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| author | Eric W. Biederman <ebiederm@xmission.com> | 2011-11-17 01:32:59 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-04-26 02:00:59 -0700 |
| commit | 783291e6900292521a3895583785e0c04a56c5b3 (patch) | |
| tree | 9dd368a25ea61b5913646b1d93ec99e865c058ba /security | |
| parent | 7b44ab978b77a91b327058a0f4db7e6fcdb90b92 (diff) | |
| download | linux-stable-783291e6900292521a3895583785e0c04a56c5b3.tar.gz linux-stable-783291e6900292521a3895583785e0c04a56c5b3.tar.bz2 linux-stable-783291e6900292521a3895583785e0c04a56c5b3.zip | |
userns: Simplify the user_namespace by making userns->creator a kuid.
- 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>
Diffstat (limited to 'security')
| -rw-r--r-- | security/commoncap.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index 435d074853f3..f2399d8afbe0 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -76,8 +76,9 @@ int cap_capable(const struct cred *cred, struct user_namespace *targ_ns, int cap, int audit) { for (;;) { - /* The creator of the user namespace has all caps. */ - if (targ_ns != &init_user_ns && targ_ns->creator == cred->user) + /* The owner of the user namespace has all caps. */ + if (targ_ns != &init_user_ns && uid_eq(targ_ns->owner, + make_kuid(cred->user_ns, cred->euid))) return 0; /* Do we have the necessary capabilities? */ |