On Wed, Sep 18, 2019 at 9:26 PM Richard Guy Briggs <rgb@xxxxxxxxxx> wrote: > Audit events could happen in a network namespace outside of a task > context due to packets received from the net that trigger an auditing > rule prior to being associated with a running task. The network > namespace could be in use by multiple containers by association to the > tasks in that network namespace. We still want a way to attribute > these events to any potential containers. Keep a list per network > namespace to track these audit container identifiiers. > > Add/increment the audit container identifier on: > - initial setting of the audit container identifier via /proc > - clone/fork call that inherits an audit container identifier > - unshare call that inherits an audit container identifier > - setns call that inherits an audit container identifier > Delete/decrement the audit container identifier on: > - an inherited audit container identifier dropped when child set > - process exit > - unshare call that drops a net namespace > - setns call that drops a net namespace > > Please see the github audit kernel issue for contid net support: > https://github.com/linux-audit/audit-kernel/issues/92 > Please see the github audit testsuiite issue for the test case: > https://github.com/linux-audit/audit-testsuite/issues/64 > Please see the github audit wiki for the feature overview: > https://github.com/linux-audit/audit-kernel/wiki/RFE-Audit-Container-ID > Signed-off-by: Richard Guy Briggs <rgb@xxxxxxxxxx> > Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx> > Reviewed-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx> > --- > include/linux/audit.h | 19 +++++++++++ > kernel/audit.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++-- > kernel/nsproxy.c | 4 +++ > 3 files changed, 108 insertions(+), 2 deletions(-) ... > diff --git a/kernel/audit.c b/kernel/audit.c > index 7cdb76b38966..e0c27bc39925 100644 > --- a/kernel/audit.c > +++ b/kernel/audit.c > @@ -373,6 +381,75 @@ static struct sock *audit_get_sk(const struct net *net) > return aunet->sk; > } > > +void audit_netns_contid_add(struct net *net, u64 contid) > +{ > + struct audit_net *aunet; > + struct list_head *contid_list; > + struct audit_contid *cont; > + > + if (!net) > + return; > + if (!audit_contid_valid(contid)) > + return; > + aunet = net_generic(net, audit_net_id); > + if (!aunet) > + return; > + contid_list = &aunet->contid_list; > + spin_lock(&aunet->contid_list_lock); > + list_for_each_entry_rcu(cont, contid_list, list) > + if (cont->id == contid) { > + refcount_inc(&cont->refcount); > + goto out; > + } > + cont = kmalloc(sizeof(struct audit_contid), GFP_ATOMIC); kmalloc(sizeof(*cont), GFP_ATOMIC) > + if (cont) { > + INIT_LIST_HEAD(&cont->list); > + cont->id = contid; > + refcount_set(&cont->refcount, 1); > + list_add_rcu(&cont->list, contid_list); > + } > +out: > + spin_unlock(&aunet->contid_list_lock); > +} -- paul moore www.paul-moore.com
