From: Gilad Ben-Yossef gilad@benyossef.com
commit 874e163759f27e0a9988c5d1f4605e3f25564fd2 upstream.
The MAC hash key might be passed to us on stack. Copy it to a slab buffer before mapping to gurantee proper DMA mapping.
Signed-off-by: Gilad Ben-Yossef gilad@benyossef.com Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/crypto/ccree/cc_hash.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-)
--- a/drivers/crypto/ccree/cc_hash.c +++ b/drivers/crypto/ccree/cc_hash.c @@ -69,6 +69,7 @@ struct cc_hash_alg { struct hash_key_req_ctx { u32 keylen; dma_addr_t key_dma_addr; + u8 *key; };
/* hash per-session context */ @@ -730,13 +731,20 @@ static int cc_hash_setkey(struct crypto_ ctx->key_params.keylen = keylen; ctx->key_params.key_dma_addr = 0; ctx->is_hmac = true; + ctx->key_params.key = NULL;
if (keylen) { + ctx->key_params.key = kmemdup(key, keylen, GFP_KERNEL); + if (!ctx->key_params.key) + return -ENOMEM; + ctx->key_params.key_dma_addr = - dma_map_single(dev, (void *)key, keylen, DMA_TO_DEVICE); + dma_map_single(dev, (void *)ctx->key_params.key, keylen, + DMA_TO_DEVICE); if (dma_mapping_error(dev, ctx->key_params.key_dma_addr)) { dev_err(dev, "Mapping key va=0x%p len=%u for DMA failed\n", - key, keylen); + ctx->key_params.key, keylen); + kzfree(ctx->key_params.key); return -ENOMEM; } dev_dbg(dev, "mapping key-buffer: key_dma_addr=%pad keylen=%u\n", @@ -887,6 +895,9 @@ out: dev_dbg(dev, "Unmapped key-buffer: key_dma_addr=%pad keylen=%u\n", &ctx->key_params.key_dma_addr, ctx->key_params.keylen); } + + kzfree(ctx->key_params.key); + return rc; }
@@ -913,11 +924,16 @@ static int cc_xcbc_setkey(struct crypto_
ctx->key_params.keylen = keylen;
+ ctx->key_params.key = kmemdup(key, keylen, GFP_KERNEL); + if (!ctx->key_params.key) + return -ENOMEM; + ctx->key_params.key_dma_addr = - dma_map_single(dev, (void *)key, keylen, DMA_TO_DEVICE); + dma_map_single(dev, ctx->key_params.key, keylen, DMA_TO_DEVICE); if (dma_mapping_error(dev, ctx->key_params.key_dma_addr)) { dev_err(dev, "Mapping key va=0x%p len=%u for DMA failed\n", key, keylen); + kzfree(ctx->key_params.key); return -ENOMEM; } dev_dbg(dev, "mapping key-buffer: key_dma_addr=%pad keylen=%u\n", @@ -969,6 +985,8 @@ static int cc_xcbc_setkey(struct crypto_ dev_dbg(dev, "Unmapped key-buffer: key_dma_addr=%pad keylen=%u\n", &ctx->key_params.key_dma_addr, ctx->key_params.keylen);
+ kzfree(ctx->key_params.key); + return rc; }