linux-kernel - Re: [PATCH v2 0/9] xen/x86: PVH Dom0 fixes and fallout adjustments

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] [day] [month] [year] [list]

Message-ID: <e3f4db18-fe1b-ef73-84d6-a3351d83f8f3@suse.com>
Date:   Tue, 5 Oct 2021 08:38:53 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <jbeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Roger Pau Monné <roger.pau@...rix.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH v2 0/9] xen/x86: PVH Dom0 fixes and fallout adjustments

On 30.09.21 14:12, Jan Beulich wrote:
> In order to try to debug hypervisor side breakage from XSA-378 I found
> myself urged to finally give PVH Dom0 a try. Sadly things didn't work
> quite as expected. In the course of investigating these issues I actually
> spotted one piece of PV Dom0 breakage as well, a fix for which is also
> included here.
> 
> There are one immediate remaining issues: Dom0, unlike in the PV case,
> cannot access the screen (to use as a console) when in a non-default
> mode (i.e. not 80x25 text), as the necessary information (in particular
> about VESA-bases LFB modes) is not communicated. On the hypervisor side
> this looks like deliberate behavior, but it is unclear to me what the
> intentions were towards an alternative model. (X may be able to access
> the screen depending on whether it has a suitable driver besides the
> presently unusable /dev/fb<N> based one.)
> 
> v2 merely addresses small review comments in patches 7 and 9 (see there).
> 
> 1: xen/x86: prevent PVH type from getting clobbered
> 2: xen/x86: allow PVH Dom0 without XEN_PV=y
> 3: xen/x86: make "earlyprintk=xen" work better for PVH Dom0
> 4: xen/x86: allow "earlyprintk=xen" to work for PV Dom0
> 5: xen/x86: make "earlyprintk=xen" work for HVM/PVH DomU
> 6: xen/x86: generalize preferred console model from PV to PVH Dom0
> 7: xen/x86: hook up xen_banner() also for PVH
> 8: x86/PVH: adjust function/data placement
> 9: xen/x86: adjust data placement

Series pushed to xen/tip.git for-linus-5.15b


Juergen


Download attachment "OpenPGP_0xB0DE9DD628BF132F.asc" of type "application/pgp-keys" (3092 bytes)

Download attachment "OpenPGP_signature" of type "application/pgp-signature" (496 bytes)