| From | Kees Cook <> | Subject | [PATCH v6 03/29] vmlinux.lds.h: Avoid KASAN and KCSAN's unwanted sections | Date | Fri, 21 Aug 2020 12:42:44 -0700 |
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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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