From: Kees Cook <keescook@chromium.org>
To: Kees Cook <keescook@chromium.org>
Cc: Miguel Ojeda <ojeda@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nathan Chancellor <nathan@kernel.org>,
llvm@lists.linux.dev, George Burgess IV <gbiv@google.com>,
linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
linux-security-module@vger.kernel.org
Subject: [PATCH 3/4] Compiler Attributes: Add __diagnose_as
Date: Tue, 1 Feb 2022 16:30:32 -0800 [thread overview]
Message-ID: <20220202003033.704951-4-keescook@chromium.org> (raw)
In-Reply-To: <20220202003033.704951-1-keescook@chromium.org>
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@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: llvm@lists.linux.dev
Signed-off-by: Kees Cook <keescook@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
next prev parent reply other threads:[~2022-02-02 0:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-02 0:30 [PATCH 0/4 v5] fortify: Add Clang support Kees Cook
2022-02-02 0:30 ` [PATCH 1/4] Compiler Attributes: Add Clang's __pass_object_size Kees Cook
2022-02-02 1:11 ` Miguel Ojeda
2022-02-02 1:13 ` Miguel Ojeda
2022-02-02 21:09 ` Kees Cook
2022-02-02 21:19 ` Miguel Ojeda
2022-02-02 0:30 ` [PATCH 2/4] Compiler Attributes: Add __overloadable Kees Cook
2022-02-02 0:30 ` Kees Cook [this message]
2022-02-02 0:30 ` [PATCH 4/4 v5] fortify: Add Clang support Kees Cook
2022-02-02 21:22 ` Nick Desaulniers
2022-02-03 3:15 ` Kees Cook
2022-02-02 21:27 ` Nick Desaulniers
2022-02-03 3:18 ` Kees Cook
2022-02-03 22:13 ` Nick Desaulniers
2022-02-03 22:28 ` Miguel Ojeda
2022-02-04 0:28 ` Kees Cook
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