linux-hardening - Re: [PATCH 21/30] mm: Use kstrtobool() instead of strtobool()

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Message-ID: <CA+CK2bDJjYuO8Xk_8cP874hxDKA5LFhpdbZ+s0SE6bgFPpMg3w@mail.gmail.com>
Date:   Fri, 4 Nov 2022 22:58:20 -0400
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-mm@...ck.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 21/30] mm: Use kstrtobool() instead of strtobool()

On Tue, Nov 1, 2022 at 5:15 PM Christophe JAILLET
<christophe.jaillet@...adoo.fr> wrote:
>
> strtobool() is the same as kstrtobool().
> However, the latter is more used within the kernel.
>
> In order to remove strtobool() and slightly simplify kstrtox.h, switch to
> the other function name.
>
> While at it, include the corresponding header file (<linux/kstrtox.h>)
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch is part of a serie that axes all usages of strtobool().
> Each patch can be applied independently from the other ones.
>
> The last patch of the serie removes the definition of strtobool().
>
> You may not be in copy of the cover letter. So, if needed, it is available
> at [1].
>
> [1]: https://lore.kernel.org/all/cover.1667336095.git.christophe.jaillet@wanadoo.fr/
> ---
>  mm/page_table_check.c | 3 ++-
>  mm/usercopy.c         | 3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/mm/page_table_check.c b/mm/page_table_check.c
> index 433dbce13fe1..93e633c1d587 100644
> --- a/mm/page_table_check.c
> +++ b/mm/page_table_check.c
> @@ -4,6 +4,7 @@
>   * Copyright (c) 2021, Google LLC.
>   * Pasha Tatashin <pasha.tatashin@...een.com>
>   */
> +#include <linux/kstrtox.h>
>  #include <linux/mm.h>
>  #include <linux/page_table_check.h>
>
> @@ -23,7 +24,7 @@ EXPORT_SYMBOL(page_table_check_disabled);
>
>  static int __init early_page_table_check_param(char *buf)
>  {
> -       return strtobool(buf, &__page_table_check_enabled);
> +       return kstrtobool(buf, &__page_table_check_enabled);
>  }

Acked-by: Pasha Tatashin <pasha.tatashin@...een.com>

>
>  early_param("page_table_check", early_page_table_check_param);
> diff --git a/mm/usercopy.c b/mm/usercopy.c
> index c1ee15a98633..4c3164beacec 100644
> --- a/mm/usercopy.c
> +++ b/mm/usercopy.c
> @@ -12,6 +12,7 @@
>
>  #include <linux/mm.h>
>  #include <linux/highmem.h>
> +#include <linux/kstrtox.h>
>  #include <linux/slab.h>
>  #include <linux/sched.h>
>  #include <linux/sched/task.h>
> @@ -258,7 +259,7 @@ static bool enable_checks __initdata = true;
>
>  static int __init parse_hardened_usercopy(char *str)
>  {
> -       if (strtobool(str, &enable_checks))
> +       if (kstrtobool(str, &enable_checks))
>                 pr_warn("Invalid option string for hardened_usercopy: '%s'\n",
>                         str);
>         return 1;
> --
> 2.34.1
>