linux-kernel - [PATCH -next V17 1/7] compiler_types.h: Add __noinstr

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Date:   Tue, 21 Feb 2023 22:30:15 -0500
From:   guoren@...nel.org
To:     arnd@...db.de, guoren@...nel.org, palmer@...osinc.com,
        tglx@...utronix.de, peterz@...radead.org, luto@...nel.org,
        conor.dooley@...rochip.com, heiko@...ech.de, jszhang@...nel.org,
        lazyparser@...il.com, falcon@...ylab.org, chenhuacai@...nel.org,
        apatel@...tanamicro.com, atishp@...shpatra.org,
        mark.rutland@....com, ben@...adent.org.uk, bjorn@...nel.org,
        palmer@...belt.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Björn Töpel <bjorn@...osinc.com>
Subject: [PATCH -next V17 1/7] compiler_types.h: Add __noinstr_section() for noinstr

From: Lai Jiangshan <laijs@...ux.alibaba.com>

Using __noinstr_section() doesn't automatically disable all
instrumentations on the section. Inhibition for some
instrumentations requires extra code. I.E. KPROBES explicitly
avoids instrumenting on .noinstr.text.

Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Peter Zijlstra <peterz@...radead.org>
Reviewed-by: Miguel Ojeda <ojeda@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Björn Töpel <bjorn@...osinc.com>
Tested-by: Jisheng Zhang <jszhang@...nel.org>
Tested-by: Guo Ren <guoren@...nel.org>
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 include/linux/compiler_types.h | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 7c1afe0f4129..0a2ca5755be7 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -231,12 +231,19 @@ struct ftrace_likely_data {
 #define __no_sanitize_or_inline __always_inline
 #endif
 
-/* Section for code which can't be instrumented at all */
-#define noinstr								\
-	noinline notrace __attribute((__section__(".noinstr.text")))	\
-	__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \
+/*
+ * Using __noinstr_section() doesn't automatically disable all instrumentations
+ * on the section.  Inhibition for some instrumentations requires extra code.
+ * I.E. KPROBES explicitly avoids instrumenting on .noinstr.text.
+ */
+#define __noinstr_section(section)				\
+	noinline notrace __section(section) __no_profile	\
+	__no_kcsan __no_sanitize_address __no_sanitize_coverage	\
 	__no_sanitize_memory
 
+/* Section for code which can't be instrumented at all */
+#define noinstr __noinstr_section(".noinstr.text")
+
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */
-- 
2.36.1