linux-kernel - Re: [PATCH v2 2/4] printk/kdb: Handle more message headers

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Date:   Fri, 11 Nov 2016 12:35:13 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jason Wessel <jason.wessel@...driver.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] printk/kdb: Handle more message headers

On Wed,  9 Nov 2016 13:41:29 +0100
Petr Mladek <pmladek@...e.com> wrote:

> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index eac1af8502bb..a0859e169bc3 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -31,6 +31,14 @@ static inline const char *printk_skip_level(const char *buffer)
>  	return buffer;
>  }
>  
> +static inline const char *printk_skip_headers(const char *buffer)
> +{
> +	while (printk_get_level(buffer))
> +		buffer = printk_skip_level(buffer);

Hmm, shouldn't there be a length passed in here. What happens if buffer
ends with a header. Can't this overflow?

-- Steve

> +
> +	return buffer;
> +}
> +
>  #define CONSOLE_EXT_LOG_MAX	8192
>