From: Christophe Leroy christophe.leroy@c-s.fr
commit 58cdbc6d2263beb36954408522762bbe73169306 upstream.
On SEC1, hash provides wrong result when performing hashing in several steps with input data SG list has more than one element. This was detected with CONFIG_CRYPTO_MANAGER_EXTRA_TESTS:
[ 44.185947] alg: hash: md5-talitos test failed (wrong result) on test vector 6, cfg="random: may_sleep use_finup src_divs=[<reimport>25.88%@+8063, <flush>24.19%@+9588, 28.63%@+16333, <reimport>4.60%@+6756, 16.70%@+16281] dst_divs=[71.61%@alignmask+16361, 14.36%@+7756, 14.3%@+" [ 44.325122] alg: hash: sha1-talitos test failed (wrong result) on test vector 3, cfg="random: inplace use_final src_divs=[<flush,nosimd>16.56%@+16378, <reimport>52.0%@+16329, 21.42%@alignmask+16380, 10.2%@alignmask+16380] iv_offset=39" [ 44.493500] alg: hash: sha224-talitos test failed (wrong result) on test vector 4, cfg="random: use_final nosimd src_divs=[<reimport>52.27%@+7401, <reimport>17.34%@+16285, <flush>17.71%@+26, 12.68%@+10644] iv_offset=43" [ 44.673262] alg: hash: sha256-talitos test failed (wrong result) on test vector 4, cfg="random: may_sleep use_finup src_divs=[<reimport>60.6%@+12790, 17.86%@+1329, <reimport>12.64%@alignmask+16300, 8.29%@+15, 0.40%@+13506, <reimport>0.51%@+16322, <reimport>0.24%@+16339] dst_divs"
This is due to two issues: - We have an overlap between the buffer used for copying the input data (SEC1 doesn't do scatter/gather) and the chained descriptor. - Data copy is wrong when the previous hash left less than one blocksize of data to hash, implying a complement of the previous block with a few bytes from the new request.
Fix it by: - Moving the second descriptor after the buffer, as moving the buffer after the descriptor would make it more complex for other cipher operations (AEAD, ABLKCIPHER) - Skip the bytes taken from the new request to complete the previous one by moving the SG list forward.
Fixes: 37b5e8897eb5 ("crypto: talitos - chain in buffered data for ahash on SEC1") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy christophe.leroy@c-s.fr Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/crypto/talitos.c | 69 +++++++++++++++++++++++++++-------------------- 1 file changed, 41 insertions(+), 28 deletions(-)
--- a/drivers/crypto/talitos.c +++ b/drivers/crypto/talitos.c @@ -334,6 +334,21 @@ int talitos_submit(struct device *dev, i } EXPORT_SYMBOL(talitos_submit);
+static __be32 get_request_hdr(struct talitos_request *request, bool is_sec1) +{ + struct talitos_edesc *edesc; + + if (!is_sec1) + return request->desc->hdr; + + if (!request->desc->next_desc) + return request->desc->hdr1; + + edesc = container_of(request->desc, struct talitos_edesc, desc); + + return ((struct talitos_desc *)(edesc->buf + edesc->dma_len))->hdr1; +} + /* * process what was done, notify callback of error if not */ @@ -355,12 +370,7 @@ static void flush_channel(struct device
/* descriptors with their done bits set don't get the error */ rmb(); - if (!is_sec1) - hdr = request->desc->hdr; - else if (request->desc->next_desc) - hdr = (request->desc + 1)->hdr1; - else - hdr = request->desc->hdr1; + hdr = get_request_hdr(request, is_sec1);
if ((hdr & DESC_HDR_DONE) == DESC_HDR_DONE) status = 0; @@ -490,8 +500,14 @@ static u32 current_desc_hdr(struct devic } }
- if (priv->chan[ch].fifo[iter].desc->next_desc == cur_desc) - return (priv->chan[ch].fifo[iter].desc + 1)->hdr; + if (priv->chan[ch].fifo[iter].desc->next_desc == cur_desc) { + struct talitos_edesc *edesc; + + edesc = container_of(priv->chan[ch].fifo[iter].desc, + struct talitos_edesc, desc); + return ((struct talitos_desc *) + (edesc->buf + edesc->dma_len))->hdr; + }
return priv->chan[ch].fifo[iter].desc->hdr; } @@ -1431,15 +1447,11 @@ static struct talitos_edesc *talitos_ede edesc->dst_nents = dst_nents; edesc->iv_dma = iv_dma; edesc->dma_len = dma_len; - if (dma_len) { - void *addr = &edesc->link_tbl[0]; - - if (is_sec1 && !dst) - addr += sizeof(struct talitos_desc); - edesc->dma_link_tbl = dma_map_single(dev, addr, + if (dma_len) + edesc->dma_link_tbl = dma_map_single(dev, &edesc->link_tbl[0], edesc->dma_len, DMA_BIDIRECTIONAL); - } + return edesc; }
@@ -1706,14 +1718,16 @@ static void common_nonsnoop_hash_unmap(s struct talitos_private *priv = dev_get_drvdata(dev); bool is_sec1 = has_ftr_sec1(priv); struct talitos_desc *desc = &edesc->desc; - struct talitos_desc *desc2 = desc + 1; + struct talitos_desc *desc2 = (struct talitos_desc *) + (edesc->buf + edesc->dma_len);
unmap_single_talitos_ptr(dev, &edesc->desc.ptr[5], DMA_FROM_DEVICE); if (desc->next_desc && desc->ptr[5].ptr != desc2->ptr[5].ptr) unmap_single_talitos_ptr(dev, &desc2->ptr[5], DMA_FROM_DEVICE);
- talitos_sg_unmap(dev, edesc, req_ctx->psrc, NULL, 0, 0); + if (req_ctx->psrc) + talitos_sg_unmap(dev, edesc, req_ctx->psrc, NULL, 0, 0);
/* When using hashctx-in, must unmap it. */ if (from_talitos_ptr_len(&edesc->desc.ptr[1], is_sec1)) @@ -1780,7 +1794,6 @@ static void talitos_handle_buggy_hash(st
static int common_nonsnoop_hash(struct talitos_edesc *edesc, struct ahash_request *areq, unsigned int length, - unsigned int offset, void (*callback) (struct device *dev, struct talitos_desc *desc, void *context, int error)) @@ -1819,9 +1832,7 @@ static int common_nonsnoop_hash(struct t
sg_count = edesc->src_nents ?: 1; if (is_sec1 && sg_count > 1) - sg_pcopy_to_buffer(req_ctx->psrc, sg_count, - edesc->buf + sizeof(struct talitos_desc), - length, req_ctx->nbuf); + sg_copy_to_buffer(req_ctx->psrc, sg_count, edesc->buf, length); else if (length) sg_count = dma_map_sg(dev, req_ctx->psrc, sg_count, DMA_TO_DEVICE); @@ -1834,7 +1845,7 @@ static int common_nonsnoop_hash(struct t DMA_TO_DEVICE); } else { sg_count = talitos_sg_map(dev, req_ctx->psrc, length, edesc, - &desc->ptr[3], sg_count, offset, 0); + &desc->ptr[3], sg_count, 0, 0); if (sg_count > 1) sync_needed = true; } @@ -1858,7 +1869,8 @@ static int common_nonsnoop_hash(struct t talitos_handle_buggy_hash(ctx, edesc, &desc->ptr[3]);
if (is_sec1 && req_ctx->nbuf && length) { - struct talitos_desc *desc2 = desc + 1; + struct talitos_desc *desc2 = (struct talitos_desc *) + (edesc->buf + edesc->dma_len); dma_addr_t next_desc;
memset(desc2, 0, sizeof(*desc2)); @@ -1879,7 +1891,7 @@ static int common_nonsnoop_hash(struct t DMA_TO_DEVICE); copy_talitos_ptr(&desc2->ptr[2], &desc->ptr[2], is_sec1); sg_count = talitos_sg_map(dev, req_ctx->psrc, length, edesc, - &desc2->ptr[3], sg_count, offset, 0); + &desc2->ptr[3], sg_count, 0, 0); if (sg_count > 1) sync_needed = true; copy_talitos_ptr(&desc2->ptr[5], &desc->ptr[5], is_sec1); @@ -1990,7 +2002,6 @@ static int ahash_process_req(struct ahas struct device *dev = ctx->dev; struct talitos_private *priv = dev_get_drvdata(dev); bool is_sec1 = has_ftr_sec1(priv); - int offset = 0; u8 *ctx_buf = req_ctx->buf[req_ctx->buf_idx];
if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) { @@ -2030,6 +2041,8 @@ static int ahash_process_req(struct ahas sg_chain(req_ctx->bufsl, 2, areq->src); req_ctx->psrc = req_ctx->bufsl; } else if (is_sec1 && req_ctx->nbuf && req_ctx->nbuf < blocksize) { + int offset; + if (nbytes_to_hash > blocksize) offset = blocksize - req_ctx->nbuf; else @@ -2042,7 +2055,8 @@ static int ahash_process_req(struct ahas sg_copy_to_buffer(areq->src, nents, ctx_buf + req_ctx->nbuf, offset); req_ctx->nbuf += offset; - req_ctx->psrc = areq->src; + req_ctx->psrc = scatterwalk_ffwd(req_ctx->bufsl, areq->src, + offset); } else req_ctx->psrc = areq->src;
@@ -2082,8 +2096,7 @@ static int ahash_process_req(struct ahas if (ctx->keylen && (req_ctx->first || req_ctx->last)) edesc->desc.hdr |= DESC_HDR_MODE0_MDEU_HMAC;
- return common_nonsnoop_hash(edesc, areq, nbytes_to_hash, offset, - ahash_done); + return common_nonsnoop_hash(edesc, areq, nbytes_to_hash, ahash_done); }
static int ahash_update(struct ahash_request *areq)