pie: A quick workaround for PR_SET_DUMPABLE == 2 restore error.

[ xemul: It's a temporary workaround not to lock the -rc2 release.
  Once we have some better solution, this will be rolled back. ]
Signed-off-by: Saied Kazemi <saied@google.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

pie/restorer.c

@@ -194,7 +194,11 @@ static int restore_dumpable_flag(MmEntry *mme)
 	int ret;
 
 	if (mme->has_dumpable) {
-		ret = sys_prctl(PR_SET_DUMPABLE, mme->dumpable, 0, 0, 0);
+               /*
+                * Allowed values for PR_SET_DUMPABLE are only
+                * SUID_DUMP_DISABLE (0) and SUID_DUMP_USER (1).
+                */
+               ret = sys_prctl(PR_SET_DUMPABLE, mme->dumpable == 1 ? 1 : 0, 0, 0, 0);
 		if (ret) {
 			pr_err("Unable to set PR_SET_DUMPABLE: %d\n", ret);
 			return -1;