If the user sets panic_on_error and doesn't set panic_on_corruption,
dm-verity should not panic on data mismatch. But, currently it panics,
because it treats data mismatch as I/O error.
This commit fixes the logic so that if there is data mismatch and
panic_on_corruption or restart_on_corruption is not selected, the system
won't restart or panic.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Fixes: f811b83879fb ("dm-verity: introduce the options restart_on_error and panic_on_error")
---
drivers/md/dm-verity-target.c | 9 ++++++---
drivers/md/dm-verity.h | 1 +
2 files changed, 7 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/md/dm-verity-target.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-verity-target.c 2024-10-16 16:42:46.000000000 +0200
+++ linux-2.6/drivers/md/dm-verity-target.c 2024-10-16 17:11:13.000000000 +0200
@@ -356,9 +356,9 @@ static int verity_verify_level(struct dm
else if (verity_handle_err(v,
DM_VERITY_BLOCK_TYPE_METADATA,
hash_block)) {
- struct bio *bio =
- dm_bio_from_per_bio_data(io,
- v->ti->per_io_data_size);
+ struct bio *bio;
+ io->had_mismatch = true;
+ bio = dm_bio_from_per_bio_data(io, v->ti->per_io_data_size);
dm_audit_log_bio(DM_MSG_PREFIX, "verify-metadata", bio,
block, 0);
r = -EIO;
@@ -482,6 +482,7 @@ static int verity_handle_data_hash_misma
return -EIO; /* Error correction failed; Just return error */
if (verity_handle_err(v, DM_VERITY_BLOCK_TYPE_DATA, blkno)) {
+ io->had_mismatch = true;
dm_audit_log_bio(DM_MSG_PREFIX, "verify-data", bio, blkno, 0);
return -EIO;
}
@@ -606,6 +607,7 @@ static void verity_finish_io(struct dm_v
if (unlikely(status != BLK_STS_OK) &&
unlikely(!(bio->bi_opf & REQ_RAHEAD)) &&
+ !io->had_mismatch &&
!verity_is_system_shutting_down()) {
if (v->error_mode == DM_VERITY_MODE_PANIC) {
panic("dm-verity device has I/O error");
@@ -779,6 +781,7 @@ static int verity_map(struct dm_target *
io->orig_bi_end_io = bio->bi_end_io;
io->block = bio->bi_iter.bi_sector >> (v->data_dev_block_bits - SECTOR_SHIFT);
io->n_blocks = bio->bi_iter.bi_size >> v->data_dev_block_bits;
+ io->had_mismatch = false;
bio->bi_end_io = verity_end_io;
bio->bi_private = io;
Index: linux-2.6/drivers/md/dm-verity.h
===================================================================
--- linux-2.6.orig/drivers/md/dm-verity.h 2024-10-16 16:41:30.000000000 +0200
+++ linux-2.6/drivers/md/dm-verity.h 2024-10-16 17:06:37.000000000 +0200
@@ -92,6 +92,7 @@ struct dm_verity_io {
sector_t block;
unsigned int n_blocks;
bool in_bh;
+ bool had_mismatch;
struct work_struct work;
struct work_struct bh_work;
