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FAILED: patch "[PATCH] crypto: caam/qi - add support for more XTS key lengths" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message Oct 24, 2020

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Stable branch Crypto API Freescale CAAM (Cryptographic Acceleration and Assurance Module) driver
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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 62b9a6690926ee199445b23fd46e6349d9057146 Mon Sep 17 00:00:00 2001
From: Andrei Botila <[email protected]>
Date: Tue, 22 Sep 2020 19:03:23 +0300
Subject: [PATCH] crypto: caam/qi - add support for more XTS key lengths
MIME-Version: 1.0
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CAAM accelerator only supports XTS-AES-128 and XTS-AES-256 since it adheres strictly to the standard. All the other key lengths are accepted and processed through a fallback as long as they pass the xts_verify_key() checks.

Fixes b189817cf789 ("crypto: caam/qi - add ablkcipher and authenc algorithms")
Cc <[email protected]> # v4.12+
Signed-off-by Andrei Botila <[email protected]>
Reviewed-by Horia Geantă <[email protected]>
Signed-off-by Herbert Xu <[email protected]>
drivers/crypto/caam/caamalg_qi.c +10 -3
index ee801370c879..30aceaf325d7 100644
@@ -18,6 +18,7 @@
 #include "qi.h"
 #include "jr.h"
 #include "caamalg_desc.h"
+#include <crypto/xts.h>
 #include <asm/unaligned.h>
 
 /*

@@ -68,6 +69,7 @@ struct caam_ctx {
 	struct device *qidev;
 	spinlock_t lock;	/* Protects multiple init of driver context */
 	struct caam_drv_ctx *drv_ctx[NUM_OP];
+	bool xts_key_fallback;
 	struct crypto_skcipher *fallback;
 };
 

@@ -734,11 +736,15 @@ static int xts_skcipher_setkey(struct crypto_skcipher *skcipher, const u8 *key,
 	int ret = 0;
 	int err;
 
-	if (keylen != 2 * AES_MIN_KEY_SIZE  && keylen != 2 * AES_MAX_KEY_SIZE) {
+	err = xts_verify_key(skcipher, key, keylen);
+	if (err) {
 		dev_dbg(jrdev, "key size mismatch\n");
-		return -EINVAL;
+		return err;
 	}
 
+	if (keylen != 2 * AES_KEYSIZE_128 && keylen != 2 * AES_KEYSIZE_256)
+		ctx->xts_key_fallback = true;
+
 	err = crypto_skcipher_setkey(ctx->fallback, key, keylen);
 	if (err)
 		return err;

@@ -1402,7 +1408,8 @@ static inline int skcipher_crypt(struct skcipher_request *req, bool encrypt)
 	if (!req->cryptlen)
 		return 0;
 
-	if (ctx->fallback && xts_skcipher_ivsize(req)) {
+	if (ctx->fallback && (xts_skcipher_ivsize(req) ||
+			      ctx->xts_key_fallback)) {
 		struct caam_skcipher_req_ctx *rctx = skcipher_request_ctx(req);
 
 		skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);