linux-kernel - Re: [PATCH v2 1/2] printk: Check valid console index for preferred console

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Message-ID: <20231012062448.GF34982@atomide.com>
Date:   Thu, 12 Oct 2023 09:24:48 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] printk: Check valid console index for preferred
 console

* Jiri Slaby <jirislaby@...nel.org> [231012 05:54]:
> On 11. 10. 23, 9:43, Tony Lindgren wrote:
> > Let's check for valid console index values to avoid bogus console index
> > numbers from kernel command line. While struct console uses short for
> > index, and negative index values are used by some device drivers, we do
> > not want to allow negative values for preferred console.
> > 
> > Let's change the idx to short to match struct console, and return an error
> > on negative values. And let's also constify idx while at it.
> > 
> > Signed-off-by: Tony Lindgren <tony@...mide.com>
> ...
> > --- a/kernel/printk/printk.c
> > +++ b/kernel/printk/printk.c
> > @@ -2404,12 +2404,19 @@ static void set_user_specified(struct console_cmdline *c, bool user_specified)
> >   	console_set_on_cmdline = 1;
> >   }
> > -static int __add_preferred_console(char *name, int idx, char *options,
> > +static int __add_preferred_console(const char *name, const short idx, char *options,
> 
> This "const char *name" change is somehow not related to 1/2, but to 2/2, I
> suppose.

Thanks I just noticed that too, that sneaked in while I was resolving a
merge conflict while changing the order of the two patches.

Regards,

Tony