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Date: Thu, 29 Sep 2016 09:43:24 +0200
From: Simon Horman <horms@...ge.net.au>
To: Baoquan He <bhe@...hat.com>
Cc: tonli@...hat.com, kexec@...ts.infradead.org,
Thomas Garnier <thgarnie@...gle.com>, keescook@...omium.org,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH v1] kexec/arch/i386: Add support for KASLR memory
randomization
On Tue, Sep 13, 2016 at 03:10:05PM +0800, Baoquan He wrote:
> From: Thomas Garnier <thgarnie@...gle.com>
>
> Multiple changes were made on KASLR (right now in linux-next). One of
> them is randomizing the virtual address of the physical mapping, vmalloc
> and vmemmap memory sections. It breaks kdump ability to read physical
> memory.
>
> This change identifies if KASLR memories randomization is used by
> checking if the page_offset_base variable exists. It search for the
> correct PAGE_OFFSET value by looking at the loaded memory section and
> find the lowest aligned on PUD (the randomization level).
>
> Related commits on linux-next:
> - 0483e1fa6e09d4948272680f691dccb1edb9677f: Base for randomization
> - 021182e52fe01c1f7b126f97fd6ba048dc4234fd: Enable for PAGE_OFFSET
>
> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
Thanks, applied.
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