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Subject[PATCH 07/18] crypto: talitos - zeroize the descriptor with memset()
Date
This patch zeroize the descriptor at allocation using memset().
This has two advantages:
- It reduces the number of places where data has to be set to 0
- It avoids reading memory and loading the cache with data that
will be entirely replaced.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
drivers/crypto/talitos.c | 19 +------------------
drivers/crypto/talitos.h | 2 --
2 files changed, 1 insertion(+), 20 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index a19b5d0300a9..266e7e626e12 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -75,7 +75,6 @@ static void to_talitos_ptr_len(struct talitos_ptr *ptr, unsigned int len,
bool is_sec1)
{
if (is_sec1) {
- ptr->res = 0;
ptr->len1 = cpu_to_be16(len);
} else {
ptr->len = cpu_to_be16(len);
@@ -118,7 +117,6 @@ static void map_single_talitos_ptr(struct device *dev,

to_talitos_ptr_len(ptr, len, is_sec1);
to_talitos_ptr(ptr, dma_addr, is_sec1);
- to_talitos_ptr_ext_set(ptr, 0, is_sec1);
}

/*
@@ -287,7 +285,6 @@ int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
/* map descriptor and save caller data */
if (is_sec1) {
desc->hdr1 = desc->hdr;
- desc->next_desc = 0;
request->dma_desc = dma_map_single(dev, &desc->hdr1,
TALITOS_DESC_SIZE,
DMA_BIDIRECTIONAL);
@@ -1125,7 +1122,6 @@ int talitos_sg_map(struct device *dev, struct scatterlist *src,
bool is_sec1 = has_ftr_sec1(priv);

to_talitos_ptr_len(ptr, len, is_sec1);
- to_talitos_ptr_ext_set(ptr, 0, is_sec1);

if (sg_count == 1) {
to_talitos_ptr(ptr, sg_dma_address(src) + offset, is_sec1);
@@ -1197,11 +1193,9 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
if (desc->hdr & DESC_HDR_TYPE_IPSEC_ESP) {
to_talitos_ptr(&desc->ptr[2], edesc->iv_dma, is_sec1);
to_talitos_ptr_len(&desc->ptr[2], ivsize, is_sec1);
- to_talitos_ptr_ext_set(&desc->ptr[2], 0, is_sec1);
} else {
to_talitos_ptr(&desc->ptr[3], edesc->iv_dma, is_sec1);
to_talitos_ptr_len(&desc->ptr[3], ivsize, is_sec1);
- to_talitos_ptr_ext_set(&desc->ptr[3], 0, is_sec1);
}

/* cipher key */
@@ -1221,7 +1215,6 @@ static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
* typically 12 for ipsec
*/
to_talitos_ptr_len(&desc->ptr[4], cryptlen, is_sec1);
- to_talitos_ptr_ext_set(&desc->ptr[4], 0, is_sec1);

sg_link_tbl_len = cryptlen;

@@ -1406,6 +1399,7 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
err = ERR_PTR(-ENOMEM);
goto error_sg;
}
+ memset(&edesc->desc, 0, sizeof(edesc->desc));

edesc->src_nents = src_nents;
edesc->dst_nents = dst_nents;
@@ -1481,7 +1475,6 @@ static int aead_decrypt(struct aead_request *req)
DESC_HDR_MODE1_MDEU_CICV;

/* reset integrity check result bits */
- edesc->desc.hdr_lo = 0;

return ipsec_esp(edesc, req, ipsec_esp_decrypt_hwauth_done);
}
@@ -1576,12 +1569,10 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
bool is_sec1 = has_ftr_sec1(priv);

/* first DWORD empty */
- desc->ptr[0] = zero_entry;

/* cipher iv */
to_talitos_ptr(&desc->ptr[1], edesc->iv_dma, is_sec1);
to_talitos_ptr_len(&desc->ptr[1], ivsize, is_sec1);
- to_talitos_ptr_ext_set(&desc->ptr[1], 0, is_sec1);

/* cipher key */
map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
@@ -1620,7 +1611,6 @@ static int common_nonsnoop(struct talitos_edesc *edesc,
DMA_FROM_DEVICE);

/* last DWORD empty */
- desc->ptr[6] = zero_entry;

if (sync_needed)
dma_sync_single_for_device(dev, edesc->dma_link_tbl,
@@ -1766,7 +1756,6 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
int sg_count;

/* first DWORD empty */
- desc->ptr[0] = zero_entry;

/* hash context in */
if (!req_ctx->first || req_ctx->swinit) {
@@ -1775,8 +1764,6 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
(char *)req_ctx->hw_context,
DMA_TO_DEVICE);
req_ctx->swinit = 0;
- } else {
- desc->ptr[1] = zero_entry;
}
/* Indicate next op is not the first. */
req_ctx->first = 0;
@@ -1785,8 +1772,6 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
if (ctx->keylen)
map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
(char *)&ctx->key, DMA_TO_DEVICE);
- else
- desc->ptr[2] = zero_entry;

sg_count = edesc->src_nents ?: 1;
if (is_sec1 && sg_count > 1)
@@ -1803,7 +1788,6 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
sync_needed = true;

/* fifth DWORD empty */
- desc->ptr[4] = zero_entry;

/* hash/HMAC out -or- hash context out */
if (req_ctx->last)
@@ -1816,7 +1800,6 @@ static int common_nonsnoop_hash(struct talitos_edesc *edesc,
req_ctx->hw_context, DMA_FROM_DEVICE);

/* last DWORD empty */
- desc->ptr[6] = zero_entry;

if (is_sec1 && from_talitos_ptr_len(&desc->ptr[3], true) == 0)
talitos_handle_buggy_hash(ctx, edesc, &desc->ptr[3]);
diff --git a/drivers/crypto/talitos.h b/drivers/crypto/talitos.h
index 8dd8f40e2771..6112ff1fc334 100644
--- a/drivers/crypto/talitos.h
+++ b/drivers/crypto/talitos.h
@@ -52,8 +52,6 @@ struct talitos_ptr {
__be32 ptr; /* address */
};

-static const struct talitos_ptr zero_entry;
-
/* descriptor */
struct talitos_desc {
__be32 hdr; /* header high bits */
--
2.13.3
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