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authorGilad Ben-Yossef <gilad@benyossef.com>2019-04-18 16:39:04 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-04-25 15:38:15 +0800
commit874e163759f27e0a9988c5d1f4605e3f25564fd2 (patch)
tree80fd12e933b85b1606b6db02795cec35d8f90bee /drivers
parent18dd574acdb70c9c5bc3878d4e98be88259a2fe3 (diff)
downloadlinux-874e163759f27e0a9988c5d1f4605e3f25564fd2.tar.bz2
crypto: ccree - don't map MAC key on stack
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/crypto/ccree/cc_hash.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/crypto/ccree/cc_hash.c b/drivers/crypto/ccree/cc_hash.c
index 36e9fb4141f8..a6abe4e3bb0e 100644
--- 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 */
@@ -742,13 +743,20 @@ static int cc_hash_setkey(struct crypto_ahash *ahash, const u8 *key,
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",
@@ -899,6 +907,9 @@ 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;
}
@@ -925,11 +936,16 @@ static int cc_xcbc_setkey(struct crypto_ahash *ahash,
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",
@@ -981,6 +997,8 @@ static int cc_xcbc_setkey(struct crypto_ahash *ahash,
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;
}