lkml.org 
[lkml]   [2009]   [Apr]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 69/88] KVM: MMU: check for present pdptr shadow page in walk_shadow
2.6.28-stable review patch.  If anyone has any objections, please let us know.

------------------


(cherry picked from eb64f1e8cd5c3cae912db30a77d062367f7a11a6)

walk_shadow assumes the caller verified validity of the pdptr pointer in
question, which is not the case for the invlpg handler.

Fixes oops during Solaris 10 install.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kvm/mmu.c | 2 ++
1 file changed, 2 insertions(+)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1159,6 +1159,8 @@ static int walk_shadow(struct kvm_shadow
if (level == PT32E_ROOT_LEVEL) {
shadow_addr = vcpu->arch.mmu.pae_root[(addr >> 30) & 3];
shadow_addr &= PT64_BASE_ADDR_MASK;
+ if (!shadow_addr)
+ return 1;
--level;
}




\
 
 \ /
  Last update: 2009-04-30 19:43    [W:0.557 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site