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

[Dmitry Vyukov]

On Tue, Dec 17, 2019 at 6:12 AM Sergey Senozhatsky
<sergey.senozhatsky.work@xxxxxxxxx> wrote:
>
> 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'?

We can set ignore_loglevel in syzbot configs, but won't it then print
everything including verbose debug output?