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Re: [PATCH] /proc/kcore: Update physical address for kcore ram and text

From Pratyush Anand <panand@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH] /proc/kcore: Update physical address for kcore ram and text
Date 2017-02-24 08:30 +0100
Message-ID <teiud-5h2-5@gated-at.bofh.it> (permalink)
References <t3nGV-5xU-1@gated-at.bofh.it> <taxia-1ll-5@gated-at.bofh.it> <taxi9-1ll-3@gated-at.bofh.it> <taApJ-3o3-33@gated-at.bofh.it>
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Hi Andrew/Kees,

On Tuesday 14 February 2017 07:16 AM, Pratyush Anand wrote:
>>
>> Well, CONFIG_PROC_KCORE is a generalized root KASLR exposure (though
>> there are lots of such exposures). Why is the actual physical address
>> needed? Can this just report the virtual address instead? Then the
>> tool can build a map, but it looks like an identity map, rather than
>> creating a new physical/virtual memory ASLR offset exposure?
>
> Well, having an ASLR offset information can help to translate an
> identity mapped virtual address to a physical address. But that would be
> an additional field in PT_LOAD header structure and an arch dependent
> value.
>
> Moreover, sending a valid physical address like 0 does not seem right.
> So, IMHO it is better to fix that and send valid physical address when
> available (identity mapped).
>
> Thanks for the review.

So, whats the decision on this patch? I see that patch is lying in 
next/master. Should I expect this patch in v4.11-rc1?

Couple of user-space makedumpfile modification will depend on this 
patch. So, we can not get those makedumpfile patches merged until this 
patch hits upstream.

~Pratyush

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Thread

Re: [PATCH] /proc/kcore: Update physical address for kcore ram and text Kees Cook <keescook@chromium.org> - 2017-02-13 23:30 +0100
  Re: [PATCH] /proc/kcore: Update physical address for kcore ram and  text Pratyush Anand <panand@redhat.com> - 2017-02-14 02:50 +0100
    Re: [PATCH] /proc/kcore: Update physical address for kcore ram and  text Pratyush Anand <panand@redhat.com> - 2017-02-24 08:30 +0100
  Re: [PATCH] /proc/kcore: Update physical address for kcore ram and  text Baoquan He <bhe@redhat.com> - 2017-02-24 09:00 +0100

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