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Date:   Fri, 10 May 2019 12:24:01 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Petr Mladek <pmladek@suse.com>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        "Tobin C . Harding" <me@tobin.cc>, Michal Hocko <mhocko@suse.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
        linux-kernel@vger.kernel.org,
        Michael Ellerman <mpe@ellerman.id.au>,
        linuxppc-dev@lists.ozlabs.org, Russell Currey <ruscur@russell.cc>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        Stephen Rothwell <sfr@ozlabs.org>,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
        Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH] vsprintf: Do not break early boot with probing
 addresses
Message-ID: <20190510122401.21a598f6@gandalf.local.home>
In-Reply-To: <20190510084213.22149-1-pmladek@suse.com>
References: <20190510081635.GA4533@jagdpanzerIV>
        <20190510084213.22149-1-pmladek@suse.com>
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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 ?

-- Steve