linux-kernel - Re: [PATCH] modpost: simplify sec

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Message-ID: <CAGXu5j+WNt8_aL4tfVQ8KSnFZjRfPY2_tjScOo3xvJWoVeCsRA@mail.gmail.com>
Date:   Tue, 8 Aug 2017 22:17:06 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Jessica Yu <jeyu@...hat.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Ingo Molnar <mingo@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] modpost: simplify sec_name()

On Tue, Aug 8, 2017 at 8:18 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> There is code duplication between sec_name() and sech_name().
> Simplify sec_name() by re-using sech_name().  Also, move them up
> to remove the forward declaration of sec_name().
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>
>  scripts/mod/modpost.c | 27 +++++++++++----------------
>  1 file changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 48397feb08fb..b920d186ad4a 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -261,7 +261,17 @@ static enum export export_no(const char *s)
>         return export_unknown;
>  }
>
> -static const char *sec_name(struct elf_info *elf, int secindex);
> +static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
> +{
> +       return (void *)elf->hdr +
> +               elf->sechdrs[elf->secindex_strings].sh_offset +
> +               sechdr->sh_name;
> +}
> +
> +static const char *sec_name(struct elf_info *elf, int secindex)
> +{
> +       return sech_name(elf, &elf->sechdrs[secindex]);
> +}
>
>  #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
>
> @@ -775,21 +785,6 @@ static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
>                 return "(unknown)";
>  }
>
> -static const char *sec_name(struct elf_info *elf, int secindex)
> -{
> -       Elf_Shdr *sechdrs = elf->sechdrs;
> -       return (void *)elf->hdr +
> -               elf->sechdrs[elf->secindex_strings].sh_offset +
> -               sechdrs[secindex].sh_name;
> -}
> -
> -static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
> -{
> -       return (void *)elf->hdr +
> -               elf->sechdrs[elf->secindex_strings].sh_offset +
> -               sechdr->sh_name;
> -}
> -
>  /* The pattern is an array of simple patterns.
>   * "foo" will match an exact string equal to "foo"
>   * "*foo" will match a string that ends with "foo"
> --
> 2.7.4
>



-- 
Kees Cook
Pixel Security