linux-kernel - Re: [PATCH] kconfig: Add kernel config option for fuzz testing.

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Message-ID: <20191217051234.GA54407@google.com>
Date:   Tue, 17 Dec 2019 14:12:34 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] kconfig: Add kernel config option for fuzz testing.

On (19/12/16 18:59), Tetsuo Handa wrote:
[..]
> +++ b/kernel/printk/printk.c
> @@ -1198,6 +1198,14 @@ MODULE_PARM_DESC(ignore_loglevel,
>  
>  static bool suppress_message_printing(int level)
>  {
> +#ifdef CONFIG_KERNEL_BUILT_FOR_FUZZ_TESTING
> +	/*
> +	 * Changing console_loglevel causes "no output". But ignoring
> +	 * console_loglevel is easier than preventing change of
> +	 * console_loglevel.
> +	 */
> +	return (level >= CONSOLE_LOGLEVEL_DEFAULT && !ignore_loglevel);
> +#endif
>  	return (level >= console_loglevel && !ignore_loglevel);
>  }

Can you fuzz test with `ignore_loglevel'?

	-ss