linux-kernel - Re: [PATCH v2] vmlinux.lds.h: Keep .ctors.* with .ctors

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Message-ID: <202010141603.49EA0CE@keescook>
Date:   Wed, 14 Oct 2020 16:04:42 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2] vmlinux.lds.h: Keep .ctors.* with .ctors

On Sun, Oct 04, 2020 at 07:57:20PM -0700, Kees Cook wrote:
> Under some circumstances, the compiler generates .ctors.* sections. This
> is seen doing a cross compile of x86_64 from a powerpc64el host:
> 
> x86_64-linux-gnu-ld: warning: orphan section `.ctors.65435' from `kernel/trace/trace_clock.o' being
> placed in section `.ctors.65435'
> x86_64-linux-gnu-ld: warning: orphan section `.ctors.65435' from `kernel/trace/ftrace.o' being
> placed in section `.ctors.65435'
> x86_64-linux-gnu-ld: warning: orphan section `.ctors.65435' from `kernel/trace/ring_buffer.o' being
> placed in section `.ctors.65435'
> 
> Include these orphans along with the regular .ctors section.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Tested-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Fixes: 83109d5d5fba ("x86/build: Warn on orphan section placement")
> Signed-off-by: Kees Cook <keescook@...omium.org>

Ping -- please take this for tip/urgent, otherwise we're drowning sfr in
warnings. :)

-Kees

> ---
> v2: brown paper bag version: fix whitespace for proper backslash alignment
> ---
>  include/asm-generic/vmlinux.lds.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 5430febd34be..b83c00c63997 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -684,6 +684,7 @@
>  #ifdef CONFIG_CONSTRUCTORS
>  #define KERNEL_CTORS()	. = ALIGN(8);			   \
>  			__ctors_start = .;		   \
> +			KEEP(*(SORT(.ctors.*)))		   \
>  			KEEP(*(.ctors))			   \
>  			KEEP(*(SORT(.init_array.*)))	   \
>  			KEEP(*(.init_array))		   \
> -- 
> 2.25.1
> 

-- 
Kees Cook