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Subject[PATCH 5.1 040/128] crypto: caam/qi2 - generate hash keys in-place
Date
From: Horia Geantă <horia.geanta@nxp.com>

commit 418cd20e4dcdca97e6f6d59e6336228dacf2e45d upstream.

Commit 307244452d3d ("crypto: caam - generate hash keys in-place")
fixed ahash implementation in caam/jr driver such that user-provided key
buffer is not DMA mapped, since it's not guaranteed to be DMAable.

Apply a similar fix for caam/qi2 driver.

Cc: <stable@vger.kernel.org> # v4.20+
Fixes: 3f16f6c9d632 ("crypto: caam/qi2 - add support for ahash algorithms")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/caam/caamalg_qi2.c | 41 +++++++++++++-------------------------
1 file changed, 15 insertions(+), 26 deletions(-)

--- a/drivers/crypto/caam/caamalg_qi2.c
+++ b/drivers/crypto/caam/caamalg_qi2.c
@@ -3020,13 +3020,13 @@ static void split_key_sh_done(void *cbk_
}

/* Digest hash size if it is too large */
-static int hash_digest_key(struct caam_hash_ctx *ctx, const u8 *key_in,
- u32 *keylen, u8 *key_out, u32 digestsize)
+static int hash_digest_key(struct caam_hash_ctx *ctx, u32 *keylen, u8 *key,
+ u32 digestsize)
{
struct caam_request *req_ctx;
u32 *desc;
struct split_key_sh_result result;
- dma_addr_t src_dma, dst_dma;
+ dma_addr_t key_dma;
struct caam_flc *flc;
dma_addr_t flc_dma;
int ret = -ENOMEM;
@@ -3043,17 +3043,10 @@ static int hash_digest_key(struct caam_h
if (!flc)
goto err_flc;

- src_dma = dma_map_single(ctx->dev, (void *)key_in, *keylen,
- DMA_TO_DEVICE);
- if (dma_mapping_error(ctx->dev, src_dma)) {
- dev_err(ctx->dev, "unable to map key input memory\n");
- goto err_src_dma;
- }
- dst_dma = dma_map_single(ctx->dev, (void *)key_out, digestsize,
- DMA_FROM_DEVICE);
- if (dma_mapping_error(ctx->dev, dst_dma)) {
- dev_err(ctx->dev, "unable to map key output memory\n");
- goto err_dst_dma;
+ key_dma = dma_map_single(ctx->dev, key, *keylen, DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(ctx->dev, key_dma)) {
+ dev_err(ctx->dev, "unable to map key memory\n");
+ goto err_key_dma;
}

desc = flc->sh_desc;
@@ -3078,14 +3071,14 @@ static int hash_digest_key(struct caam_h

dpaa2_fl_set_final(in_fle, true);
dpaa2_fl_set_format(in_fle, dpaa2_fl_single);
- dpaa2_fl_set_addr(in_fle, src_dma);
+ dpaa2_fl_set_addr(in_fle, key_dma);
dpaa2_fl_set_len(in_fle, *keylen);
dpaa2_fl_set_format(out_fle, dpaa2_fl_single);
- dpaa2_fl_set_addr(out_fle, dst_dma);
+ dpaa2_fl_set_addr(out_fle, key_dma);
dpaa2_fl_set_len(out_fle, digestsize);

print_hex_dump_debug("key_in@" __stringify(__LINE__)": ",
- DUMP_PREFIX_ADDRESS, 16, 4, key_in, *keylen, 1);
+ DUMP_PREFIX_ADDRESS, 16, 4, key, *keylen, 1);
print_hex_dump_debug("shdesc@" __stringify(__LINE__)": ",
DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
1);
@@ -3105,17 +3098,15 @@ static int hash_digest_key(struct caam_h
wait_for_completion(&result.completion);
ret = result.err;
print_hex_dump_debug("digested key@" __stringify(__LINE__)": ",
- DUMP_PREFIX_ADDRESS, 16, 4, key_in,
+ DUMP_PREFIX_ADDRESS, 16, 4, key,
digestsize, 1);
}

dma_unmap_single(ctx->dev, flc_dma, sizeof(flc->flc) + desc_bytes(desc),
DMA_TO_DEVICE);
err_flc_dma:
- dma_unmap_single(ctx->dev, dst_dma, digestsize, DMA_FROM_DEVICE);
-err_dst_dma:
- dma_unmap_single(ctx->dev, src_dma, *keylen, DMA_TO_DEVICE);
-err_src_dma:
+ dma_unmap_single(ctx->dev, key_dma, *keylen, DMA_BIDIRECTIONAL);
+err_key_dma:
kfree(flc);
err_flc:
kfree(req_ctx);
@@ -3137,12 +3128,10 @@ static int ahash_setkey(struct crypto_ah
dev_dbg(ctx->dev, "keylen %d blocksize %d\n", keylen, blocksize);

if (keylen > blocksize) {
- hashed_key = kmalloc_array(digestsize, sizeof(*hashed_key),
- GFP_KERNEL | GFP_DMA);
+ hashed_key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
if (!hashed_key)
return -ENOMEM;
- ret = hash_digest_key(ctx, key, &keylen, hashed_key,
- digestsize);
+ ret = hash_digest_key(ctx, &keylen, hashed_key, digestsize);
if (ret)
goto bad_free_key;
key = hashed_key;

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