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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 10 Aug 2021 18:00:24 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Maurizio Lombardi <mlombard@...hat.com>
Cc:     rppt@...nel.org, bp@...en8.de, tglx@...utronix.de, x86@...nel.org,
        pjones@...hat.com, konrad@...nel.org, george.kennedy@...cle.com,
        rafael@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] iscsi_ibft: fix crash due to KASLR physical memory
 remapping

> Fix this bug by saving the address of the physical location
> of the ibft; later the driver will use isa_bus_to_virt() to get
> the correct virtual address.

That sound rather broken.  Why not save the physical address in
find_ibft_region and then later ioremap that when a virtual address is
needed like all other code accessing magic I/O memory?