[PATCH 08/11] crypto: arm64/nhpoly1305 - eliminate unnecessary CFI wrapper

Eric Biggers
2022-11-18T09:04:49Z

Since the CFI implementation now supports indirect calls to assembly
functions, take advantage of that rather than use a wrapper function.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
arch/arm64/crypto/nh-neon-core.S | 5 +++--
arch/arm64/crypto/nhpoly1305-neon-glue.c | 11 ++---------
2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/crypto/nh-neon-core.S b/arch/arm64/crypto/nh-neon-core.S
index 51c0a534ef87c..13eda08fda1e5 100644
--- a/arch/arm64/crypto/nh-neon-core.S
+++ b/arch/arm64/crypto/nh-neon-core.S
@@ -8,6 +8,7 @@
*/

#include <linux/linkage.h>
+#include <linux/cfi_types.h>

KEY .req x0
MESSAGE .req x1
@@ -58,11 +59,11 @@

/*
* void nh_neon(const u32 *key, const u8 *message, size_t message_len,
- * u8 hash[NH_HASH_BYTES])
+ * __le64 hash[NH_NUM_PASSES])
*
* It's guaranteed that message_len % 16 == 0.
*/
-SYM_FUNC_START(nh_neon)
+SYM_TYPED_FUNC_START(nh_neon)

ld1 {K0.4s,K1.4s}, [KEY], #32
movi PASS0_SUMS.2d, #0
diff --git a/arch/arm64/crypto/nhpoly1305-neon-glue.c b/arch/arm64/crypto/nhpoly1305-neon-glue.c
index c5405e6a6db76..cd882c35d9252 100644
--- a/arch/arm64/crypto/nhpoly1305-neon-glue.c
+++ b/arch/arm64/crypto/nhpoly1305-neon-glue.c
@@ -14,14 +14,7 @@
#include <linux/module.h>

asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len,
- u8 hash[NH_HASH_BYTES]);
-
-/* wrapper to avoid indirect call to assembly, which doesn't work with CFI */
-static void _nh_neon(const u32 *key, const u8 *message, size_t message_len,
- __le64 hash[NH_NUM_PASSES])
-{
- nh_neon(key, message, message_len, (u8 *)hash);
-}
+ __le64 hash[NH_NUM_PASSES]);

static int nhpoly1305_neon_update(struct shash_desc *desc,
const u8 *src, unsigned int srclen)
@@ -33,7 +26,7 @@ static int nhpoly1305_neon_update(struct shash_desc *desc,
unsigned int n = min_t(unsigned int, srclen, SZ_4K);

kernel_neon_begin();
- crypto_nhpoly1305_update_helper(desc, src, n, _nh_neon);
+ crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
kernel_neon_end();
src += n;
srclen -= n;
--
2.38.1