linux-hardening - [PATCH 07/10] uapi: stddef.h: Introduce __kernel

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Message-Id: <20250207010022.749952-7-kees@kernel.org>
Date: Thu,  6 Feb 2025 17:00:16 -0800
From: Kees Cook <kees@...nel.org>
To: Andy Shevchenko <andy@...nel.org>
Cc: Kees Cook <kees@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Sven Eckelmann <sven@...fation.org>,
	Tadeusz Struk <tadeusz.struk@...aro.org>,
	Erick Archer <erick.archer@...look.com>,
	Dmitry Antipov <dmantipov@...dex.ru>,
	Sathya Prakash <sathya.prakash@...adcom.com>,
	Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
	Suganath Prabu Subramani <suganath-prabu.subramani@...adcom.com>,
	Kashyap Desai <kashyap.desai@...adcom.com>,
	Sumit Saxena <sumit.saxena@...adcom.com>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Nilesh Javali <njavali@...vell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
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Subject: [PATCH 07/10] uapi: stddef.h: Introduce __kernel_nonstring

In order to annotate byte arrays in UAPI that are not C strings (i.e.
they may not be NUL terminated), the "nonstring" attribute is needed.
However, we can't expose this to userspace as it is compiler version
specific.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Sven Eckelmann <sven@...fation.org>
Cc: Tadeusz Struk <tadeusz.struk@...aro.org>
Cc: Erick Archer <erick.archer@...look.com>
Cc: Dmitry Antipov <dmantipov@...dex.ru>
---
 include/uapi/linux/stddef.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/stddef.h b/include/uapi/linux/stddef.h
index 58154117d9b0..0e7d289b7c2e 100644
--- a/include/uapi/linux/stddef.h
+++ b/include/uapi/linux/stddef.h
@@ -63,4 +63,10 @@
 #define __counted_by_be(m)
 #endif
 
+#ifdef __KERNEL__
+#define __kernel_nonstring	__nonstring
+#else
+#define __kernel_nonstring
+#endif
+
 #endif /* _UAPI_LINUX_STDDEF_H */
-- 
2.34.1