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userns: Simplify the user_namespace by making userns->creator a kuid.

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- Transform userns->creator from a user_struct reference to a simple
  kuid_t, kgid_t pair.

  In cap_capable this allows the check to see if we are the creator of
  a namespace to become the classic suser style euid permission check.

  This allows us to remove the need for a struct cred in the mapping
  functions and still be able to dispaly the user namespace creators
  uid and gid as 0.

- Remove the now unnecessary delayed_work in free_user_ns.

  All that is left for free_user_ns to do is to call kmem_cache_free
  and put_user_ns.  Those functions can be called in any context
  so call them directly from free_user_ns removing the need for delayed work.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2011-11-17 01:32:59 -08:00
parent 7b44ab978b
commit 783291e690
4 changed files with 30 additions and 30 deletions
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4
include/linux/user_namespace.h
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@ -9,8 +9,8 @@
struct user_namespace {
struct kref kref;
struct user_namespace *parent;
struct user_struct *creator;
struct work_struct destroyer;
kuid_t owner;
kgid_t group;
};
extern struct user_namespace init_user_ns;