linux-kernel - [PATCH 0/4] xen: critical bug fixes for 2.6.39-rc3

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-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.00.1104121149280.22672@kaball-desktop>
Date:	Tue, 12 Apr 2011 12:16:20 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<xen-devel@...ts.xensource.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 0/4] xen: critical bug fixes for 2.6.39-rc3

Hi all,
this is a small collection of critical xen bug fixes for 2.6.39-rc3:
the recent changes to the initial kernel pagetable allocation mechanism
(4b239f458c229de044d6905c2b0f9fe16ed9e01e in particular) caused a number
of issues on Xen.
This patch series fixes those issues and it is required just to boot a
2.6.39 linux kernel as regular xen guest.

The list of patches with a diffstat follows:

Stefano Stabellini (4):
      xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top
      x86,xen: introduce x86_init.mapping.pagetable_reserve
      xen: more debugging in the e820 parsing
      xen: do not create the extra e820 region at an addr lower than 4G

 arch/x86/include/asm/pgtable_types.h |    1 +
 arch/x86/include/asm/x86_init.h      |    9 +++++++++
 arch/x86/kernel/x86_init.c           |    4 ++++
 arch/x86/mm/init.c                   |    9 +++++++--
 arch/x86/xen/mmu.c                   |   17 ++++++++++++++++-
 arch/x86/xen/setup.c                 |    6 +++++-
 6 files changed, 42 insertions(+), 4 deletions(-)

The first two commits make sure pagetable pages are marked RO while
other pages are marked RW.

The third commit adds a couple of useful debugging statements.

The fourth commit fixes a boot crash on xen when booting as initial
domain: the xen extra memory region shouldn't start below 4G otherwise
e820_end_of_low_ram_pfn() could return an address above 4G. As a
consequence init_memory_mapping would end up mapping MMIO regions
without going through the fixmap.

A git branch with this series is available here:

git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.39-rc3-fixes

Comments are welcome.

- Stefano
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/