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Date: Tue,  7 May 2019 09:13:19 -0700
From: Kees Cook <keescook@...omium.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Kees Cook <keescook@...omium.org>,
	Joao Moreira <jmoreira@...e.de>,
	Eric Biggers <ebiggers@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	x86@...nel.org,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: [PATCH v3 5/7] crypto: x86/cast6: Use new glue function macros

From: Joao Moreira <jmoreira@...e.de>

Convert to function declaration macros from function prototype casts
to avoid trigger Control-Flow Integrity checks during indirect function
calls.

Signed-off-by: Joao Moreira <jmoreira@...e.de>
Co-developed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/x86/crypto/cast6_avx_glue.c | 65 +++++++++++++++-----------------
 1 file changed, 31 insertions(+), 34 deletions(-)

diff --git a/arch/x86/crypto/cast6_avx_glue.c b/arch/x86/crypto/cast6_avx_glue.c
index 18965c39305e..4735cd0ef379 100644
--- a/arch/x86/crypto/cast6_avx_glue.c
+++ b/arch/x86/crypto/cast6_avx_glue.c
@@ -35,20 +35,20 @@
 
 #define CAST6_PARALLEL_BLOCKS 8
 
-asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
-				   const u8 *src);
-asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
-				   const u8 *src);
-
-asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
-				   const u8 *src);
-asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
-			       le128 *iv);
-
-asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
-				   const u8 *src, le128 *iv);
-asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
-				   const u8 *src, le128 *iv);
+#define CAST6_GLUE(func)	GLUE_CAST(func, cast6_ctx)
+#define CAST6_GLUE_CBC(func)	GLUE_CAST_CBC(func, cast6_ctx)
+#define CAST6_GLUE_CTR(func)	GLUE_CAST_CTR(func, cast6_ctx)
+#define CAST6_GLUE_XTS(func)	GLUE_CAST_XTS(func, cast6_ctx)
+
+CAST6_GLUE(__cast6_encrypt);
+CAST6_GLUE(__cast6_decrypt);
+CAST6_GLUE(cast6_ecb_enc_8way);
+CAST6_GLUE(cast6_ecb_dec_8way);
+CAST6_GLUE_CBC(cast6_cbc_dec_8way);
+CAST6_GLUE_CBC(__cast6_decrypt);
+CAST6_GLUE_CTR(cast6_ctr_8way);
+CAST6_GLUE_XTS(cast6_xts_enc_8way);
+CAST6_GLUE_XTS(cast6_xts_dec_8way);
 
 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
 				 const u8 *key, unsigned int keylen)
@@ -58,14 +58,12 @@ static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
 
 static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
 {
-	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
-				  GLUE_FUNC_CAST(__cast6_encrypt));
+	glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_encrypt_glue);
 }
 
 static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
 {
-	glue_xts_crypt_128bit_one(ctx, dst, src, iv,
-				  GLUE_FUNC_CAST(__cast6_decrypt));
+	glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_decrypt_glue);
 }
 
 static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
@@ -85,10 +83,10 @@ static const struct common_glue_ctx cast6_enc = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
+		.fn_u = { .ecb = cast6_ecb_enc_8way_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
+		.fn_u = { .ecb = __cast6_encrypt_glue }
 	} }
 };
 
@@ -98,10 +96,10 @@ static const struct common_glue_ctx cast6_ctr = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
+		.fn_u = { .ctr = cast6_ctr_8way_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
+		.fn_u = { .ctr = cast6_crypt_ctr }
 	} }
 };
 
@@ -111,10 +109,10 @@ static const struct common_glue_ctx cast6_enc_xts = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
+		.fn_u = { .xts = cast6_xts_enc_8way_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
+		.fn_u = { .xts = cast6_xts_enc }
 	} }
 };
 
@@ -124,10 +122,10 @@ static const struct common_glue_ctx cast6_dec = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
+		.fn_u = { .ecb = cast6_ecb_dec_8way_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
+		.fn_u = { .ecb = __cast6_decrypt_glue }
 	} }
 };
 
@@ -137,10 +135,10 @@ static const struct common_glue_ctx cast6_dec_cbc = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
+		.fn_u = { .cbc = cast6_cbc_dec_8way_cbc_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
+		.fn_u = { .cbc = __cast6_decrypt_cbc_glue }
 	} }
 };
 
@@ -150,10 +148,10 @@ static const struct common_glue_ctx cast6_dec_xts = {
 
 	.funcs = { {
 		.num_blocks = CAST6_PARALLEL_BLOCKS,
-		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
+		.fn_u = { .xts = cast6_xts_dec_8way_glue }
 	}, {
 		.num_blocks = 1,
-		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
+		.fn_u = { .xts = cast6_xts_dec }
 	} }
 };
 
@@ -169,8 +167,7 @@ static int ecb_decrypt(struct skcipher_request *req)
 
 static int cbc_encrypt(struct skcipher_request *req)
 {
-	return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__cast6_encrypt),
-					   req);
+	return glue_cbc_encrypt_req_128bit(__cast6_encrypt_glue, req);
 }
 
 static int cbc_decrypt(struct skcipher_request *req)
@@ -215,7 +212,7 @@ static int xts_encrypt(struct skcipher_request *req)
 	struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 
 	return glue_xts_req_128bit(&cast6_enc_xts, req,
-				   XTS_TWEAK_CAST(__cast6_encrypt),
+				   __cast6_encrypt_glue,
 				   &ctx->tweak_ctx, &ctx->crypt_ctx);
 }
 
@@ -225,7 +222,7 @@ static int xts_decrypt(struct skcipher_request *req)
 	struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 
 	return glue_xts_req_128bit(&cast6_dec_xts, req,
-				   XTS_TWEAK_CAST(__cast6_encrypt),
+				   __cast6_encrypt_glue,
 				   &ctx->tweak_ctx, &ctx->crypt_ctx);
 }
 
-- 
2.17.1

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