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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Mon, 7 May 2018 15:42:57 +0900
Message-ID: <CAK7LNARS9ZrN=cUaZJkQQHwNc-nuBc6p0YYRhTgGecDbyiWN6g@mail.gmail.com>
Subject: Re: [RFCv2 PATCH 3/3] x86/vdso: Add build salt to the vDSO
To:     Laura Abbott <labbott@redhat.com>
Cc:     Andy Lutomirski <luto@kernel.org>, mjw@fedoraproject.org,
        "H . J . Lu" <hjl.tools@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        X86 ML <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Nick Clifton <nickc@redhat.com>,
        Cary Coutant <ccoutant@gmail.com>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>
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2018-03-30 3:01 GMT+09:00 Laura Abbott <labbott@redhat.com>:
> The vDSO is linked separately from the kernel and modules. Ensure it picks
> up the comment section, if available.
>
> Signed-off-by: Laura Abbott <labbott@redhat.com>
> ---
> v2: Updated name
> ---
>  arch/x86/entry/vdso/vdso-layout.lds.S | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S
> index acfd5ba7d943..7c78dd39aae8 100644
> --- a/arch/x86/entry/vdso/vdso-layout.lds.S
> +++ b/arch/x86/entry/vdso/vdso-layout.lds.S
> @@ -1,5 +1,6 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  #include <asm/vdso.h>
> +#include <generated/build-salt.h>
>
>  /*
>   * Linker script for vDSO.  This is an ELF shared object prelinked to
> @@ -95,6 +96,8 @@ SECTIONS
>         .altinstructions        : { *(.altinstructions) }       :text
>         .altinstr_replacement   : { *(.altinstr_replacement) }  :text
>
> +       BUILD_ID_SALT
> +
>         /DISCARD/ : {
>                 *(.discard)
>                 *(.discard.*)
> --
> 2.16.2
>


For consistency, I think '-T scripts/build-salt.lds'
should be passed to cmd_vdso
in arch/x86/entry/vdso/Makefile.


-- 
Best Regards
Masahiro Yamada