audit: add missing fields to AUDIT_CONFIG_CHANGE event

There are very important fields necessary to understand who is adding audit rules and a little more context about the environment in which its happening. This adds pid, uid, tty, subj, comm, and exe information to the event. These are required fields.

* V2 added calls to audit_put_tty()

See: https://github.com/linux-audit/audit-kernel/issues/59

---
 kernel/audit_watch.c | 24 ++++++++++++++++++++----
 kernel/auditfilter.c | 19 ++++++++++++++++---
 2 files changed, 36 insertions(+), 7 deletions(-)

index 9eb8b3511636..fd68e99042f1 100644
@@ -239,14 +239,30 @@ static struct audit_watch *audit_dupe_watch(struct 

audit_watch *old)
static void audit_watch_log_rule_change(struct audit_krule *r, struct
audit_watch *w, char *op)
{
if (audit_enabled) {
+ struct tty_struct *tty;
+ const struct cred *cred;
struct audit_buffer *ab;
+ char comm[sizeof(current->comm)];
+
ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE); if (unlikely(!ab))
return;
- audit_log_format(ab, "auid=%u ses=%u op=%s",
- from_kuid(&init_user_ns, audit_get_loginuid(current)),
- audit_get_sessionid(current), op);
- audit_log_format(ab, " path=");
+
+ cred = current_cred();
+ tty = audit_get_tty(current);
+ audit_log_format(ab, "pid=%d uid=%u auid=%u tty=%s ses=%u",
+ task_tgid_nr(current),
+ from_kuid(&init_user_ns, cred->uid),
+ from_kuid(&init_user_ns,
+ audit_get_loginuid(current)),
+ tty ? tty_name(tty) : "(none)",
+ audit_get_sessionid(current));
+ audit_put_tty(tty);
+ audit_log_task_context(ab);
+ audit_log_format(ab, " comm=");
+ audit_log_untrustedstring(ab, get_task_comm(comm, current));
+ audit_log_d_path_exe(ab, current->mm);
+ audit_log_format(ab, "op=%s path=", op);
audit_log_untrustedstring(ab, w->path); audit_log_key(ab, r->filterkey); audit_log_format(ab, " list=%d res=1", r->listnr);

index 0b0aa5854dac..9dd4d67f1b95 100644
@@ -1065,8 +1065,9 @@ static void audit_list_rules(int seq, struct 

sk_buff_head *q)
static void audit_log_rule_change(char *action, struct audit_krule *rule, int
res)
{
struct audit_buffer *ab;
- uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
- unsigned int sessionid = audit_get_sessionid(current);
+ struct tty_struct *tty;
+ const struct cred *cred;
+ char comm[sizeof(current->comm)];

if (!audit_enabled)
return;
@@ -1074,8 +1075,20 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); if (!ab)
return;
- audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
+
+ cred = current_cred();
+ tty = audit_get_tty(current);
+ audit_log_format(ab, "pid=%d uid=%u auid=%u tty=%s ses=%u",
+ task_tgid_nr(current),
+ from_kuid(&init_user_ns, cred->uid),
+ from_kuid(&init_user_ns, audit_get_loginuid(current)),
+ tty ? tty_name(tty) : "(none)",
+ audit_get_sessionid(current));
+ audit_put_tty(tty);
audit_log_task_context(ab);
+ audit_log_format(ab, " comm=");
+ audit_log_untrustedstring(ab, get_task_comm(comm, current));
+ audit_log_d_path_exe(ab, current->mm);
audit_log_format(ab, " op=%s", action);
audit_log_key(ab, rule->filterkey);
audit_log_format(ab, " list=%d res=%d", rule->listnr, res);

2.13.6