This set of patches adds support for password protected locking and unlocking of MMC and SD devices. It uses the LOCK/UNLOCK command (CMD42) available in both the MMC and SD command sets.
Some of this code was based on a patch set submitted in 2006 by Anderson Briglia "Add MMC Password Protection (lock/unlock)". This patch set never made it into mainline. By default, a card with no password assigned is always in "unlocked" state. After password assignment, in the next power cycle the card switches to a "locked" state where only the "basic" and "lock card" command classes are accepted by the card. Only after unlocking it with the correct password can the card be used for normal operations like block I/O. Password management and caching is done through the "Kernel Key Retention Service" mechanism and the sysfs filesystem. Two new sysfs attributes were added. The "lock" attribute is used to lock, unlock, assign a password, clear a password and force erase a card. The "unlock_retry" attribute is used to retry an unlock that failed during boot because the rootfs was not yet available with the password. Changed for V2: The V2 changes were not functional and were just general cleanup. - Use stub functions to reduce the number of CONFIG ifdefs. - Add static to a few functions that were local. - Use pr_warn instead of pr_warning. - Improve a few variable names and messages. Al Cooper (7): mmc: lock: Use the kernel "KEYS" subsystem to get a card's password mmc: lock: Add low level LOCK_UNLOCK command mmc: lock: Add function to unlock a password locked card mmc: lock: Add card lock/unlock maintenance commands mmc: lock: Change SD init functionality to handle locked SD cards mmc: lock: Prevent partition table read for locked cards. mmc: lock: Change MMC init to handle locked cards. drivers/mmc/card/block.c | 7 +++ drivers/mmc/core/Kconfig | 8 +++ drivers/mmc/core/core.c | 131 ++++++++++++++++++++++++++++++++++++++++++++ drivers/mmc/core/core.h | 15 ++++- drivers/mmc/core/mmc.c | 123 +++++++++++++++++++++++++++++++++++++++++ drivers/mmc/core/mmc_ops.c | 112 +++++++++++++++++++++++++++++++++++++ drivers/mmc/core/mmc_ops.h | 13 +++++ drivers/mmc/core/sd.c | 134 +++++++++++++++++++++++++++++++++------------ include/linux/mmc/card.h | 6 ++ 9 files changed, 512 insertions(+), 37 deletions(-) -- 1.8.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
