- TF-M - lists.trustedfirmware.org

by Bohdan.Hunko＠infineon.com

Hi all, I have a few questions regarding an521 platform protection settings for Level 3 isolation. In platform/ext/target/arm/mps2/an521/tfm_hal_isolation.c there is an const static struct mpu_armv8m_region_cfg_t region_cfg[] - for L3 it specifies to protect: * Code (from Image$$PT_RO_START$$Base to Image$$PT_RO_END$$Base) to be accessible in both PRIV and UNPRIV states. * PSA RoT partitions data in RAM (from Image$$PT_PRIV_RWZI_START$$Base to Image$$PT_PRIV_RWZI_END$$Base)to be accessible only in UNPRIV state. * TFM_SP_META_PTR to be accessible in both PRIV and UNPRIV states. Also in this file mpu_armv8m_enable() function call specifies PRIVILEGED_DEFAULT_ENABLE for MPU. I have following question to this configuration * Does this configuration mean that in L3 PSA RoT code is not isolated from APP RoT (APP RoT can read/execute PSA RoT domain code)? * How SPM data (TFM_BSS and TFM_DATA sections from scatter file) is protected? I cant see it being protected by MPU. * Is it skipped because PRIVILEGED_DEFAULT_ENABLE is set which means that SPM will be able to access this data and this allows to save one MPU region? * If so then why MPU region is used for PSA RoT partitions data? Regards, Bohdan Hunko Cypress Semiconductor Ukraine Engineer CSUKR CSS ICW SW FW Mobile: +38099 50 19 714 Bohdan.Hunko(a)infineon.com<mailto:Bohdan.Hunko@infineon.com>

3 years, 2 months

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[RFC]Library Model deprecation

by Summer Qin

Hi, We plan to merge Library Model deprecation patches<https://review.trustedfirmware.org/q/topic:%22library-model-deprecation%22+…> this Friday since some other development work depends on this. May I ask for a review on these patches? Best Regards, Summer

3 years, 2 months

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Open CI Infrastructure in Maintenance

by Xinyu Zhang

Hi, Open CI infrastructure is in an emergency maintenance. Tests will be impacted. I'll let you know once it is back to normal. Best Regards, Xinyu

3 years, 2 months

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State of Extra tests

by Bohdan.Hunko＠infineon.com

Hi all, I have tried building Extra S and NS tests from tf-m-extras repo for PSoC64 and the result I got is that device prints message that extra S test started and reboots. Here is the command line I used: cmake -S . -B build_psoc64 -G "Unix Makefiles" -DTFM_PLATFORM=cypress/psoc64 -DTFM_LVL=2 -DEXTRA_S_TEST_SUITES_PATHS=< tf-m-extras path>/examples/extra_test_suites_example/extra_s -DEXTRA_NS_TEST_SUITES_PATHS=<tf-m-extras path>/examples/extra_test_suites_example/extra_ns I have also tries building with following command line (same as before but -DTEST_S=ON and -DTEST_NS=ON added): cmake -S . -B build_psoc64 -G "Unix Makefiles" -DTFM_PLATFORM=cypress/psoc64 -DTFM_LVL=2 -DEXTRA_S_TEST_SUITES_PATHS=< tf-m-extras path>/examples/extra_test_suites_example/extra_s -DEXTRA_NS_TEST_SUITES_PATHS=<tf-m-extras path>/examples/extra_test_suites_example/extra_ns -DTEST_S=ON -DTEST_NS=ON The result is the same - message about starting Extra S test suite is printed and then device reboots. Could someone please test it on other platform and let me know whether Extra S and NS tests works there. Regards, Bohdan Hunko Cypress Semiconductor Ukraine Engineer CSUKR CSS ICW SW FW Mobile: +38099 50 19 714 Bohdan.Hunko(a)infineon.com<mailto:Bohdan.Hunko@infineon.com>

3 years, 2 months

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Use original CMSIS files

by david.hazi＠arm.com

Hi all, We've created a change, which is using original CMSIS headers in TF-M. Current patch is only for arm/mps3/an552 platform. Our plan is to create a public review only for this (which will NOT be merged), and after the review, we would like to extend this patch to all of the platforms. The main changes in the chain: - copy and zero_table size fix in the GNU linker scripts and initial startup code - Removed __INITIAL_SP and __STACK_LIMIT patch form gcc and iar cmsis files, NS linker scripts using CMSIS style naming, the secure and bl2 build's linker scripts remains untouched (ARMCLANG style naming, __INITIAL_SP and __STACK_LIMIT patched with cmsis_stack_override interface library) - NS process stack removed from NS linkers (PSP) - Common startup file for bl2 and ns builds - Add original cmsis headers, updated system and startup files - Stack sealing done twice, once from startup (to resemble CMSIS startup template) and once from TF-M secure main Feedback is welcome: https://review.trustedfirmware.org/q/topic:%2522use-original-cmsis-headers%… David Hazi

3 years, 2 months

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TF-M psa crypto test do not set the algorithms in psa_key_attributes_t

by Swarowsky, Markus

Hello, I was adding sanity checks to the psa_crypto_driver_wrappers to validate bits/type and policy->alg of the given psa_key_attributes_t attributes for the psa_generate_key, psa_import_key, and psa_copy_key calls. To check it the given combination is within the psa specification. In the PSA crypto spec it says: The key permitted-algorithm policy is required for keys that will be used for a cryptographic operation, see Permitted algorithms<https://armmbed.github.io/mbed-crypto/html/api/keys/policy.html#permitted-a…>. [https://armmbed.github.io/mbed-crypto/html/api/keys/management.html?highlig…] Which is most likely the case for all key types except of PSA_KEY_TYPE_RAW_DATA But after adding the sanity checks the TF-M crypto tests(test_c*_testing_* and TFM_S/NS_CRYPTO_TEST_10*) failed. I took a look at these tests, it turned out that they don't set the algorithm flag for the key attributes. My question now is, is the algorithm flag skipped on purpose or just missed during the test case creation as It should be set according to the psa crypto spec? Thanks for the help and the feedback Markus Swarowsky | R & D Engineer M +47 404 66 922 | Trondheim, Norway nordicsemi.com<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.nordic…> | devzone.nordicsemi.com<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdevzone.n…> Facebook<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.faceb…> | LinkedIn<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linke…> | Twitter<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.c…> | YouTube<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtu…> | Instagram<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.insta…> [Nordic_logo_signature]<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.nordic…>

3 years, 2 months

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TF-M Open CI Unstable

by Xinyu Zhang

Hi, TF-M Open CI is unstable for the time being because of the ArmClang license issue in Jenkins. Sorry for any inconvenience! I'll let you know once it is back to normal. Thanks, Xinyu

3 years, 2 months

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[RFC]Moving faults handlers to dedicated file

by Kevin Peng

Dear platform owners, I'm moving faults handlers to dedicated files from spm_hal.c as this file should be for Library Model only. https://review.trustedfirmware.org/c/TF-M/trusted-firmware-m/+/16858 Please check your platforms respectively. Plan to merge it on next Monday. Best Regards, Kevin

3 years, 2 months

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Level 3 Isolation improvements

by Bohdan.Hunko＠infineon.com

Hi everyone, I have several questions related to L3 isolation in TFM. First of all, FFM specifies that: * In L3 PSA RoT partitions does not need to be isolated from SPM (and vice versa) * PSA RoT partitions does not need to be isolated from each other * PSA RoT partitions and SPM must be isolated from APP RoT partitions * APP RoT partitions must be isolated from each other This picture from TFM docs<https://tf-m-user-guide.trustedfirmware.org/docs/technical_references/desig…> seem to illustrate statements above. Currently platforms with L3 support (e.g. an521) follow the rules stated above. They achieve this by executing PSA RoT partitions and SPM in privileged mode, and APP RoT partitions in unprivileged mode. Partition boundaries are only updated when switching to APP RoT partition. From description of tfm_hal_activate_boundary (see code here<https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/secure_fw/…>) and this an521 code<https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/platform/e…> seems like platform can determine whether partition will be executed in privileged or unprivileged mode. So my questions are: 1. For improved isolation in L3 does it make sense to: * isolate SPM from PSA RoT partitions * isolate PSA RoT partitions from each other (like APP RoT partitions are isolated) 1. If question 1 make sense then can platform achieve this improved isolation with current code base? From this an521 code<https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/platform/e…> it seems like platform may set all partitions to be executed in unprivileged mode and dynamically switch boundaries between them (between both PSA and APP RoT partitions). SPM will remain in privileged mode. It seems like this approach is possible with minor changes to SPM. For example this code will need<https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/secure_fw/…> to be changed to call tfm_hal_activate_boundary regardless of partition privilege level. Are there any other changes needed to make this approach work? Regards, Bohdan Hunko Cypress Semiconductor Ukraine Engineer CSUKR CSS ICW SW FW Mobile: +38099 50 19 714 Bohdan.Hunko(a)infineon.com<mailto:Bohdan.Hunko@infineon.com>

3 years, 2 months

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Enable stack protection in the regression tests

by Swarowsky, Markus

Hey, While trying to debug a crash in the TF-M regression tests, I noticed that the msplim_ns register is set to 0x0, leaving the non-secure application without any stack to protection, sadly I wasn't able to figure out how to enable the stack protection, which would be nice as we suspect that a stack overflow could cause the crash. Therefore, I would be interested if it possible to enable stack protection for the non-secure application of the TF-M regression tests and if so, how? Thanks for the help Markus Swarowsky | R & D Engineer M +47 404 66 922 | Trondheim, Norway nordicsemi.com<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.nordic…> | devzone.nordicsemi.com<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdevzone.n…> Facebook<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.faceb…> | LinkedIn<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linke…> | Twitter<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftwitter.c…> | YouTube<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtu…> | Instagram<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.insta…> [Nordic_logo_signature]<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.nordic…>

3 years, 2 months

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