[PATCH 3/4] Compiler Attributes: Add __diagnose_as

[Kees Cook]

Clang will perform various compile-time diagnostics on uses of various
functions (e.g. simple bounds-checking on strcpy(), etc). These
diagnostics can be assigned to other functions (for example, new
implementations of the string functions under CONFIG_FORTIFY_SOURCE)
using the "diagnose_as_builtin" attribute. This allows those functions
to retain their compile-time diagnostic warnings.

Cc: Miguel Ojeda <ojeda at kernel.org>
Cc: Nick Desaulniers <ndesaulniers at google.com>
Cc: Nathan Chancellor <nathan at kernel.org>
Cc: llvm at lists.linux.dev
Signed-off-by: Kees Cook <keescook at chromium.org>
---
 include/linux/compiler_attributes.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h
index 51e063347fd6..b4ae0d771302 100644
--- a/include/linux/compiler_attributes.h
+++ b/include/linux/compiler_attributes.h
@@ -100,6 +100,15 @@
 # define __copy(symbol)
 #endif
 
+/*
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#diagnose_as_builtin
+ */
+#if __has_attribute(__diagnose_as_builtin__)
+# define __diagnose_as(builtin...)	__attribute__((__diagnose_as_builtin__(builtin)))
+#else
+# define __diagnose_as(builtin...)
+#endif
+
 /*
  * Don't. Just don't. See commit 771c035372a0 ("deprecate the '__deprecated'
  * attribute warnings entirely and for good") for more information.
-- 
2.30.2