linux-kernel - Re: [RFC PATCH v2] mm: slub: print kernel addresses in slub debug messages

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Date:   Mon, 12 Aug 2019 16:24:50 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        "Tobin C . Harding" <me@...in.cc>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [RFC PATCH v2] mm: slub: print kernel addresses in slub debug
 messages

On Fri, 2019-08-09 at 07:26 -0700, Matthew Wilcox wrote:
> On Fri, Aug 09, 2019 at 10:11:58PM +0800, Miles Chen wrote:
> > On Thu, 2019-08-08 at 19:46 -0700, Matthew Wilcox wrote:
> > > On Fri, Aug 09, 2019 at 09:08:37AM +0800, miles.chen@...iatek.com wrote:
> > > > INFO: Slab 0x(____ptrval____) objects=25 used=10 fp=0x(____ptrval____)
> > > 
> > > ... you don't have any randomness on your platform?
> > 
> > We have randomized base on our platforms.
> 
> Look at initialize_ptr_random().  If you have randomness, then you
> get a siphash_1u32() of the address.  With no randomness, you get this
> ___ptrval___ string instead.
> 
You are right. There is no randomness in this platform. (I ran my test
code on Qemu with no randomness)


thanks again