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crypto: nx - fix limits to sg lists for AES-CCM

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This patch updates the NX driver to perform several hyper calls when necessary
so that the length limits of scatter/gather lists are respected.

Reviewed-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Fionnuala Gunter <fin@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Fionnuala Gunter 2013-08-29 11:36:37 -03:00 committed by Herbert Xu
parent 9d6f1a82d3
commit 2b188b3b86
1 changed files with 210 additions and 77 deletions
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287
drivers/crypto/nx/nx-aes-ccm.c
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@ -179,13 +179,26 @@ static int generate_pat(u8 *iv,
struct nx_sg *nx_insg = nx_ctx->in_sg;
struct nx_sg *nx_outsg = nx_ctx->out_sg;
unsigned int iauth_len = 0;
struct vio_pfo_op *op = NULL;
u8 tmp[16], *b1 = NULL, *b0 = NULL, *result = NULL;
int rc;
/* zero the ctr value */
memset(iv + 15 - iv[0], 0, iv[0] + 1);
/* page 78 of nx_wb.pdf has,
* Note: RFC3610 allows the AAD data to be up to 2^64 -1 bytes
* in length. If a full message is used, the AES CCA implementation
* restricts the maximum AAD length to 2^32 -1 bytes.
* If partial messages are used, the implementation supports
* 2^64 -1 bytes maximum AAD length.
*
* However, in the cryptoapi's aead_request structure,
* assoclen is an unsigned int, thus it cannot hold a length
* value greater than 2^32 - 1.
* Thus the AAD is further constrained by this and is never
* greater than 2^32.
*/
if (!req->assoclen) {
b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
} else if (req->assoclen <= 14) {
@ -195,7 +208,46 @@ static int generate_pat(u8 *iv,
b0 = nx_ctx->csbcpb->cpb.aes_ccm.in_pat_or_b0;
b1 = nx_ctx->priv.ccm.iauth_tag;
iauth_len = req->assoclen;
} else if (req->assoclen <= 65280) {
/* if associated data is less than (2^16 - 2^8), we construct
* B1 differently and feed in the associated data to a CCA
* operation */
b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
iauth_len = 14;
} else {
b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
iauth_len = 10;
}
/* generate B0 */
rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
if (rc)
return rc;
/* generate B1:
* add control info for associated data
* RFC 3610 and NIST Special Publication 800-38C
*/
if (b1) {
memset(b1, 0, 16);
if (req->assoclen <= 65280) {
*(u16 *)b1 = (u16)req->assoclen;
scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
iauth_len, SCATTERWALK_FROM_SG);
} else {
*(u16 *)b1 = (u16)(0xfffe);
*(u32 *)&b1[2] = (u32)req->assoclen;
scatterwalk_map_and_copy(b1 + 6, req->assoc, 0,
iauth_len, SCATTERWALK_FROM_SG);
}
}
/* now copy any remaining AAD to scatterlist and call nx... */
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,
nx_ctx->ap->sglen);
@ -210,56 +262,74 @@ static int generate_pat(u8 *iv,
NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_ENDE_ENCRYPT;
NX_CPB_FDM(nx_ctx->csbcpb) |= NX_FDM_INTERMEDIATE;
op = &nx_ctx->op;
result = nx_ctx->csbcpb->cpb.aes_ccm.out_pat_or_mac;
} else if (req->assoclen <= 65280) {
/* if associated data is less than (2^16 - 2^8), we construct
* B1 differently and feed in the associated data to a CCA
* operation */
b0 = nx_ctx->csbcpb_aead->cpb.aes_cca.b0;
b1 = nx_ctx->csbcpb_aead->cpb.aes_cca.b1;
iauth_len = 14;
/* remaining assoc data must have scatterlist built for it */
nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen,
req->assoc, iauth_len,
req->assoclen - iauth_len);
nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_insg) *
sizeof(struct nx_sg);
op = &nx_ctx->op_aead;
result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
} else {
/* if associated data is less than (2^32), we construct B1
* differently yet again and feed in the associated data to a
* CCA operation */
pr_err("associated data len is %u bytes (returning -EINVAL)\n",
req->assoclen);
rc = -EINVAL;
}
rc = generate_b0(iv, req->assoclen, authsize, nbytes, b0);
if (rc)
goto done;
if (b1) {
memset(b1, 0, 16);
*(u16 *)b1 = (u16)req->assoclen;
scatterwalk_map_and_copy(b1 + 2, req->assoc, 0,
iauth_len, SCATTERWALK_FROM_SG);
rc = nx_hcall_sync(nx_ctx, op,
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto done;
return rc;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(req->assoclen, &(nx_ctx->stats->aes_bytes));
memcpy(out, result, AES_BLOCK_SIZE);
} 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;
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));
if ((to_process + processed) < req->assoclen) {
NX_CPB_FDM(nx_ctx->csbcpb_aead) |=
NX_FDM_INTERMEDIATE;
} else {
NX_CPB_FDM(nx_ctx->csbcpb_aead) &=
~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);
result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
return rc;
memcpy(nx_ctx->csbcpb_aead->cpb.aes_cca.b0,
nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0,
AES_BLOCK_SIZE);
NX_CPB_FDM(nx_ctx->csbcpb_aead) |= NX_FDM_CONTINUATION;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(req->assoclen,
&(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < req->assoclen);
result = nx_ctx->csbcpb_aead->cpb.aes_cca.out_pat_or_b0;
}
done:
memcpy(out, result, AES_BLOCK_SIZE);
return rc;
}
@ -272,15 +342,12 @@ static int ccm_nx_decrypt(struct aead_request *req,
unsigned int authsize = crypto_aead_authsize(crypto_aead_reqtfm(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);
if (nbytes > nx_ctx->ap->databytelen) {
rc = -EINVAL;
goto out;
}
nbytes -= authsize;
/* copy out the auth tag to compare with later */
@ -293,22 +360,56 @@ static int ccm_nx_decrypt(struct aead_request *req,
if (rc)
goto out;
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes, 0,
csbcpb->cpb.aes_ccm.iv_or_ctr);
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);
NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_INTERMEDIATE;
do {
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
/* 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));
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
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,
csbcpb->cpb.aes_ccm.iv_or_ctr);
if (rc)
goto out;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
if (rc)
goto out;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(csbcpb->csb.processed_byte_count,
&(nx_ctx->stats->aes_bytes));
/* for partial completion, copy following for next
* entry into loop...
*/
memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_ccm.in_s0,
csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
/* update stats */
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(csbcpb->csb.processed_byte_count,
&(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
rc = memcmp(csbcpb->cpb.aes_ccm.out_pat_or_mac, priv->oauth_tag,
authsize) ? -EBADMSG : 0;
@ -325,41 +426,73 @@ static int ccm_nx_encrypt(struct aead_request *req,
unsigned int nbytes = req->cryptlen;
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);
if (nbytes > nx_ctx->ap->databytelen) {
rc = -EINVAL;
goto out;
}
rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes,
csbcpb->cpb.aes_ccm.in_pat_or_b0);
if (rc)
goto out;
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src, nbytes, 0,
csbcpb->cpb.aes_ccm.iv_or_ctr);
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);
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
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));
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
if ((to_process + processed) < nbytes)
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
else
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(csbcpb->csb.processed_byte_count,
&(nx_ctx->stats->aes_bytes));
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
to_process, processed,
csbcpb->cpb.aes_ccm.iv_or_ctr);
if (rc)
goto out;
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
/* for partial completion, copy following for next
* entry into loop...
*/
memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
memcpy(csbcpb->cpb.aes_ccm.in_s0,
csbcpb->cpb.aes_ccm.out_s0, AES_BLOCK_SIZE);
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
/* update stats */
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic64_add(csbcpb->csb.processed_byte_count,
&(nx_ctx->stats->aes_bytes));
processed += to_process;
} while (processed < nbytes);
/* copy out the auth tag */
scatterwalk_map_and_copy(csbcpb->cpb.aes_ccm.out_pat_or_mac,
req->dst, nbytes, authsize,
SCATTERWALK_TO_SG);
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return rc;