From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carlos Aguiar Subject: [patch 3/6] Add MMC password protection (lock/unlock) support V4 Date: Tue, 31 Jan 2006 16:16:39 -0400 Message-ID: <20060131202543.501914000@localhost.localdomain> References: <20060131201636.264543000@localhost.localdomain> Return-path: Content-Disposition: inline; filename=mmc_key_retention.diff List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-omap-open-source-bounces@linux.omap.com Errors-To: linux-omap-open-source-bounces@linux.omap.com To: linux-kernel@vger.kernel.org, "Linux-omap-open-source@linux.omap.com" Cc: Russell King , linux@arm.linux.org.uk, "Lizardo Anderson (EXT-INdT/Manaus)" List-Id: linux-omap@vger.kernel.org Implement key retention operations. Signed-off-by: Anderson Briglia Signed-off-by: Anderson Lizardo Signed-off-by: Carlos Eduardo Aguiar Index: linux-omap-2.6.git/drivers/mmc/Kconfig =================================================================== --- linux-omap-2.6.git.orig/drivers/mmc/Kconfig 2006-01-31 15:17:45.000000000 -0400 +++ linux-omap-2.6.git/drivers/mmc/Kconfig 2006-01-31 15:22:25.000000000 -0400 @@ -19,6 +19,19 @@ config MMC_DEBUG This is an option for use by developers; most people should say N here. This enables MMC core and driver debugging. +config MMC_PASSWORDS + boolean "MMC card lock/unlock passwords (EXPERIMENTAL)" + depends on MMC && EXPERIMENTAL + select KEYS + help + Say Y here to enable the use of passwords to lock and unlock + MMC cards. This uses the access key retention support, using + request_key to look up the key associated with each card. + + For example, if you have an MMC card that was locked using + Symbian OS on your cell phone, you won't be able to read it + on Linux without this support. + config MMC_BLOCK tristate "MMC block device driver" depends on MMC Index: linux-omap-2.6.git/drivers/mmc/mmc.h =================================================================== --- linux-omap-2.6.git.orig/drivers/mmc/mmc.h 2006-01-31 15:17:45.000000000 -0400 +++ linux-omap-2.6.git/drivers/mmc/mmc.h 2006-01-31 15:22:25.000000000 -0400 @@ -18,4 +18,12 @@ struct mmc_host *mmc_alloc_host_sysfs(in int mmc_add_host_sysfs(struct mmc_host *host); void mmc_remove_host_sysfs(struct mmc_host *host); void mmc_free_host_sysfs(struct mmc_host *host); + +/* core-internal data */ +extern struct key_type mmc_key_type; +struct mmc_key_payload { + struct rcu_head rcu; /* RCU destructor */ + unsigned short datalen; /* length of this data */ + char data[0]; /* actual data */ +}; #endif Index: linux-omap-2.6.git/drivers/mmc/mmc_sysfs.c =================================================================== --- linux-omap-2.6.git.orig/drivers/mmc/mmc_sysfs.c 2006-01-31 15:22:07.000000000 -0400 +++ linux-omap-2.6.git/drivers/mmc/mmc_sysfs.c 2006-01-31 15:22:25.000000000 -0400 @@ -2,6 +2,8 @@ * linux/drivers/mmc/mmc_sysfs.c * * Copyright (C) 2003 Russell King, All Rights Reserved. + * MMC password protection (C) 2005 Instituto Nokia de Tecnologia (INdT), + * All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -13,6 +15,7 @@ #include #include #include +#include #include #include @@ -265,6 +268,71 @@ static struct class mmc_host_class = { static DEFINE_IDR(mmc_host_idr); static DEFINE_SPINLOCK(mmc_host_lock); +#ifdef CONFIG_MMC_PASSWORDS + +#define MMC_KEYLEN_MAXBYTES 32 + +int mmc_key_instantiate(struct key *key, const void *data, size_t datalen) +{ + struct mmc_key_payload *mpayload, *zap; + int ret; + + zap = NULL; + ret = -EINVAL; + if (datalen <= 0 || datalen > MMC_KEYLEN_MAXBYTES || !data) { + DBG("Invalid data\n"); + goto error; + } + + ret = key_payload_reserve(key, datalen); + if (ret < 0) { + DBG("ret = %d\n", ret); + goto error; + } + + ret = -ENOMEM; + mpayload = kmalloc(sizeof(*mpayload) + datalen, GFP_KERNEL); + if (!mpayload) { + DBG("Unable to allocate mpayload structure\n"); + goto error; + } + mpayload->datalen = datalen; + memcpy(mpayload->data, data, datalen); + + rcu_assign_pointer(key->payload.data, mpayload); + + /* ret = 0 if there is no error */ + ret = 0; + +error: + return ret; +} + +int mmc_key_match(const struct key *key, const void *description) +{ + return strcmp(key->description, description) == 0; +} + +/* + * dispose of the data dangling from the corpse of a mmc key + */ +void mmc_key_destroy(struct key *key) +{ + struct mmc_key_payload *mpayload = key->payload.data; + + kfree(mpayload); +} + +struct key_type mmc_key_type = { + .name = "mmc", + .def_datalen = MMC_KEYLEN_MAXBYTES, + .instantiate = mmc_key_instantiate, + .match = mmc_key_match, + .destroy = mmc_key_destroy, +}; + +#endif + /* * Internal function. Allocate a new MMC host. */ @@ -335,6 +403,15 @@ static int __init mmc_init(void) ret = class_register(&mmc_host_class); if (ret) bus_unregister(&mmc_bus_type); +#ifdef CONFIG_MMC_PASSWORDS + else { + ret = register_key_type(&mmc_key_type); + if (ret) { + class_unregister(&mmc_host_class); + bus_unregister(&mmc_bus_type); + } + } +#endif } return ret; } @@ -343,6 +420,9 @@ static void __exit mmc_exit(void) { class_unregister(&mmc_host_class); bus_unregister(&mmc_bus_type); +#ifdef CONFIG_MMC_PASSWORDS + unregister_key_type(&mmc_key_type); +#endif } module_init(mmc_init); --