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dm-crypt: track tag_offset in convert_context

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commit 8b8f8037765757861f899ed3a2bfb34525b5c065 upstream.

dm-crypt uses tag_offset to index the integrity metadata for each crypt
sector. When the initial crypt_convert() returns BLK_STS_DEV_RESOURCE,
dm-crypt will try to continue the crypt/decrypt procedure in a kworker.
However, it resets tag_offset as zero instead of using the tag_offset
related with current sector. It may return unexpected data when using
random IV or return unexpected integrity related error.

Fix the problem by tracking tag_offset in per-IO convert_context.
Therefore, when the crypt/decrypt procedure continues in a kworker, it
could use the next tag_offset saved in convert_context.

Fixes: 8abec36d12 ("dm crypt: do not wait for backlogged crypto request completion in softirq")
Cc: stable@vger.kernel.org
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hou Tao 2025-01-20 16:29:51 +08:00 committed by Greg Kroah-Hartman
parent eaf019088c
commit 7428e565c4
1 changed files with 7 additions and 6 deletions
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13
drivers/md/dm-crypt.c
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@ -56,6 +56,7 @@ struct convert_context {
struct bio *bio_out;
struct bvec_iter iter_out;
atomic_t cc_pending;
unsigned int tag_offset;
u64 cc_sector;
union {
struct skcipher_request *req;
@ -1223,6 +1224,7 @@ static void crypt_convert_init(struct crypt_config *cc,
if (bio_out)
ctx->iter_out = bio_out->bi_iter;
ctx->cc_sector = sector + cc->iv_offset;
ctx->tag_offset = 0;
init_completion(&ctx->restart);
}
@ -1554,7 +1556,6 @@ static void crypt_free_req(struct crypt_config *cc, void *req, struct bio *base_
static blk_status_t crypt_convert(struct crypt_config *cc,
struct convert_context *ctx, bool atomic, bool reset_pending)
{
unsigned int tag_offset = 0;
unsigned int sector_step = cc->sector_size >> SECTOR_SHIFT;
int r;
@ -1577,9 +1578,9 @@ static blk_status_t crypt_convert(struct crypt_config *cc,
atomic_inc(&ctx->cc_pending);
if (crypt_integrity_aead(cc))
r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, tag_offset);
r = crypt_convert_block_aead(cc, ctx, ctx->r.req_aead, ctx->tag_offset);
else
r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, tag_offset);
r = crypt_convert_block_skcipher(cc, ctx, ctx->r.req, ctx->tag_offset);
switch (r) {
/*
@ -1599,8 +1600,8 @@ static blk_status_t crypt_convert(struct crypt_config *cc,
* exit and continue processing in a workqueue
*/
ctx->r.req = NULL;
ctx->tag_offset++;
ctx->cc_sector += sector_step;
tag_offset++;
return BLK_STS_DEV_RESOURCE;
}
} else {
@ -1614,8 +1615,8 @@ static blk_status_t crypt_convert(struct crypt_config *cc,
*/
case -EINPROGRESS:
ctx->r.req = NULL;
ctx->tag_offset++;
ctx->cc_sector += sector_step;
tag_offset++;
continue;
/*
* The request was already processed (synchronously).
@ -1623,7 +1624,7 @@ static blk_status_t crypt_convert(struct crypt_config *cc,
case 0:
atomic_dec(&ctx->cc_pending);
ctx->cc_sector += sector_step;
tag_offset++;
ctx->tag_offset++;
if (!atomic)
cond_resched();
continue;