Add commands for locking and unlocking SD cards by password. This is to be used
in conjunction with a kernel that enumerates locked sd cards and provides an
ioctl
for rereading the card after unlocking.
Signed-off-by: Peter Turczak <pe...@turczak.de>
---
mmc.c | 24 +++++++++-
mmc.h | 12 +++++
mmc_cmds.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
mmc_cmds.h | 4 ++
4 files changed, 189 insertions(+), 3 deletions(-)
diff --git a/mmc.c b/mmc.c
index 725b842..2f797ea 100644
--- a/mmc.c
+++ b/mmc.c
@@ -36,9 +36,9 @@ struct Command {
if >= 0, number of arguments,
if < 0, _minimum_ number of arguments */
char *verb; /* verb */
- char *help; /* help lines; from the 2nd line onward they
+ char *help; /* help lines; from the 2nd line onward they
are automatically indented */
- char *adv_help; /* advanced help message; from the 2nd line
+ char *adv_help; /* advanced help message; from the 2nd line
onward they are automatically indented */
/* the following fields are run-time filled by the program */
@@ -100,6 +100,26 @@ static struct Command commands[] = {
"Permanently disable the eMMC H/W Reset feature on
<device>.\nNOTE! This is a one-time programmable (unreversible) change.",
NULL
},
+ { do_sd_password_set, -1,
+ "password set", "<password> <device>\n"
+ "Set password for unlocking the SD card, no not lock until next
power up.",
+ NULL
+ },
+ { do_sd_password_lock, -1,
+ "password lock", "<password> <device>\n"
+ "Set password for unlocking the SD card, and lock now.",
+ NULL
+ },
+ { do_sd_password_unlock, -1,
+ "password unlock", "<password> <device>\n"
+ "Unlock the SD card until next power cycling.",
+ NULL
+ },
+ { do_sd_password_delete, -1,
+ "password delete", "<password> <device>\n"
+ "Remove set password from SD.",
+ NULL
+ },
{ do_sanitize, -1,
"sanitize", "<device>\n"
"Send Sanitize command to the <device>.\nThis will delete the
unmapped memory region of the device.",
diff --git a/mmc.h b/mmc.h
index ad07b44..c578ba0 100644
--- a/mmc.h
+++ b/mmc.h
@@ -24,11 +24,15 @@
#define MMC_BLOCK_MAJOR 179
/* From kernel linux/mmc/mmc.h */
+#define MMC_GO_IDLE_STATE 0 /* bc */
+#define MMC_SWITCH_MODE_WRITE_BYTE 0x03 /* Set target to value */
#define MMC_SWITCH 6 /* ac [31:0] See below R1b */
#define MMC_SEND_EXT_CSD 8 /* adtc R1 */
#define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */
#define R1_SWITCH_ERROR (1 << 7) /* sx, c */
#define MMC_SWITCH_MODE_WRITE_BYTE 0x03 /* Set target to value */
+#define MMC_LOCK_UNLOCK 42 /* adtc R1b */
+#define MMC_SET_BLOCKLEN 16 /* ac [31:0] block len R1 */
/*
* EXT_CSD fields
@@ -112,6 +116,9 @@
#define MMC_CMD_AC (0 << 5)
#define MMC_CMD_ADTC (1 << 5)
+#define MMC_CMD_BC (2 << 5)
+#define MMC_CMD_BCR (3 << 5)
+
#define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */
#define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */
@@ -121,3 +128,8 @@
#define MMC_RSP_R1 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R1B
(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
+
+#define MMC_LOCK_UNLOCK_ARG_ERASE (1 << 3)
+#define MMC_LOCK_UNLOCK_ARG_LOCK (1 << 2)
+#define MMC_LOCK_UNLOCK_ARG_CLR (1 << 1)
+#define MMC_LOCK_UNLOCK_ARG_SET (1 << 0)
diff --git a/mmc_cmds.c b/mmc_cmds.c
index ba4f9cf..f455860 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -26,6 +26,7 @@
#include <libgen.h>
#include <limits.h>
#include <ctype.h>
+#include <assert.h>
#include "mmc.h"
#include "mmc_cmds.h"
@@ -72,6 +73,38 @@ int write_extcsd_value(int fd, __u8 index, __u8 value)
return ret;
}
+int get_rca(int fd)
+{
+char orig_filename[1024];
+char temp[1024];
+char *base;
+char *pos;
+
+ memset(orig_filename, 0, sizeof(orig_filename));
+ memset(temp, 0, sizeof(temp));
+
+ /* Get the block device name of the mmcblock device from the
+ * file descriptor
+ */
+ snprintf(temp, sizeof(temp)-1, "/proc/self/fd/%d", fd);
+ if (readlink(temp, orig_filename, sizeof(orig_filename)-1) < 0)
+ return -1;
+
+ /* Fetch the bus device from sysfs */
+ base = basename(orig_filename);
+ snprintf(temp, sizeof(temp)-1, "/sys/class/block/%s/device", base);
+ if (readlink(temp, orig_filename, sizeof(orig_filename)) < 0)
+ return -1;
+
+ /* Extract number from given path, assumed to be something
+ * like /sys/bus/mmc/mmc0:e624 , where e624 specifies the RCA
+ * value
+ */
+ assert(pos = strrchr(orig_filename, ':'));
+ pos++;
+ return strtol(pos, NULL, 16);
+}
+
int send_status(int fd, __u32 *response)
{
int ret = 0;
@@ -79,7 +112,7 @@ int send_status(int fd, __u32 *response)
memset(&idata, 0, sizeof(idata));
idata.opcode = MMC_SEND_STATUS;
- idata.arg = (1 << 16);
+ idata.arg = (get_rca(fd) << 16);
idata.flags = MMC_RSP_R1 | MMC_CMD_AC;
ret = ioctl(fd, MMC_IOC_CMD, &idata);
@@ -1032,6 +1065,123 @@ out_free:
return ret;
}
+int sd_password_command(int fd, int arg, char *pass)
+{
+ int ret = 0;
+ int len;
+ int blocklen;
+ struct mmc_ioc_cmd idata;
+ __u8 data[512];
+ __u32 status;
+
+ /* Send password request */
+ memset(&data, 0, sizeof(data));
+ len = strlen(pass);
+ if (len > 16)
+ len = 16;
+ data[0] = arg;
+ data[1] = len;
+ memcpy(&data[2], pass, len);
+
+ /* Set block length */
+ blocklen = 18;
+
+ memset(&idata, 0, sizeof(idata));
+ idata.write_flag = 0;
+ idata.opcode = MMC_SET_BLOCKLEN;
+ idata.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
+ idata.arg = blocklen;
+ idata.blksz = 0;
+ idata.blocks = 0;
+ idata.cmd_timeout_ms = 500;
+
+ ret = ioctl(fd, MMC_IOC_CMD, &idata);
+ if (ret) {
+ perror("ioctl");
+ return ret;
+ }
+
+ memset(&idata, 0, sizeof(idata));
+ idata.write_flag = 1;
+ idata.opcode = MMC_LOCK_UNLOCK;
+ idata.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+ idata.arg = 0;
+ idata.blocks = 1;
+ idata.blksz = blocklen;
+ idata.cmd_timeout_ms = 500;
+ idata.data_ptr = (__u32)data;
+ ret = ioctl(fd, MMC_IOC_CMD, &idata);
+ if (ret) {
+ perror("ioctl");
+ return ret;
+ }
+
+ ret = send_status(fd, &status);
+ if (ret)
+ return ret;
+ /* Mask out status bits and return them.
+ * BIT24: CARD_IS_LOCKED
+ * BIT25: LOCK_UNLOCK_FAILED
+ */
+ if (ret & (1 << 24))
+ return ret >> 24;
+
+ printf("Unlocking succeeded!\n");
+
+ if (arg == 0) {
+ ret = ioctl(fd, MMC_IOC_RESCAN, NULL);
+ if (ret) {
+ perror("ioctl");
+ return ret;
+ }
+ }
+ return ret;
+}
+
+int do_sd_password(int mmc_cmd, int nargs, char **argv)
+{
+ int fd;
+ char *device;
+ char *pass;
+ int ret;
+
+ CHECK(nargs != 3,
+ "Usage: mmc password set|lock|unlock|delete"
+ " password </path/to/mmcblkX>\n", exit(1));
+
+ pass = argv[1];
+ device = argv[2];
+
+ fd = open(device, O_RDWR);
+ if (fd < 0) {
+ perror("open");
+ exit(1);
+ }
+
+ ret = (sd_password_command(fd, mmc_cmd, pass));
+ return ret;
+}
+
+int do_sd_password_set(int nargs, char **argv)
+{
+ return do_sd_password(MMC_LOCK_UNLOCK_ARG_SET, nargs, argv);
+}
+
+int do_sd_password_lock(int nargs, char **argv)
+{
+ return do_sd_password(MMC_LOCK_UNLOCK_ARG_LOCK, nargs, argv);
+}
+
+int do_sd_password_unlock(int nargs, char **argv)
+{
+ return do_sd_password(0, nargs, argv);
+}
+
+int do_sd_password_delete(int nargs, char **argv)
+{
+ return do_sd_password(MMC_LOCK_UNLOCK_ARG_CLR, nargs, argv);
+}
+
int do_sanitize(int nargs, char **argv)
{
int fd, ret;
diff --git a/mmc_cmds.h b/mmc_cmds.h
index fa347f5..adff8b9 100644
--- a/mmc_cmds.h
+++ b/mmc_cmds.h
@@ -24,6 +24,10 @@ int do_write_boot_en(int nargs, char **argv);
int do_write_bkops_en(int nargs, char **argv);
int do_hwreset_en(int nargs, char **argv);
int do_hwreset_dis(int nargs, char **argv);
+int do_sd_password_delete(int nargs, char **argv);
+int do_sd_password_lock(int nargs, char **argv);
+int do_sd_password_set(int nargs, char **argv);
+int do_sd_password_unlock(int nargs, char **argv);
int do_sanitize(int nargs, char **argv);
int do_status_get(int nargs, char **argv);
int do_enh_area_set(int nargs, char **argv);
--
1.7.0.4
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