linux-kernel - Re: [PATCH v5 05/21] modpost: squash report_sec_mismatch() into default_mismatch

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Message-ID: <CAKwvOdmbhZKQZoatBgcFdm7zQR74CaiAo5nn+WZLuqeb3vSNZQ@mail.gmail.com>
Date:   Wed, 17 May 2023 14:53:50 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nicolas Pitre <npitre@...libre.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: Re: [PATCH v5 05/21] modpost: squash report_sec_mismatch() into default_mismatch_handler()

On Sun, May 14, 2023 at 8:28 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> report_sec_mismatch() and default_mismatch_handler() are small enough
> to be merged together.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

> ---
>
>  scripts/mod/modpost.c | 55 ++++++++++++++++---------------------------
>  1 file changed, 20 insertions(+), 35 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 7a9a3ef8ca0d..bb7d1d87bae7 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -1207,17 +1207,27 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
>         return near;
>  }
>
> -/*
> - * Print a warning about a section mismatch.
> - * Try to find symbols near it so user can find it.
> - * Check whitelist before warning - it may be a false positive.
> - */
> -static void report_sec_mismatch(const char *modname,
> -                               const struct sectioncheck *mismatch,
> -                               const char *fromsec,
> -                               const char *fromsym,
> -                               const char *tosec, const char *tosym)
> +static void default_mismatch_handler(const char *modname, struct elf_info *elf,
> +                                    const struct sectioncheck* const mismatch,
> +                                    Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
>  {
> +       const char *tosec;
> +       Elf_Sym *to;
> +       Elf_Sym *from;
> +       const char *tosym;
> +       const char *fromsym;
> +
> +       from = find_elf_symbol2(elf, r->r_offset, fromsec);
> +       fromsym = sym_name(elf, from);
> +
> +       tosec = sec_name(elf, get_secindex(elf, sym));
> +       to = find_elf_symbol(elf, r->r_addend, sym);
> +       tosym = sym_name(elf, to);
> +
> +       /* check whitelist - we may ignore it */
> +       if (!secref_whitelist(mismatch, fromsec, fromsym, tosec, tosym))
> +               return;
> +
>         sec_mismatch_count++;
>
>         switch (mismatch->mismatch) {
> @@ -1242,31 +1252,6 @@ static void report_sec_mismatch(const char *modname,
>         }
>  }
>
> -static void default_mismatch_handler(const char *modname, struct elf_info *elf,
> -                                    const struct sectioncheck* const mismatch,
> -                                    Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
> -{
> -       const char *tosec;
> -       Elf_Sym *to;
> -       Elf_Sym *from;
> -       const char *tosym;
> -       const char *fromsym;
> -
> -       from = find_elf_symbol2(elf, r->r_offset, fromsec);
> -       fromsym = sym_name(elf, from);
> -
> -       tosec = sec_name(elf, get_secindex(elf, sym));
> -       to = find_elf_symbol(elf, r->r_addend, sym);
> -       tosym = sym_name(elf, to);
> -
> -       /* check whitelist - we may ignore it */
> -       if (secref_whitelist(mismatch,
> -                            fromsec, fromsym, tosec, tosym)) {
> -               report_sec_mismatch(modname, mismatch,
> -                                   fromsec, fromsym, tosec, tosym);
> -       }
> -}
> -
>  static int is_executable_section(struct elf_info* elf, unsigned int section_index)
>  {
>         if (section_index > elf->num_sections)
> --
> 2.39.2
>


-- 
Thanks,
~Nick Desaulniers