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s390/crypto: Remove VLA usage of skcipher 

In the quest to remove all stack VLA usage from the kernel[1], this
replaces struct crypto_skcipher and SKCIPHER_REQUEST_ON_STACK() usage
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux-s390@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Kees Cook 2018-09-18 19:10:42 -07:00 committed by Herbert Xu
parent 3103f4a71b
commit 531fa5d620
1 changed files with 24 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
arch/s390/crypto/aes_s390.c
View File

@ -44,7 +44,7 @@ struct s390_aes_ctx {
int key_len;
unsigned long fc;
union {
struct crypto_skcipher *blk;
struct crypto_sync_skcipher *blk;
struct crypto_cipher *cip;
} fallback;
};
@ -54,7 +54,7 @@ struct s390_xts_ctx {
u8 pcc_key[32];
int key_len;
unsigned long fc;
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
};
struct gcm_sg_walk {
@ -184,14 +184,15 @@ static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
unsigned int ret;
crypto_skcipher_clear_flags(sctx->fallback.blk, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
crypto_sync_skcipher_clear_flags(sctx->fallback.blk,
CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_skcipher_setkey(sctx->fallback.blk, key, len);
ret = crypto_sync_skcipher_setkey(sctx->fallback.blk, key, len);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= crypto_skcipher_get_flags(sctx->fallback.blk) &
tfm->crt_flags |= crypto_sync_skcipher_get_flags(sctx->fallback.blk) &
CRYPTO_TFM_RES_MASK;
return ret;
@ -204,9 +205,9 @@ static int fallback_blk_dec(struct blkcipher_desc *desc,
unsigned int ret;
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
skcipher_request_set_tfm(req, sctx->fallback.blk);
skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
@ -223,9 +224,9 @@ static int fallback_blk_enc(struct blkcipher_desc *desc,
unsigned int ret;
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
skcipher_request_set_tfm(req, sctx->fallback.blk);
skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
@ -306,8 +307,7 @@ static int fallback_init_blk(struct crypto_tfm *tfm)
const char *name = tfm->__crt_alg->cra_name;
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
sctx->fallback.blk = crypto_alloc_skcipher(name, 0,
CRYPTO_ALG_ASYNC |
sctx->fallback.blk = crypto_alloc_sync_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(sctx->fallback.blk)) {
@ -323,7 +323,7 @@ static void fallback_exit_blk(struct crypto_tfm *tfm)
{
struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
crypto_free_skcipher(sctx->fallback.blk);
crypto_free_sync_skcipher(sctx->fallback.blk);
}
static struct crypto_alg ecb_aes_alg = {
@ -453,14 +453,15 @@ static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
unsigned int ret;
crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
crypto_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
crypto_sync_skcipher_clear_flags(xts_ctx->fallback,
CRYPTO_TFM_REQ_MASK);
crypto_sync_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
CRYPTO_TFM_REQ_MASK);
ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len);
ret = crypto_sync_skcipher_setkey(xts_ctx->fallback, key, len);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
tfm->crt_flags |= crypto_skcipher_get_flags(xts_ctx->fallback) &
tfm->crt_flags |= crypto_sync_skcipher_get_flags(xts_ctx->fallback) &
CRYPTO_TFM_RES_MASK;
return ret;
@ -472,10 +473,10 @@ static int xts_fallback_decrypt(struct blkcipher_desc *desc,
{
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
skcipher_request_set_tfm(req, xts_ctx->fallback);
skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
@ -491,10 +492,10 @@ static int xts_fallback_encrypt(struct blkcipher_desc *desc,
{
struct crypto_blkcipher *tfm = desc->tfm;
struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
unsigned int ret;
skcipher_request_set_tfm(req, xts_ctx->fallback);
skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
@ -611,8 +612,7 @@ static int xts_fallback_init(struct crypto_tfm *tfm)
const char *name = tfm->__crt_alg->cra_name;
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
CRYPTO_ALG_ASYNC |
xts_ctx->fallback = crypto_alloc_sync_skcipher(name, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(xts_ctx->fallback)) {
@ -627,7 +627,7 @@ static void xts_fallback_exit(struct crypto_tfm *tfm)
{
struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
crypto_free_skcipher(xts_ctx->fallback);
crypto_free_sync_skcipher(xts_ctx->fallback);
}
static struct crypto_alg xts_aes_alg = {