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

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Message-ID: <20170516144104.GA8621@pathway.suse.cz>
Date:   Tue, 16 May 2017 16:41:04 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     kernel-hardening@...ts.openwall.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 2017-05-05 21:07:47, 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.
> 
> Cc: William Roberts <william.c.roberts@...el.com>
> Cc: Dave Weinstein <olorin@...gle.com>
> Signed-off-by: Chris Fries <cfries@...gle.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  Documentation/printk-formats.txt | 10 ++++++----
>  lib/vsprintf.c                   | 12 +++++++++---
>  2 files changed, 15 insertions(+), 7 deletions(-)

This patch should update also the section about
kptr_restrict in Documentation/sysctl/kernel.txt.
It should mention that the trailing P allows to see
pointers also for %pa, and %p[rR] formats when
the level is 4.

Best Regards,
Petr