AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 16:50:54 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

crypto: arm64/gcm-aes-ce - fix no-NEON fallback code

Browse Source 
The arm64 gcm-aes-ce algorithm is failing the extra crypto self-tests
following my patches to test the !may_use_simd() code paths, which
previously were untested.  The problem is that in the !may_use_simd()
case, an odd number of AES blocks can be processed within each step of
the skcipher_walk.  However, the skcipher_walk is being done with a
"stride" of 2 blocks and is advanced by an even number of blocks after
each step.  This causes the encryption to produce the wrong ciphertext
and authentication tag, and causes the decryption to incorrectly fail.

Fix it by only processing an even number of blocks per step.

Fixes: c2b24c36e0 ("crypto: arm64/aes-gcm-ce - fix scatterwalk API violation")
Fixes: 71e52c278c ("crypto: arm64/aes-ce-gcm - operate on two input blocks at a time")
Cc: <stable@vger.kernel.org> # v4.19+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-03-12 22:12:46 -07:00 committed by Herbert Xu
parent 7aceaaef04
commit 580e295178
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/arm64/crypto/ghash-ce-glue.c
View File

@ -473,9 +473,11 @@ static int gcm_encrypt(struct aead_request *req)
put_unaligned_be32(2, iv + GCM_IV_SIZE);
while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
int blocks = walk.nbytes / AES_BLOCK_SIZE;
const int blocks =
walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
u8 *dst = walk.dst.virt.addr;
u8 *src = walk.src.virt.addr;
int remaining = blocks;
do {
__aes_arm64_encrypt(ctx->aes_key.key_enc,
@ -485,9 +487,9 @@ static int gcm_encrypt(struct aead_request *req)
dst += AES_BLOCK_SIZE;
src += AES_BLOCK_SIZE;
} while (--blocks > 0);
} while (--remaining > 0);
ghash_do_update(walk.nbytes / AES_BLOCK_SIZE, dg,
ghash_do_update(blocks, dg,
walk.dst.virt.addr, &ctx->ghash_key,
NULL, pmull_ghash_update_p64);
@ -609,7 +611,7 @@ static int gcm_decrypt(struct aead_request *req)
put_unaligned_be32(2, iv + GCM_IV_SIZE);
while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
int blocks = walk.nbytes / AES_BLOCK_SIZE;
int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
u8 *dst = walk.dst.virt.addr;
u8 *src = walk.src.virt.addr;