[PATCH 0/4] crypto: fixes and cleanups

[PATCH 0/4] crypto: fixes and cleanups

[Gilad Ben-Yossef]

The patch set fixes ccree IV handling and finuo() operation (provided
by Hadar Gat) along a code cleanup.

Since our finup() method was obviously broken but was not detected
by testmgr, I've added finup() test to testmgr to catch it next
time it happened

Gilad Ben-Yossef (3):
  crypto: testmgr: add hash finup tests
  crypto: ccree: fix iv handling
  crypto: ccree: remove dead legacy code

Hadar Gat (1):
  crypto: ccree: fix finup

 crypto/testmgr.c                 |  55 +++++++++++++++---
 drivers/crypto/ccree/cc_cipher.c | 117 ++++++++++++++++++++++++++++-----------
 drivers/crypto/ccree/cc_hash.c   |  81 ++++++---------------------
 3 files changed, 146 insertions(+), 107 deletions(-)

-- 
2.7.4

[PATCH 1/4] crypto: ccree: fix finup

[Gilad Ben-Yossef]

From: Hadar Gat <hadar.gat@arm.com>

finup() operation was incorrect, padding was missing.
Fix by setting the ccree HW to enable padding.

Signed-off-by: Hadar Gat <hadar.gat@arm.com>
[ gilad@benyossef.com: refactored for better code sharing ]
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: stable@vger.kernel.org
---
 drivers/crypto/ccree/cc_hash.c | 81 +++++++++---------------------------------
 1 file changed, 16 insertions(+), 65 deletions(-)

diff --git a/drivers/crypto/ccree/cc_hash.c b/drivers/crypto/ccree/cc_hash.c
index 96ff777..e4ebde0 100644
--- a/drivers/crypto/ccree/cc_hash.c
+++ b/drivers/crypto/ccree/cc_hash.c
@@ -602,66 +602,7 @@ static int cc_hash_update(struct ahash_request *req)
 	return rc;
 }
 
-static int cc_hash_finup(struct ahash_request *req)
-{
-	struct ahash_req_ctx *state = ahash_request_ctx(req);
-	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
-	struct cc_hash_ctx *ctx = crypto_ahash_ctx(tfm);
-	u32 digestsize = crypto_ahash_digestsize(tfm);
-	struct scatterlist *src = req->src;
-	unsigned int nbytes = req->nbytes;
-	u8 *result = req->result;
-	struct device *dev = drvdata_to_dev(ctx->drvdata);
-	bool is_hmac = ctx->is_hmac;
-	struct cc_crypto_req cc_req = {};
-	struct cc_hw_desc desc[CC_MAX_HASH_SEQ_LEN];
-	unsigned int idx = 0;
-	int rc;
-	gfp_t flags = cc_gfp_flags(&req->base);
-
-	dev_dbg(dev, "===== %s-finup (%d) ====\n", is_hmac ? "hmac" : "hash",
-		nbytes);
-
-	if (cc_map_req(dev, state, ctx)) {
-		dev_err(dev, "map_ahash_source() failed\n");
-		return -EINVAL;
-	}
-
-	if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, 1,
-				      flags)) {
-		dev_err(dev, "map_ahash_request_final() failed\n");
-		cc_unmap_req(dev, state, ctx);
-		return -ENOMEM;
-	}
-	if (cc_map_result(dev, state, digestsize)) {
-		dev_err(dev, "map_ahash_digest() failed\n");
-		cc_unmap_hash_request(dev, state, src, true);
-		cc_unmap_req(dev, state, ctx);
-		return -ENOMEM;
-	}
-
-	/* Setup request structure */
-	cc_req.user_cb = cc_hash_complete;
-	cc_req.user_arg = req;
-
-	idx = cc_restore_hash(desc, ctx, state, idx);
-
-	if (is_hmac)
-		idx = cc_fin_hmac(desc, req, idx);
-
-	idx = cc_fin_result(desc, req, idx);
-
-	rc = cc_send_request(ctx->drvdata, &cc_req, desc, idx, &req->base);
-	if (rc != -EINPROGRESS && rc != -EBUSY) {
-		dev_err(dev, "send_request() failed (rc=%d)\n", rc);
-		cc_unmap_hash_request(dev, state, src, true);
-		cc_unmap_result(dev, state, digestsize, result);
-		cc_unmap_req(dev, state, ctx);
-	}
-	return rc;
-}
-
-static int cc_hash_final(struct ahash_request *req)
+static int cc_do_finup(struct ahash_request *req, bool update)
 {
 	struct ahash_req_ctx *state = ahash_request_ctx(req);
 	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
@@ -678,21 +619,20 @@ static int cc_hash_final(struct ahash_request *req)
 	int rc;
 	gfp_t flags = cc_gfp_flags(&req->base);
 
-	dev_dbg(dev, "===== %s-final (%d) ====\n", is_hmac ? "hmac" : "hash",
-		nbytes);
+	dev_dbg(dev, "===== %s-%s (%d) ====\n", is_hmac ? "hmac" : "hash",
+		update ? "finup" : "final", nbytes);
 
 	if (cc_map_req(dev, state, ctx)) {
 		dev_err(dev, "map_ahash_source() failed\n");
 		return -EINVAL;
 	}
 
-	if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, 0,
+	if (cc_map_hash_request_final(ctx->drvdata, state, src, nbytes, update,
 				      flags)) {
 		dev_err(dev, "map_ahash_request_final() failed\n");
 		cc_unmap_req(dev, state, ctx);
 		return -ENOMEM;
 	}
-
 	if (cc_map_result(dev, state, digestsize)) {
 		dev_err(dev, "map_ahash_digest() failed\n");
 		cc_unmap_hash_request(dev, state, src, true);
@@ -706,7 +646,7 @@ static int cc_hash_final(struct ahash_request *req)
 
 	idx = cc_restore_hash(desc, ctx, state, idx);
 
-	/* "DO-PAD" must be enabled only when writing current length to HW */
+	/* Pad the hash */
 	hw_desc_init(&desc[idx]);
 	set_cipher_do(&desc[idx], DO_PAD);
 	set_cipher_mode(&desc[idx], ctx->hw_mode);
@@ -731,6 +671,17 @@ static int cc_hash_final(struct ahash_request *req)
 	return rc;
 }
 
+static int cc_hash_finup(struct ahash_request *req)
+{
+	return cc_do_finup(req, true);
+}
+
+
+static int cc_hash_final(struct ahash_request *req)
+{
+	return cc_do_finup(req, false);
+}
+
 static int cc_hash_init(struct ahash_request *req)
 {
 	struct ahash_req_ctx *state = ahash_request_ctx(req);
-- 
2.7.4

[PATCH 2/4] crypto: testmgr: add hash finup tests

[Gilad Ben-Yossef]

The testmgr hash tests were testing init, digest, update and final
methods but not the finup method. Add a test for this one too.

While doing this, make sure we only run the partial tests once with
the digest tests and skip them with the final and finup tests since
they are the same.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 crypto/testmgr.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 11e4535..ca475f6 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -259,9 +259,15 @@ static int ahash_partial_update(struct ahash_request **preq,
 	return ret;
 }
 
+enum hash_test {
+	HASH_TEST_DIGEST,
+	HASH_TEST_FINAL,
+	HASH_TEST_FINUP
+};
+
 static int __test_hash(struct crypto_ahash *tfm,
 		       const struct hash_testvec *template, unsigned int tcount,
-		       bool use_digest, const int align_offset)
+		       enum hash_test test_type, const int align_offset)
 {
 	const char *algo = crypto_tfm_alg_driver_name(crypto_ahash_tfm(tfm));
 	size_t digest_size = crypto_ahash_digestsize(tfm);
@@ -332,14 +338,17 @@ static int __test_hash(struct crypto_ahash *tfm,
 		}
 
 		ahash_request_set_crypt(req, sg, result, template[i].psize);
-		if (use_digest) {
+		switch (test_type) {
+		case HASH_TEST_DIGEST:
 			ret = crypto_wait_req(crypto_ahash_digest(req), &wait);
 			if (ret) {
 				pr_err("alg: hash: digest failed on test %d "
 				       "for %s: ret=%d\n", j, algo, -ret);
 				goto out;
 			}
-		} else {
+			break;
+
+		case HASH_TEST_FINAL:
 			memset(result, 1, digest_size);
 			ret = crypto_wait_req(crypto_ahash_init(req), &wait);
 			if (ret) {
@@ -371,6 +380,29 @@ static int __test_hash(struct crypto_ahash *tfm,
 				       "for %s: ret=%d\n", j, algo, -ret);
 				goto out;
 			}
+			break;
+
+		case HASH_TEST_FINUP:
+			memset(result, 1, digest_size);
+			ret = crypto_wait_req(crypto_ahash_init(req), &wait);
+			if (ret) {
+				pr_err("alg: hash: init failed on test %d "
+				       "for %s: ret=%d\n", j, algo, -ret);
+				goto out;
+			}
+			ret = ahash_guard_result(result, 1, digest_size);
+			if (ret) {
+				pr_err("alg: hash: init failed on test %d "
+				       "for %s: used req->result\n", j, algo);
+				goto out;
+			}
+			ret = crypto_wait_req(crypto_ahash_finup(req), &wait);
+			if (ret) {
+				pr_err("alg: hash: final failed on test %d "
+				       "for %s: ret=%d\n", j, algo, -ret);
+				goto out;
+			}
+			break;
 		}
 
 		if (memcmp(result, template[i].digest,
@@ -383,6 +415,9 @@ static int __test_hash(struct crypto_ahash *tfm,
 		}
 	}
 
+	if (test_type)
+		goto out;
+
 	j = 0;
 	for (i = 0; i < tcount; i++) {
 		/* alignment tests are only done with continuous buffers */
@@ -540,24 +575,24 @@ static int __test_hash(struct crypto_ahash *tfm,
 
 static int test_hash(struct crypto_ahash *tfm,
 		     const struct hash_testvec *template,
-		     unsigned int tcount, bool use_digest)
+		     unsigned int tcount, enum hash_test test_type)
 {
 	unsigned int alignmask;
 	int ret;
 
-	ret = __test_hash(tfm, template, tcount, use_digest, 0);
+	ret = __test_hash(tfm, template, tcount, test_type, 0);
 	if (ret)
 		return ret;
 
 	/* test unaligned buffers, check with one byte offset */
-	ret = __test_hash(tfm, template, tcount, use_digest, 1);
+	ret = __test_hash(tfm, template, tcount, test_type, 1);
 	if (ret)
 		return ret;
 
 	alignmask = crypto_tfm_alg_alignmask(&tfm->base);
 	if (alignmask) {
 		/* Check if alignment mask for tfm is correctly set. */
-		ret = __test_hash(tfm, template, tcount, use_digest,
+		ret = __test_hash(tfm, template, tcount, test_type,
 				  alignmask + 1);
 		if (ret)
 			return ret;
@@ -1803,9 +1838,11 @@ static int __alg_test_hash(const struct hash_testvec *template,
 		return PTR_ERR(tfm);
 	}
 
-	err = test_hash(tfm, template, tcount, true);
+	err = test_hash(tfm, template, tcount, HASH_TEST_DIGEST);
+	if (!err)
+		err = test_hash(tfm, template, tcount, HASH_TEST_FINAL);
 	if (!err)
-		err = test_hash(tfm, template, tcount, false);
+		err = test_hash(tfm, template, tcount, HASH_TEST_FINUP);
 	crypto_free_ahash(tfm);
 	return err;
 }
-- 
2.7.4

[PATCH 3/4] crypto: ccree: fix iv handling

[Gilad Ben-Yossef]

We were copying our last cipher block into the request for use as IV for
all modes of operations. Fix this by discerning the behaviour based on
the mode of operation used: copy ciphertext for CBC, update counter for
CTR.

CC: stable@vger.kernel.org
Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support")
Reported by: Hadar Gat <hadar.gat@arm.com>
Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/crypto/ccree/cc_cipher.c | 111 +++++++++++++++++++++++++++++----------
 1 file changed, 84 insertions(+), 27 deletions(-)

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index d2810c1..3af44a5 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -593,34 +593,82 @@ static void cc_setup_cipher_data(struct crypto_tfm *tfm,
 	}
 }
 
+/*
+ * Update a CTR-AES 128 bit counter
+ */
+void cc_update_ctr(u8 *ctr, unsigned int increment)
+{
+	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+	    IS_ALIGNED((unsigned long)ctr, 8)) {
+
+		__be64 *high_be = (__be64 *)ctr;
+		__be64 *low_be = high_be + 1;
+		u64 orig_low = __be64_to_cpu(*low_be);
+		u64 new_low = orig_low + (u64)increment;
+
+		*low_be = __cpu_to_be64(new_low);
+
+		if (new_low < orig_low)
+			*high_be = __cpu_to_be64(__be64_to_cpu(*high_be) + 1);
+	} else {
+		u8 *pos = (ctr + AES_BLOCK_SIZE);
+		u8 val;
+		unsigned int size;
+
+		for (; increment; increment--)
+			for (size = AES_BLOCK_SIZE; size; size--) {
+				val = *--pos + 1;
+				*pos = val;
+				if (val)
+					break;
+			}
+	}
+}
+
 static void cc_cipher_complete(struct device *dev, void *cc_req, int err)
 {
 	struct skcipher_request *req = (struct skcipher_request *)cc_req;
 	struct scatterlist *dst = req->dst;
 	struct scatterlist *src = req->src;
 	struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req);
-	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
-	unsigned int ivsize = crypto_skcipher_ivsize(tfm);
+	struct crypto_skcipher *sk_tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_tfm *tfm = crypto_skcipher_tfm(sk_tfm);
+	struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm);
+	unsigned int ivsize = crypto_skcipher_ivsize(sk_tfm);
+	unsigned int len;
 
-	cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
-	kzfree(req_ctx->iv);
+	switch (ctx_p->cipher_mode) {
+	case DRV_CIPHER_CBC:
+		/*
+		 * The crypto API expects us to set the req->iv to the last
+		 * ciphertext block. For encrypt, simply copy from the result.
+		 * For decrypt, we must copy from a saved buffer since this
+		 * could be an in-place decryption operation and the src is
+		 * lost by this point.
+		 */
+		if (req_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT)  {
+			memcpy(req->iv, req_ctx->backup_info, ivsize);
+			kzfree(req_ctx->backup_info);
+		} else if (!err) {
+			len = req->cryptlen - ivsize;
+			scatterwalk_map_and_copy(req->iv, req->dst, len,
+						 ivsize, 0);
+		}
+		break;
 
-	/*
-	 * The crypto API expects us to set the req->iv to the last
-	 * ciphertext block. For encrypt, simply copy from the result.
-	 * For decrypt, we must copy from a saved buffer since this
-	 * could be an in-place decryption operation and the src is
-	 * lost by this point.
-	 */
-	if (req_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT)  {
-		memcpy(req->iv, req_ctx->backup_info, ivsize);
-		kzfree(req_ctx->backup_info);
-	} else if (!err) {
-		scatterwalk_map_and_copy(req->iv, req->dst,
-					 (req->cryptlen - ivsize),
-					 ivsize, 0);
+	case DRV_CIPHER_CTR:
+		/* Compute the counter of the last block */
+		len = ALIGN(req->cryptlen, AES_BLOCK_SIZE) / AES_BLOCK_SIZE;
+		cc_update_ctr((u8 *)req->iv, len);
+		break;
+
+	default:
+		break;
 	}
 
+	cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
+	kzfree(req_ctx->iv);
+
 	skcipher_request_complete(req, err);
 }
 
@@ -752,20 +800,29 @@ static int cc_cipher_encrypt(struct skcipher_request *req)
 static int cc_cipher_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *sk_tfm = crypto_skcipher_reqtfm(req);
+	struct crypto_tfm *tfm = crypto_skcipher_tfm(sk_tfm);
+	struct cc_cipher_ctx *ctx_p = crypto_tfm_ctx(tfm);
 	struct cipher_req_ctx *req_ctx = skcipher_request_ctx(req);
 	unsigned int ivsize = crypto_skcipher_ivsize(sk_tfm);
 	gfp_t flags = cc_gfp_flags(&req->base);
+	unsigned int len;
 
-	/*
-	 * Allocate and save the last IV sized bytes of the source, which will
-	 * be lost in case of in-place decryption and might be needed for CTS.
-	 */
-	req_ctx->backup_info = kmalloc(ivsize, flags);
-	if (!req_ctx->backup_info)
-		return -ENOMEM;
+	if (ctx_p->cipher_mode == DRV_CIPHER_CBC) {
+
+		/* Allocate and save the last IV sized bytes of the source,
+		 * which will be lost in case of in-place decryption.
+		 */
+		req_ctx->backup_info = kzalloc(ivsize, flags);
+		if (!req_ctx->backup_info)
+			return -ENOMEM;
+
+		len = req->cryptlen - ivsize;
+		scatterwalk_map_and_copy(req_ctx->backup_info, req->src, len,
+					 ivsize, 0);
+	} else {
+		req_ctx->backup_info = NULL;
+	}
 
-	scatterwalk_map_and_copy(req_ctx->backup_info, req->src,
-				 (req->cryptlen - ivsize), ivsize, 0);
 	req_ctx->is_giv = false;
 
 	return cc_cipher_process(req, DRV_CRYPTO_DIRECTION_DECRYPT);
-- 
2.7.4

Re: [PATCH 3/4] crypto: ccree: fix iv handling

[kbuild test robot]

Hi Gilad,

I love your patch! Perhaps something to improve:

[auto build test WARNING on cryptodev/master]
[also build test WARNING on v4.18-rc2 next-20180628]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Gilad-Ben-Yossef/crypto-ccree-fix-finup/20180628-162032
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

   drivers/crypto/ccree/cc_cipher.c:369:17: sparse: Variable length array is used.
>> drivers/crypto/ccree/cc_cipher.c:599:6: sparse: symbol 'cc_update_ctr' was not declared. Should it be static?

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[RFC PATCH] crypto: ccree: cc_update_ctr() can be static

[kbuild test robot]

Fixes: 27646566a1a0 ("crypto: ccree: fix iv handling")
Signed-off-by: kbuild test robot <fengguang.wu@intel.com>
---
 cc_cipher.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index 3af44a5..958ced3 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -596,7 +596,7 @@ static void cc_setup_cipher_data(struct crypto_tfm *tfm,
 /*
  * Update a CTR-AES 128 bit counter
  */
-void cc_update_ctr(u8 *ctr, unsigned int increment)
+static void cc_update_ctr(u8 *ctr, unsigned int increment)
 {
 	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
 	    IS_ALIGNED((unsigned long)ctr, 8)) {

[PATCH 4/4] crypto: ccree: remove dead legacy code

[Gilad Ben-Yossef]

Remove legacy code no longer used by anything.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/crypto/ccree/cc_cipher.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c
index 3af44a5..8204c87 100644
--- a/drivers/crypto/ccree/cc_cipher.c
+++ b/drivers/crypto/ccree/cc_cipher.c
@@ -730,12 +730,6 @@ static int cc_cipher_process(struct skcipher_request *req,
 	cc_req.user_cb = (void *)cc_cipher_complete;
 	cc_req.user_arg = (void *)req;
 
-#ifdef ENABLE_CYCLE_COUNT
-	cc_req.op_type = (direction == DRV_CRYPTO_DIRECTION_DECRYPT) ?
-		STAT_OP_TYPE_DECODE : STAT_OP_TYPE_ENCODE;
-
-#endif
-
 	/* Setup request context */
 	req_ctx->gen_ctx.op_type = direction;
 
-- 
2.7.4