[tests/selinux] pr775-checkpolicy-revdeps: selinux_set_callback: fix SETENFORCE callback test

[Petr Lautrbach <plautrba@redhat.com>]

            A new commit has been pushed.

            Repo   : tests/selinux
            Branch : pr775-checkpolicy-revdeps
            Commit : 5fe4b9e652ef51f34e20453f6c45907ca2c9b30c
            Author : Petr Lautrbach <plautrba@redhat.com>
            Date   : 2021-07-29T12:25:33+02:00
            Stats  : +11/-4 in 1 file(s)
            URL    : https://src.fedoraproject.org/tests/selinux/c/5fe4b9e652ef51f34e20453f6c45907ca2c9b30c?branch=pr775-checkpolicy-revdeps

            Log:
            selinux_set_callback: fix SETENFORCE callback test

When enforcing is switched to permissive and back to enforcing before
the status is updated, the SETENFORCE callback is not called as the state is
same as before.

Also avc_init is deprecated:
    test_callback.c:62:5: warning: ‘avc_init’ is deprecated: Use avc_open and selinux_set_callback [-Wdeprecated-declarations]

---
diff --git a/libselinux/selinux_set_callback/test_callback.c b/libselinux/selinux_set_callback/test_callback.c
index 240bd11..9a4cd62 100644
--- a/libselinux/selinux_set_callback/test_callback.c
+++ b/libselinux/selinux_set_callback/test_callback.c
@@ -58,8 +58,8 @@ int main (int argc, char **argv) {
     }
 
     printf("calling avc_audit to call audit and log functions\n");
-    
-    avc_init("", NULL, NULL, NULL, NULL);
+
+    avc_open(NULL, 0);
     
     struct security_id ssid = { "asdf", 5 };
     struct security_id tsid = { "asdf", 5 };
@@ -99,11 +99,9 @@ int main (int argc, char **argv) {
 
     if (enforcing == 1) {
         security_setenforce(0);
-        security_setenforce(1);
     }
     else {
         security_setenforce(1);
-        security_setenforce(0);
     }
 
     // triggers callbacks
@@ -123,5 +121,14 @@ int main (int argc, char **argv) {
     // triggers callbacks
     avc_has_perm_noaudit(&ssid, &tsid, 0, 1, NULL, &avd);
 
+    printf("switch enforcing back to %d\n", enforcing);
+    enforcing = security_getenforce();
+    if (enforcing == 1) {
+        security_setenforce(0);
+    }
+    else {
+        security_setenforce(1);
+    }
+
     return exit_code;
 }