[PATCH 6.1 0637/1146] crypto: x86/sha1 - fix possible crash with CFI enabled

Greg Kroah-Hartman
2022-12-28T16:19:34Z

From: Eric Biggers <ebiggers@google.com>

[ Upstream commit 32f34bf7e44eeaa241fb845d6f52af5104bc30fd ]

sha1_transform_ssse3(), sha1_transform_avx(), and sha1_ni_transform()
(but not sha1_transform_avx2()) 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: 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/sha1_ni_asm.S | 3 ++-
arch/x86/crypto/sha1_ssse3_asm.S | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/crypto/sha1_ni_asm.S b/arch/x86/crypto/sha1_ni_asm.S
index 2f94ec0e763b..3cae5a1bb3d6 100644
--- a/arch/x86/crypto/sha1_ni_asm.S
+++ b/arch/x86/crypto/sha1_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 */
@@ -93,7 +94,7 @@
*/
.text
.align 32
-SYM_FUNC_START(sha1_ni_transform)
+SYM_TYPED_FUNC_START(sha1_ni_transform)
push %rbp
mov %rsp, %rbp
sub $FRAME_SIZE, %rsp
diff --git a/arch/x86/crypto/sha1_ssse3_asm.S b/arch/x86/crypto/sha1_ssse3_asm.S
index 263f916362e0..f54988c80eb4 100644
--- a/arch/x86/crypto/sha1_ssse3_asm.S
+++ b/arch/x86/crypto/sha1_ssse3_asm.S
@@ -25,6 +25,7 @@
*/

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

#define CTX %rdi // arg1
#define BUF %rsi // arg2
@@ -67,7 +68,7 @@
* param: function's name
*/
.macro SHA1_VECTOR_ASM name
- SYM_FUNC_START(\name)
+ SYM_TYPED_FUNC_START(\name)

push %rbx
push %r12
--
2.35.1