crypto: x86/sha256 - fix possible crash with CFI enabled

sha256_transform_ssse3(), sha256_transform_avx(),
sha256_transform_rorx(), and sha256_ni_transform() are called via
indirect function calls.  Therefore they need to use
SYM_TYPED_FUNC_START instead of SYM_FUNC_START to cause their type
hashes to be emitted when the kernel is built with CONFIG_CFI_CLANG=y.
Otherwise, the code crashes with a CFI failure (if the compiler didn't
happen to optimize out the indirect calls).

Fixes: ccace936 ("x86: Add types to indirectly called assembly functions")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/sha256-avx-asm.S

@@ -48,6 +48,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 ## assume buffers not aligned
 #define    VMOVDQ vmovdqu
@@ -346,7 +347,7 @@ a = TMP_
 ## arg 3 : Num blocks
 ########################################################################
 .text
-SYM_FUNC_START(sha256_transform_avx)
+SYM_TYPED_FUNC_START(sha256_transform_avx)
 .align 32
 	pushq   %rbx
 	pushq   %r12

arch/x86/crypto/sha256-avx2-asm.S

@@ -49,6 +49,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 ## assume buffers not aligned
 #define	VMOVDQ vmovdqu
@@ -523,7 +524,7 @@ STACK_SIZE	= _CTX      + _CTX_SIZE
 ## arg 3 : Num blocks
 ########################################################################
 .text
-SYM_FUNC_START(sha256_transform_rorx)
+SYM_TYPED_FUNC_START(sha256_transform_rorx)
 .align 32
 	pushq	%rbx
 	pushq	%r12

arch/x86/crypto/sha256-ssse3-asm.S

@@ -47,6 +47,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 ## assume buffers not aligned
 #define    MOVDQ movdqu
@@ -355,7 +356,7 @@ a = TMP_
 ## arg 3 : Num blocks
 ########################################################################
 .text
-SYM_FUNC_START(sha256_transform_ssse3)
+SYM_TYPED_FUNC_START(sha256_transform_ssse3)
 .align 32
 	pushq   %rbx
 	pushq   %r12

arch/x86/crypto/sha256_ni_asm.S

@@ -54,6 +54,7 @@
  */
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 #define DIGEST_PTR	%rdi	/* 1st arg */
 #define DATA_PTR	%rsi	/* 2nd arg */
@@ -97,7 +98,7 @@
 
 .text
 .align 32
-SYM_FUNC_START(sha256_ni_transform)
+SYM_TYPED_FUNC_START(sha256_ni_transform)
 
 	shl		$6, NUM_BLKS		/*  convert to bytes */
 	jz		.Ldone_hash