[xen stable-4.13] tools/ocaml/xenstored: check privilege for XS_IS_DOMAIN_INTRODUCED

[patchbot@xxxxxxx]

commit b6939685484deef2b4fcdd5ca2084980544b55e4
Author:     Edwin Török <edvin.torok@xxxxxxxxxx>
AuthorDate: Tue Dec 15 14:19:28 2020 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Dec 15 14:19:28 2020 +0100

    tools/ocaml/xenstored: check privilege for XS_IS_DOMAIN_INTRODUCED
    
    The Xenstore command XS_IS_DOMAIN_INTRODUCED should be possible for 
privileged
    domains only (the only user in the tree is the xenpaging daemon).
    
    This is part of XSA-115.
    
    Signed-off-by: Edwin Török <edvin.torok@xxxxxxxxxx>
    Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/ocaml/xenstored/process.ml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/ocaml/xenstored/process.ml b/tools/ocaml/xenstored/process.ml
index 2fa6798e3b..fd79ef564f 100644
--- a/tools/ocaml/xenstored/process.ml
+++ b/tools/ocaml/xenstored/process.ml
@@ -166,7 +166,9 @@ let do_setperms con t _domains _cons data =
 let do_error _con _t _domains _cons _data =
        raise Define.Unknown_operation
 
-let do_isintroduced _con _t domains _cons data =
+let do_isintroduced con _t domains _cons data =
+       if not (Connection.is_dom0 con)
+       then raise Define.Permission_denied;
        let domid =
                match (split None '\000' data) with
                | domid :: _ -> int_of_string domid
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.13