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Message-Id: <1491513513-84351-3-git-send-email-keescook@chromium.org>
Date: Thu, 6 Apr 2017 14:18:17 -0700
From: Kees Cook <keescook@...omium.org>
To: kernel-hardening@...ts.openwall.com
Cc: Kees Cook <keescook@...omium.org>,
Michael Leibowitz <michael.leibowitz@...el.com>
Subject: [PATCH 02/18] compiler: Add __designated_init annotation
This allows structure annotations for requiring designated initialization
in GCC 5.1.0 and later:
https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
The structure randomization layout plugin will be using this to help
identify structures that need this form of initialization.
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/linux/compiler-gcc.h | 8 ++++++++
include/linux/compiler.h | 4 ++++
2 files changed, 12 insertions(+)
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 5f4d8f8b75da..cf541e49841e 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -321,6 +321,14 @@
#define __no_sanitize_address __attribute__((no_sanitize_address))
#endif
+#if GCC_VERSION >= 50100
+/*
+ * Mark structures as requiring designated initializers.
+ * https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
+ */
+#define __designated_init __attribute__((designated_init))
+#endif
+
#endif /* gcc version >= 40000 specific checks */
#if !defined(__noclone)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index b8642a3a1f4f..40e584448605 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -440,6 +440,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
# define __attribute_const__ /* unimplemented */
#endif
+#ifndef __designated_init
+# define __designated_init
+#endif
+
#ifndef __latent_entropy
# define __latent_entropy
#endif
--
2.7.4
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