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authorMikulas Patocka <mpatocka@redhat.com>2017-11-07 16:35:57 +0100
committerMike Snitzer <snitzer@redhat.com>2017-11-10 21:44:58 +0100
commit0440d5c0ca9744b92a07aeb6df0a9a75db6f4280 (patch)
treeaedd27d5797516e04afecd33f0d224201042ea2b /drivers/md/dm-crypt.c
parentdm: small cleanup in dm_get_md() (diff)
downloadlinux-0440d5c0ca9744b92a07aeb6df0a9a75db6f4280.tar.xz
linux-0440d5c0ca9744b92a07aeb6df0a9a75db6f4280.zip
dm crypt: allow unaligned bv_offset
When slub_debug is enabled kmalloc returns unaligned memory. XFS uses this unaligned memory for its buffers (if an unaligned buffer crosses a page, XFS frees it and allocates a full page instead - see the function xfs_buf_allocate_memory). dm-crypt checks if bv_offset is aligned on page size and these checks fail with slub_debug and XFS. Fix this bug by removing the bv_offset checks. Switch to checking if bv_len is aligned instead of bv_offset (this check should be sufficient to prevent overruns if a bio with too small bv_len is received). Fixes: 8f0009a22517 ("dm crypt: optionally support larger encryption sector size") Cc: stable@vger.kernel.org # v4.12+ Reported-by: Bruno Prémont <bonbons@sysophe.eu> Tested-by: Bruno Prémont <bonbons@sysophe.eu> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Milan Broz <gmazyland@gmail.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-crypt.c')
-rw-r--r--drivers/md/dm-crypt.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 96ab46512e1f..9fc12f556534 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1075,7 +1075,7 @@ static int crypt_convert_block_aead(struct crypt_config *cc,
BUG_ON(cc->integrity_iv_size && cc->integrity_iv_size != cc->iv_size);
/* Reject unexpected unaligned bio. */
- if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
+ if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
return -EIO;
dmreq = dmreq_of_req(cc, req);
@@ -1168,7 +1168,7 @@ static int crypt_convert_block_skcipher(struct crypt_config *cc,
int r = 0;
/* Reject unexpected unaligned bio. */
- if (unlikely(bv_in.bv_offset & (cc->sector_size - 1)))
+ if (unlikely(bv_in.bv_len & (cc->sector_size - 1)))
return -EIO;
dmreq = dmreq_of_req(cc, req);