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crypto: talitos - fix AEAD processing.

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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: Christophe Leroy <christophe.leroy@c-s.fr>
Fixes: aeb4c132f3 ("crypto: talitos - Convert to new AEAD interface")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Christophe Leroy 2019-05-21 13:34:19 +00:00 • committed by Herbert Xu
parent c9cca7034b
commit e345177ded
2 changed files with 57 additions and 107 deletions
Download patch file Download diff file Expand all files Collapse all files

150
drivers/crypto/talitos.c
View file

@ -1040,8 +1040,8 @@ static void ipsec_esp_unmap(struct device *dev,
DMA_FROM_DEVICE); DMA_FROM_DEVICE);
unmap_single_talitos_ptr(dev, civ_ptr, DMA_TO_DEVICE); unmap_single_talitos_ptr(dev, civ_ptr, DMA_TO_DEVICE);
talitos_sg_unmap(dev, edesc, areq->src, areq->dst, cryptlen, talitos_sg_unmap(dev, edesc, areq->src, areq->dst,
areq->assoclen); cryptlen + authsize, areq->assoclen);
if (edesc->dma_len) if (edesc->dma_len)
dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len, dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
@ -1062,30 +1062,15 @@ static void ipsec_esp_encrypt_done(struct device *dev,
struct talitos_desc *desc, void *context, struct talitos_desc *desc, void *context,
int err) int err)
{ {
struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv);
struct aead_request *areq = context; struct aead_request *areq = context;
struct crypto_aead *authenc = crypto_aead_reqtfm(areq); struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
unsigned int authsize = crypto_aead_authsize(authenc);
unsigned int ivsize = crypto_aead_ivsize(authenc); unsigned int ivsize = crypto_aead_ivsize(authenc);
struct talitos_edesc *edesc; struct talitos_edesc *edesc;
void *icvdata;
edesc = container_of(desc, struct talitos_edesc, desc); edesc = container_of(desc, struct talitos_edesc, desc);
ipsec_esp_unmap(dev, edesc, areq, true); 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); dma_unmap_single(dev, edesc->iv_dma, ivsize, DMA_TO_DEVICE);
kfree(edesc); kfree(edesc);
@ -1102,39 +1087,15 @@ static void ipsec_esp_decrypt_swauth_done(struct device *dev,
unsigned int authsize = crypto_aead_authsize(authenc); unsigned int authsize = crypto_aead_authsize(authenc);
struct talitos_edesc *edesc; struct talitos_edesc *edesc;
char *oicv, *icv; 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); edesc = container_of(desc, struct talitos_edesc, desc);
ipsec_esp_unmap(dev, edesc, req, false); ipsec_esp_unmap(dev, edesc, req, false);
if (!err) { if (!err) {
char icvdata[SHA512_DIGEST_SIZE];
int nents = edesc->dst_nents ? : 1;
unsigned int len = req->assoclen + req->cryptlen;
/* auth check */ /* auth check */
if (nents > 1) { oicv = edesc->buf + edesc->dma_len;
sg_pcopy_to_buffer(req->dst, nents, icvdata, authsize, icv = oicv - 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];
err = crypto_memneq(oicv, icv, authsize) ? -EBADMSG : 0; err = crypto_memneq(oicv, icv, authsize) ? -EBADMSG : 0;
} }
@ -1170,11 +1131,12 @@ static void ipsec_esp_decrypt_hwauth_done(struct device *dev,
* stop at cryptlen bytes * stop at cryptlen bytes
*/ */
static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count, 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) struct talitos_ptr *link_tbl_ptr)
{ {
int n_sg = sg_count; int n_sg = elen ? sg_count + 1 : sg_count;
int count = 0; int count = 0;
int cryptlen = datalen + elen;
while (cryptlen && sg && n_sg--) { while (cryptlen && sg && n_sg--) {
unsigned int len = sg_dma_len(sg); unsigned int len = sg_dma_len(sg);
@ -1189,11 +1151,20 @@ static int sg_to_link_tbl_offset(struct scatterlist *sg, int sg_count,
if (len > cryptlen) if (len > cryptlen)
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, to_talitos_ptr(link_tbl_ptr + count,
sg_dma_address(sg) + offset, len, 0); sg_dma_address(sg) + offset, len, 0);
to_talitos_ptr_ext_set(link_tbl_ptr + count, 0, 0); to_talitos_ptr_ext_set(link_tbl_ptr + count, 0, 0);
count++; count++;
cryptlen -= len; cryptlen -= len;
datalen -= len;
offset = 0; offset = 0;
next: next:
@ -1203,7 +1174,7 @@ next:
/* tag end of link table */ /* tag end of link table */
if (count > 0) if (count > 0)
to_talitos_ptr_ext_set(link_tbl_ptr + count - 1, to_talitos_ptr_ext_set(link_tbl_ptr + count - 1,
DESC_PTR_LNKTBL_RETURN, 0); DESC_PTR_LNKTBL_RET, 0);
return count; return count;
} }
@ -1211,7 +1182,8 @@ next:
static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src, static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
unsigned int len, struct talitos_edesc *edesc, unsigned int len, struct talitos_edesc *edesc,
struct talitos_ptr *ptr, int sg_count, 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); struct talitos_private *priv = dev_get_drvdata(dev);
bool is_sec1 = has_ftr_sec1(priv); bool is_sec1 = has_ftr_sec1(priv);
@ -1221,7 +1193,7 @@ static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
return 1; return 1;
} }
to_talitos_ptr_ext_set(ptr, elen, is_sec1); 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); to_talitos_ptr(ptr, sg_dma_address(src) + offset, len, is_sec1);
return sg_count; return sg_count;
} }
@ -1229,9 +1201,9 @@ static int talitos_sg_map_ext(struct device *dev, struct scatterlist *src,
to_talitos_ptr(ptr, edesc->dma_link_tbl + offset, len, is_sec1); to_talitos_ptr(ptr, edesc->dma_link_tbl + offset, len, is_sec1);
return sg_count; 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]); &edesc->link_tbl[tbl_off]);
if (sg_count == 1) { if (sg_count == 1 && !force) {
/* Only one segment now, so no link tbl needed*/ /* Only one segment now, so no link tbl needed*/
copy_talitos_ptr(ptr, &edesc->link_tbl[tbl_off], is_sec1); copy_talitos_ptr(ptr, &edesc->link_tbl[tbl_off], is_sec1);
return sg_count; return sg_count;
@ -1249,7 +1221,7 @@ static int talitos_sg_map(struct device *dev, struct scatterlist *src,
unsigned int offset, int tbl_off) unsigned int offset, int tbl_off)
{ {
return talitos_sg_map_ext(dev, src, len, edesc, ptr, sg_count, offset, return talitos_sg_map_ext(dev, src, len, edesc, ptr, sg_count, offset,
tbl_off, 0); tbl_off, 0, false);
} }
/* /*
@ -1277,6 +1249,7 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
bool is_ipsec_esp = desc->hdr & DESC_HDR_TYPE_IPSEC_ESP; 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 *civ_ptr = &desc->ptr[is_ipsec_esp ? 2 : 3];
struct talitos_ptr *ckey_ptr = &desc->ptr[is_ipsec_esp ? 3 : 2]; 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 */ /* hmac key */
to_talitos_ptr(&desc->ptr[0], ctx->dma_key, ctx->authkeylen, is_sec1); to_talitos_ptr(&desc->ptr[0], ctx->dma_key, ctx->authkeylen, is_sec1);
@ -1316,7 +1289,8 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
elen = authsize; elen = authsize;
ret = talitos_sg_map_ext(dev, areq->src, cryptlen, edesc, &desc->ptr[4], 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) { if (ret > 1) {
tbl_off += ret; tbl_off += ret;
@ -1330,55 +1304,35 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
dma_map_sg(dev, areq->dst, sg_count, DMA_FROM_DEVICE); dma_map_sg(dev, areq->dst, sg_count, DMA_FROM_DEVICE);
} }
ret = talitos_sg_map(dev, areq->dst, cryptlen, edesc, &desc->ptr[5], if (is_ipsec_esp && encrypt)
sg_count, areq->assoclen, tbl_off); elen = authsize;
else
if (is_ipsec_esp) elen = 0;
to_talitos_ptr_ext_or(&desc->ptr[5], authsize, is_sec1); 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 */ /* ICV data */
if (ret > 1) { edesc->icv_ool = !encrypt;
tbl_off += ret;
edesc->icv_ool = true;
sync_needed = true;
if (is_ipsec_esp) { if (!encrypt && is_ipsec_esp) {
struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off]; struct talitos_ptr *tbl_ptr = &edesc->link_tbl[tbl_off];
int offset = (edesc->src_nents + edesc->dst_nents + 2) *
sizeof(struct talitos_ptr) + authsize;
/* Add an entry to the link table for ICV data */ /* 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 - 1, 0, is_sec1);
to_talitos_ptr_ext_set(tbl_ptr, DESC_PTR_LNKTBL_RETURN, to_talitos_ptr_ext_set(tbl_ptr, DESC_PTR_LNKTBL_RET, is_sec1);
is_sec1);
/* icv data follows link tables */ /* icv data follows link tables */
to_talitos_ptr(tbl_ptr, edesc->dma_link_tbl + offset, to_talitos_ptr(tbl_ptr, dma_icv, authsize, is_sec1);
authsize, is_sec1); to_talitos_ptr_ext_or(&desc->ptr[5], 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);
}
} 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; sync_needed = true;
} else { } else if (!encrypt) {
edesc->icv_ool = false; to_talitos_ptr(&desc->ptr[6], dma_icv, authsize, is_sec1);
} sync_needed = true;
} else { } else if (!is_ipsec_esp) {
edesc->icv_ool = false; talitos_sg_map(dev, areq->dst, authsize, edesc, &desc->ptr[6],
sg_count, areq->assoclen + cryptlen, tbl_off);
} }
/* iv out */ /* iv out */
@ -1461,18 +1415,18 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
* and space for two sets of ICVs (stashed and generated) * and space for two sets of ICVs (stashed and generated)
*/ */
alloc_len = sizeof(struct talitos_edesc); alloc_len = sizeof(struct talitos_edesc);
if (src_nents || dst_nents) { if (src_nents || dst_nents || !encrypt) {
if (is_sec1) if (is_sec1)
dma_len = (src_nents ? src_len : 0) + dma_len = (src_nents ? src_len : 0) +
(dst_nents ? dst_len : 0); (dst_nents ? dst_len : 0) + authsize;
else else
dma_len = (src_nents + dst_nents + 2) * dma_len = (src_nents + dst_nents + 2) *
sizeof(struct talitos_ptr) + authsize * 2; sizeof(struct talitos_ptr) + authsize;
alloc_len += dma_len; alloc_len += dma_len;
} else { } else {
dma_len = 0; 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 its a ahash, add space for a second desc next to the first one */
if (is_sec1 && !dst) if (is_sec1 && !dst)
@ -1570,11 +1524,7 @@ static int aead_decrypt(struct aead_request *req)
edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND; edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
/* stash incoming ICV for later cmp with ICV generated by the h/w */ /* stash incoming ICV for later cmp with ICV generated by the h/w */
if (edesc->dma_len) icvdata = edesc->buf + edesc->dma_len;
icvdata = (char *)&edesc->link_tbl[edesc->src_nents +
edesc->dst_nents + 2];
else
icvdata = &edesc->link_tbl[0];
sg_pcopy_to_buffer(req->src, edesc->src_nents ? : 1, icvdata, authsize, sg_pcopy_to_buffer(req->src, edesc->src_nents ? : 1, icvdata, authsize,
req->assoclen + req->cryptlen - authsize); req->assoclen + req->cryptlen - authsize);

2
drivers/crypto/talitos.h
View file

@ -412,5 +412,5 @@ static inline bool has_ftr_sec1(struct talitos_private *priv)
/* link table extent field bits */ /* link table extent field bits */
#define DESC_PTR_LNKTBL_JUMP 0x80 #define DESC_PTR_LNKTBL_JUMP 0x80
#define DESC_PTR_LNKTBL_RETURN 0x02 #define DESC_PTR_LNKTBL_RET 0x02
#define DESC_PTR_LNKTBL_NEXT 0x01 #define DESC_PTR_LNKTBL_NEXT 0x01