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SubjectRe: [PATCH v5 mips-next 8/9] vmlinux.lds.h: catch UBSAN's "unnamed data" into data
On Sun, Jan 10, 2021 at 11:56:54AM +0000, Alexander Lobakin wrote:
> When building kernel with both LD_DEAD_CODE_DATA_ELIMINATION and
> UBSAN, LLVM stack generates lots of "unnamed data" sections:
>
> ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_2)
> is being placed in '.data.$__unnamed_2'
> ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_3)
> is being placed in '.data.$__unnamed_3'
> ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_4)
> is being placed in '.data.$__unnamed_4'
> ld.lld: warning: net/built-in.a(netfilter/utils.o): (.data.$__unnamed_5)
> is being placed in '.data.$__unnamed_5'
>
> [...]
>
> Also handle this by adding the related sections to generic definitions.
>
> Signed-off-by: Alexander Lobakin <alobakin@pm.me>

Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

> ---
> include/asm-generic/vmlinux.lds.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 5f2f5b1db84f..cc659e77fcb0 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -95,7 +95,7 @@
> */
> #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
> #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
> -#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral*
> +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* .data.$__unnamed_*
> #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
> #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L*
> #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral*
> --
> 2.30.0
>
>

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