linux-hardening - Re: [PATCH] tty: Move TIOCSTI toggle variable before kerndoc

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Date:   Sun, 6 Nov 2022 20:58:16 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] tty: Move TIOCSTI toggle variable before kerndoc



On 11/6/22 19:46, Kees Cook wrote:
> The variable "tty_legacy_tiocsti" should be defined before the kerndoc
> for the tiocsti() function. The new variable was breaking the "htmldocs"
> build target:
> 
> drivers/tty/tty_io.c:2271: warning: cannot understand function prototype: 'bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI); '
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Link: https://lore.kernel.org/lkml/20221107143434.66f7be35@canb.auug.org.au
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jirislaby@...nel.org>
> Signed-off-by: Kees Cook <keescook@...omium.org>


Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  drivers/tty/tty_io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index a6a16cf986b7..24ebcb495145 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -2255,6 +2255,7 @@ static int tty_fasync(int fd, struct file *filp, int on)
>  	return retval;
>  }
>  
> +static bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI);
>  /**
>   * tiocsti		-	fake input character
>   * @tty: tty to fake input into
> @@ -2268,7 +2269,6 @@ static int tty_fasync(int fd, struct file *filp, int on)
>   *  * Called functions take tty_ldiscs_lock
>   *  * current->signal->tty check is safe without locks
>   */
> -static bool tty_legacy_tiocsti __read_mostly = IS_ENABLED(CONFIG_LEGACY_TIOCSTI);
>  static int tiocsti(struct tty_struct *tty, char __user *p)
>  {
>  	char ch, mbz = 0;

-- 
~Randy