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| author | Ian Jackson <Ian.Jackson@eu.citrix.com> | 2012-11-14 11:43:29 +0000 |
|---|---|---|
| committer | Ian Jackson <Ian.Jackson@eu.citrix.com> | 2012-11-14 11:43:29 +0000 |
| commit | 1d435032de14b9dec808102940309047903f7ed0 (patch) | |
| tree | afd29e8047bcb2ee9b01c049b241e21dafece422 /tools/blktap2/drivers/hashtable_utility.c | |
| parent | 9070a6ef041756341286e88e7fad7de3e01c66f9 (diff) | |
| download | xen-1d435032de14b9dec808102940309047903f7ed0.tar.gz xen-1d435032de14b9dec808102940309047903f7ed0.tar.bz2 xen-1d435032de14b9dec808102940309047903f7ed0.zip | |
xen/mm/shadow: check toplevel pagetables are present before unhooking them.
If the guest has not fully populated its top-level PAE entries when it calls
HVMOP_pagetable_dying, the shadow code could try to unhook entries from
MFN 0. Add a check to avoid that case.
This issue was introduced by c/s 21239:b9d2db109cf5.
This is a security problem, XSA-23 / CVE-2012-4538.
Signed-off-by: Tim Deegan <tim@xen.org>
Tested-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Diffstat (limited to 'tools/blktap2/drivers/hashtable_utility.c')
0 files changed, 0 insertions, 0 deletions