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Message-ID: <20240318130354.2713265-2-aleksander.lobakin@intel.com>
Date: Mon, 18 Mar 2024 14:03:52 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: linux-hardening@...r.kernel.org
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Kees Cook <keescook@...omium.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
Marco Elver <elver@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH RFC kspp-next 1/3] compiler_types: add Endianness-dependent __counted_by_{le,be}
Some structures contain flexible arrays at the end and the counter for
them, but the counter has explicit Endianness and thus __counted_by()
can't be used directly.
To increase test coverage for potential problems without breaking
anything, introduce __counted_by_{le,be} defined depending on platform's
Endianness to either __counted_by() when applicable or noop otherwise.
Maybe it would be a good idea to introduce such attributes on compiler
level if possible, but for now let's stop on what we have.
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
include/linux/compiler_types.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 3e64ec0f7ac8..9506efbf2b8c 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -242,6 +242,17 @@ struct ftrace_likely_data {
*/
#define noinline_for_stack noinline
+/*
+ * Apply __counted_by() when the Endianness matches to increase test coverage.
+ */
+#ifdef __LITTLE_ENDIAN
+#define __counted_by_le(member) __counted_by(member)
+#define __counted_by_be(member)
+#else
+#define __counted_by_le(member)
+#define __counted_by_be(member) __counted_by(member)
+#endif
+
/*
* Sanitizer helper attributes: Because using __always_inline and
* __no_sanitize_* conflict, provide helper attributes that will either expand
--
2.44.0
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