crypto: nx - Fix SHA concurrence issue and sg limit bounds
NX SHA algorithms stores the message digest into tfm what
cause a concurrence issue where hashes may be replaced by others.
This patch cleans up the cases where it's handling unnecessarily shared
variables in nx context and copies the current msg digest to a sctx->state
in order to safetly handle with the hashe's state.
Also fixes and does some clean ups regarding the right sg max limit
and bounds to the sg list avoind a memory crash.
Signed-off-by: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/nx/nx-sha256.c b/drivers/crypto/nx/nx-sha256.c
index da0b24a..23621da 100644
--- a/drivers/crypto/nx/nx-sha256.c
+++ b/drivers/crypto/nx/nx-sha256.c
@@ -23,6 +23,7 @@
#include <crypto/sha.h>
#include <linux/module.h>
#include <asm/vio.h>
+#include <asm/byteorder.h>
#include "nx_csbcpb.h"
#include "nx.h"
@@ -32,7 +33,8 @@
{
struct sha256_state *sctx = shash_desc_ctx(desc);
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
- struct nx_sg *out_sg;
+ int len;
+ int rc;
nx_ctx_init(nx_ctx, HCOP_FC_SHA);
@@ -41,10 +43,28 @@
nx_ctx->ap = &nx_ctx->props[NX_PROPS_SHA256];
NX_CPB_SET_DIGEST_SIZE(nx_ctx->csbcpb, NX_DS_SHA256);
- out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *)sctx->state,
- SHA256_DIGEST_SIZE, nx_ctx->ap->sglen);
- nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
+ len = SHA256_DIGEST_SIZE;
+ rc = nx_sha_build_sg_list(nx_ctx, nx_ctx->out_sg,
+ &nx_ctx->op.outlen,
+ &len,
+ (u8 *) sctx->state,
+ NX_DS_SHA256);
+
+ if (rc)
+ goto out;
+
+ sctx->state[0] = __cpu_to_be32(SHA256_H0);
+ sctx->state[1] = __cpu_to_be32(SHA256_H1);
+ sctx->state[2] = __cpu_to_be32(SHA256_H2);
+ sctx->state[3] = __cpu_to_be32(SHA256_H3);
+ sctx->state[4] = __cpu_to_be32(SHA256_H4);
+ sctx->state[5] = __cpu_to_be32(SHA256_H5);
+ sctx->state[6] = __cpu_to_be32(SHA256_H6);
+ sctx->state[7] = __cpu_to_be32(SHA256_H7);
+ sctx->count = 0;
+
+out:
return 0;
}
@@ -54,11 +74,11 @@
struct sha256_state *sctx = shash_desc_ctx(desc);
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
- struct nx_sg *in_sg;
- u64 to_process, leftover, total;
- u32 max_sg_len;
+ u64 to_process = 0, leftover, total;
unsigned long irq_flags;
int rc = 0;
+ int data_len;
+ u64 buf_len = (sctx->count % SHA256_BLOCK_SIZE);
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
@@ -66,16 +86,16 @@
* 1: < SHA256_BLOCK_SIZE: copy into state, return 0
* 2: >= SHA256_BLOCK_SIZE: process X blocks, copy in leftover
*/
- total = sctx->count + len;
+ total = (sctx->count % SHA256_BLOCK_SIZE) + len;
if (total < SHA256_BLOCK_SIZE) {
- memcpy(sctx->buf + sctx->count, data, len);
+ memcpy(sctx->buf + buf_len, data, len);
sctx->count += len;
goto out;
}
- in_sg = nx_ctx->in_sg;
- max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
- nx_ctx->ap->sglen);
+ memcpy(csbcpb->cpb.sha256.message_digest, sctx->state, SHA256_DIGEST_SIZE);
+ NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
+ NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
do {
/*
@@ -83,34 +103,42 @@
* this update. This value is also restricted by the sg list
* limits.
*/
- to_process = min_t(u64, total, nx_ctx->ap->databytelen);
- to_process = min_t(u64, to_process,
- NX_PAGE_SIZE * (max_sg_len - 1));
+ to_process = total - to_process;
to_process = to_process & ~(SHA256_BLOCK_SIZE - 1);
+
+ if (buf_len) {
+ data_len = buf_len;
+ rc = nx_sha_build_sg_list(nx_ctx, nx_ctx->in_sg,
+ &nx_ctx->op.inlen,
+ &data_len,
+ (u8 *) sctx->buf,
+ NX_DS_SHA256);
+
+ if (rc || data_len != buf_len)
+ goto out;
+ }
+
+ data_len = to_process - buf_len;
+ rc = nx_sha_build_sg_list(nx_ctx, nx_ctx->in_sg,
+ &nx_ctx->op.inlen,
+ &data_len,
+ (u8 *) data,
+ NX_DS_SHA256);
+
+ if (rc)
+ goto out;
+
+ to_process = (data_len + buf_len);
leftover = total - to_process;
- if (sctx->count) {
- in_sg = nx_build_sg_list(nx_ctx->in_sg,
- (u8 *) sctx->buf,
- sctx->count, max_sg_len);
- }
- in_sg = nx_build_sg_list(in_sg, (u8 *) data,
- to_process - sctx->count,
- max_sg_len);
- nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
- sizeof(struct nx_sg);
-
- if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
- /*
- * we've hit the nx chip previously and we're updating
- * again, so copy over the partial digest.
- */
- memcpy(csbcpb->cpb.sha256.input_partial_digest,
+ /*
+ * we've hit the nx chip previously and we're updating
+ * again, so copy over the partial digest.
+ */
+ memcpy(csbcpb->cpb.sha256.input_partial_digest,
csbcpb->cpb.sha256.message_digest,
SHA256_DIGEST_SIZE);
- }
- NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
rc = -EINVAL;
goto out;
@@ -122,22 +150,19 @@
goto out;
atomic_inc(&(nx_ctx->stats->sha256_ops));
- csbcpb->cpb.sha256.message_bit_length += (u64)
- (csbcpb->cpb.sha256.spbc * 8);
-
- /* everything after the first update is continuation */
- NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
total -= to_process;
- data += to_process - sctx->count;
- sctx->count = 0;
- in_sg = nx_ctx->in_sg;
+ data += to_process - buf_len;
+ buf_len = 0;
+
} while (leftover >= SHA256_BLOCK_SIZE);
/* copy the leftover back into the state struct */
if (leftover)
memcpy(sctx->buf, data, leftover);
- sctx->count = leftover;
+
+ sctx->count += len;
+ memcpy(sctx->state, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return rc;
@@ -148,34 +173,46 @@
struct sha256_state *sctx = shash_desc_ctx(desc);
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
- struct nx_sg *in_sg, *out_sg;
- u32 max_sg_len;
unsigned long irq_flags;
int rc;
+ int len;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
- max_sg_len = min_t(u32, nx_driver.of.max_sg_len, nx_ctx->ap->sglen);
-
- if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
- /* we've hit the nx chip previously, now we're finalizing,
- * so copy over the partial digest */
- memcpy(csbcpb->cpb.sha256.input_partial_digest,
- csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
- }
-
/* final is represented by continuing the operation and indicating that
* this is not an intermediate operation */
- NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
+ if (sctx->count >= SHA256_BLOCK_SIZE) {
+ /* we've hit the nx chip previously, now we're finalizing,
+ * so copy over the partial digest */
+ memcpy(csbcpb->cpb.sha256.input_partial_digest, sctx->state, SHA256_DIGEST_SIZE);
+ NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
+ NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
+ } else {
+ NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;
+ NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION;
+ }
- csbcpb->cpb.sha256.message_bit_length += (u64)(sctx->count * 8);
+ csbcpb->cpb.sha256.message_bit_length = (u64) (sctx->count * 8);
- in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buf,
- sctx->count, max_sg_len);
- out_sg = nx_build_sg_list(nx_ctx->out_sg, out, SHA256_DIGEST_SIZE,
- max_sg_len);
- 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);
+ len = sctx->count & (SHA256_BLOCK_SIZE - 1);
+ rc = nx_sha_build_sg_list(nx_ctx, nx_ctx->in_sg,
+ &nx_ctx->op.inlen,
+ &len,
+ (u8 *) sctx->buf,
+ NX_DS_SHA256);
+
+ if (rc || len != (sctx->count & (SHA256_BLOCK_SIZE - 1)))
+ goto out;
+
+ len = SHA256_DIGEST_SIZE;
+ rc = nx_sha_build_sg_list(nx_ctx, nx_ctx->out_sg,
+ &nx_ctx->op.outlen,
+ &len,
+ out,
+ NX_DS_SHA256);
+
+ if (rc || len != SHA256_DIGEST_SIZE)
+ goto out;
if (!nx_ctx->op.outlen) {
rc = -EINVAL;
@@ -189,8 +226,7 @@
atomic_inc(&(nx_ctx->stats->sha256_ops));
- atomic64_add(csbcpb->cpb.sha256.message_bit_length / 8,
- &(nx_ctx->stats->sha256_bytes));
+ atomic64_add(sctx->count, &(nx_ctx->stats->sha256_bytes));
memcpy(out, csbcpb->cpb.sha256.message_digest, SHA256_DIGEST_SIZE);
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
@@ -200,62 +236,18 @@
static int nx_sha256_export(struct shash_desc *desc, void *out)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
- struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
- struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
- struct sha256_state *octx = out;
- unsigned long irq_flags;
- spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+ memcpy(out, sctx, sizeof(*sctx));
- octx->count = sctx->count +
- (csbcpb->cpb.sha256.message_bit_length / 8);
- memcpy(octx->buf, sctx->buf, sizeof(octx->buf));
-
- /* if no data has been processed yet, we need to export SHA256's
- * initial data, in case this context gets imported into a software
- * context */
- if (csbcpb->cpb.sha256.message_bit_length)
- memcpy(octx->state, csbcpb->cpb.sha256.message_digest,
- SHA256_DIGEST_SIZE);
- else {
- octx->state[0] = SHA256_H0;
- octx->state[1] = SHA256_H1;
- octx->state[2] = SHA256_H2;
- octx->state[3] = SHA256_H3;
- octx->state[4] = SHA256_H4;
- octx->state[5] = SHA256_H5;
- octx->state[6] = SHA256_H6;
- octx->state[7] = SHA256_H7;
- }
-
- spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return 0;
}
static int nx_sha256_import(struct shash_desc *desc, const void *in)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
- struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
- struct nx_csbcpb *csbcpb = (struct nx_csbcpb *)nx_ctx->csbcpb;
- const struct sha256_state *ictx = in;
- unsigned long irq_flags;
- spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+ memcpy(sctx, in, sizeof(*sctx));
- memcpy(sctx->buf, ictx->buf, sizeof(ictx->buf));
-
- sctx->count = ictx->count & 0x3f;
- csbcpb->cpb.sha256.message_bit_length = (ictx->count & ~0x3f) * 8;
-
- if (csbcpb->cpb.sha256.message_bit_length) {
- memcpy(csbcpb->cpb.sha256.message_digest, ictx->state,
- SHA256_DIGEST_SIZE);
-
- NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
- NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
- }
-
- spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return 0;
}