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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 <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2010-03-07 18:17:03 -08:00
parent 225778d68d
commit 57e8391d32
3 changed files with 58 additions and 0 deletions
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1
include/linux/proc_fs.h
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@ -251,6 +251,7 @@ struct proc_ns_operations {
extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
union proc_op {
int (*proc_get_link)(struct dentry *, struct path *);