linux-kernel - Re: [RFC 5/6] lib: vsprintf: Add "%paP", "%padP" options

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Date:   Fri, 5 May 2017 22:00:22 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Joe Perches <joe@...ches.com>
Cc:     kernel-hardening@...ts.openwall.com,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        William Roberts <william.c.roberts@...el.com>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>
Subject: Re: [RFC 5/6] lib: vsprintf: Add "%paP", "%padP" options

On Fri, May 05, 2017 at 09:42:40PM -0700, Joe Perches wrote:
> On Fri, 2017-05-05 at 21:07 -0700, Greg KH wrote:
> > From: Chris Fries <cfries@...gle.com>
> > 
> > Add %paP and %padP for physical address that need to always be shown
> > regardless of kptr restrictions.
> 
> The commit message could be improved.

Good point, I'll work on that, thanks.

> I had to look at the actual code to see if %papP was supported.
> 
> > diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> []
> > @@ -82,18 +82,20 @@ Struct Resources:
> >  
> >  Physical addresses types phys_addr_t:
> >  
> > -	%pa[p]	0x01234567 or 0x0123456789abcdef
> > +	%pa[p][P] 0x01234567 or 0x0123456789abcdef
> 
> Well, that's good.
> 
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> []
> > @@ -1394,23 +1394,29 @@ static noinline_for_stack
> >  char *address_val(char *buf, char *end, const void *addr, const char *fmt)
> >  {
> >  	unsigned long long num;
> > +	int cleanse = kptr_restrict_cleanse_addresses();
> 
> bool

I'll change this, thanks.

greg k-h