The previous limits were estimated locally in a single step
basead on bound values, however it was not correct since
when given certain scatterlist the function nx_build_sg_lists
was consuming more sg entries than allocated causing a
memory corruption and crashes.
This patch removes the old logic and replaces it into nx_sg_build_lists in
order to build a correct nx_sg list using the correct sg_max limit and
bounds.
Signed-off-by: Leonidas S. Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>
---
drivers/crypto/nx/nx-aes-ccm.c | 61 +++++++++++++++++----------------------
1 files changed, 27 insertions(+), 34 deletions(-)
diff --git a/drivers/crypto/nx/nx-aes-ccm.c b/drivers/crypto/nx/nx-aes-ccm.c
index 5ecd4c2..67f8081 100644
--- a/drivers/crypto/nx/nx-aes-ccm.c
+++ b/drivers/crypto/nx/nx-aes-ccm.c
@@ -181,6 +181,7 @@ static int generate_pat(u8 *iv,
unsigned int iauth_len = 0;
u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
int rc;
+ unsigned int max_sg_len;
/* zero the ctr value */
memset(iv + 15 - iv[0], 0, iv[0] + 1);
@@ -248,10 +249,19 @@ static int generate_pat(u8 *iv,
if (!req->assoclen) {
return rc;
} else if (req->assoclen <= 14) {
- nx_insg = nx_build_sg_list(nx_insg, b1, 16, nx_ctx->ap->sglen);
- nx_outsg = nx_build_sg_list(nx_outsg, tmp, 16,
+ unsigned int len = 16;
+
+ nx_insg = nx_build_sg_list(nx_insg, b1, &len, nx_ctx->ap->sglen);
+
+ if (len != 16)
+ return -EINVAL;
+
+ nx_outsg = nx_build_sg_list(nx_outsg, tmp, &len,
nx_ctx->ap->sglen);
+ if (len != 16)
+ return -EINVAL;
+
/* inlen should be negative, indicating to phyp that its a
* pointer to an sg list */
nx_ctx->op.inlen = (nx_ctx->in_sg - nx_insg) *
@@ -273,21 +283,24 @@ static int generate_pat(u8 *iv,
atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
} else {
- u32 max_sg_len;
unsigned int processed = 0, to_process;
- /* page_limit: number of sg entries that fit on one page */
- max_sg_len = min_t(u32,
- nx_driver.of.max_sg_len/sizeof(struct nx_sg),
- nx_ctx->ap->sglen);
-
processed += iauth_len;
+ /* page_limit: number of sg entries that fit on one page */
+ max_sg_len = min_t(u64, nx_ctx->ap->sglen,
+ nx_driver.of.max_sg_len/sizeof(struct nx_sg));
+ max_sg_len = min_t(u64, max_sg_len,
+ nx_ctx->ap->databytelen/NX_PAGE_SIZE);
+
do {
to_process = min_t(u32, req->assoclen - processed,
nx_ctx->ap->databytelen);
- to_process = min_t(u64, to_process,
- NX_PAGE_SIZE * (max_sg_len - 1));
+
+ nx_insg = nx_walk_and_build(nx_ctx->in_sg,
+ nx_ctx->ap->sglen,
+ req->assoc, processed,
+ &to_process);
if ((to_process + processed) < req->assoclen) {
NX_CPB_FDM(nx_ctx->csbcpb_aead) |=
@@ -297,10 +310,6 @@ static int generate_pat(u8 *iv,
~NX_FDM_INTERMEDIATE;
}
- nx_insg = nx_walk_and_build(nx_ctx->in_sg,
- nx_ctx->ap->sglen,
- req->assoc, processed,
- to_process);
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
sizeof(struct nx_sg);
@@ -343,7 +352,6 @@ static int ccm_nx_decrypt(struct aead_request *req,
struct nx_ccm_priv *priv = &nx_ctx->priv.ccm;
unsigned long irq_flags;
unsigned int processed = 0, to_process;
- u32 max_sg_len;
int rc = -1;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
@@ -360,19 +368,12 @@ static int ccm_nx_decrypt(struct aead_request *req,
if (rc)
goto out;
- /* page_limit: number of sg entries that fit on one page */
- max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
- nx_ctx->ap->sglen);
-
do {
/* to_process: the AES_BLOCK_SIZE data chunk to process in this
* update. This value is bound by sg list limits.
*/
- to_process = min_t(u64, nbytes - processed,
- nx_ctx->ap->databytelen);
- to_process = min_t(u64, to_process,
- NX_PAGE_SIZE * (max_sg_len - 1));
+ to_process = nbytes - processed;
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
@@ -382,7 +383,7 @@ static int ccm_nx_decrypt(struct aead_request *req,
NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
- to_process, processed,
+ &to_process, processed,
csbcpb->cpb.aes_ccm.iv_or_ctr);
if (rc)
goto out;
@@ -427,7 +428,6 @@ static int ccm_nx_encrypt(struct aead_request *req,
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(req));
unsigned long irq_flags;
unsigned int processed = 0, to_process;
- u32 max_sg_len;
int rc = -1;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
@@ -437,18 +437,11 @@ static int ccm_nx_encrypt(struct aead_request *req,
if (rc)
goto out;
- /* page_limit: number of sg entries that fit on one page */
- max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
- nx_ctx->ap->sglen);
-
do {
/* to process: the AES_BLOCK_SIZE data chunk to process in this
* update. This value is bound by sg list limits.
*/
- to_process = min_t(u64, nbytes - processed,
- nx_ctx->ap->databytelen);
- to_process = min_t(u64, to_process,
- NX_PAGE_SIZE * (max_sg_len - 1));
+ to_process = nbytes - processed;
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
@@ -458,7 +451,7 @@ static int ccm_nx_encrypt(struct aead_request *req,
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
- to_process, processed,
+ &to_process, processed,
csbcpb->cpb.aes_ccm.iv_or_ctr);
if (rc)
goto out;
--
1.7.1
--
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