fix: change the propagation type of the root mount to shared

The mount propagation type will be private,slave if a new mount
namespace is creted by clone() and CLONE_NEWUSER is also used.
Change it to shared,slave.

Signed-off-by: reddevillg <reddevillg@gmail.com>

Author: reddevillg

libs/utils/src/linglong/utils/namespace.cpp

@@ -10,6 +10,7 @@
 #include "linglong/utils/log/log.h"
 
 #include <sys/capability.h>
+#include <sys/mount.h>
 #include <sys/prctl.h>
 
 #include <fstream>
@@ -312,6 +313,11 @@ int runInNamespaceEntry(void *args)
         }
     }
 
+    if (mount("", "/", "", MS_SHARED | MS_REC, NULL) == -1) {
+        LogW("failed to change propagation type of / to shared: {}",
+             common::error::errorString(errno));
+    }
+
     LogD("run command {}", runInNamespaceArgs->argv[0]);
     for (int i = 1; i < runInNamespaceArgs->argc; ++i) {
         LogD("argv[{}]: {}", i, runInNamespaceArgs->argv[i]);