Re: [dm-devel] [PATCH 2/2] hisilicon-crypto: don't sleep of CRYPTO_TFM_REQ_MAY_SLEEP was not specified

Jonathan Cameron
2020-06-17T14:12:21Z

On Wed, 17 Jun 2020 09:49:52 -0400
Mikulas Patocka <mpatocka@redhat.com> wrote:

> There is this call chain:
> sec_alg_skcipher_encrypt -> sec_alg_skcipher_crypto ->
> sec_alg_alloc_and_calc_split_sizes -> kcalloc
> where we call sleeping allocator function even if CRYPTO_TFM_REQ_MAY_SLEEP
> was not specified.
>
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
> Cc: stable@vger.kernel.org # v4.19+
> Fixes: 915e4e8413da ("crypto: hisilicon - SEC security accelerator driver")

I don't have a board to hand today to check this, but doesn't seem like it
will cause any problems.

Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

>
> ---
> drivers/crypto/hisilicon/sec/sec_algs.c | 34 ++++++++++++++++----------------
> 1 file changed, 18 insertions(+), 16 deletions(-)
>
> Index: linux-2.6/drivers/crypto/hisilicon/sec/sec_algs.c
> ===================================================================
> --- linux-2.6.orig/drivers/crypto/hisilicon/sec/sec_algs.c
> +++ linux-2.6/drivers/crypto/hisilicon/sec/sec_algs.c
> @@ -175,7 +175,8 @@ static int sec_alloc_and_fill_hw_sgl(str
> dma_addr_t *psec_sgl,
> struct scatterlist *sgl,
> int count,
> - struct sec_dev_info *info)
> + struct sec_dev_info *info,
> + gfp_t gfp)
> {
> struct sec_hw_sgl *sgl_current = NULL;
> struct sec_hw_sgl *sgl_next;
> @@ -190,7 +191,7 @@ static int sec_alloc_and_fill_hw_sgl(str
> sge_index = i % SEC_MAX_SGE_NUM;
> if (sge_index == 0) {
> sgl_next = dma_pool_zalloc(info->hw_sgl_pool,
> - GFP_KERNEL, &sgl_next_dma);
> + gfp, &sgl_next_dma);
> if (!sgl_next) {
> ret = -ENOMEM;
> goto err_free_hw_sgls;
> @@ -545,14 +546,14 @@ void sec_alg_callback(struct sec_bd_info
> }
>
> static int sec_alg_alloc_and_calc_split_sizes(int length, size_t **split_sizes,
> - int *steps)
> + int *steps, gfp_t gfp)
> {
> size_t *sizes;
> int i;
>
> /* Split into suitable sized blocks */
> *steps = roundup(length, SEC_REQ_LIMIT) / SEC_REQ_LIMIT;
> - sizes = kcalloc(*steps, sizeof(*sizes), GFP_KERNEL);
> + sizes = kcalloc(*steps, sizeof(*sizes), gfp);
> if (!sizes)
> return -ENOMEM;
>
> @@ -568,7 +569,7 @@ static int sec_map_and_split_sg(struct s
> int steps, struct scatterlist ***splits,
> int **splits_nents,
> int sgl_len_in,
> - struct device *dev)
> + struct device *dev, gfp_t gfp)
> {
> int ret, count;
>
> @@ -576,12 +577,12 @@ static int sec_map_and_split_sg(struct s
> if (!count)
> return -EINVAL;
>
> - *splits = kcalloc(steps, sizeof(struct scatterlist *), GFP_KERNEL);
> + *splits = kcalloc(steps, sizeof(struct scatterlist *), gfp);
> if (!*splits) {
> ret = -ENOMEM;
> goto err_unmap_sg;
> }
> - *splits_nents = kcalloc(steps, sizeof(int), GFP_KERNEL);
> + *splits_nents = kcalloc(steps, sizeof(int), gfp);
> if (!*splits_nents) {
> ret = -ENOMEM;
> goto err_free_splits;
> @@ -589,7 +590,7 @@ static int sec_map_and_split_sg(struct s
>
> /* output the scatter list before and after this */
> ret = sg_split(sgl, count, 0, steps, split_sizes,
> - *splits, *splits_nents, GFP_KERNEL);
> + *splits, *splits_nents, gfp);
> if (ret) {
> ret = -ENOMEM;
> goto err_free_splits_nents;
> @@ -630,13 +631,13 @@ static struct sec_request_el
> int el_size, bool different_dest,
> struct scatterlist *sgl_in, int n_ents_in,
> struct scatterlist *sgl_out, int n_ents_out,
> - struct sec_dev_info *info)
> + struct sec_dev_info *info, gfp_t gfp)
> {
> struct sec_request_el *el;
> struct sec_bd_info *req;
> int ret;
>
> - el = kzalloc(sizeof(*el), GFP_KERNEL);
> + el = kzalloc(sizeof(*el), gfp);
> if (!el)
> return ERR_PTR(-ENOMEM);
> el->el_length = el_size;
> @@ -668,7 +669,7 @@ static struct sec_request_el
> el->sgl_in = sgl_in;
>
> ret = sec_alloc_and_fill_hw_sgl(&el->in, &el->dma_in, el->sgl_in,
> - n_ents_in, info);
> + n_ents_in, info, gfp);
> if (ret)
> goto err_free_el;
>
> @@ -679,7 +680,7 @@ static struct sec_request_el
> el->sgl_out = sgl_out;
> ret = sec_alloc_and_fill_hw_sgl(&el->out, &el->dma_out,
> el->sgl_out,
> - n_ents_out, info);
> + n_ents_out, info, gfp);
> if (ret)
> goto err_free_hw_sgl_in;
>
> @@ -720,6 +721,7 @@ static int sec_alg_skcipher_crypto(struc
> int *splits_out_nents = NULL;
> struct sec_request_el *el, *temp;
> bool split = skreq->src != skreq->dst;
> + gfp_t gfp = skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL : GFP_ATOMIC;
>
> mutex_init(&sec_req->lock);
> sec_req->req_base = &skreq->base;
> @@ -728,13 +730,13 @@ static int sec_alg_skcipher_crypto(struc
> sec_req->len_in = sg_nents(skreq->src);
>
> ret = sec_alg_alloc_and_calc_split_sizes(skreq->cryptlen, &split_sizes,
> - &steps);
> + &steps, gfp);
> if (ret)
> return ret;
> sec_req->num_elements = steps;
> ret = sec_map_and_split_sg(skreq->src, split_sizes, steps, &splits_in,
> &splits_in_nents, sec_req->len_in,
> - info->dev);
> + info->dev, gfp);
> if (ret)
> goto err_free_split_sizes;
>
> @@ -742,7 +744,7 @@ static int sec_alg_skcipher_crypto(struc
> sec_req->len_out = sg_nents(skreq->dst);
> ret = sec_map_and_split_sg(skreq->dst, split_sizes, steps,
> &splits_out, &splits_out_nents,
> - sec_req->len_out, info->dev);
> + sec_req->len_out, info->dev, gfp);
> if (ret)
> goto err_unmap_in_sg;
> }
> @@ -775,7 +777,7 @@ static int sec_alg_skcipher_crypto(struc
> splits_in[i], splits_in_nents[i],
> split ? splits_out[i] : NULL,
> split ? splits_out_nents[i] : 0,
> - info);
> + info, gfp);
> if (IS_ERR(el)) {
> ret = PTR_ERR(el);
> goto err_free_elements;
>
> --
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