linux-kernel - Re: [kvm-devel] [PATCH] KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram

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]

Date:	Sun, 11 Mar 2007 11:33:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH] KVM: MMU: Fix host memory corruption on i386 with >= 4GB ram


* Avi Kivity <avi@...ranet.com> wrote:

> PAGE_MASK is an unsigned long, so using it to mask physical addresses 
> on i386 (which are 64-bit wide) leads to truncation.  This can result 
> in page->private of unrelated memory pages being modified, with 
> disasterous results.
> 
> Fix by not using PAGE_MASK for physical addresses; instead calculate 
> the correct value directly from PAGE_SIZE.  Also fix a similar 
> BUG_ON().
> 
> Signed-off-by: Avi Kivity <avi@...ranet.com>

i have tested this, albeit with less than 4GB RAM.

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
-
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/