Patch "crypto: crypto4xx - perform aead icv check in the driver" has been added to the 4.15-stable tree

Patch "crypto: crypto4xx - perform aead icv check in the driver" has been added to the 4.15-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    crypto: crypto4xx - perform aead icv check in the driver

to the 4.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-crypto4xx-perform-aead-icv-check-in-the-driver.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 10:16:32 CEST 2018
From: Christian Lamparter <chunkeey@gmail.com>
Date: Sat, 23 Dec 2017 19:45:46 +0100
Subject: crypto: crypto4xx - perform aead icv check in the driver

From: Christian Lamparter <chunkeey@gmail.com>


[ Upstream commit 0b5a7f71b4c557b15ec54a1b49023bc1b21044cc ]

The ccm-aes-ppc4xx now fails one of testmgr's expected
failure test cases as such:

|decryption failed on test 10 for ccm-aes-ppc4xx:
|ret was 0, |expected -EBADMSG

It doesn't look like the hardware sets the authentication failure
flag. The original vendor source from which this was ported does
not have any special code or notes about why this would happen or
if there are any WAs.

Hence, this patch converts the aead_done callback handler to
perform the icv check in the driver. And this fixes the false
negative and the ccm-aes-ppc4xx passes the selftests once again.

|name         : ccm(aes)
|driver       : ccm-aes-ppc4xx
|module       : crypto4xx
|priority     : 300
|refcnt       : 1
|selftest     : passed
|internal     : no
|type         : aead
|async        : yes
|blocksize    : 1
|ivsize       : 16
|maxauthsize  : 16
|geniv        : <none>

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/crypto/amcc/crypto4xx_alg.c  |    6 ---
 drivers/crypto/amcc/crypto4xx_core.c |   54 +++++++++++++++++------------------
 2 files changed, 28 insertions(+), 32 deletions(-)

--- a/drivers/crypto/amcc/crypto4xx_alg.c
+++ b/drivers/crypto/amcc/crypto4xx_alg.c
@@ -256,10 +256,6 @@ static inline bool crypto4xx_aead_need_f
 	if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
 		return true;
 
-	/* CCM - fix CBC MAC mismatch in special case */
-	if (is_ccm && decrypt && !req->assoclen)
-		return true;
-
 	return false;
 }
 
@@ -330,7 +326,7 @@ int crypto4xx_setkey_aes_ccm(struct cryp
 	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 	sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
 
-	set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
+	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 				 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 				 SA_CIPHER_ALG_AES,
--- a/drivers/crypto/amcc/crypto4xx_core.c
+++ b/drivers/crypto/amcc/crypto4xx_core.c
@@ -570,15 +570,14 @@ static void crypto4xx_aead_done(struct c
 				struct pd_uinfo *pd_uinfo,
 				struct ce_pd *pd)
 {
-	struct aead_request *aead_req;
-	struct crypto4xx_ctx *ctx;
+	struct aead_request *aead_req = container_of(pd_uinfo->async_req,
+		struct aead_request, base);
 	struct scatterlist *dst = pd_uinfo->dest_va;
+	size_t cp_len = crypto_aead_authsize(
+		crypto_aead_reqtfm(aead_req));
+	u32 icv[cp_len];
 	int err = 0;
 
-	aead_req = container_of(pd_uinfo->async_req, struct aead_request,
-				base);
-	ctx  = crypto_tfm_ctx(aead_req->base.tfm);
-
 	if (pd_uinfo->using_sd) {
 		crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo,
 					  pd->pd_ctl_len.bf.pkt_len,
@@ -590,38 +589,39 @@ static void crypto4xx_aead_done(struct c
 
 	if (pd_uinfo->sa_va->sa_command_0.bf.dir == DIR_OUTBOUND) {
 		/* append icv at the end */
-		size_t cp_len = crypto_aead_authsize(
-			crypto_aead_reqtfm(aead_req));
-		u32 icv[cp_len];
-
 		crypto4xx_memcpy_from_le32(icv, pd_uinfo->sr_va->save_digest,
 					   cp_len);
 
 		scatterwalk_map_and_copy(icv, dst, aead_req->cryptlen,
 					 cp_len, 1);
+	} else {
+		/* check icv at the end */
+		scatterwalk_map_and_copy(icv, aead_req->src,
+			aead_req->assoclen + aead_req->cryptlen -
+			cp_len, cp_len, 0);
+
+		crypto4xx_memcpy_from_le32(icv, icv, cp_len);
+
+		if (crypto_memneq(icv, pd_uinfo->sr_va->save_digest, cp_len))
+			err = -EBADMSG;
 	}
 
 	crypto4xx_ret_sg_desc(dev, pd_uinfo);
 
 	if (pd->pd_ctl.bf.status & 0xff) {
-		if (pd->pd_ctl.bf.status & 0x1) {
-			/* authentication error */
-			err = -EBADMSG;
-		} else {
-			if (!__ratelimit(&dev->aead_ratelimit)) {
-				if (pd->pd_ctl.bf.status & 2)
-					pr_err("pad fail error\n");
-				if (pd->pd_ctl.bf.status & 4)
-					pr_err("seqnum fail\n");
-				if (pd->pd_ctl.bf.status & 8)
-					pr_err("error _notify\n");
-				pr_err("aead return err status = 0x%02x\n",
-					pd->pd_ctl.bf.status & 0xff);
-				pr_err("pd pad_ctl = 0x%08x\n",
-					pd->pd_ctl.bf.pd_pad_ctl);
-			}
-			err = -EINVAL;
+		if (!__ratelimit(&dev->aead_ratelimit)) {
+			if (pd->pd_ctl.bf.status & 2)
+				pr_err("pad fail error\n");
+			if (pd->pd_ctl.bf.status & 4)
+				pr_err("seqnum fail\n");
+			if (pd->pd_ctl.bf.status & 8)
+				pr_err("error _notify\n");
+			pr_err("aead return err status = 0x%02x\n",
+				pd->pd_ctl.bf.status & 0xff);
+			pr_err("pd pad_ctl = 0x%08x\n",
+				pd->pd_ctl.bf.pd_pad_ctl);
 		}
+		err = -EINVAL;
 	}
 
 	if (pd_uinfo->state & PD_ENTRY_BUSY)


Patches currently in stable-queue which might be from chunkeey@gmail.com are

queue-4.15/crypto-crypto4xx-perform-aead-icv-check-in-the-driver.patch