| commit | 7bf8439befd355aa60d8448ba238b555f0242482 | |
| author | Avi Kivity <avi@redhat.com> | |
| Wed, 12 May 2010 08:48:18 +0000 (12 11:48 +0300) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Mon, 5 Jul 2010 18:23:02 +0000 (5 11:23 -0700) | ||
| tree | 66b6d42f035c161817ca66d384d2eae9c5603ea8 | treesnapshot (tar.gz zip) |
| parent | 6809d9686bf751235b9acc8869fa5793f9fe912d | commitdiff |
KVM: MMU: Segregate shadow pages with different cr0.wp
When cr0.wp=0, we may shadow a gpte having u/s=1 and r/w=0 with an spte
having u/s=0 and r/w=1. This allows excessive access if the guest sets
cr0.wp=1 and accesses through this spte.
Fix by making cr0.wp part of the base role; we'll have different sptes for
the two cases and the problem disappears.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
(Cherry-picked from commit 3dbe141595faa48a067add3e47bba3205b79d33c)
When cr0.wp=0, we may shadow a gpte having u/s=1 and r/w=0 with an spte
having u/s=0 and r/w=1. This allows excessive access if the guest sets
cr0.wp=1 and accesses through this spte.
Fix by making cr0.wp part of the base role; we'll have different sptes for
the two cases and the problem disappears.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
(Cherry-picked from commit 3dbe141595faa48a067add3e47bba3205b79d33c)
| arch/x86/include/asm/kvm_host.h | diffblobblamehistory | |
| arch/x86/kvm/mmu.c | diffblobblamehistory |