crypto: arm64-aes - fix encryption of unaligned data

cryptsetup fails on arm64 when using kernel encryption via AF_ALG socket.
See https://bugzilla.redhat.com/show_bug.cgi?id=1122937

The bug is caused by incorrect handling of unaligned data in
arch/arm64/crypto/aes-glue.c. Cryptsetup creates a buffer that is aligned
on 8 bytes, but not on 16 bytes. It opens AF_ALG socket and uses the
socket to encrypt data in the buffer. The arm64 crypto accelerator causes
data corruption or crashes in the scatterwalk_pagedone.

This patch fixes the bug by passing the residue bytes that were not
processed as the last parameter to blkcipher_walk_done.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c
index 60f2f4c12256..79cd911ef88c 100644
--- a/arch/arm64/crypto/aes-glue.c
+++ b/arch/arm64/crypto/aes-glue.c
@@ -106,7 +106,7 @@ static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
         for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
                 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key_enc, rounds, blocks, first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();
         return err;
@@ -128,7 +128,7 @@ static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
         for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
                 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key_dec, rounds, blocks, first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();
         return err;
@@ -151,7 +151,7 @@ static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                 aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key_enc, rounds, blocks, walk.iv,
                                 first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();
         return err;
@@ -174,7 +174,7 @@ static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                 aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key_dec, rounds, blocks, walk.iv,
                                 first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();
         return err;
@@ -243,7 +243,7 @@ static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key1.key_enc, rounds, blocks,
                                 (u8 *)ctx->key2.key_enc, walk.iv, first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();
 
@@ -267,7 +267,7 @@ static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
                                 (u8 *)ctx->key1.key_dec, rounds, blocks,
                                 (u8 *)ctx->key2.key_enc, walk.iv, first);
-                err = blkcipher_walk_done(desc, &walk, 0);
+                err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
         }
         kernel_neon_end();