linux-kernel - Re: [PATCH V3] iscsi_ibft: fix crash due to KASLR physical memory remapping

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Date:   Thu, 29 Jul 2021 21:20:58 +0200
From:   Maurizio Lombardi <mlombard@...hat.com>
To:     Konrad Rzeszutek Wilk <konrad@...nok.org>
Cc:     Mike Rapoport <rppt@...nel.org>, bp@...en8.de, tglx@...utronix.de,
        x86@...nel.org, Peter Jones <pjones@...hat.com>, konrad@...nel.org,
        George Kennedy <george.kennedy@...cle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] iscsi_ibft: fix crash due to KASLR physical memory remapping

čt 29. 7. 2021 v 19:03 odesílatel Konrad Rzeszutek Wilk
<konrad@...nok.org> napsal:
> One part that I think you are saying but just want to double-check is
> that the isa_bus_to_virt() virtual addresses it returns - those are
> different every boot when KASLR is enabled, right?
>

Yes.
If KASLR is disabled, the physical memory is mapped at virtual base
address 0xffff888000000000 (on AMD64);
if enabled, KASLR will randomize it.

Maurizio