进程创建时命名空间处理

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最新推荐文章于 2024-05-09 11:27:43 发布

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分类专栏： Linux Kernel 进程管理

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/*
 * called from clone.  This now handles copy for nsproxy and all
 * namespaces therein.
 */
int copy_namespaces(unsigned long flags, struct task_struct *tsk)
{
 struct nsproxy *old_ns = tsk->nsproxy;
 struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
 struct nsproxy *new_ns;
 if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
         CLONE_NEWPID | CLONE_NEWNET |
         CLONE_NEWCGROUP)))) {
  get_nsproxy(old_ns);
  return 0;
 }
 if (!ns_capable(user_ns, CAP_SYS_ADMIN))
  return -EPERM;
 /*
  * CLONE_NEWIPC must detach from the undolist: after switching
  * to a new ipc namespace, the semaphore arrays from the old
  * namespace are unreachable.  In clone parlance, CLONE_SYSVSEM
  * means share undolist with parent, so we must forbid using
  * it along with CLONE_NEWIPC.
  */
 if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) ==
  (CLONE_NEWIPC | CLONE_SYSVSEM)) 
  return -EINVAL;
 new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs);
 if (IS_ERR(new_ns))
  return  PTR_ERR(new_ns);
 tsk->nsproxy = new_ns;
 return 0;
}