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crypto: nx - Moving NX-AES-GCM to be processed logic

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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 replace 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@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Leonidas S. Barbosa 2014-10-28 15:47:48 -02:00 committed by Herbert Xu
parent c7b675de39
commit e13a79acf9
1 changed files with 38 additions and 30 deletions
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68
drivers/crypto/nx/nx-aes-gcm.c
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@ -131,7 +131,7 @@ static int nx_gca(struct nx_crypto_ctx *nx_ctx,
struct nx_sg *nx_sg = nx_ctx->in_sg;
unsigned int nbytes = req->assoclen;
unsigned int processed = 0, to_process;
u32 max_sg_len;
unsigned int max_sg_len;
if (nbytes <= AES_BLOCK_SIZE) {
scatterwalk_start(&walk, req->assoc);
@ -143,8 +143,10 @@ static int nx_gca(struct nx_crypto_ctx *nx_ctx,
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_CONTINUATION;
/* 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),
max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
max_sg_len = min_t(u64, max_sg_len,
nx_ctx->ap->databytelen/NX_PAGE_SIZE);
do {
/*
@ -156,13 +158,14 @@ static int nx_gca(struct nx_crypto_ctx *nx_ctx,
to_process = min_t(u64, to_process,
NX_PAGE_SIZE * (max_sg_len - 1));
nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len,
req->assoc, processed, &to_process);
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb_aead) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_INTERMEDIATE;
nx_sg = 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_sg)
* sizeof(struct nx_sg);
@ -195,7 +198,7 @@ static int gmac(struct aead_request *req, struct blkcipher_desc *desc)
struct nx_sg *nx_sg;
unsigned int nbytes = req->assoclen;
unsigned int processed = 0, to_process;
u32 max_sg_len;
unsigned int max_sg_len;
/* Set GMAC mode */
csbcpb->cpb.hdr.mode = NX_MODE_AES_GMAC;
@ -203,8 +206,10 @@ static int gmac(struct aead_request *req, struct blkcipher_desc *desc)
NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
/* 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),
max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
max_sg_len = min_t(u64, max_sg_len,
nx_ctx->ap->databytelen/NX_PAGE_SIZE);
/* Copy IV */
memcpy(csbcpb->cpb.aes_gcm.iv_or_cnt, desc->info, AES_BLOCK_SIZE);
@ -219,13 +224,14 @@ static int gmac(struct aead_request *req, struct blkcipher_desc *desc)
to_process = min_t(u64, to_process,
NX_PAGE_SIZE * (max_sg_len - 1));
nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len,
req->assoc, processed, &to_process);
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
nx_sg = nx_walk_and_build(nx_ctx->in_sg, nx_ctx->ap->sglen,
req->assoc, processed, to_process);
nx_ctx->op.inlen = (nx_ctx->in_sg - nx_sg)
* sizeof(struct nx_sg);
@ -264,6 +270,7 @@ static int gcm_empty(struct aead_request *req, struct blkcipher_desc *desc,
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
char out[AES_BLOCK_SIZE];
struct nx_sg *in_sg, *out_sg;
int len;
/* For scenarios where the input message is zero length, AES CTR mode
* may be used. Set the source data to be a single block (16B) of all
@ -279,11 +286,22 @@ static int gcm_empty(struct aead_request *req, struct blkcipher_desc *desc,
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
len = AES_BLOCK_SIZE;
/* Encrypt the counter/IV */
in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) desc->info,
AES_BLOCK_SIZE, nx_ctx->ap->sglen);
out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *) out, sizeof(out),
&len, nx_ctx->ap->sglen);
if (len != AES_BLOCK_SIZE)
return -EINVAL;
len = sizeof(out);
out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *) out, &len,
nx_ctx->ap->sglen);
if (len != sizeof(out))
return -EINVAL;
nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
@ -317,7 +335,6 @@ static int gcm_aes_nx_crypt(struct aead_request *req, int enc)
unsigned int nbytes = req->cryptlen;
unsigned int processed = 0, to_process;
unsigned long irq_flags;
u32 max_sg_len;
int rc = -EINVAL;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
@ -354,32 +371,23 @@ static int gcm_aes_nx_crypt(struct aead_request *req, int enc)
nbytes -= crypto_aead_authsize(crypto_aead_reqtfm(req));
}
/* 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 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;
csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
desc.tfm = (struct crypto_blkcipher *) req->base.tfm;
rc = nx_build_sg_lists(nx_ctx, &desc, req->dst,
req->src, &to_process, processed,
csbcpb->cpb.aes_gcm.iv_or_cnt);
if (rc)
goto out;
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
desc.tfm = (struct crypto_blkcipher *) req->base.tfm;
rc = nx_build_sg_lists(nx_ctx, &desc, req->dst,
req->src, to_process, processed,
csbcpb->cpb.aes_gcm.iv_or_cnt);
if (rc)
goto out;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);