The hardware does not handle 0 size length request, let's add a
fallback.
Furthermore fallback will be used for all unaligned case the hardware
cannot handle.
Fixes: ce0183cb6464b ("crypto: rockchip - switch to skcipher API")
Signed-off-by: Corentin Labbe <[email protected]>
---
drivers/crypto/rockchip/rk3288_crypto.h | 2 +
.../crypto/rockchip/rk3288_crypto_skcipher.c | 97 ++++++++++++++++---
2 files changed, 86 insertions(+), 13 deletions(-)
diff --git a/drivers/crypto/rockchip/rk3288_crypto.h b/drivers/crypto/rockchip/rk3288_crypto.h
index c919d9a43a08..8b1e15d8ddc6 100644
--- a/drivers/crypto/rockchip/rk3288_crypto.h
+++ b/drivers/crypto/rockchip/rk3288_crypto.h
@@ -246,10 +246,12 @@ struct rk_cipher_ctx {
struct rk_crypto_info *dev;
unsigned int keylen;
u8 iv[AES_BLOCK_SIZE];
+ struct crypto_skcipher *fallback_tfm;
};
struct rk_cipher_rctx {
u32 mode;
+ struct skcipher_request fallback_req; // keep at the end
};
enum alg_type {
diff --git a/drivers/crypto/rockchip/rk3288_crypto_skcipher.c b/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
index bbd0bf52bf07..bf9d398cc54c 100644
--- a/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
+++ b/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
@@ -13,6 +13,63 @@
#define RK_CRYPTO_DEC BIT(0)
+static int rk_cipher_need_fallback(struct skcipher_request *req)
+{
+ struct scatterlist *sgs, *sgd;
+
+ if (!req->cryptlen)
+ return true;
+
+ sgs = req->src;
+ while (sgs) {
+ if (!IS_ALIGNED(sgs->offset, sizeof(u32))) {
+ return true;
+ }
+ if (sgs->length % 16) {
+ return true;
+ }
+ sgs = sg_next(sgs);
+ }
+ sgd = req->dst;
+ while (sgd) {
+ if (!IS_ALIGNED(sgd->offset, sizeof(u32))) {
+ return true;
+ }
+ if (sgd->length % 16) {
+ return true;
+ }
+ sgd = sg_next(sgd);
+ }
+ sgs = req->src;
+ sgd = req->dst;
+ while (sgs && sgd) {
+ if (sgs->length != sgd->length)
+ return true;
+ sgs = sg_next(sgs);
+ sgd = sg_next(sgd);
+ }
+ return false;
+}
+
+static int rk_cipher_fallback(struct skcipher_request *areq)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
+ struct rk_cipher_ctx *op = crypto_skcipher_ctx(tfm);
+ struct rk_cipher_rctx *rctx = skcipher_request_ctx(areq);
+ int err;
+
+ skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
+ skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
+ areq->base.complete, areq->base.data);
+ skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
+ areq->cryptlen, areq->iv);
+ if (rctx->mode & RK_CRYPTO_DEC)
+ err = crypto_skcipher_decrypt(&rctx->fallback_req);
+ else
+ err = crypto_skcipher_encrypt(&rctx->fallback_req);
+ return err;
+}
+
static void rk_crypto_complete(struct crypto_async_request *base, int err)
{
if (base->complete)
@@ -22,10 +79,10 @@ static void rk_crypto_complete(struct crypto_async_request *base, int err)
static int rk_handle_req(struct rk_crypto_info *dev,
struct skcipher_request *req)
{
- if (!IS_ALIGNED(req->cryptlen, dev->align_size))
- return -EINVAL;
- else
- return dev->enqueue(dev, &req->base);
+ if (rk_cipher_need_fallback(req))
+ return rk_cipher_fallback(req);
+
+ return dev->enqueue(dev, &req->base);
}
static int rk_aes_setkey(struct crypto_skcipher *cipher,
@@ -39,7 +96,8 @@ static int rk_aes_setkey(struct crypto_skcipher *cipher,
return -EINVAL;
ctx->keylen = keylen;
memcpy_toio(ctx->dev->reg + RK_CRYPTO_AES_KEY_0, key, keylen);
- return 0;
+
+ return crypto_skcipher_setkey(ctx->fallback_tfm, key, keylen);
}
static int rk_des_setkey(struct crypto_skcipher *cipher,
@@ -54,7 +112,8 @@ static int rk_des_setkey(struct crypto_skcipher *cipher,
ctx->keylen = keylen;
memcpy_toio(ctx->dev->reg + RK_CRYPTO_TDES_KEY1_0, key, keylen);
- return 0;
+
+ return crypto_skcipher_setkey(ctx->fallback_tfm, key, keylen);
}
static int rk_tdes_setkey(struct crypto_skcipher *cipher,
@@ -69,7 +128,7 @@ static int rk_tdes_setkey(struct crypto_skcipher *cipher,
ctx->keylen = keylen;
memcpy_toio(ctx->dev->reg + RK_CRYPTO_TDES_KEY1_0, key, keylen);
- return 0;
+ return crypto_skcipher_setkey(ctx->fallback_tfm, key, keylen);
}
static int rk_aes_ecb_encrypt(struct skcipher_request *req)
@@ -394,6 +453,7 @@ static int rk_ablk_init_tfm(struct crypto_skcipher *tfm)
{
struct rk_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+ const char *name = crypto_tfm_alg_name(&tfm->base);
struct rk_crypto_tmp *algt;
algt = container_of(alg, struct rk_crypto_tmp, alg.skcipher);
@@ -407,6 +467,16 @@ static int rk_ablk_init_tfm(struct crypto_skcipher *tfm)
if (!ctx->dev->addr_vir)
return -ENOMEM;
+ ctx->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(ctx->fallback_tfm)) {
+ dev_err(ctx->dev->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
+ name, PTR_ERR(ctx->fallback_tfm));
+ return PTR_ERR(ctx->fallback_tfm);
+ }
+
+ tfm->reqsize = sizeof(struct rk_cipher_rctx) +
+ crypto_skcipher_reqsize(ctx->fallback_tfm);
+
return 0;
}
@@ -415,6 +485,7 @@ static void rk_ablk_exit_tfm(struct crypto_skcipher *tfm)
struct rk_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
free_page((unsigned long)ctx->dev->addr_vir);
+ crypto_free_skcipher(ctx->fallback_tfm);
}
struct rk_crypto_tmp rk_ecb_aes_alg = {
@@ -423,7 +494,7 @@ struct rk_crypto_tmp rk_ecb_aes_alg = {
.base.cra_name = "ecb(aes)",
.base.cra_driver_name = "ecb-aes-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x0f,
@@ -445,7 +516,7 @@ struct rk_crypto_tmp rk_cbc_aes_alg = {
.base.cra_name = "cbc(aes)",
.base.cra_driver_name = "cbc-aes-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x0f,
@@ -468,7 +539,7 @@ struct rk_crypto_tmp rk_ecb_des_alg = {
.base.cra_name = "ecb(des)",
.base.cra_driver_name = "ecb-des-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x07,
@@ -490,7 +561,7 @@ struct rk_crypto_tmp rk_cbc_des_alg = {
.base.cra_name = "cbc(des)",
.base.cra_driver_name = "cbc-des-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x07,
@@ -513,7 +584,7 @@ struct rk_crypto_tmp rk_ecb_des3_ede_alg = {
.base.cra_name = "ecb(des3_ede)",
.base.cra_driver_name = "ecb-des3-ede-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x07,
@@ -535,7 +606,7 @@ struct rk_crypto_tmp rk_cbc_des3_ede_alg = {
.base.cra_name = "cbc(des3_ede)",
.base.cra_driver_name = "cbc-des3-ede-rk",
.base.cra_priority = 300,
- .base.cra_flags = CRYPTO_ALG_ASYNC,
+ .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
.base.cra_blocksize = DES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct rk_cipher_ctx),
.base.cra_alignmask = 0x07,
--
2.34.1
On Wed, Mar 02, 2022 at 09:11:01PM +0000, Corentin Labbe wrote:
> The hardware does not handle 0 size length request, let's add a
> fallback.
> Furthermore fallback will be used for all unaligned case the hardware
> cannot handle.
>
> Fixes: ce0183cb6464b ("crypto: rockchip - switch to skcipher API")
> Signed-off-by: Corentin Labbe <[email protected]>
> ---
> drivers/crypto/rockchip/rk3288_crypto.h | 2 +
> .../crypto/rockchip/rk3288_crypto_skcipher.c | 97 ++++++++++++++++---
> 2 files changed, 86 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/crypto/rockchip/rk3288_crypto.h b/drivers/crypto/rockchip/rk3288_crypto.h
> index c919d9a43a08..8b1e15d8ddc6 100644
> --- a/drivers/crypto/rockchip/rk3288_crypto.h
> +++ b/drivers/crypto/rockchip/rk3288_crypto.h
> @@ -246,10 +246,12 @@ struct rk_cipher_ctx {
> struct rk_crypto_info *dev;
> unsigned int keylen;
> u8 iv[AES_BLOCK_SIZE];
> + struct crypto_skcipher *fallback_tfm;
> };
>
> struct rk_cipher_rctx {
> u32 mode;
> + struct skcipher_request fallback_req; // keep at the end
> };
>
> enum alg_type {
> diff --git a/drivers/crypto/rockchip/rk3288_crypto_skcipher.c b/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
> index bbd0bf52bf07..bf9d398cc54c 100644
> --- a/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
> +++ b/drivers/crypto/rockchip/rk3288_crypto_skcipher.c
> @@ -13,6 +13,63 @@
>
> #define RK_CRYPTO_DEC BIT(0)
>
> +static int rk_cipher_need_fallback(struct skcipher_request *req)
> +{
> + struct scatterlist *sgs, *sgd;
> +
> + if (!req->cryptlen)
> + return true;
> +
> + sgs = req->src;
> + while (sgs) {
> + if (!IS_ALIGNED(sgs->offset, sizeof(u32))) {
> + return true;
> + }
> + if (sgs->length % 16) {
Can this be relaxed to check for alignment to 4 rather than 16? That's
the requirement for programming the registers.
But I think this check is wrong in general as it doesn't account for
cryptlen; with fscrypt I'm seeing sgs->length == 255 but cryptlen == 16
so the hardware can be used but at the moment the fallback path is
triggered.