[gdm] pam_gdm: return AUTHINFO_UNAVAIL if kernel keyring unavailable

[Ray Strode <halfline src gnome org>]

commit bb12416da1f6e58bda1762eca956b5c61f36d180
Author: Ray Strode <rstrode redhat com>
Date:   Tue Aug 30 16:10:19 2016 -0400

    pam_gdm: return AUTHINFO_UNAVAIL if kernel keyring unavailable
    
    right now we return PAM_SUCCESS if keyutils are unavailable.
    This is the wrong default, we should fail if we aren't able to
    get the password.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770612

 pam_gdm/pam_gdm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pam_gdm/pam_gdm.c b/pam_gdm/pam_gdm.c
index 7beb04e..f491b8d 100644
--- a/pam_gdm/pam_gdm.c
+++ b/pam_gdm/pam_gdm.c
@@ -58,7 +58,7 @@ pam_sm_authenticate (pam_handle_t  *pamh,
                 return PAM_AUTH_ERR;
 #endif
 
-        return PAM_SUCCESS;
+        return PAM_AUTHINFO_UNAVAIL;
 }
 
 int