[PATCH 6.1 0640/1146] crypto: x86/sm3 - fix possible crash with CFI enabled

Greg Kroah-Hartman
2022-12-28T16:20:22Z

From: Eric Biggers <ebiggers@google.com>

[ Upstream commit 8ba490d9f5a56f52091644325a32d3f71a982776 ]

sm3_transform_avx() is called via indirect function calls. Therefore it
needs to use SYM_TYPED_FUNC_START instead of SYM_FUNC_START to cause its
type hash 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: ccace936eec7 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/crypto/sm3-avx-asm_64.S | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/crypto/sm3-avx-asm_64.S b/arch/x86/crypto/sm3-avx-asm_64.S
index b12b9efb5ec5..8fc5ac681fd6 100644
--- a/arch/x86/crypto/sm3-avx-asm_64.S
+++ b/arch/x86/crypto/sm3-avx-asm_64.S
@@ -12,6 +12,7 @@
*/

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

/* Context structure */
@@ -328,7 +329,7 @@
* const u8 *data, int nblocks);
*/
.align 16
-SYM_FUNC_START(sm3_transform_avx)
+SYM_TYPED_FUNC_START(sm3_transform_avx)
/* input:
* %rdi: ctx, CTX
* %rsi: data (64*nblks bytes)
--
2.35.1