linux-kernel - Re: [PATCH 6/7] modpost: merge sym_update_namespace() into sym_add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 10 Jun 2022 15:26:46 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Nicolas Pitre <npitre@...libre.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-modules <linux-modules@...r.kernel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] modpost: merge sym_update_namespace() into sym_add_exported()

On Fri, Jun 10, 2022 at 11:34 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> Pass a set of the name, license, and namespace to sym_add_exported().
>
> sym_update_namespace() is unneeded.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

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

> ---
>
>  scripts/mod/modpost.c | 41 +++++++++--------------------------------
>  1 file changed, 9 insertions(+), 32 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index f738dddde7b8..0db2cbb74a2a 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -357,26 +357,8 @@ static const char *sec_name_of_symbol(const struct elf_info *info,
>
>  #define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
>
> -static void sym_update_namespace(const char *symname, const char *namespace)
> -{
> -       struct symbol *s = find_symbol(symname);
> -
> -       /*
> -        * That symbol should have been created earlier and thus this is
> -        * actually an assertion.
> -        */
> -       if (!s) {
> -               error("Could not update namespace(%s) for symbol %s\n",
> -                     namespace, symname);
> -               return;
> -       }
> -
> -       free(s->namespace);
> -       s->namespace = namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
> -}
> -
>  static struct symbol *sym_add_exported(const char *name, struct module *mod,
> -                                      bool gpl_only)
> +                                      bool gpl_only, const char *namespace)
>  {
>         struct symbol *s = find_symbol(name);
>
> @@ -389,6 +371,7 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
>         s = alloc_symbol(name);
>         s->module = mod;
>         s->is_gpl_only = gpl_only;
> +       s->namespace = namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
>         list_add_tail(&s->list, &mod->exported_symbols);
>         hash_add_symbol(s);
>
> @@ -658,17 +641,12 @@ static void handle_symbol(struct module *mod, struct elf_info *info,
>                 break;
>         default:
>                 if (sym->st_shndx == info->export_symbol_sec) {
> -                       const char *name;
> -
> -                       if (strstarts(symname, "__export_symbol_gpl.")) {
> -                               name = symname + strlen("__export_symbol_gpl.");
> -                               sym_add_exported(name, mod, true);
> -                               sym_update_namespace(name, sym_get_data(info, sym));
> -                       } else if (strstarts(symname, "__export_symbol.")) {
> -                               name = symname + strlen("__export_symbol.");
> -                               sym_add_exported(name, mod, false);
> -                               sym_update_namespace(name, sym_get_data(info, sym));
> -                       }
> +                       if (strstarts(symname, "__export_symbol_gpl."))
> +                               sym_add_exported(symname + strlen("__export_symbol_gpl."),
> +                                                mod, true, sym_get_data(info, sym));
> +                       else if (strstarts(symname, "__export_symbol."))
> +                               sym_add_exported(symname + strlen("__export_symbol."),
> +                                                mod, false, sym_get_data(info, sym));
>
>                         break;
>                 }
> @@ -2470,9 +2448,8 @@ static void read_dump(const char *fname)
>                         mod = new_module(modname, strlen(modname));
>                         mod->from_dump = true;
>                 }
> -               s = sym_add_exported(symname, mod, gpl_only);
> +               s = sym_add_exported(symname, mod, gpl_only, namespace);
>                 sym_set_crc(s, crc);
> -               sym_update_namespace(symname, namespace);
>         }
>         free(buf);
>         return;
> --
> 2.32.0
>


-- 
Thanks,
~Nick Desaulniers