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ANDROID: set emulate_zone_append=true in dm-default-key

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All zone append writes to a zone of a zoned block device will
have the same BIO sector, the start of the zone. When the
cypher IV mode uses sector values, all data targeting a
zone will be encrypted using the first sector numbers of the
zone. This will not result in write errors but will
cause most reads to fail as reads will use the sector values
for the actual data locations, resulting in IV mismatch.
To avoid this problem, ask DM core to emulate zone append
operations with regular writes.

Bug: 374251833

Change-Id: I620687c41d04e9ea1f54c5037dae97ddd5bb67eb
Signed-off-by: LongPing Wei <weilongping@oppo.com>
This commit is contained in:
LongPing Wei
2024-10-17 10:03:25 +08:00
parent de863f65b8
commit 05e1912555
1 changed files with 16 additions and 0 deletions
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drivers/md/dm-default-key.c
+16
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@@ -217,6 +217,22 @@ static int default_key_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
dkc->start = tmpll;
if (bdev_is_zoned(dkc->dev->bdev)) {
/*
* All zone append writes to a zone of a zoned block device will
* have the same BIO sector, the start of the zone. When the
* cypher IV mode uses sector values, all data targeting a
* zone will be encrypted using the first sector numbers of the
* zone. This will not result in write errors but will
* cause most reads to fail as reads will use the sector values
* for the actual data locations, resulting in IV mismatch.
* To avoid this problem, ask DM core to emulate zone append
* operations with regular writes.
*/
DMDEBUG("Zone append operations will be emulated");
ti->emulate_zone_append = true;
}
/* optional arguments */
dkc->sector_size = SECTOR_SIZE;
if (argc > 5) {