From: Corneliu ZUZU <czuzu@bitdefender.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Jan Beulich <JBeulich@suse.com>
Cc: Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH] x86/hvm: Fix use-after-free introduced by c/s 428607a
Date: Tue, 2 Feb 2016 14:51:11 +0200 [thread overview]
Message-ID: <56B0A63F.7080301@bitdefender.com> (raw)
In-Reply-To: <56B09B7F.8080307@citrix.com>
On 2/2/2016 2:05 PM, Andrew Cooper wrote:
> Xen and PV guests share the virtual address space, in exactly the same
> way as a native kernel and its userspace. PV guests can map pages at
> 0. Therefore, if Xen were to accidentally follow a NULL pointer, it
> may not result in a pagefault. (Hardware mechanisms such as SMEP and
> SMAP are added protection against this, but don't work on older hardware)
> ~Andrew
Thank you, I finally got it.
(I also read
http://wiki.xenproject.org/wiki/X86_Paravirtualised_Memory_Management ,
cleared things up)
Corneliu.
prev parent reply other threads:[~2016-02-02 12:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-01 17:56 [PATCH] x86/hvm: Fix use-after-free introduced by c/s 428607a Andrew Cooper
2016-02-02 8:00 ` Corneliu ZUZU
2016-02-02 10:04 ` Andrew Cooper
2016-02-02 10:43 ` Jan Beulich
2016-02-02 10:48 ` Andrew Cooper
2016-02-02 10:52 ` Jan Beulich
2016-02-02 10:57 ` Andrew Cooper
2016-02-02 11:39 ` Corneliu ZUZU
2016-02-02 11:44 ` Jan Beulich
2016-02-02 12:05 ` Andrew Cooper
2016-02-02 12:51 ` Corneliu ZUZU [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56B0A63F.7080301@bitdefender.com \
--to=czuzu@bitdefender.com \
--cc=JBeulich@suse.com \
--cc=andrew.cooper3@citrix.com \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.