dm crypt: use u64 instead of sector_t to store iv_offset

[ Upstream commit 8d683dcd65c037efc9fb38c696ec9b65b306e573 ]

The iv_offset in the mapping table of crypt target is a 64bit number when
IV algorithm is plain64, plain64be, essiv or benbi. It will be assigned to
iv_offset of struct crypt_config, cc_sector of struct convert_context and
iv_sector of struct dm_crypt_request. These structures members are defined
as a sector_t. But sector_t is 32bit when CONFIG_LBDAF is not set in 32bit
kernel. In this situation sector_t is not big enough to store the 64bit
iv_offset.

Here is a reproducer.
Prepare test image and device (loop is automatically allocated by cryptsetup):

  # dd if=/dev/zero of=tst.img bs=1M count=1
  # echo "tst"|cryptsetup open --type plain -c aes-xts-plain64 \
  --skip 500000000000000000 tst.img test

On 32bit system (use IV offset value that overflows to 64bit; CONFIG_LBDAF if off)
and device checksum is wrong:

  # dmsetup table test --showkeys
  0 2048 crypt aes-xts-plain64 dfa7cfe3c481f2239155739c42e539ae8f2d38f304dcc89d20b26f69daaf0933 3551657984 7:0 0

  # sha256sum /dev/mapper/test
  533e25c09176632b3794f35303488c4a8f3f965dffffa6ec2df347c168cb6c19 /dev/mapper/test

On 64bit system (and on 32bit system with the patch), table and checksum is now correct:

  # dmsetup table test --showkeys
  0 2048 crypt aes-xts-plain64 dfa7cfe3c481f2239155739c42e539ae8f2d38f304dcc89d20b26f69daaf0933 500000000000000000 7:0 0

  # sha256sum /dev/mapper/test
  5d16160f9d5f8c33d8051e65fdb4f003cc31cd652b5abb08f03aa6fce0df75fc /dev/mapper/test

Signed-off-by: AliOS system security <alios_sys_security@linux.alibaba.com>
Tested-and-Reviewed-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 0481223..f192ba3 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -49,7 +49,7 @@ struct convert_context {
        struct bio *bio_out;
        struct bvec_iter iter_in;
        struct bvec_iter iter_out;
-       sector_t cc_sector;
+       u64 cc_sector;
        atomic_t cc_pending;
        union {
                struct skcipher_request *req;
@@ -81,7 +81,7 @@ struct dm_crypt_request {
        struct convert_context *ctx;
        struct scatterlist sg_in[4];
        struct scatterlist sg_out[4];
-       sector_t iv_sector;
+       u64 iv_sector;
 };
 
 struct crypt_config;
@@ -160,7 +160,7 @@ struct crypt_config {
                struct iv_lmk_private lmk;
                struct iv_tcw_private tcw;
        } iv_gen_private;
-       sector_t iv_offset;
+       u64 iv_offset;
        unsigned int iv_size;
        unsigned short int sector_size;
        unsigned char sector_shift;