Commit 7f548ace authored by Christophe Leroy's avatar Christophe Leroy Committed by Greg Kroah-Hartman

crypto: talitos - fix AEAD processing.

[ Upstream commit e345177d ]

This driver is working well in 'simple cases', but as soon as
more exotic SG lists are provided (dst different from src,
auth part not in a single SG fragment, ...) there are
wrong results, overruns, etc ...

This patch cleans up the AEAD processing by:
- Simplifying the location of 'out of line' ICV
- Never using 'out of line' ICV on encryp
- Always using 'out of line' ICV on decrypt
- Forcing the generation of a SG table on decrypt
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Fixes: aeb4c132 ("crypto: talitos - Convert to new AEAD interface")
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent d947f064
......@@ -974,8 +974,8 @@ static void ipsec_esp_unmap(struct device *dev,
DMA_FROM_DEVICE);
unmap_single_talitos_ptr(dev, civ_ptr, DMA_TO_DEVICE);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst, cryptlen,
areq->assoclen);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst,
cryptlen + authsize, areq->assoclen);
if (edesc->dma_len)
dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
......@@ -996,30 +996,15 @@ static void ipsec_esp_encrypt_done(struct device *dev,
struct talitos_desc *desc, void *context,
int err)
{
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
struct aead_request *areq = context;
struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
unsigned int authsize = crypto_aead_authsize(authenc);
unsigned int ivsize = crypto_aead_ivsize(authenc);
struct talitos_edesc *edesc;
void *icvdata;
edesc = container_of(desc, struct talitos_edesc, desc);
ipsec_esp_unmap(dev, edesc, areq, true);
/* copy the generated ICV to dst */
if (edesc->icv_ool) {
if (is_sec1)
icvdata = edesc->buf + areq->assoclen + areq->cryptlen;
else
icvdata = &edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
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);
kfree(edesc);
......@@ -1036,39 +1021,15 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
unsigned int authsize = crypto_aead_authsize(authenc);
struct talitos_edesc *edesc;
char *oicv, *icv;
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
edesc = container_of(desc, struct talitos_edesc, desc);
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 */
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)
oicv = (char *)&edesc->dma_link_tbl +
req->assoclen + req->cryptlen;
else
oicv = (char *)
&edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
if (edesc->icv_ool)
icv = oicv + authsize;
} else
oicv = (char *)&edesc->link_tbl[0];
oicv = edesc->buf + edesc->dma_len;
icv = oicv - authsize;
err = crypto_memneq(oicv, icv, authsize) ? -EBADMSG : 0;
}
......@@ -1104,11 +1065,12 @@ static void ipsec_esp_decrypt_hwauth_done(struct device *dev,
* stop at cryptlen bytes
*/
static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
unsigned int offset, int cryptlen,
unsigned int offset, int datalen, int elen,
struct talitos_ptr *link_tbl_ptr)
{
int n_sg = sg_count;
int n_sg = elen ? sg_count + 1 : sg_count;
int count = 0;
int cryptlen = datalen + elen;
while (cryptlen && sg && n_sg--) {
unsigned int len = sg_dma_len(sg);
......@@ -1123,11 +1085,20 @@ static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
if (len > cryptlen)
len = cryptlen;
if (datalen > 0 && len > datalen) {
to_talitos_ptr(link_tbl_ptr + count,
sg_dma_address(sg) + offset, datalen, 0);
to_talitos_ptr_ext_set(link_tbl_ptr + count, 0, 0);
count++;
len -= datalen;
offset += datalen;
}
to_talitos_ptr(link_tbl_ptr + count,
sg_dma_address(sg) + offset, len, 0);
to_talitos_ptr_ext_set(link_tbl_ptr + count, 0, 0);
count++;
cryptlen -= len;
datalen -= len;
offset = 0;
next:
......@@ -1137,7 +1108,7 @@ static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
/* tag end of link table */
if (count > 0)
to_talitos_ptr_ext_set(link_tbl_ptr + count - 1,
DESC_PTR_LNKTBL_RETURN, 0);
DESC_PTR_LNKTBL_RET, 0);
return count;
}
......@@ -1145,7 +1116,8 @@ static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
unsigned int len, struct talitos_edesc *edesc,
struct talitos_ptr *ptr, int sg_count,
unsigned int offset, int tbl_off, int elen)
unsigned int offset, int tbl_off, int elen,
bool force)
{
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
......@@ -1155,7 +1127,7 @@ static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
return 1;
}
to_talitos_ptr_ext_set(ptr, elen, is_sec1);
if (sg_count == 1) {
if (sg_count == 1 && !force) {
to_talitos_ptr(ptr, sg_dma_address(src) + offset, len, is_sec1);
return sg_count;
}
......@@ -1163,9 +1135,9 @@ static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
to_talitos_ptr(ptr, edesc->dma_link_tbl + offset, len, is_sec1);
return sg_count;
}
sg_count = sg_to_link_tbl_offset(src, sg_count, offset, len + elen,
sg_count = sg_to_link_tbl_offset(src, sg_count, offset, len, elen,
&edesc->link_tbl[tbl_off]);
if (sg_count == 1) {
if (sg_count == 1 && !force) {
/* Only one segment now, so no link tbl needed*/
copy_talitos_ptr(ptr, &edesc->link_tbl[tbl_off], is_sec1);
return sg_count;
......@@ -1183,7 +1155,7 @@ static int talitos_sg_map(struct device *dev, struct scatterlist *src,
unsigned int offset, int tbl_off)
{
return talitos_sg_map_ext(dev, src, len, edesc, ptr, sg_count, offset,
tbl_off, 0);
tbl_off, 0, false);
}
/*
......@@ -1211,6 +1183,7 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
bool is_ipsec_esp = desc->hdr & DESC_HDR_TYPE_IPSEC_ESP;
struct talitos_ptr *civ_ptr = &desc->ptr[is_ipsec_esp ? 2 : 3];
struct talitos_ptr *ckey_ptr = &desc->ptr[is_ipsec_esp ? 3 : 2];
dma_addr_t dma_icv = edesc->dma_link_tbl + edesc->dma_len - authsize;
/* hmac key */
to_talitos_ptr(&desc->ptr[0], ctx->dma_key, ctx->authkeylen, is_sec1);
......@@ -1250,7 +1223,8 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
elen = authsize;
ret = talitos_sg_map_ext(dev, areq->src, cryptlen, edesc, &desc->ptr[4],
sg_count, areq->assoclen, tbl_off, elen);
sg_count, areq->assoclen, tbl_off, elen,
false);
if (ret > 1) {
tbl_off += ret;
......@@ -1264,55 +1238,35 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
dma_map_sg(dev, areq->dst, sg_count, DMA_FROM_DEVICE);
}
ret = talitos_sg_map(dev, areq->dst, cryptlen, edesc, &desc->ptr[5],
sg_count, areq->assoclen, tbl_off);
if (is_ipsec_esp)
to_talitos_ptr_ext_or(&desc->ptr[5], authsize, is_sec1);
if (is_ipsec_esp && encrypt)
elen = authsize;
else
elen = 0;
ret = talitos_sg_map_ext(dev, areq->dst, cryptlen, edesc, &desc->ptr[5],
sg_count, areq->assoclen, tbl_off, elen,
is_ipsec_esp && !encrypt);
tbl_off += ret;
/* ICV data */
if (ret > 1) {
tbl_off += ret;
edesc->icv_ool = true;
sync_needed = true;
edesc->icv_ool = !encrypt;
if (is_ipsec_esp) {
struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];
int offset = (edesc->src_nents + edesc->dst_nents + 2) *
sizeof(struct talitos_ptr) + authsize;
if (!encrypt && is_ipsec_esp) {
struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];
/* Add an entry to the link table for ICV data */
to_talitos_ptr_ext_set(tbl_ptr - 1, 0, is_sec1);
to_talitos_ptr_ext_set(tbl_ptr, DESC_PTR_LNKTBL_RETURN,
is_sec1);
/* Add an entry to the link table for ICV data */
to_talitos_ptr_ext_set(tbl_ptr - 1, 0, is_sec1);
to_talitos_ptr_ext_set(tbl_ptr, DESC_PTR_LNKTBL_RET, is_sec1);
/* icv data follows link tables */
to_talitos_ptr(tbl_ptr, edesc->dma_link_tbl + offset,
authsize, is_sec1);
} else {
dma_addr_t addr = edesc->dma_link_tbl;
if (is_sec1)
addr += areq->assoclen + cryptlen;
else
addr += sizeof(struct talitos_ptr) * tbl_off;
to_talitos_ptr(&desc->ptr[6], addr, authsize, is_sec1);
}
/* icv data follows link tables */
to_talitos_ptr(tbl_ptr, dma_icv, authsize, is_sec1);
to_talitos_ptr_ext_or(&desc->ptr[5], authsize, is_sec1);
sync_needed = true;
} else if (!encrypt) {
to_talitos_ptr(&desc->ptr[6], dma_icv, authsize, is_sec1);
sync_needed = true;
} else if (!is_ipsec_esp) {
ret = talitos_sg_map(dev, areq->dst, authsize, edesc,
&desc->ptr[6], sg_count, areq->assoclen +
cryptlen,
tbl_off);
if (ret > 1) {
tbl_off += ret;
edesc->icv_ool = true;
sync_needed = true;
} else {
edesc->icv_ool = false;
}
} else {
edesc->icv_ool = false;
talitos_sg_map(dev, areq->dst, authsize, edesc, &desc->ptr[6],
sg_count, areq->assoclen + cryptlen, tbl_off);
}
/* iv out */
......@@ -1395,18 +1349,18 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
* and space for two sets of ICVs (stashed and generated)
*/
alloc_len = sizeof(struct talitos_edesc);
if (src_nents || dst_nents) {
if (src_nents || dst_nents || !encrypt) {
if (is_sec1)
dma_len = (src_nents ? src_len : 0) +
(dst_nents ? dst_len : 0);
(dst_nents ? dst_len : 0) + authsize;
else
dma_len = (src_nents + dst_nents + 2) *
sizeof(struct talitos_ptr) + authsize * 2;
sizeof(struct talitos_ptr) + authsize;
alloc_len += dma_len;
} else {
dma_len = 0;
alloc_len += icv_stashing ? authsize : 0;
}
alloc_len += icv_stashing ? authsize : 0;
/* if its a ahash, add space for a second desc next to the first one */
if (is_sec1 && !dst)
......@@ -1500,11 +1454,7 @@ static int aead_decrypt(struct aead_request *req)
edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
/* stash incoming ICV for later cmp with ICV generated by the h/w */
if (edesc->dma_len)
icvdata = (char *)&edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
else
icvdata = &edesc->link_tbl[0];
icvdata = edesc->buf + edesc->dma_len;
sg_pcopy_to_buffer(req->src, edesc->src_nents ? : 1, icvdata, authsize,
req->assoclen + req->cryptlen - authsize);
......
......@@ -442,5 +442,5 @@ static inline bool has_ftr_sec1(struct talitos_private *priv)
/* link table extent field bits */
#define DESC_PTR_LNKTBL_JUMP 0x80
#define DESC_PTR_LNKTBL_RETURN 0x02
#define DESC_PTR_LNKTBL_RET 0x02
#define DESC_PTR_LNKTBL_NEXT 0x01
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