[07/12] crypto: ccp - permit asynchronous skcipher as fallback
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Message ID 20200625124253.1906557-8-ardb@kernel.org
State Superseded
Headers show
Series
  • crypto: permit asynchronous skciphers as driver fallbacks
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Commit Message

Ard Biesheuvel June 25, 2020, 12:42 p.m. UTC
Even though the ccp driver implements an asynchronous version of xts(aes),
the fallback it allocates is required to be synchronous. Given that SIMD
based software implementations are usually asynchronous as well, even
though they rarely complete asynchronously (this typically only happens
in cases where the request was made from softirq context, while SIMD was
already in use in the task context that it interrupted), these
implementations are disregarded, and either the generic C version or
another table based version implemented in assembler is selected instead.

Since falling back to synchronous AES is not only a performance issue, but
potentially a security issue as well (due to the fact that table based AES
is not time invariant), let's fix this, by allocating an ordinary skcipher
as the fallback, and invoke it with the completion routine that was given
to the outer request.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 drivers/crypto/ccp/ccp-crypto-aes-xts.c | 31 ++++++++++----------
 drivers/crypto/ccp/ccp-crypto.h         |  4 ++-
 2 files changed, 18 insertions(+), 17 deletions(-)

Comments

kernel test robot June 25, 2020, 4:24 p.m. UTC | #1
Hi Ard,

I love your patch! Yet something to improve:

[auto build test ERROR on cryptodev/master]
[also build test ERROR on crypto/master sunxi/sunxi/for-next v5.8-rc2 next-20200625]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use  as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Ard-Biesheuvel/crypto-permit-asynchronous-skciphers-as-driver-fallbacks/20200625-204707
base:   https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master
config: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce (this is a W=1 build):
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   drivers/crypto/ccp/ccp-crypto-aes-xts.c: In function 'ccp_aes_xts_exit_tfm':
>> drivers/crypto/ccp/ccp-crypto-aes-xts.c:223:38: error: passing argument 1 of 'crypto_free_sync_skcipher' from incompatible pointer type [-Werror=incompatible-pointer-types]
     223 |  crypto_free_sync_skcipher(ctx->u.aes.tfm_skcipher);
         |                            ~~~~~~~~~~^~~~~~~~~~~~~
         |                                      |
         |                                      struct crypto_skcipher *
   In file included from include/crypto/internal/skcipher.h:12,
                    from include/crypto/xts.h:6,
                    from drivers/crypto/ccp/ccp-crypto-aes-xts.c:16:
   include/crypto/skcipher.h:205:75: note: expected 'struct crypto_sync_skcipher *' but argument is of type 'struct crypto_skcipher *'
     205 | static inline void crypto_free_sync_skcipher(struct crypto_sync_skcipher *tfm)
         |                                              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
   cc1: some warnings being treated as errors

vim +/crypto_free_sync_skcipher +223 drivers/crypto/ccp/ccp-crypto-aes-xts.c

1d6b8a6f64076a Tom Lendacky   2013-11-12  218  
be9fe620af63e7 Ard Biesheuvel 2019-11-09  219  static void ccp_aes_xts_exit_tfm(struct crypto_skcipher *tfm)
1d6b8a6f64076a Tom Lendacky   2013-11-12  220  {
be9fe620af63e7 Ard Biesheuvel 2019-11-09  221  	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
1d6b8a6f64076a Tom Lendacky   2013-11-12  222  
7f28615df88a63 Kees Cook      2018-09-18 @223  	crypto_free_sync_skcipher(ctx->u.aes.tfm_skcipher);
1d6b8a6f64076a Tom Lendacky   2013-11-12  224  }
1d6b8a6f64076a Tom Lendacky   2013-11-12  225  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Patch
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diff --git a/drivers/crypto/ccp/ccp-crypto-aes-xts.c b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
index 04b2517df955..e0fb4e8f22fb 100644
--- a/drivers/crypto/ccp/ccp-crypto-aes-xts.c
+++ b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
@@ -98,7 +98,7 @@  static int ccp_aes_xts_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	ctx->u.aes.key_len = key_len / 2;
 	sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
 
-	return crypto_sync_skcipher_setkey(ctx->u.aes.tfm_skcipher, key, key_len);
+	return crypto_skcipher_setkey(ctx->u.aes.tfm_skcipher, key, key_len);
 }
 
 static int ccp_aes_xts_crypt(struct skcipher_request *req,
@@ -145,20 +145,19 @@  static int ccp_aes_xts_crypt(struct skcipher_request *req,
 	    (ctx->u.aes.key_len != AES_KEYSIZE_256))
 		fallback = 1;
 	if (fallback) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(subreq,
-					       ctx->u.aes.tfm_skcipher);
-
 		/* Use the fallback to process the request for any
 		 * unsupported unit sizes or key sizes
 		 */
-		skcipher_request_set_sync_tfm(subreq, ctx->u.aes.tfm_skcipher);
-		skcipher_request_set_callback(subreq, req->base.flags,
-					      NULL, NULL);
-		skcipher_request_set_crypt(subreq, req->src, req->dst,
-					   req->cryptlen, req->iv);
-		ret = encrypt ? crypto_skcipher_encrypt(subreq) :
-				crypto_skcipher_decrypt(subreq);
-		skcipher_request_zero(subreq);
+		skcipher_request_set_tfm(&rctx->fallback_req,
+					 ctx->u.aes.tfm_skcipher);
+		skcipher_request_set_callback(&rctx->fallback_req,
+					      req->base.flags,
+					      req->base.complete,
+					      req->base.data);
+		skcipher_request_set_crypt(&rctx->fallback_req, req->src,
+					   req->dst, req->cryptlen, req->iv);
+		ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) :
+				crypto_skcipher_decrypt(&rctx->fallback_req);
 		return ret;
 	}
 
@@ -198,13 +197,12 @@  static int ccp_aes_xts_decrypt(struct skcipher_request *req)
 static int ccp_aes_xts_init_tfm(struct crypto_skcipher *tfm)
 {
 	struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
-	struct crypto_sync_skcipher *fallback_tfm;
+	struct crypto_skcipher *fallback_tfm;
 
 	ctx->complete = ccp_aes_xts_complete;
 	ctx->u.aes.key_len = 0;
 
-	fallback_tfm = crypto_alloc_sync_skcipher("xts(aes)", 0,
-					     CRYPTO_ALG_ASYNC |
+	fallback_tfm = crypto_alloc_skcipher("xts(aes)", 0,
 					     CRYPTO_ALG_NEED_FALLBACK);
 	if (IS_ERR(fallback_tfm)) {
 		pr_warn("could not load fallback driver xts(aes)\n");
@@ -212,7 +210,8 @@  static int ccp_aes_xts_init_tfm(struct crypto_skcipher *tfm)
 	}
 	ctx->u.aes.tfm_skcipher = fallback_tfm;
 
-	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx) +
+					 crypto_skcipher_reqsize(fallback_tfm));
 
 	return 0;
 }
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index 90a009e6b5c1..aed3d2192d01 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -89,7 +89,7 @@  static inline struct ccp_crypto_ahash_alg *
 /***** AES related defines *****/
 struct ccp_aes_ctx {
 	/* Fallback cipher for XTS with unsupported unit sizes */
-	struct crypto_sync_skcipher *tfm_skcipher;
+	struct crypto_skcipher *tfm_skcipher;
 
 	enum ccp_engine engine;
 	enum ccp_aes_type type;
@@ -121,6 +121,8 @@  struct ccp_aes_req_ctx {
 	u8 rfc3686_iv[AES_BLOCK_SIZE];
 
 	struct ccp_cmd cmd;
+
+	struct skcipher_request fallback_req;	// keep at the end
 };
 
 struct ccp_aes_cmac_req_ctx {