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pidns: Add setns support

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- Pid namespaces are designed to be inescapable so verify that the
  passed in pid namespace is a child of the currently active
  pid namespace or the currently active pid namespace itself.

  Allowing the currently active pid namespace is important so
  the effects of an earlier setns can be cancelled.

Signed-off-by: Eric W. Biederman <[email protected]>
This commit is contained in:
Eric W. Biederman 2010-03-07 18:17:03 -08:00
commit 57e8391d32
3 changed files with 58 additions and 0 deletions
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3
fs/proc/namespaces.c
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@ -24,6 +24,9 @@ static const struct proc_ns_operations *ns_entries[] = {
#ifdef CONFIG_IPC_NS
&ipcns_operations,
#endif
#ifdef CONFIG_PID_NS
&pidns_operations,
#endif
};
static const struct file_operations ns_file_operations = {