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 Cc: Jesper Nilsson <jesper.nilsson@xxxxxxxx> Cc: Lars Persson <lars.persson@xxxxxxxx> Cc: linux-arm-kernel@xxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- drivers/crypto/axis/artpec6_crypto.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/crypto/axis/artpec6_crypto.c b/drivers/crypto/axis/artpec6_crypto.c index 7f07a5085e9b..e5a080e87ea8 100644 --- a/drivers/crypto/axis/artpec6_crypto.c +++ b/drivers/crypto/axis/artpec6_crypto.c @@ -330,7 +330,7 @@ struct artpec6_cryptotfm_context { size_t key_length; u32 key_md; int crypto_type; - struct crypto_skcipher *fallback; + struct crypto_sync_skcipher *fallback; }; struct artpec6_crypto_aead_hw_ctx { @@ -1199,15 +1199,15 @@ artpec6_crypto_ctr_crypt(struct skcipher_request *req, bool encrypt) pr_debug("counter %x will overflow (nblks %u), falling back\n", counter, counter + nblks); - ret = crypto_skcipher_setkey(ctx->fallback, ctx->aes_key, - ctx->key_length); + ret = crypto_sync_skcipher_setkey(ctx->fallback, ctx->aes_key, + ctx->key_length); if (ret) return ret; { - 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, @@ -1561,10 +1561,9 @@ static int artpec6_crypto_aes_ctr_init(struct crypto_skcipher *tfm) { struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm); - ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(&tfm->base), - 0, - CRYPTO_ALG_ASYNC | - CRYPTO_ALG_NEED_FALLBACK); + ctx->fallback = + crypto_alloc_sync_skcipher(crypto_tfm_alg_name(&tfm->base), + 0, CRYPTO_ALG_NEED_FALLBACK); if (IS_ERR(ctx->fallback)) return PTR_ERR(ctx->fallback); @@ -1605,7 +1604,7 @@ static void artpec6_crypto_aes_ctr_exit(struct crypto_skcipher *tfm) { struct artpec6_cryptotfm_context *ctx = crypto_skcipher_ctx(tfm); - crypto_free_skcipher(ctx->fallback); + crypto_free_sync_skcipher(ctx->fallback); artpec6_crypto_aes_exit(tfm); } -- 2.17.1
