From 8d683dcd65c037efc9fb38c696ec9b65b306e573 Mon Sep 17 00:00:00 2001 From: AliOS system security Date: Mon, 5 Nov 2018 15:31:42 +0800 Subject: [PATCH] dm crypt: use u64 instead of sector_t to store iv_offset 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 Tested-and-Reviewed-by: Milan Broz Signed-off-by: Mike Snitzer --- drivers/md/dm-crypt.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index b8eec515a003..9a4dec0a0f71 100644 --- 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;