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From cd7620a730413a48843e175d34dc408c152f8125 Mon Sep 17 00:00:00 2001
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From: "H.J. Lu" <hjl.tools@gmail.com>
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Date: Tue, 11 Jan 2022 07:28:25 -0800
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Subject: [PATCH] x86-64: Enable Intel CET
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Intel Control-flow Enforcement Technology (CET):
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https://en.wikipedia.org/wiki/Control-flow_integrity#Intel_Control-flow_Enforcement_Technology
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requires that on Linux, all linker input files are marked as CET enabled
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in .note.gnu.property section. For high-level language source codes,
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.note.gnu.property section is added by compiler with the -fcf-protection
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option. For assembly sources, include <cet.h> to add .note.gnu.property
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section.
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---
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lib/common/portability_macros.h | 11 +++++++++++
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1 file changed, 11 insertions(+)
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diff --git a/lib/common/portability_macros.h b/lib/common/portability_macros.h
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index 627ef9eed4..6ac4b05510 100644
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--- a/lib/common/portability_macros.h
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+++ b/lib/common/portability_macros.h
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@@ -128,4 +128,15 @@
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# define ZSTD_ENABLE_ASM_X86_64_BMI2 0
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#endif
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+/*
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+ * For x86 ELF targets, add .note.gnu.property section for Intel CET in
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+ * assembly sources when CET is enabled.
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+ */
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+#if defined(__ELF__) && (defined(__x86_64__) || defined(__i386__)) \
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+ && defined(__has_include)
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+# if __has_include(<cet.h>)
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+# include <cet.h>
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+# endif
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+#endif
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+
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#endif /* ZSTD_PORTABILITY_MACROS_H */
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