crypto: arm/crc32 - add kCFI annotations to asm routines

The crc32/crc32c implementations using the scalar CRC32 instructions are
accessed via indirect calls, and so they must be annotated with type ids
in order to execute correctly when kCFI is enabled.

Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: ardbiesheuvel

arch/arm/crypto/crc32-ce-core.S

@@ -48,6 +48,7 @@
  */
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 #include <asm/assembler.h>
 
 	.text
@@ -123,11 +124,12 @@
 	 * uint crc32_pmull_le(unsigned char const *buffer,
 	 *                     size_t len, uint crc32)
 	 */
-ENTRY(crc32_pmull_le)
+SYM_FUNC_START(crc32_pmull_le)
 	adr		r3, .Lcrc32_constants
 	b		0f
+SYM_FUNC_END(crc32_pmull_le)
 
-ENTRY(crc32c_pmull_le)
+SYM_FUNC_START(crc32c_pmull_le)
 	adr		r3, .Lcrc32c_constants
 
 0:	bic		LEN, LEN, #15
@@ -236,8 +238,7 @@ fold_64:
 	vmov		r0, s5
 
 	bx		lr
-ENDPROC(crc32_pmull_le)
-ENDPROC(crc32c_pmull_le)
+SYM_FUNC_END(crc32c_pmull_le)
 
 	.macro		__crc32, c
 	subs		ip, r2, #8
@@ -296,11 +297,11 @@ ARM_BE8(rev16		r3, r3		)
 	.endm
 
 	.align		5
-ENTRY(crc32_armv8_le)
+SYM_TYPED_FUNC_START(crc32_armv8_le)
 	__crc32
-ENDPROC(crc32_armv8_le)
+SYM_FUNC_END(crc32_armv8_le)
 
 	.align		5
-ENTRY(crc32c_armv8_le)
+SYM_TYPED_FUNC_START(crc32c_armv8_le)
 	__crc32		c
-ENDPROC(crc32c_armv8_le)
+SYM_FUNC_END(crc32c_armv8_le)