verity: remove BUG_ON alignment check

dm-bht.c

  /*
  * Copyright (C) 2010 The Chromium OS Authors <chromium-os-dev@chromium.org>
  *
  * Device-Mapper block hash tree interface.
  * See Documentation/device-mapper/dm-bht.txt for details.
  *
  * This file is released under the GPL.
  */
 
 #include <asm/atomic.h>
@@ skipping 87 matching lines @@
 static int dm_bht_compute_hash(struct dm_bht *bht, const void *block,
                                u8 *digest)
 {
         struct hash_desc *hash_desc = &bht->hash_desc[smp_processor_id()];
         struct scatterlist sg;
 
         /* TODO(msb): Once we supporting block_size < PAGE_SIZE, change this to:
          *            offset_into_page + length < page_size
          * For now just check that block is page-aligned.
          */
-        BUG_ON(!IS_ALIGNED((uintptr_t)block, PAGE_SIZE));
+        /*
+         * TODO(msb): Re-enable once user-space code is modified to use
+         *            aligned buffers.
+         * BUG_ON(!IS_ALIGNED((uintptr_t)block, PAGE_SIZE));
+         */
 
         sg_init_table(&sg, 1);
         sg_set_buf(&sg, block, PAGE_SIZE);
         /* Note, this is synchronous. */
         if (crypto_hash_init(hash_desc)) {
                 DMCRIT("failed to reinitialize crypto hash (proc:%d)",
                         smp_processor_id());
                 return -EINVAL;
         }
         if (crypto_hash_digest(hash_desc, &sg, PAGE_SIZE, digest)) {
@@ skipping 1064 matching lines @@
                 DMERR("no root digest exists to export");
                 if (available > 0)
                         *hexdigest = 0;
                 return -1;
         }
         dm_bht_bin_to_hex(bht->root_digest, hexdigest, bht->digest_size);
         return 0;
 }
 EXPORT_SYMBOL(dm_bht_root_hexdigest);