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Subject[PATCH ghak90 V7 16/21] audit: add support for contid set/get by netlink
Date
Add the ability to get and set the audit container identifier using an
audit netlink message using message types AUDIT_SET_CONTID 1023 and
AUDIT_GET_CONTID 1022 in addition to using the proc filesystem. The
message format includes the data structure:

struct audit_contid_status {
pid_t pid;
u64 id;
};

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
include/uapi/linux/audit.h | 2 ++
kernel/audit.c | 40 ++++++++++++++++++++++++++++++++++++++++
kernel/audit.h | 5 +++++
3 files changed, 47 insertions(+)

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index f34108759e8f..e26729fc9943 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -73,6 +73,8 @@
#define AUDIT_GET_FEATURE 1019 /* Get which features are enabled */
#define AUDIT_CONTAINER_OP 1020 /* Define the container id and info */
#define AUDIT_SIGNAL_INFO2 1021 /* Get info auditd signal sender */
+#define AUDIT_GET_CONTID 1022 /* Get contid of a task */
+#define AUDIT_SET_CONTID 1023 /* Set contid of a task */

#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
#define AUDIT_USER_AVC 1107 /* We filter this differently */
diff --git a/kernel/audit.c b/kernel/audit.c
index 4fe7678304dd..df92de20ed73 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1216,6 +1216,8 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
case AUDIT_TTY_SET:
case AUDIT_TRIM:
case AUDIT_MAKE_EQUIV:
+ case AUDIT_GET_CONTID:
+ case AUDIT_SET_CONTID:
/* Only support auditd and auditctl in initial pid namespace
* for now. */
if (task_active_pid_ns(current) != &init_pid_ns)
@@ -1273,6 +1275,23 @@ static int audit_get_feature(struct sk_buff *skb)
return 0;
}

+static int audit_get_contid_status(struct sk_buff *skb)
+{
+ struct nlmsghdr *nlh = nlmsg_hdr(skb);
+ u32 seq = nlh->nlmsg_seq;
+ void *data = nlmsg_data(nlh);
+ struct audit_contid_status cs;
+
+ cs.pid = ((struct audit_contid_status *)data)->pid;
+ if (!cs.pid)
+ cs.pid = task_tgid_nr(current);
+ rcu_read_lock();
+ cs.id = audit_get_contid(find_task_by_vpid(cs.pid));
+ rcu_read_unlock();
+ audit_send_reply(skb, seq, AUDIT_GET_CONTID, 0, 0, &cs, sizeof(cs));
+ return 0;
+}
+
static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
u32 old_lock, u32 new_lock, int res)
{
@@ -1700,6 +1719,27 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_end(ab);
break;
}
+ case AUDIT_SET_CONTID: {
+ struct audit_contid_status *s = data;
+ struct task_struct *tsk;
+
+ /* check if new data is valid */
+ if (nlmsg_len(nlh) < sizeof(*s))
+ return -EINVAL;
+ tsk = find_get_task_by_vpid(s->pid);
+ if (!tsk)
+ return -EINVAL;
+
+ err = audit_set_contid(tsk, s->id);
+ put_task_struct(tsk);
+ return err;
+ break;
+ }
+ case AUDIT_GET_CONTID:
+ err = audit_get_contid_status(skb);
+ if (err)
+ return err;
+ break;
default:
err = -EINVAL;
break;
diff --git a/kernel/audit.h b/kernel/audit.h
index c9b73abfd6a0..25732fbc47a4 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -224,6 +224,11 @@ static inline int audit_hash_contid(u64 contid)

#define AUDIT_CONTID_COUNT 1 << 16

+struct audit_contid_status {
+ pid_t pid;
+ u64 id;
+};
+
/* Indicates that audit should log the full pathname. */
#define AUDIT_NAME_FULL -1

--
1.8.3.1
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