linux-kernel - RE: [RFC 00/06] printk: add more new kernel pointer filter options.

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Date:   Tue, 16 May 2017 21:36:37 +0000
From:   "Roberts, William C" <william.c.roberts@...el.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>
CC:     "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Petr Mladek <pmladek@...e.com>,
        "Sergey Senozhatsky" <sergey.senozhatsky@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>
Subject: RE: [RFC 00/06] printk: add more new kernel pointer filter options.



> -----Original Message-----
> From: Sergey Senozhatsky [mailto:sergey.senozhatsky.work@...il.com]
> Sent: Wednesday, May 10, 2017 6:38 PM
> To: Greg KH <gregkh@...uxfoundation.org>
> 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>;
> Roberts, William C <william.c.roberts@...el.com>; Chris Fries
> <cfries@...gle.com>; Dave Weinstein <olorin@...gle.com>
> Subject: Re: [RFC 00/06] printk: add more new kernel pointer filter options.
> 
> Hello Greg,
> 
> On (05/05/17 21:06), Greg KH wrote:
> > Here's a short patch series from Chris Fries and Dave Weinstein that
> > implement some new restrictions when printing out kernel pointers, as
> > well as the ability to whitelist kernel pointers where needed.
> >
> > These patches are based on work from William Roberts, and also is
> > inspired by grsecurity's %pP to specifically whitelist a kernel
> > pointer, where it is always needed, like the last patch in the series
> > shows, in the UIO drivers (UIO requires that you know the address,
> > it's a hardware address, nothing wrong with seeing that...)
> >
> > I haven't done much to this patch series, only forward porting it from
> > an older kernel release (4.4) and a few minor tweaks.  It applies
> > cleanly on top of 4.11 as well as Linus's current development tree
> > (10502 patches into the 4.12-rc1 merge window).  I'm posting it now
> > for comments if anyone sees anything wrong with this approach
> 
> overall, I don't see anything wrong.
> 
> > or thinks the things that are being whitelisted should not be?
> 
> can't say for sure, sorry.
> 
> 	-ss

I almost missed this, none of the mail was delivered to my inbox...

Anyways, I am glad to see this revived and I don't have any
Comments besides thanks.