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author | Jan Beulich <jbeulich@suse.com> | 2013-10-11 09:28:26 +0200 |
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committer | Jan Beulich <jbeulich@suse.com> | 2013-10-11 09:28:26 +0200 |
commit | 40d66baa46ca8a9ffa6df3e063a967d08ec92bcf (patch) | |
tree | 551daf93c5e8b6a8bd50cf58f5a30eb1da8ec1dc /extras/mini-os/netfront.c | |
parent | 4c37ed562224295c0f8b00211287d57cae629782 (diff) | |
download | xen-40d66baa46ca8a9ffa6df3e063a967d08ec92bcf.tar.gz xen-40d66baa46ca8a9ffa6df3e063a967d08ec92bcf.tar.bz2 xen-40d66baa46ca8a9ffa6df3e063a967d08ec92bcf.zip |
x86: correct LDT checks
- MMUEXT_SET_LDT should behave as similarly to the LLDT instruction as
possible: fail only if the base address is non-canonical
- instead LDT descriptor accesses should fault if the descriptor
address ends up being non-canonical (by ensuring this we at once
avoid reading an entry from the mach-to-phys table and consider it a
page table entry)
- fault propagation on using LDT selectors must distinguish #PF and #GP
(the latter must be raised for a non-canonical descriptor address,
which also applies to several other uses of propagate_page_fault(),
and hence the problem is being fixed there)
- map_ldt_shadow_page() should properly wrap addresses for 32-bit VMs
At once remove the odd invokation of map_ldt_shadow_page() from the
MMUEXT_SET_LDT handler: There's nothing really telling us that the
first LDT page is going to be preferred over others.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'extras/mini-os/netfront.c')
0 files changed, 0 insertions, 0 deletions