KASAN (-fsanitize=kernel-address) and KCSAN (-fsanitize=thread) produce unwanted[1] .eh_frame and .init_array.* sections. Add them to DISCARDS, except with CONFIG_CONSTRUCTORS, which wants to keep .init_array.* sections.
[1] https://bugs.llvm.org/show_bug.cgi?id=46478 Signed-off-by: Kees Cook <[email protected]> --- 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 1248a206be8d..e53a2d4f47f6 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -927,10 +927,30 @@ 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 KASAN_DISCARDS \ + *(.eh_frame) +# else +# define KASAN_DISCARDS \ + *(.init_array) *(.init_array.*) \ + *(.eh_frame) +# endif +#else +# define KASAN_DISCARDS +#endif + #define DISCARDS \ /DISCARD/ : { \ EXIT_DISCARDS \ EXIT_CALL \ + KASAN_DISCARDS \ *(.discard) \ *(.discard.*) \ *(.modinfo) \ -- 2.25.1
