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dm verity: add "panic_on_corruption" error handling mode

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Samsung smart phones may need the ability to panic on corruption.  Not
all devices provide the bootloader support needed to use the existing
"restart_on_corruption" mode.  Additional details for why Samsung needs
this new mode can be found here:
https://www.redhat.com/archives/dm-devel/2020-June/msg00235.html

Signed-off-by: jhs2.lee <jhs2.lee@samsung.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
JeongHyeon Lee 2020-06-18 15:56:50 +09:00 committed by Mike Snitzer
parent 374117ad47
commit e1fef0b08e
3 changed files with 18 additions and 2 deletions
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4
Documentation/admin-guide/device-mapper/verity.rst
View File

@ -83,6 +83,10 @@ restart_on_corruption
not compatible with ignore_corruption and requires user space support to
avoid restart loops.
panic_on_corruption
Panic the device when a corrupted block is discovered. This option is
not compatible with ignore_corruption and restart_on_corruption.
ignore_zero_blocks
Do not verify blocks that are expected to contain zeroes and always return
zeroes instead. This may be useful if the partition contains unused blocks

13
drivers/md/dm-verity-target.c
View File

@ -30,6 +30,7 @@
#define DM_VERITY_OPT_LOGGING "ignore_corruption"
#define DM_VERITY_OPT_RESTART "restart_on_corruption"
#define DM_VERITY_OPT_PANIC "panic_on_corruption"
#define DM_VERITY_OPT_IGN_ZEROES "ignore_zero_blocks"
#define DM_VERITY_OPT_AT_MOST_ONCE "check_at_most_once"
@ -254,6 +255,9 @@ out:
if (v->mode == DM_VERITY_MODE_RESTART)
kernel_restart("dm-verity device corrupted");
if (v->mode == DM_VERITY_MODE_PANIC)
panic("dm-verity device corrupted");
return 1;
}
@ -742,6 +746,9 @@ static void verity_status(struct dm_target *ti, status_type_t type,
case DM_VERITY_MODE_RESTART:
DMEMIT(DM_VERITY_OPT_RESTART);
break;
case DM_VERITY_MODE_PANIC:
DMEMIT(DM_VERITY_OPT_PANIC);
break;
default:
BUG();
}
@ -907,6 +914,10 @@ static int verity_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
v->mode = DM_VERITY_MODE_RESTART;
continue;
} else if (!strcasecmp(arg_name, DM_VERITY_OPT_PANIC)) {
v->mode = DM_VERITY_MODE_PANIC;
continue;
} else if (!strcasecmp(arg_name, DM_VERITY_OPT_IGN_ZEROES)) {
r = verity_alloc_zero_digest(v);
if (r) {
@ -1221,7 +1232,7 @@ bad:
static struct target_type verity_target = {
.name = "verity",
.version = {1, 6, 0},
.version = {1, 7, 0},
.module = THIS_MODULE,
.ctr = verity_ctr,
.dtr = verity_dtr,

3
drivers/md/dm-verity.h
View File

@ -20,7 +20,8 @@
enum verity_mode {
DM_VERITY_MODE_EIO,
DM_VERITY_MODE_LOGGING,
DM_VERITY_MODE_RESTART
DM_VERITY_MODE_RESTART,
DM_VERITY_MODE_PANIC
};
enum verity_block_type {