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@xxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- drivers/crypto/sahara.c | 31 +++++++++++++++---------------- 1 file changed, 15 insertions(+), 16 deletions(-) diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c index e7540a5b8197..bbf166a97ad3 100644 --- a/drivers/crypto/sahara.c +++ b/drivers/crypto/sahara.c @@ -149,7 +149,7 @@ struct sahara_ctx { /* AES-specific context */ int keylen; u8 key[AES_KEYSIZE_128]; - struct crypto_skcipher *fallback; + struct crypto_sync_skcipher *fallback; }; struct sahara_aes_reqctx { @@ -621,14 +621,14 @@ static int sahara_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, /* * The requested key size is not supported by HW, do a fallback. */ - crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK); - crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags & + crypto_sync_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK); + crypto_sync_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK); - ret = crypto_skcipher_setkey(ctx->fallback, key, keylen); + ret = crypto_sync_skcipher_setkey(ctx->fallback, key, keylen); tfm->base.crt_flags &= ~CRYPTO_TFM_RES_MASK; - tfm->base.crt_flags |= crypto_skcipher_get_flags(ctx->fallback) & + tfm->base.crt_flags |= crypto_sync_skcipher_get_flags(ctx->fallback) & CRYPTO_TFM_RES_MASK; return ret; } @@ -666,9 +666,9 @@ static int sahara_aes_ecb_encrypt(struct ablkcipher_request *req) int err; if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { - SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); + SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); - skcipher_request_set_tfm(subreq, ctx->fallback); + skcipher_request_set_sync_tfm(subreq, ctx->fallback); skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL); skcipher_request_set_crypt(subreq, req->src, req->dst, @@ -688,9 +688,9 @@ static int sahara_aes_ecb_decrypt(struct ablkcipher_request *req) int err; if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { - SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); + SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); - skcipher_request_set_tfm(subreq, ctx->fallback); + skcipher_request_set_sync_tfm(subreq, ctx->fallback); skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL); skcipher_request_set_crypt(subreq, req->src, req->dst, @@ -710,9 +710,9 @@ static int sahara_aes_cbc_encrypt(struct ablkcipher_request *req) int err; if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { - SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); + SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); - skcipher_request_set_tfm(subreq, ctx->fallback); + skcipher_request_set_sync_tfm(subreq, ctx->fallback); skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL); skcipher_request_set_crypt(subreq, req->src, req->dst, @@ -732,9 +732,9 @@ static int sahara_aes_cbc_decrypt(struct ablkcipher_request *req) int err; if (unlikely(ctx->keylen != AES_KEYSIZE_128)) { - SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); + SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback); - skcipher_request_set_tfm(subreq, ctx->fallback); + skcipher_request_set_sync_tfm(subreq, ctx->fallback); skcipher_request_set_callback(subreq, req->base.flags, NULL, NULL); skcipher_request_set_crypt(subreq, req->src, req->dst, @@ -752,8 +752,7 @@ static int sahara_aes_cra_init(struct crypto_tfm *tfm) const char *name = crypto_tfm_alg_name(tfm); struct sahara_ctx *ctx = crypto_tfm_ctx(tfm); - ctx->fallback = crypto_alloc_skcipher(name, 0, - CRYPTO_ALG_ASYNC | + ctx->fallback = crypto_alloc_sync_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(ctx->fallback)) { pr_err("Error allocating fallback algo %s\n", name); @@ -769,7 +768,7 @@ static void sahara_aes_cra_exit(struct crypto_tfm *tfm) { struct sahara_ctx *ctx = crypto_tfm_ctx(tfm); - crypto_free_skcipher(ctx->fallback); + crypto_free_sync_skcipher(ctx->fallback); } static u32 sahara_sha_init_hdr(struct sahara_dev *dev, -- 2.17.1
