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xen-devel
Re: [Xen-devel] [PATCH] Protect Xen against accessing NULL-pointer trigg
Santos, Jose Renato G wrote:
Xiaowei,
Could you please clarify what is the NULL pointer problem that you want to
prevent with this patch?
Thanks
Oh, let me put more details. For late coming CPUs that Xenoprof doesn't
support yet, pointers cpu_type and model could be unassigned at init
time and remains as NULL. However almost all Xenoprof internal functions
doesn't check it before using. If the hyercall handler doesn't take care
of it, dom0 could exploit it (e.g. XENOPROF_reserve_counters) to trigger
Xen NULL-pointer access.
Thanks,
Xiaowei
Renato
-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
Yang, Xiaowei
Sent: Tuesday, January 20, 2009 8:28 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH] Protect Xen against accessing
NULL-pointer triggered by Xenoprof Hypercall in dom0
Xenoprof Hypercall in dom0 could trigger Xen accessing
NULL-pointer and results in fatal page fault. The patch prevents it.
Signed-off-by: Xiaowei Yang <xiaowei.yang@xxxxxxxxx>
Thanks,
Xiaowei
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