registered_pages(struct tee_shm *shm) @@ -214,13 +203,14 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size) EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); static struct tee_shm * -register_shm_helper(struct tee_context *ctx, unsigned long addr, - size_t length, u32 flags, int id) +register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags, + int id) { struct tee_device *teedev = ctx->teedev; struct tee_shm *shm; - unsigned long start; - size_t num_pages; + unsigned long start, addr; + size_t num_pages, off; + ssize_t len; void *ret; int rc; @@ -245,31 +235,38 @@ register_shm_helper(struct tee_context *ctx, unsigned long addr, shm->flags = flags; shm->ctx = ctx; shm->id = id; - addr = untagged_addr(addr); + addr = untagged_addr((unsigned long)iter_iov_addr(iter)); start = rounddown(addr, PAGE_SIZE); - shm->offset = addr - start; - shm->size = length; - num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE; + num_pages = iov_iter_npages(iter, INT_MAX); + if (!num_pages) { + ret = ERR_PTR(-ENOMEM); + goto err_ctx_put; + } + shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); if (!shm->pages) { ret = ERR_PTR(-ENOMEM); goto err_free_shm; } - if (flags & TEE_SHM_USER_MAPPED) - rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE, - shm->pages); - else - rc = shm_get_kernel_pages(start, num_pages, shm->pages); - if (rc > 0) - shm->num_pages = rc; - if (rc != num_pages) { - if (rc >= 0) - rc = -ENOMEM; - ret = ERR_PTR(rc); - goto err_put_shm_pages; + len = iov_iter_extract_pages(iter, &shm->pages, LONG_MAX, num_pages, 0, + &off); + if (unlikely(len <= 0)) { + ret = len ? ERR_PTR(len) : ERR_PTR(-ENOMEM); + goto err_free_shm_pages; } + /* + * iov_iter_extract_kvec_pages does not get reference on the pages, + * get a reference on them. + */ + if (iov_iter_is_kvec(iter)) + shm_get_kernel_pages(shm->pages, num_pages); + + shm->offset = off; + shm->size = len; + shm->num_pages = num_pages; + rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, shm->num_pages, start); if (rc) { @@ -279,10 +276,11 @@ register_shm_helper(struct tee_context *ctx, unsigned long addr, return shm; err_put_shm_pages: - if (flags & TEE_SHM_USER_MAPPED) + if (!iov_iter_is_kvec(iter)) unpin_user_pages(shm->pages, shm->num_pages); else shm_put_kernel_pages(shm->pages, shm->num_pages); +err_free_shm_pages: kfree(shm->pages); err_free_shm: kfree(shm); @@ -307,6 +305,7 @@ struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, u32 flags = TEE_SHM_USER_MAPPED | TEE_SHM_DYNAMIC; struct tee_device *teedev = ctx->teedev; struct tee_shm *shm; + struct iov_iter iter; void *ret; int id; @@ -319,7 +318,8 @@ struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx, if (id < 0) return ERR_PTR(id); - shm = register_shm_helper(ctx, addr, length, flags, id); + iov_iter_ubuf(&iter, ITER_DEST, (void __user *)addr, length); + shm = register_shm_helper(ctx, &iter, flags, id); if (IS_ERR(shm)) { mutex_lock(&teedev->mutex); idr_remove(&teedev->idr, id); @@ -352,8 +352,14 @@ struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx, void *addr, size_t length) { u32 flags = TEE_SHM_DYNAMIC; + struct kvec kvec; + struct iov_iter iter; + + kvec.iov_base = addr; + kvec.iov_len = length; + iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, length); - return register_shm_helper(ctx, (unsigned long)addr, length, flags, -1); + return register_shm_helper(ctx, &iter, flags, -1); } EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf); -- 2.25.1

2 years, 1 month

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[PATCH v9 0/6] introduce tee-based EFI Runtime Variable Service

by Masahisa Kojima

This series introduces the tee based EFI Runtime Variable Service. The eMMC device is typically owned by the non-secure world(linux in this case). There is an existing solution utilizing eMMC RPMB partition for EFI Variables, it is implemented by interacting with OP-TEE, StandaloneMM(as EFI Variable Service Pseudo TA), eMMC driver and tee-supplicant. The last piece is the tee-based variable access driver to interact with OP-TEE and StandaloneMM. Changelog: v8 -> v9 - patch #6 "tee: optee: restore efivars ops when tee-supplicant stops" is newly added - remove !EFI_VARS_PSTORE Kconfig dependency, we have added a non-blocking set_variable and it just returns EFI_UNSUPPORTED. - remove obvious comments v7 -> v8 Only patch #3 "efi: Add tee-based EFI variable driver" is updated. - fix typos - refactor error handling, direct return if applicable - use devm_add_action_or_reset() for closing of tee context/session - remove obvious comment v6 -> v7 Patch #1-#4 are not updated. Patch #5 is added into this series, original patch is here: https://lore.kernel.org/all/20230609094532.562934-1-ilias.apalodimas@linaro… There are two issues in the v6 series and v7 series addresses those. 1) efivar ops is not restored when the tee-supplicant daemon terminates. -> As the following patch says, user must remove the device before terminating tee-supplicant daemon. https://lore.kernel.org/all/20230728134832.326467-1-sumit.garg@linaro.org/ 2) cause panic when someone remounts the efivarfs as RW even if SetVariable is not supported -> The fifth patch addresses this issue. "[PATCH v7 5/5] efivarfs: force RO when remounting if SetVariable is not supported" v5 -> v6 - new patch #4 is added in this series, #1-#3 patches are unchanged. automatically update super block flag when the efivarops support SetVariable runtime service, so that user does not need to manually remount the efivarfs as RW. v4 -> v5 - rebase to efi-next based on v6.4-rc1 - set generic_ops.query_variable_info, it works as expected as follows. $ df -h /sys/firmware/efi/efivars/ Filesystem Size Used Avail Use% Mounted on efivarfs 16K 1.3K 15K 8% /sys/firmware/efi/efivars v3 -> v4: - replace the reference from EDK2 to PI Specification - remove EDK2 source code reference comments - prepare nonblocking variant of set_variable, it just returns EFI_UNSUPPORTED - remove redundant buffer size check - argument name change in mm_communicate - function interface changes in setup_mm_hdr to remove (void **) cast v2 -> v3: - add CONFIG_EFI dependency to TEE_STMM_EFI - add missing return code check for tee_client_invoke_func() - directly call efivars_register/unregister from tee_stmm_efi.c rfc v1 -> v2: - split patch into three patches, one for drivers/tee, one for include/linux/efi.h, and one for the driver/firmware/efi/stmm - context/session management into probe() and remove() same as other tee client driver - StMM variable driver is moved from driver/tee/optee to driver/firmware/efi - use "tee" prefix instead of "optee" in driver/firmware/efi/stmm/tee_stmm_efi.c, this file does not contain op-tee specific code, abstracted by tee layer and StMM variable driver will work on other tee implementation. - PTA_STMM_CMD_COMMUNICATE -> PTA_STMM_CMD_COMMUNICATE - implement query_variable_store() but currently not used - no use of TEEC_SUCCESS, it is defined in driver/tee/optee/optee_private.h. Other tee client drivers use 0 instead of using TEEC_SUCCESS - remove TEEC_ERROR_EXCESS_DATA status, it is referred just to output error message Ilias Apalodimas (1): efivarfs: force RO when remounting if SetVariable is not supported Masahisa Kojima (5): efi: expose efivar generic ops register function efi: Add EFI_ACCESS_DENIED status code efi: Add tee-based EFI variable driver efivarfs: automatically update super block flag tee: optee: restore efivars ops when tee-supplicant stops drivers/firmware/efi/Kconfig | 15 + drivers/firmware/efi/Makefile | 1 + drivers/firmware/efi/efi.c | 18 + drivers/firmware/efi/stmm/mm_communication.h | 236 +++++++ drivers/firmware/efi/stmm/tee_stmm_efi.c | 617 +++++++++++++++++++ drivers/firmware/efi/vars.c | 8 + drivers/tee/optee/supp.c | 4 + fs/efivarfs/super.c | 45 ++ include/linux/efi.h | 13 + 9 files changed, 957 insertions(+) create mode 100644 drivers/firmware/efi/stmm/mm_communication.h create mode 100644 drivers/firmware/efi/stmm/tee_stmm_efi.c base-commit: b691118f2c44d16b84fc65b8147b33620eb18cac -- 2.30.2

2 years, 1 month

4
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[GIT PULL] OP-TEE kernel private shared memory optimizations for 6.8

by Jens Wiklander

Hello arm-soc maintainers, Please pull these two patches that optmize how the OP-TEE driver private shared memory allocated as dynamic shared memory. Thanks, Jens The following changes since commit b85ea95d086471afb4ad062012a4d73cd328fa86: Linux 6.7-rc1 (2023-11-12 16:19:07 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/kern-priv-shm-for-v6.8 for you to fetch changes up to 225a36b96359aceaa9a6399f2dff99627397e637: optee: allocate shared memory with alloc_pages_exact() (2023-12-04 14:48:42 +0100) ---------------------------------------------------------------- OP-TEE kernel private shared memory optimizations Optimize OP-TEE driver private shared memory allocated as dynamic shared memory. Both to handle larger than one page allocations and for more efficient memory usage. ---------------------------------------------------------------- Jens Wiklander (2): optee: add page list to kernel private shared memory optee: allocate shared memory with alloc_pages_exact() drivers/tee/optee/core.c | 44 +++++++++++++++++++++++--------------------- drivers/tee/optee/smc_abi.c | 45 +++++++++++++++++++++------------------------ 2 files changed, 44 insertions(+), 45 deletions(-)

2 years, 1 month

1
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[GIT PULL] OP-TEE FF-A asynchronous notifications for 6.8

by Jens Wiklander

Hello arm-soc maintainers, Please pull these patches that enables asynchronous notifications in OP-TEE FF-A driver. This pull request is on top of the "system_thread_for_v6.8" pull request to avoid a merge conflict. Thanks, Jens The following changes since commit 4b391c9c37646f25118355f414b9e6d9fefe782f: firmware: arm_scmi: optee: use optee system invocation (2023-11-17 15:48:03 +0100) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/ffa-notif-for-v6.8 for you to fetch changes up to d0476a59de064205f4aaa8f7c6d6f32bc28a44d4: optee: ffa_abi: add asynchronous notifications (2023-11-17 15:55:41 +0100) ---------------------------------------------------------------- OP-TEE: asynchronous notifications with FF-A Add support for asynchronous notifications in the OP-TEE FF-A driver. This is the FF-A counterpart to the asynchronous notifications already available in the OP-TEE SMC ABI. ---------------------------------------------------------------- Jens Wiklander (2): optee: provide optee_do_bottom_half() as a common function optee: ffa_abi: add asynchronous notifications drivers/tee/optee/call.c | 31 ++++++++++++- drivers/tee/optee/ffa_abi.c | 93 +++++++++++++++++++++++++++++++++++++-- drivers/tee/optee/optee_ffa.h | 28 ++++++++++-- drivers/tee/optee/optee_private.h | 9 +++- drivers/tee/optee/smc_abi.c | 36 ++------------- 5 files changed, 155 insertions(+), 42 deletions(-)

2 years, 1 month

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[GIT PULL] OP-TEE reserved system thread for 6.8

by Jens Wiklander

Hello arm-soc maintainers, Please pull these patches that enables SCMI with OP-TEE transport to to reserve a thread in the secure world to guarentee that requests will not have to wait for a thread to become available. Thanks, Jens The following changes since commit b85ea95d086471afb4ad062012a4d73cd328fa86: Linux 6.7-rc1 (2023-11-12 16:19:07 -0800) are available in the Git repository at: https://git.linaro.org/people/jens.wiklander/linux-tee.git tags/system-thread-for-v6.8 for you to fetch changes up to 4b391c9c37646f25118355f414b9e6d9fefe782f: firmware: arm_scmi: optee: use optee system invocation (2023-11-17 15:48:03 +0100) ---------------------------------------------------------------- OP-TEE add reserved system thread Add support for a reserved system thread in the SMC-ABI of the OP-TEE driver. SCMI with OP-TEE transport uses this to guarantee that it will always have a thread available in the secure world. ---------------------------------------------------------------- Etienne Carriere (4): tee: optee: system thread call property tee: system session tee: optee: support tracking system threads firmware: arm_scmi: optee: use optee system invocation drivers/firmware/arm_scmi/optee.c | 4 ++ drivers/tee/optee/call.c | 130 ++++++++++++++++++++++++++++++++++++-- drivers/tee/optee/core.c | 5 +- drivers/tee/optee/ffa_abi.c | 14 ++-- drivers/tee/optee/optee_private.h | 29 ++++++++- drivers/tee/optee/smc_abi.c | 32 +++++++--- drivers/tee/tee_core.c | 8 +++ include/linux/tee_drv.h | 16 +++++ 8 files changed, 211 insertions(+), 27 deletions(-)

2 years, 1 month

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