Few storage technology such is EMMC, UFS, and NVMe support RPMB hardware partition with common protocol and frame layout. The RPMB partition cannot be accessed via standard block layer, but by a set of specific commands: WRITE, READ, GET_WRITE_COUNTER, and PROGRAM_KEY. Such a partition provides authenticated and replay protected access, hence suitable as a secure storage. A storage device registers its RPMB hardware (emmc) partition or RPMB W-LUN (ufs) with the RPMB layer providing an implementation for send_rpmb_req() handler. There is as well simulation platform device. This is handy as an RPMB key can be programmed only once at storage device lifetime. The RPMB layer aims to provide in-kernel API for Trusted Execution Environment (TEE) devices that are capable to securely compute block frame signature. In case a TEE device wish to store a replay protected data, it creates an RPMB frame with requested data and computes HMAC of the frame, then it requests the storage device via RPMB layer to store the data. A TEE driver can claim rpmb interface, for example, via class_interface_register (). A parallel user space API is provided via /dev/rpmbX character device with a single IOCTL command similar to the one provided by mmc/ioctl. h This API may help applications such as https://android.googlesource.com/trusty/app/storage/ To be obliviose to the underlaying HW storage technology. There is a sample tool under tools/rpmb/ directory that exercises this interface. Tomas Winkler (8): rpmb: add Replay Protected Memory Block (RPMB) subsystem char: rpmb: add sysfs-class ABI documentation char: rpmb: add device attributes char: rpmb: provide user space interface char: rpmb: add RPMB simulation device tools rpmb: add RPBM access tool mmc: block: register RPMB partition with the RPMB subsystem scsi: ufs: connect to RPMB subsystem Documentation/ABI/testing/sysfs-class-rpmb | 44 ++ Documentation/ioctl/ioctl-number.txt | 1 + MAINTAINERS | 10 + drivers/char/Kconfig | 2 + drivers/char/Makefile | 1 + drivers/char/rpmb/Kconfig | 25 + drivers/char/rpmb/Makefile | 6 + drivers/char/rpmb/cdev.c | 207 +++++++ drivers/char/rpmb/core.c | 408 ++++++++++++++ drivers/char/rpmb/rpmb-cdev.h | 31 ++ drivers/char/rpmb/rpmb_sim.c | 589 ++++++++++++++++++++ drivers/mmc/card/Kconfig | 1 + drivers/mmc/card/block.c | 292 ++++++++++ drivers/scsi/ufs/Kconfig | 1 + drivers/scsi/ufs/ufshcd.c | 219 ++++++++ drivers/scsi/ufs/ufshcd.h | 2 + include/linux/rpmb.h | 138 +++++ include/uapi/linux/rpmb.h | 120 ++++ tools/Makefile | 14 +- tools/rpmb/.gitignore | 2 + tools/rpmb/Makefile | 32 ++ tools/rpmb/rpmb.c | 862 +++++++++++++++++++++++++++++ 22 files changed, 3002 insertions(+), 5 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-rpmb create mode 100644 drivers/char/rpmb/Kconfig create mode 100644 drivers/char/rpmb/Makefile create mode 100644 drivers/char/rpmb/cdev.c create mode 100644 drivers/char/rpmb/core.c create mode 100644 drivers/char/rpmb/rpmb-cdev.h create mode 100644 drivers/char/rpmb/rpmb_sim.c create mode 100644 include/linux/rpmb.h create mode 100644 include/uapi/linux/rpmb.h create mode 100644 tools/rpmb/.gitignore create mode 100644 tools/rpmb/Makefile create mode 100644 tools/rpmb/rpmb.c -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
