path: root/drivers
diff options
authorMilan Broz <>2021-02-23 21:21:21 +0100
committerMike Snitzer <>2021-03-04 15:08:18 -0500
commitdf7b59ba9245c4a3115ebaa905e3e5719a3810da (patch)
tree1525a3b4fb09e4dcf975c2d67ee93eb8ff65a50d /drivers
parenta14e5ec66a7a66e57b24e2469f9212a78460207e (diff)
dm verity: fix FEC for RS roots unaligned to block size
Optional Forward Error Correction (FEC) code in dm-verity uses Reed-Solomon code and should support roots from 2 to 24. The error correction parity bytes (of roots lengths per RS block) are stored on a separate device in sequence without any padding. Currently, to access FEC device, the dm-verity-fec code uses dm-bufio client with block size set to verity data block (usually 4096 or 512 bytes). Because this block size is not divisible by some (most!) of the roots supported lengths, data repair cannot work for partially stored parity bytes. This fix changes FEC device dm-bufio block size to "roots << SECTOR_SHIFT" where we can be sure that the full parity data is always available. (There cannot be partial FEC blocks because parity must cover whole sectors.) Because the optional FEC starting offset could be unaligned to this new block size, we have to use dm_bufio_set_sector_offset() to configure it. The problem is easily reproduced using veritysetup, e.g. for roots=13: # create verity device with RS FEC dd if=/dev/urandom of=data.img bs=4096 count=8 status=none veritysetup format data.img hash.img --fec-device=fec.img --fec-roots=13 | awk '/^Root hash/{ print $3 }' >roothash # create an erasure that should be always repairable with this roots setting dd if=/dev/zero of=data.img conv=notrunc bs=1 count=8 seek=4088 status=none # try to read it through dm-verity veritysetup open data.img test hash.img --fec-device=fec.img --fec-roots=13 $(cat roothash) dd if=/dev/mapper/test of=/dev/null bs=4096 status=noxfer # wait for possible recursive recovery in kernel udevadm settle veritysetup close test With this fix, errors are properly repaired. device-mapper: verity-fec: 7:1: FEC 0: corrected 8 errors ... Without it, FEC code usually ends on unrecoverable failure in RS decoder: device-mapper: verity-fec: 7:1: FEC 0: failed to correct: -74 ... This problem is present in all kernels since the FEC code's introduction (kernel 4.5). It is thought that this problem is not visible in Android ecosystem because it always uses a default RS roots=2. Depends-on: a14e5ec66a7a ("dm bufio: subtract the number of initial sectors in dm_bufio_get_device_size") Signed-off-by: Milan Broz <> Tested-by: Jérôme Carretero <> Reviewed-by: Sami Tolvanen <> Cc: # 4.5+ Signed-off-by: Mike Snitzer <>
Diffstat (limited to 'drivers')
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
index fb41b4f23c48..66f4c6398f67 100644
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -61,19 +61,18 @@ static int fec_decode_rs8(struct dm_verity *v, struct dm_verity_fec_io *fio,
static u8 *fec_read_parity(struct dm_verity *v, u64 rsb, int index,
unsigned *offset, struct dm_buffer **buf)
- u64 position, block;
+ u64 position, block, rem;
u8 *res;
position = (index + rsb) * v->fec->roots;
- block = position >> v->data_dev_block_bits;
- *offset = (unsigned)(position - (block << v->data_dev_block_bits));
+ block = div64_u64_rem(position, v->fec->roots << SECTOR_SHIFT, &rem);
+ *offset = (unsigned)rem;
- res = dm_bufio_read(v->fec->bufio, v->fec->start + block, buf);
+ res = dm_bufio_read(v->fec->bufio, block, buf);
if (IS_ERR(res)) {
DMERR("%s: FEC %llu: parity read failed (block %llu): %ld",
v->data_dev->name, (unsigned long long)rsb,
- (unsigned long long)(v->fec->start + block),
- PTR_ERR(res));
+ (unsigned long long)block, PTR_ERR(res));
*buf = NULL;
@@ -155,7 +154,7 @@ static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
/* read the next block when we run out of parity bytes */
offset += v->fec->roots;
- if (offset >= 1 << v->data_dev_block_bits) {
+ if (offset >= v->fec->roots << SECTOR_SHIFT) {
par = fec_read_parity(v, rsb, block_offset, &offset, &buf);
@@ -674,7 +673,7 @@ int verity_fec_ctr(struct dm_verity *v)
struct dm_verity_fec *f = v->fec;
struct dm_target *ti = v->ti;
- u64 hash_blocks;
+ u64 hash_blocks, fec_blocks;
int ret;
if (!verity_fec_is_enabled(v)) {
@@ -744,15 +743,17 @@ int verity_fec_ctr(struct dm_verity *v)
f->bufio = dm_bufio_client_create(f->dev->bdev,
- 1 << v->data_dev_block_bits,
+ f->roots << SECTOR_SHIFT,
1, 0, NULL, NULL);
if (IS_ERR(f->bufio)) {
ti->error = "Cannot initialize FEC bufio client";
return PTR_ERR(f->bufio);
- if (dm_bufio_get_device_size(f->bufio) <
- ((f->start + f->rounds * f->roots) >> v->data_dev_block_bits)) {
+ dm_bufio_set_sector_offset(f->bufio, f->start << (v->data_dev_block_bits - SECTOR_SHIFT));
+ fec_blocks = div64_u64(f->rounds * f->roots, v->fec->roots << SECTOR_SHIFT);
+ if (dm_bufio_get_device_size(f->bufio) < fec_blocks) {
ti->error = "FEC device is too small";
return -E2BIG;