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path: root/drivers/md/dm-verity-target.c
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Diffstat (limited to 'drivers/md/dm-verity-target.c')
-rw-r--r--drivers/md/dm-verity-target.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index 12decdbd722d..fc65f0dedf7f 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -99,10 +99,26 @@ static int verity_hash_update(struct dm_verity *v, struct ahash_request *req,
{
struct scatterlist sg;
- sg_init_one(&sg, data, len);
- ahash_request_set_crypt(req, &sg, NULL, len);
-
- return crypto_wait_req(crypto_ahash_update(req), wait);
+ if (likely(!is_vmalloc_addr(data))) {
+ sg_init_one(&sg, data, len);
+ ahash_request_set_crypt(req, &sg, NULL, len);
+ return crypto_wait_req(crypto_ahash_update(req), wait);
+ } else {
+ do {
+ int r;
+ size_t this_step = min_t(size_t, len, PAGE_SIZE - offset_in_page(data));
+ flush_kernel_vmap_range((void *)data, this_step);
+ sg_init_table(&sg, 1);
+ sg_set_page(&sg, vmalloc_to_page(data), this_step, offset_in_page(data));
+ ahash_request_set_crypt(req, &sg, NULL, this_step);
+ r = crypto_wait_req(crypto_ahash_update(req), wait);
+ if (unlikely(r))
+ return r;
+ data += this_step;
+ len -= this_step;
+ } while (len);
+ return 0;
+ }
}
/*