This patch series adds LUKS full disk encryption support using firmware TPM (fTPM) for TI K3 platforms. The implementation provides hardware-backed encryption with keys sealed by TPM running in OP-TEE and stored in eMMC RPMB.
Background: TI K3 platforms do not have integrated discrete TPM hardware. To provide TPM 2.0 functionality, this implementation uses firmware TPM (fTPM) - a Trusted Application running in OP-TEE secure world. The fTPM provides standard TPM 2.0 interfaces while leveraging ARM TrustZone for isolation and eMMC RPMB (Replay Protected Memory Block) for secure persistent storage. Key features: - Conditional builds: Enabled via DISTRO_FEATURES += "luks" with MACHINE_FEATURES as 'optee-ftpm' - No impact on default SDK builds - In-place encryption on first boot - TPM persistent handle for key storage (0x81080001) - Secure key storage in eMMC RPMB via OP-TEE - Security model similar to CIP Core Use case: This is designed for K3 platforms requiring secure boot and encrypted storage, such as industrial automation, automotive, and IoT gateways where discrete TPM chips are cost-prohibitive but security requirements demand hardware-backed encryption. Testing: - Tested on AM62x platform with kernel 6.18 - First boot: Successful in-place LUKS encryption - Subsequent boots: Successful TPM unsealing and boot The series is structured as follows: 1. Kernel configuration for LUKS and crypto support 2. LUKS encryption initramfs module with fTPM key management 3. Initramfs generation trigger and packagegroup with dual gating --- Changes in v5: - change from MACHINE_FEATURES 'luks-encryption' to DISTRO_FEATURES 'luks' - implement dual gating using existing MACHINE_FEATURES 'optee-ftpm' - optimize kernel config - remove unnecessary CBC, ECB, ESSIV, LRW, PCBC, SHA256_ARM64 - packagegroup-ti-core-initramfs.bb changes moved to patch 3 from patch2 - Link to v4: https://lore.kernel.org/all/[email protected]/ Changes in v4: - remove encrypted-boot-common.inc and use existing ti-core-initramfs.inc - Link to v3: https://lore.kernel.org/all/[email protected]/ Changes in v3: - remove separate sdimage.wks for encrypted boot, default works - update encrypted-boot-common.inc to use existing hook for adding TI_CORE_INITRAMFS_ENABLED dependency on luks-encryption flag - add logic to verify if partition has enough space for LUKS header before starting encryption Changes in v2: - changes to use existing ti-core-initramfs instead of adding separate - cleanup in previous init script as per comments in v1 - /usr/bin/busybox logs updated to echo, mesg, info - WORKDIR changed to UNPACKDIR - Link to v1: https://lore.kernel.org/all/[email protected]/ Shiva Tripathi (3): linux-ti-staging: Add LUKS encryption config initramfs: Add LUKS encryption module with fTPM ti-core-initramfs: Enable initramfs for LUKS encryption .../machine/include/ti-core-initramfs.inc | 2 +- .../linux/linux-ti-staging-6.18/luks-ftpm.cfg | 22 ++ .../linux/linux-ti-staging_6.18.bb | 9 + .../initramfs-module-luks-ftpm/luksftpm | 341 ++++++++++++++++++ .../initramfs-module-luks-ftpm_1.0.bb | 41 +++ .../packagegroup-ti-core-initramfs.bb | 3 + 6 files changed, 417 insertions(+), 1 deletion(-) create mode 100644 meta-ti-bsp/recipes-kernel/linux/linux-ti-staging-6.18/luks-ftpm.cfg create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-luks-ftpm/luksftpm create mode 100644 meta-ti-bsp/recipes-ti/initramfs/initramfs-module-luks-ftpm_1.0.bb -- 2.34.1
-=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#19669): https://lists.yoctoproject.org/g/meta-ti/message/19669 Mute This Topic: https://lists.yoctoproject.org/mt/118173650/21656 Group Owner: [email protected] Unsubscribe: https://lists.yoctoproject.org/g/meta-ti/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
