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[PATCH v2 03/20] compiler: Add __designated_init annotation

From Kees Cook <keescook@chromium.org>
Newsgroups linux.kernel
Subject [PATCH v2 03/20] compiler: Add __designated_init annotation
Date 2017-05-27 04:00 +0200
Message-ID <tLzbj-55K-7@gated-at.bofh.it> (permalink)
References <tLyyB-4R7-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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@chromium.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 0efef9cf014f..386caf6771ed 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -294,6 +294,14 @@
 #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 707242fdbb89..bbe881054bf0 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -436,6 +436,10 @@ 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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[PATCH v2 00/20] Introduce struct layout randomization plugin Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
  [PATCH v2 06/20] randstruct: Whitelist UNIXCB cast Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
    Re: [PATCH v2 06/20] randstruct: Whitelist UNIXCB cast Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
    Re: [PATCH v2 06/20] randstruct: Whitelist UNIXCB cast Christoph Hellwig <hch@infradead.org> - 2017-05-28 10:00 +0200
  [PATCH v2 13/20] drm/amdgpu: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
  [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads cast Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
    Re: [PATCH v2 05/20] randstruct: Whitelist struct  security_hook_heads cast Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:50 +0200
      Re: [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads cast Kees Cook <keescook@chromium.org> - 2017-05-27 22:20 +0200
        Re: [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads cast Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-05-28 00:10 +0200
          Re: [kernel-hardening] Re: [PATCH v2 05/20] randstruct: Whitelist  struct security_hook_heads cast Kees Cook <keescook@chromium.org> - 2017-05-28 02:50 +0200
        Re: [PATCH v2 05/20] randstruct: Whitelist struct security_hook_heads  cast James Morris <jmorris@namei.org> - 2017-05-30 12:40 +0200
  [PATCH v2 02/20] gcc-plugins: Detail c-common.h location for GCC 4.6 Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
  [PATCH v2 11/20] randstruct: Disable randomization of ACPICA structs Kees Cook <keescook@chromium.org> - 2017-05-27 03:20 +0200
    Re: [PATCH v2 11/20] randstruct: Disable randomization of ACPICA  structs Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:50 +0200
      Re: [PATCH v2 11/20] randstruct: Disable randomization of ACPICA structs Kees Cook <keescook@chromium.org> - 2017-05-27 22:10 +0200
        Re: [PATCH v2 11/20] randstruct: Disable randomization of ACPICA  structs Christoph Hellwig <hch@infradead.org> - 2017-05-28 07:00 +0200
  Re: [PATCH v2 19/20] [RFC] task_struct: Allow randomized layout Kees Cook <keescook@chromium.org> - 2017-05-27 03:30 +0200
  Re: [PATCH v2 19/20] [RFC] task_struct: Allow randomized layout Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-27 03:30 +0200
  [PATCH v2 15/20] mtk-vcodec: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
  [PATCH v2 14/20] drm/amd/powerplay: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
    Re: [PATCH v2 14/20] drm/amd/powerplay: Use designated initializers Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:50 +0200
      Re: [PATCH v2 14/20] drm/amd/powerplay: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 22:20 +0200
  [PATCH v2 20/20] ACPICA: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
    Re: [PATCH v2 20/20] ACPICA: Use designated initializers Christoph Hellwig <hch@infradead.org> - 2017-05-28 09:50 +0200
  [PATCH v2 18/20] randstruct: Enable function pointer struct detection Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
  [PATCH v2 16/20] ntfs: Use ERR_CAST() to avoid cross-structure cast Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
  [PATCH v2 17/20] ocfs2: Use ERR_CAST() to avoid cross-structure cast Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
  [PATCH v2 19/20] [RFC] task_struct: Allow randomized layout Kees Cook <keescook@chromium.org> - 2017-05-27 03:50 +0200
  [PATCH v2 10/20] randstruct: opt-out externally exposed function pointer structs Kees Cook <keescook@chromium.org> - 2017-05-27 04:00 +0200
  [PATCH v2 12/20] sgi-xp: Use designated initializers Kees Cook <keescook@chromium.org> - 2017-05-27 04:00 +0200
    Re: [PATCH v2 12/20] sgi-xp: Use designated initializers Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:50 +0200
  [PATCH v2 01/20] NFS: Avoid cross-structure casting Kees Cook <keescook@chromium.org> - 2017-05-27 04:00 +0200
    Re: [PATCH v2 01/20] NFS: Avoid cross-structure casting Christoph Hellwig <hch@infradead.org> - 2017-05-28 10:00 +0200
      Re: [PATCH v2 01/20] NFS: Avoid cross-structure casting Kees Cook <keescook@chromium.org> - 2017-05-28 19:00 +0200
  [PATCH v2 03/20] compiler: Add __designated_init annotation Kees Cook <keescook@chromium.org> - 2017-05-27 04:00 +0200
  [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading Kees Cook <keescook@chromium.org> - 2017-05-27 04:00 +0200
    Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page  overloading Christoph Hellwig <hch@infradead.org> - 2017-05-28 10:20 +0200
      Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading Kees Cook <keescook@chromium.org> - 2017-05-28 19:40 +0200
      Re: [PATCH v2 08/20] randstruct: Whitelist NIU struct page overloading Kees Cook <keescook@chromium.org> - 2017-05-28 19:40 +0200

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