crypto: arm64/sha - fix function types

Instead of casting pointers to callback functions, add C wrappers
to avoid type mismatch failures with Control-Flow Integrity (CFI)
checking.
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm64/crypto/sha1-ce-glue.c

@@ -28,6 +28,13 @@ struct sha1_ce_state {
 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
 				  int blocks);
 
+static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
+				int blocks)
+{
+	sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
+			  blocks);
+}
+
 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
 
@@ -41,8 +48,7 @@ static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
 
 	sctx->finalize = 0;
 	kernel_neon_begin();
-	sha1_base_do_update(desc, data, len,
-			    (sha1_block_fn *)sha1_ce_transform);
+	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
 	kernel_neon_end();
 
 	return 0;
@@ -64,10 +70,9 @@ static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
 	sctx->finalize = finalize;
 
 	kernel_neon_begin();
-	sha1_base_do_update(desc, data, len,
-			    (sha1_block_fn *)sha1_ce_transform);
+	sha1_base_do_update(desc, data, len, __sha1_ce_transform);
 	if (!finalize)
-		sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
+		sha1_base_do_finalize(desc, __sha1_ce_transform);
 	kernel_neon_end();
 	return sha1_base_finish(desc, out);
 }
@@ -81,7 +86,7 @@ static int sha1_ce_final(struct shash_desc *desc, u8 *out)
 
 	sctx->finalize = 0;
 	kernel_neon_begin();
-	sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
+	sha1_base_do_finalize(desc, __sha1_ce_transform);
 	kernel_neon_end();
 	return sha1_base_finish(desc, out);
 }

arch/arm64/crypto/sha2-ce-glue.c

@@ -28,6 +28,13 @@ struct sha256_ce_state {
 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
 				  int blocks);
 
+static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
+				int blocks)
+{
+	sha2_ce_transform(container_of(sst, struct sha256_ce_state, sst), src,
+			  blocks);
+}
+
 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
 					      sst.count);
 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
@@ -35,6 +42,12 @@ const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
 
 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
 
+static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
+				      int blocks)
+{
+	sha256_block_data_order(sst->state, src, blocks);
+}
+
 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
 			    unsigned int len)
 {
@@ -42,12 +55,11 @@ static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
 
 	if (!crypto_simd_usable())
 		return sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
+				__sha256_block_data_order);
 
 	sctx->finalize = 0;
 	kernel_neon_begin();
-	sha256_base_do_update(desc, data, len,
-			      (sha256_block_fn *)sha2_ce_transform);
+	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
 	kernel_neon_end();
 
 	return 0;
@@ -62,9 +74,8 @@ static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
 	if (!crypto_simd_usable()) {
 		if (len)
 			sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
-		sha256_base_do_finalize(desc,
-				(sha256_block_fn *)sha256_block_data_order);
+				__sha256_block_data_order);
+		sha256_base_do_finalize(desc, __sha256_block_data_order);
 		return sha256_base_finish(desc, out);
 	}
 
@@ -75,11 +86,9 @@ static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
 	sctx->finalize = finalize;
 
 	kernel_neon_begin();
-	sha256_base_do_update(desc, data, len,
-			      (sha256_block_fn *)sha2_ce_transform);
+	sha256_base_do_update(desc, data, len, __sha2_ce_transform);
 	if (!finalize)
-		sha256_base_do_finalize(desc,
-					(sha256_block_fn *)sha2_ce_transform);
+		sha256_base_do_finalize(desc, __sha2_ce_transform);
 	kernel_neon_end();
 	return sha256_base_finish(desc, out);
 }
@@ -89,14 +98,13 @@ static int sha256_ce_final(struct shash_desc *desc, u8 *out)
 	struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 
 	if (!crypto_simd_usable()) {
-		sha256_base_do_finalize(desc,
-				(sha256_block_fn *)sha256_block_data_order);
+		sha256_base_do_finalize(desc, __sha256_block_data_order);
 		return sha256_base_finish(desc, out);
 	}
 
 	sctx->finalize = 0;
 	kernel_neon_begin();
-	sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
+	sha256_base_do_finalize(desc, __sha2_ce_transform);
 	kernel_neon_end();
 	return sha256_base_finish(desc, out);
 }

arch/arm64/crypto/sha256-glue.c

@@ -27,14 +27,26 @@ asmlinkage void sha256_block_data_order(u32 *digest, const void *data,
 					unsigned int num_blks);
 EXPORT_SYMBOL(sha256_block_data_order);
 
+static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
+				      int blocks)
+{
+	sha256_block_data_order(sst->state, src, blocks);
+}
+
 asmlinkage void sha256_block_neon(u32 *digest, const void *data,
 				  unsigned int num_blks);
 
+static void __sha256_block_neon(struct sha256_state *sst, u8 const *src,
+				int blocks)
+{
+	sha256_block_neon(sst->state, src, blocks);
+}
+
 static int crypto_sha256_arm64_update(struct shash_desc *desc, const u8 *data,
 				      unsigned int len)
 {
 	return sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
+				     __sha256_block_data_order);
 }
 
 static int crypto_sha256_arm64_finup(struct shash_desc *desc, const u8 *data,
@@ -42,9 +54,8 @@ static int crypto_sha256_arm64_finup(struct shash_desc *desc, const u8 *data,
 {
 	if (len)
 		sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
-	sha256_base_do_finalize(desc,
-				(sha256_block_fn *)sha256_block_data_order);
+				      __sha256_block_data_order);
+	sha256_base_do_finalize(desc, __sha256_block_data_order);
 
 	return sha256_base_finish(desc, out);
 }
@@ -87,7 +98,7 @@ static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
 
 	if (!crypto_simd_usable())
 		return sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
+				__sha256_block_data_order);
 
 	while (len > 0) {
 		unsigned int chunk = len;
@@ -103,8 +114,7 @@ static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
 				sctx->count % SHA256_BLOCK_SIZE;
 
 		kernel_neon_begin();
-		sha256_base_do_update(desc, data, chunk,
-				      (sha256_block_fn *)sha256_block_neon);
+		sha256_base_do_update(desc, data, chunk, __sha256_block_neon);
 		kernel_neon_end();
 		data += chunk;
 		len -= chunk;
@@ -118,15 +128,13 @@ static int sha256_finup_neon(struct shash_desc *desc, const u8 *data,
 	if (!crypto_simd_usable()) {
 		if (len)
 			sha256_base_do_update(desc, data, len,
-				(sha256_block_fn *)sha256_block_data_order);
-		sha256_base_do_finalize(desc,
-				(sha256_block_fn *)sha256_block_data_order);
+				__sha256_block_data_order);
+		sha256_base_do_finalize(desc, __sha256_block_data_order);
 	} else {
 		if (len)
 			sha256_update_neon(desc, data, len);
 		kernel_neon_begin();
-		sha256_base_do_finalize(desc,
-				(sha256_block_fn *)sha256_block_neon);
+		sha256_base_do_finalize(desc, __sha256_block_neon);
 		kernel_neon_end();
 	}
 	return sha256_base_finish(desc, out);

arch/arm64/crypto/sha512-ce-glue.c

@@ -29,16 +29,21 @@ asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
 
 asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
 
+static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
+				      int blocks)
+{
+	sha512_block_data_order(sst->state, src, blocks);
+}
+
 static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
 			    unsigned int len)
 {
 	if (!crypto_simd_usable())
 		return sha512_base_do_update(desc, data, len,
-				(sha512_block_fn *)sha512_block_data_order);
+					     __sha512_block_data_order);
 
 	kernel_neon_begin();
-	sha512_base_do_update(desc, data, len,
-			      (sha512_block_fn *)sha512_ce_transform);
+	sha512_base_do_update(desc, data, len, sha512_ce_transform);
 	kernel_neon_end();
 
 	return 0;
@@ -50,16 +55,14 @@ static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
 	if (!crypto_simd_usable()) {
 		if (len)
 			sha512_base_do_update(desc, data, len,
-				(sha512_block_fn *)sha512_block_data_order);
-		sha512_base_do_finalize(desc,
-				(sha512_block_fn *)sha512_block_data_order);
+					      __sha512_block_data_order);
+		sha512_base_do_finalize(desc, __sha512_block_data_order);
 		return sha512_base_finish(desc, out);
 	}
 
 	kernel_neon_begin();
-	sha512_base_do_update(desc, data, len,
-			      (sha512_block_fn *)sha512_ce_transform);
-	sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
+	sha512_base_do_update(desc, data, len, sha512_ce_transform);
+	sha512_base_do_finalize(desc, sha512_ce_transform);
 	kernel_neon_end();
 	return sha512_base_finish(desc, out);
 }
@@ -67,13 +70,12 @@ static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
 static int sha512_ce_final(struct shash_desc *desc, u8 *out)
 {
 	if (!crypto_simd_usable()) {
-		sha512_base_do_finalize(desc,
-				(sha512_block_fn *)sha512_block_data_order);
+		sha512_base_do_finalize(desc, __sha512_block_data_order);
 		return sha512_base_finish(desc, out);
 	}
 
 	kernel_neon_begin();
-	sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
+	sha512_base_do_finalize(desc, sha512_ce_transform);
 	kernel_neon_end();
 	return sha512_base_finish(desc, out);
 }

arch/arm64/crypto/sha512-glue.c

@@ -20,15 +20,21 @@ MODULE_LICENSE("GPL v2");
 MODULE_ALIAS_CRYPTO("sha384");
 MODULE_ALIAS_CRYPTO("sha512");
 
-asmlinkage void sha512_block_data_order(u32 *digest, const void *data,
+asmlinkage void sha512_block_data_order(u64 *digest, const void *data,
 					unsigned int num_blks);
 EXPORT_SYMBOL(sha512_block_data_order);
 
+static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
+				      int blocks)
+{
+	sha512_block_data_order(sst->state, src, blocks);
+}
+
 static int sha512_update(struct shash_desc *desc, const u8 *data,
 			 unsigned int len)
 {
 	return sha512_base_do_update(desc, data, len,
-			(sha512_block_fn *)sha512_block_data_order);
+				     __sha512_block_data_order);
 }
 
 static int sha512_finup(struct shash_desc *desc, const u8 *data,
@@ -36,9 +42,8 @@ static int sha512_finup(struct shash_desc *desc, const u8 *data,
 {
 	if (len)
 		sha512_base_do_update(desc, data, len,
-			(sha512_block_fn *)sha512_block_data_order);
-	sha512_base_do_finalize(desc,
-			(sha512_block_fn *)sha512_block_data_order);
+				      __sha512_block_data_order);
+	sha512_base_do_finalize(desc, __sha512_block_data_order);
 
 	return sha512_base_finish(desc, out);
 }