The alignment calculation of xcbc_tfm_ctx uses alg->cra_alignmask
and not alg->cra_alignmask + 1 as it should. This led to frequent
crashes during the selftest of xcbc(aes-asm) on x86_64
machines. This patch fixes this. Also we use the alignmask
of xcbc and not the alignmask of the underlying algorithm
for the alignmnent calculation in xcbc_create now.
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
---
crypto/xcbc.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/crypto/xcbc.c b/crypto/xcbc.c
index 1e30b31..bb7b67f 100644
--- a/crypto/xcbc.c
+++ b/crypto/xcbc.c
@@ -199,6 +199,7 @@ static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct shash_instance *inst;
struct crypto_alg *alg;
+ unsigned long alignmask;
int err;
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
@@ -228,19 +229,20 @@ static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
if (err)
goto out_free_inst;
+ alignmask = alg->cra_alignmask | 3;
+ inst->alg.base.cra_alignmask = alignmask;
inst->alg.base.cra_priority = alg->cra_priority;
inst->alg.base.cra_blocksize = alg->cra_blocksize;
- inst->alg.base.cra_alignmask = alg->cra_alignmask | 3;
inst->alg.digestsize = alg->cra_blocksize;
inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx),
crypto_tfm_ctx_alignment()) +
- (alg->cra_alignmask &
+ (alignmask &
~(crypto_tfm_ctx_alignment() - 1)) +
alg->cra_blocksize * 2;
inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx),
- alg->cra_alignmask) +
+ alignmask + 1) +
alg->cra_blocksize * 2;
inst->alg.base.cra_init = xcbc_init_tfm;
inst->alg.base.cra_exit = xcbc_exit_tfm;
--
1.5.4.2
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