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userns: Add an explicit reference to the parent user namespace

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I am about to remove the struct user_namespace reference from struct user_struct.
So keep an explicit track of the parent user namespace.

Take advantage of this new reference and replace instances of user_ns->creator->user_ns
with user_ns->parent.

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 2011-11-16 21:59:43 -08:00
parent 0093ccb68f
commit aeb3ae9da9
3 changed files with 8 additions and 8 deletions
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2
security/commoncap.c
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@ -92,7 +92,7 @@ int cap_capable(const struct cred *cred, struct user_namespace *targ_ns,
*If you have a capability in a parent user ns, then you have
* it over all children user namespaces as well.
*/
targ_ns = targ_ns->creator->user_ns;
targ_ns = targ_ns->parent;
}
/* We never get here */