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Subject[PATCH v6 03/29] vmlinux.lds.h: Avoid KASAN and KCSAN's unwanted sections
Date
KASAN (-fsanitize=kernel-address) and KCSAN (-fsanitize=thread)
produce unwanted[1] .eh_frame and .init_array.* sections. Add them to
COMMON_DISCARDS, except with CONFIG_CONSTRUCTORS, which wants to keep
.init_array.* sections.

[1] https://bugs.llvm.org/show_bug.cgi?id=46478

Tested-by: Marco Elver <elver@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
include/asm-generic/vmlinux.lds.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index f1f02a2f71b7..6b89a03e636e 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -954,7 +954,27 @@
EXIT_DATA
#endif

+/*
+ * Clang's -fsanitize=kernel-address and -fsanitize=thread produce
+ * unwanted sections (.eh_frame and .init_array.*), but
+ * CONFIG_CONSTRUCTORS wants to keep any .init_array.* sections.
+ * https://bugs.llvm.org/show_bug.cgi?id=46478
+ */
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KCSAN)
+# ifdef CONFIG_CONSTRUCTORS
+# define SANITIZER_DISCARDS \
+ *(.eh_frame)
+# else
+# define SANITIZER_DISCARDS \
+ *(.init_array) *(.init_array.*) \
+ *(.eh_frame)
+# endif
+#else
+# define SANITIZER_DISCARDS
+#endif
+
#define COMMON_DISCARDS \
+ SANITIZER_DISCARDS \
*(.discard) \
*(.discard.*) \
*(.modinfo) \
--
2.25.1
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