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authorAliOS system security <alios_sys_security@linux.alibaba.com>2018-11-05 15:31:42 +0800
committerMike Snitzer <snitzer@redhat.com>2018-12-18 09:02:26 -0500
commit8d683dcd65c037efc9fb38c696ec9b65b306e573 (patch)
tree1b45394594d37d7ecc24a77d6ac07767ea4323e9 /drivers/md
parentd7e6b8dfc7bcb3f4f3a18313581f67486a725b52 (diff)
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 <alios_sys_security@linux.alibaba.com> Tested-and-Reviewed-by: Milan Broz <gmazyland@gmail.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-crypt.c6
1 files 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;