Re: [PATCH] vsprintf: Do not break early boot with probing addresses

Andy Shevchenko
2019-05-10T16:41:34Z

On Fri, May 10, 2019 at 12:24:01PM -0400, Steven Rostedt wrote:
> On Fri, 10 May 2019 10:42:13 +0200
> Petr Mladek <pmladek@suse.com> wrote:
>
> > static const char *check_pointer_msg(const void *ptr)
> > {
> > - char byte;
> > -
> > if (!ptr)
> > return "(null)";
> >
> > - if (probe_kernel_address(ptr, byte))
> > + if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
> > return "(efault)";
> >
>
>
> < PAGE_SIZE ?
>
> do you mean: < TASK_SIZE ?

Original code used PAGE_SIZE. If it needs to be changed, that it might be a
separate explanation / patch.

--
With Best Regards,
Andy Shevchenko