crypto: x86/sha1 - fix possible crash with CFI enabled

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>

diff --git a/arch/x86/crypto/sha1_ni_asm.S b/arch/x86/crypto/sha1_ni_asm.S
index 2f94ec0..3cae5a1 100644 (file)
--- 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 263f916..f54988c 100644 (file)
--- 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