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Subject[RFC Part1 PATCH 00/20 v2] Add namespace support for audit
Here is the v1 patchset:

The main target of this patchset is allowing user in audit
namespace to generate the USER_MSG type of audit message,
some userspace tools need to generate audit message, or
these tools will broken.

And the login process in container may want to setup
/proc/<pid>/loginuid, right now this value is unalterable
once it being set. this will also broke the login problem
in container. After this patchset, we can reset this loginuid
to zero if task is running in a new audit namespace.

Same with v1 patchset, in this patchset, only the privileged
user in init_audit_ns and init_user_ns has rights to
add/del audit rules. and these rules are gloabl. all
audit namespace will comply with the rules.

Compared with v1, v2 patch has some big changes.
1, the audit namespace is not assigned to user namespace.
since there is no available bit of flags for clone, we
create audit namespace through netlink, patch[18/20]
introduces a new audit netlink type AUDIT_CREATE_NS.
the privileged user in userns has rights to create a
audit namespace, it means the unprivileged user can
create auditns through create userns first. In order
to prevent them from doing harm to host, the default
audit_backlog_limit of un-init-audit-ns is zero(means
audit is unavailable in audit namespace). and it can't
be changed in auditns through netlink.

2, introduce /proc/<pid>/audit_log_limit
this interface is used to setup log_limit of audit
namespace. we need this interface to make audit
available in un-init-audit-ns. Only the privileged user
has right to set this value, it means only the root user
of host can change it.

3, make audit namespace don't depend on net namespace.
patch[1/20] add a compare function audit_compare for
audit netlink, it always return true, it means the
netlink subsystem will find out the netlink socket
only through portid and netlink type. So we needn't
to create kernel side audit netlink socket for per
net namespace, all userspace audit netlink socket
can find out the audit_sock, and audit_sock can
communicate with them through the proper portid.
it's just like the behavior we don't have net
namespace before.

This patchset still need some work, such as allow changing
audit_enabled in audit namespace, auditd wants this feature.

I send this patchset now in order to get more comments, so
I can keep on improving namespace support for audit.

Gao feng (20):
Audit: make audit netlink socket net namespace unaware
audit: introduce configure option CONFIG_AUDIT_NS
audit: make audit_skb_queue per audit namespace
audit: make audit_skb_hold_queue per audit namespace
audit: make audit_pid per audit namespace
audit: make kauditd_task per audit namespace
aduit: make audit_nlk_portid per audit namespace
audit: make kaudit_wait queue per audit namespace
audit: make audit_backlog_wait per audit namespace
audit: allow un-init audit ns to change pid and portid only
audit: use proper audit namespace in audit_receive_msg
audit: use proper audit_namespace in kauditd_thread
audit: introduce new audit logging interface for audit namespace
audit: pass proper audit namespace to audit_log_common_recv_msg
audit: Log audit pid config change in audit namespace
audit: allow GET,SET,USER MSG operations in audit namespace
nsproxy: don't make create_new_namespaces static
audit: add new message type AUDIT_CREATE_NS
audit: make audit_backlog_limit per audit namespace
audit: introduce /proc/<pid>/audit_backlog_limit

fs/proc/base.c | 53 ++++++
include/linux/audit.h | 26 ++-
include/linux/audit_namespace.h | 92 ++++++++++
include/linux/nsproxy.h | 15 +-
include/uapi/linux/audit.h | 1 +
init/Kconfig | 10 ++
kernel/Makefile | 2 +-
kernel/audit.c | 364 +++++++++++++++++++++++++---------------
kernel/audit.h | 5 +-
kernel/audit_namespace.c | 123 ++++++++++++++
kernel/auditsc.c | 6 +-
kernel/nsproxy.c | 18 +-
12 files changed, 561 insertions(+), 154 deletions(-)
create mode 100644 include/linux/audit_namespace.h
create mode 100644 kernel/audit_namespace.c


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