This is always on my todo list but it never bubbles to the top. In a few weeks I will probably be in a position to take another pass at getting this in. Al On Wed, Jul 6, 2016 at 9:15 PM, Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote: > Hi, > >> From: Al Cooper >> Sent: Wednesday, May 20, 2015 8:11 AM >> To: ulf.hansson@xxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx; pgynther@xxxxxxxxxx >> Cc: Al Cooper <alcooperx@xxxxxxxxx> >> Subject: [PATCH V3 0/8] Add password protected lock/unlock support for SD/MMC > > This patch set is quite old, but do you have any update for upstreaming of this patch set? > Our team would like to use this function on our platform. > So, if possible, we would like to apply this function on upstream. > > Best regards, > Yoshihiro Shimoda > >> 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. >> >> The user space software needed to test this new feature >> is available on GitHub at: >> https://github.com/alcooper/mmc-password-utils >> See the README for a detailed description of the user space layer >> and how to use this feature. >> >> Changed for V3: >> - Ported the V2 patch set submitted Aug. 2013 to the latest mainline >> (v4.1-rc4). >> - Created a GitHub project for the user space layer. >> - Change the lock command (CMD42) to round up the data buffer >> size to 512 for SD but leave exact size for eMMC based on the >> SD and eMMC specs. >> >> >> 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. >> >> >> Abbas Raza (1): >> According to SD Physical Layer Specifications: Locked cards respond to >> (and execute) all commands in the "basic" command class (class 0), >> ACMD41, CMD16 and "lock card" command class. Thus, the host is >> allowed to reset, initialize, select, query for status, etc., but >> not to access data on the card. >> >> 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 | 14 ++++ >> drivers/mmc/core/Kconfig | 8 +++ >> drivers/mmc/core/core.c | 120 +++++++++++++++++++++++++++++++++ >> drivers/mmc/core/core.h | 14 +++- >> drivers/mmc/core/mmc.c | 123 ++++++++++++++++++++++++++++++++++ >> drivers/mmc/core/mmc_ops.c | 150 +++++++++++++++++++++++++++++++++++++++++ >> drivers/mmc/core/mmc_ops.h | 13 ++++ >> drivers/mmc/core/sd.c | 161 +++++++++++++++++++++++++++++++-------------- >> include/linux/mmc/card.h | 6 ++ >> 9 files changed, 560 insertions(+), 49 deletions(-) >> >> -- >> 1.9.0.138.g2de3478 >> >> -- >> 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 -- 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
