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crypto: talitos - properly handle split ICV. 

The driver assumes that the ICV is as a single piece in the last
element of the scatterlist. This assumption is wrong.

This patch ensures that the ICV is properly handled regardless of
the scatterlist layout.

Fixes: 9c4a79653b ("crypto: talitos - Freescale integrated security engine (SEC) driver")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Christophe Leroy 2019-05-21 13:34:17 +00:00 committed by Herbert Xu
parent 4bbfb83925
commit eae55a586c
1 changed files with 15 additions and 11 deletions
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26
drivers/crypto/talitos.c
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@ -1069,7 +1069,6 @@ static void ipsec_esp_encrypt_done(struct device *dev,
unsigned int authsize = crypto_aead_authsize(authenc);
unsigned int ivsize = crypto_aead_ivsize(authenc);
struct talitos_edesc *edesc;
struct scatterlist *sg;
void *icvdata;
edesc = container_of(desc, struct talitos_edesc, desc);
@ -1083,9 +1082,8 @@ static void ipsec_esp_encrypt_done(struct device *dev,
else
icvdata = &edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
sg = sg_last(areq->dst, edesc->dst_nents);
memcpy((char *)sg_virt(sg) + sg->length - authsize,
icvdata, authsize);
sg_pcopy_from_buffer(areq->dst, edesc->dst_nents ? : 1, icvdata,
authsize, areq->assoclen + areq->cryptlen);
}
dma_unmap_single(dev, edesc->iv_dma, ivsize, DMA_TO_DEVICE);
@ -1103,7 +1101,6 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
struct crypto_aead *authenc = crypto_aead_reqtfm(req);
unsigned int authsize = crypto_aead_authsize(authenc);
struct talitos_edesc *edesc;
struct scatterlist *sg;
char *oicv, *icv;
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
@ -1113,9 +1110,18 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
ipsec_esp_unmap(dev, edesc, req, false);
if (!err) {
char icvdata[SHA512_DIGEST_SIZE];
int nents = edesc->dst_nents ? : 1;
unsigned int len = req->assoclen + req->cryptlen;
/* auth check */
sg = sg_last(req->dst, edesc->dst_nents ? : 1);
icv = (char *)sg_virt(sg) + sg->length - authsize;
if (nents > 1) {
sg_pcopy_to_buffer(req->dst, nents, icvdata, authsize,
len - authsize);
icv = icvdata;
} else {
icv = (char *)sg_virt(req->dst) + len - authsize;
}
if (edesc->dma_len) {
if (is_sec1)
@ -1537,7 +1543,6 @@ static int aead_decrypt(struct aead_request *req)
struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
struct talitos_private *priv = dev_get_drvdata(ctx->dev);
struct talitos_edesc *edesc;
struct scatterlist *sg;
void *icvdata;
/* allocate extended descriptor */
@ -1571,9 +1576,8 @@ static int aead_decrypt(struct aead_request *req)
else
icvdata = &edesc->link_tbl[0];
sg = sg_last(req->src, edesc->src_nents ? : 1);
memcpy(icvdata, (char *)sg_virt(sg) + sg->length - authsize, authsize);
sg_pcopy_to_buffer(req->src, edesc->src_nents ? : 1, icvdata, authsize,
req->assoclen + req->cryptlen - authsize);
return ipsec_esp(edesc, req, false, ipsec_esp_decrypt_swauth_done);
}