[PATCH 09/11] crypto: arm64/sm3 - fix possible crash with CFI enabled

Eric Biggers
2022-11-18T09:06:41Z

sm3_neon_transform() is called via indirect function calls. This
function needs to use SYM_TYPED_FUNC_START instead of SYM_FUNC_START to
cause 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 call).

Fixes: c50d32859e70 ("arm64: Add types to indirect called assembly functions")
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
arch/arm64/crypto/sm3-neon-core.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/crypto/sm3-neon-core.S b/arch/arm64/crypto/sm3-neon-core.S
index 3e3b4e5c736fc..8abea1d39ddd9 100644
--- a/arch/arm64/crypto/sm3-neon-core.S
+++ b/arch/arm64/crypto/sm3-neon-core.S
@@ -9,7 +9,7 @@
*/

#include <linux/linkage.h>
-#include <asm/assembler.h>
+#include <linux/cfi_types.h>

/* Context structure */

@@ -351,7 +351,7 @@
*/
.text
.align 3
-SYM_FUNC_START(sm3_neon_transform)
+SYM_TYPED_FUNC_START(sm3_neon_transform)
ldp ra, rb, [RSTATE, #0]
ldp rc, rd, [RSTATE, #8]
ldp re, rf, [RSTATE, #16]