lxc_container: Don't call virGetGroupList during exec

Commit 75c1256 states that virGetGroupList must not be called
between fork and exec, then commit ee777e99 promptly violated
that for lxc.

Patch originally posted by Eric Blake <eblake@redhat.com>.

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index b51d7a2e8553f1d13d35f4ff234892266bbef1f0..ca8a39ec8fd3f01ca25f77e2f28e794e43dbebfc 100644 (file)
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -351,24 +351,18 @@ int lxcContainerWaitForContinue(int control)
  */
 static int lxcContainerSetID(virDomainDefPtr def)
 {
-    gid_t *groups;
-    int ngroups;
-
     /* Only call virSetUIDGID when user namespace is enabled
      * for this container. And user namespace is only enabled
      * when nuidmap&ngidmap is not zero */
 
     VIR_DEBUG("Set UID/GID to 0/0");
     if (def->idmap.nuidmap &&
-        ((ngroups = virGetGroupList(0, 0, &groups) < 0) ||
-         virSetUIDGID(0, 0, groups, ngroups) < 0)) {
+        virSetUIDGID(0, 0, NULL, 0) < 0) {
         virReportSystemError(errno, "%s",
                              _("setuid or setgid failed"));
-        VIR_FREE(groups);
         return -1;
     }
 
-    VIR_FREE(groups);
     return 0;
 }