From 9d7be234e1c516448e411320b96cbd219424d60f Mon Sep 17 00:00:00 2001 From: Nicolas Schichan Date: Wed, 23 Nov 2022 19:39:20 +0100 Subject: [PATCH 4/7] mmc-utils: allow to permanently disable password function. --- mmc.c | 5 +++++ mmc_cmds.c | 37 +++++++++++++++++++++++++++++++++++++ mmc_cmds.h | 1 + 3 files changed, 43 insertions(+) diff --git a/mmc.c b/mmc.c index f01118d..ff6a7e4 100644 --- a/mmc.c +++ b/mmc.c @@ -66,6 +66,11 @@ static struct Command commands[] = { "permanently disable permanent write protection on boot partitions", NULL, }, + { do_pswd_perm_dis, -1, + "pswd perm dis", "\n" + "permanently disable password configuration for .", + NULL, + }, { do_writeprotect_device_perm_dis, -1, "writeprotect device perm dis", "\n" "permanently disable permanent write protection on all partitions", diff --git a/mmc_cmds.c b/mmc_cmds.c index b51f813..8404b9f 100644 --- a/mmc_cmds.c +++ b/mmc_cmds.c @@ -465,6 +465,43 @@ int do_writeprotect_user_perm_dis(int nargs, char **argv) return ret; } +int do_pswd_perm_dis(int nargs, char **argv) +{ + __u8 ext_csd[512], value; + const char *device = argv[1]; + int fd, ret = 0; + + if (nargs != 2) { + fprintf(stderr, "Usage: mmc pswd perm dis \n"); + exit(1); + } + + fd = open(device, O_RDWR); + if (fd < 0) { + perror("open"); + exit(1); + } + + ret = read_extcsd(fd, ext_csd); + if (ret) { + fprintf(stderr, "Could not read EXT_CSD from %s\n", device); + exit(1); + } + + value = ext_csd[EXT_CSD_USER_WP]; + value |= USER_WP_PERM_PSWD_DIS; + + ret = write_extcsd_value(fd, EXT_CSD_USER_WP, value, 0); + if (ret) { + fprintf(stderr, "Could not write 0x%02x to " + "EXT_CSD[%d] in %s\n", + value, EXT_CSD_USER_WP, device); + exit(1); + } + + return ret; +} + static char *prot_desc[] = { "No", "Temporary", diff --git a/mmc_cmds.h b/mmc_cmds.h index 4cf522c..f11d193 100644 --- a/mmc_cmds.h +++ b/mmc_cmds.h @@ -24,6 +24,7 @@ int do_writeprotect_boot_get(int nargs, char **argv); int do_writeprotect_boot_set(int nargs, char **argv); int do_writeprotect_boot_perm_dis(int nargs, char **argv); int do_writeprotect_device_perm_dis(int nargs, char **argv); +int do_pswd_perm_dis(int nargs, char **argv); int do_writeprotect_user_perm_dis(int nargs, char **argv); int do_writeprotect_user_get(int nargs, char **argv); int do_writeprotect_user_set(int nargs, char **argv); -- 2.34.1