path: root/tools/testing
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authorAndrey Vagin <avagin@openvz.org>2016-09-06 00:47:14 -0700
committerEric W. Biederman <ebiederm@xmission.com>2016-09-22 19:59:40 -0500
commit6786741dbf99e44fb0c0ed85a37582b8a26f1c3b (patch)
treec6d4f7bbb9920c79f6a6393d0900bd850507c37a /tools/testing
parentkernel: add a helper to get an owning user namespace for a namespace (diff)
nsfs: add ioctl to get an owning user namespace for ns file descriptor
Each namespace has an owning user namespace and now there is not way to discover these relationships. Understending namespaces relationships allows to answer the question: what capability does process X have to perform operations on a resource governed by namespace Y? After a long discussion, Eric W. Biederman proposed to use ioctl-s for this purpose. The NS_GET_USERNS ioctl returns a file descriptor to an owning user namespace. It returns EPERM if a target namespace is outside of a current user namespace. v2: rename parent to relative v3: Add a missing mntput when returning -EAGAIN --EWB Acked-by: Serge Hallyn <serge@hallyn.com> Link: https://lkml.org/lkml/2016/7/6/158 Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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