[Xen-changelog] [xen stable-4.12] x86/shim: copy back the result of EVTCHNOP_status

[patchbot@xxxxxxx]

commit ece1cb0a6d9964949e175743e8b2d353c974d886
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Nov 25 15:59:12 2019 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Nov 25 15:59:12 2019 +0100

    x86/shim: copy back the result of EVTCHNOP_status
    
    The event channel data was not copied back to guest memory, fix this
    by doing the copy.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Wei Liu <wl@xxxxxxx>
    master commit: 0f45bbbc404e2d1257476f9caa6644c209ec2c90
    master date: 2019-11-01 10:48:04 +0000
---
 xen/arch/x86/pv/shim.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c
index 324ca27f93..b75975b853 100644
--- a/xen/arch/x86/pv/shim.c
+++ b/xen/arch/x86/pv/shim.c
@@ -516,6 +516,9 @@ static long pv_shim_event_channel_op(int cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         else
             rc = xen_hypercall_event_channel_op(EVTCHNOP_status, &status);
 
+        if ( !rc && __copy_to_guest(arg, &status, 1) )
+            rc = -EFAULT;
+
         break;
     }
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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