linux-kernel - Re: [PATCH v5 0/4] KASAN for powerpc64 radix

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 linux-cve-announce 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]

Message-ID: <8a1b7f4b-de14-90fe-2efa-789882d28702@c-s.fr>
Date:   Thu, 16 Jan 2020 10:34:05 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Daniel Axtens <dja@...ens.net>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        kasan-dev@...glegroups.com, aneesh.kumar@...ux.ibm.com,
        bsingharora@...il.com
Subject: Re: [PATCH v5 0/4] KASAN for powerpc64 radix

Le 09/01/2020 à 08:08, Daniel Axtens a écrit :
> Building on the work of Christophe, Aneesh and Balbir, I've ported
> KASAN to 64-bit Book3S kernels running on the Radix MMU.
> 
> This provides full inline instrumentation on radix, but does require
> that you be able to specify the amount of physically contiguous memory
> on the system at compile time. More details in patch 4.

This might be a stupid idea as I don't know ppc64 much. IIUC, PPC64 
kernel can be relocated, there is no requirement to have it at address 
0. Therefore, would it be possible to put the KASAN shadow mem at the 
begining of the physical memory, instead of putting it at the end ?
That way, you wouldn't need to know the amount of memory at compile time 
because KASAN shadow mem would always be at address 0.

Christophe