audit: clean up AUDIT_GET/SET local variables and future-proof API
Re-named confusing local variable names (status_set and status_get didn't agree
with their command type name) and reduced their scope.
Future-proof API changes by not depending on the exact size of the audit_status
struct and by adding an API version field.
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
diff --git a/kernel/audit.c b/kernel/audit.c
index 833f8e2..80b7de0 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -743,7 +743,6 @@
{
u32 seq;
void *data;
- struct audit_status *status_get, status_set;
int err;
struct audit_buffer *ab;
u16 msg_type = nlh->nlmsg_type;
@@ -769,34 +768,38 @@
data = nlmsg_data(nlh);
switch (msg_type) {
- case AUDIT_GET:
- memset(&status_set, 0, sizeof(status_set));
- status_set.enabled = audit_enabled;
- status_set.failure = audit_failure;
- status_set.pid = audit_pid;
- status_set.rate_limit = audit_rate_limit;
- status_set.backlog_limit = audit_backlog_limit;
- status_set.lost = atomic_read(&audit_lost);
- status_set.backlog = skb_queue_len(&audit_skb_queue);
+ case AUDIT_GET: {
+ struct audit_status s;
+ memset(&s, 0, sizeof(s));
+ s.enabled = audit_enabled;
+ s.failure = audit_failure;
+ s.pid = audit_pid;
+ s.rate_limit = audit_rate_limit;
+ s.backlog_limit = audit_backlog_limit;
+ s.lost = atomic_read(&audit_lost);
+ s.backlog = skb_queue_len(&audit_skb_queue);
+ s.version = 1;
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
- &status_set, sizeof(status_set));
+ &s, sizeof(s));
break;
- case AUDIT_SET:
- if (nlmsg_len(nlh) < sizeof(struct audit_status))
- return -EINVAL;
- status_get = (struct audit_status *)data;
- if (status_get->mask & AUDIT_STATUS_ENABLED) {
- err = audit_set_enabled(status_get->enabled);
+ }
+ case AUDIT_SET: {
+ struct audit_status s;
+ memset(&s, 0, sizeof(s));
+ /* guard against past and future API changes */
+ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
+ if (s.mask & AUDIT_STATUS_ENABLED) {
+ err = audit_set_enabled(s.enabled);
if (err < 0)
return err;
}
- if (status_get->mask & AUDIT_STATUS_FAILURE) {
- err = audit_set_failure(status_get->failure);
+ if (s.mask & AUDIT_STATUS_FAILURE) {
+ err = audit_set_failure(s.failure);
if (err < 0)
return err;
}
- if (status_get->mask & AUDIT_STATUS_PID) {
- int new_pid = status_get->pid;
+ if (s.mask & AUDIT_STATUS_PID) {
+ int new_pid = s.pid;
if (audit_enabled != AUDIT_OFF)
audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
@@ -804,14 +807,15 @@
audit_nlk_portid = NETLINK_CB(skb).portid;
audit_sock = NETLINK_CB(skb).sk;
}
- if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
- err = audit_set_rate_limit(status_get->rate_limit);
+ if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
+ err = audit_set_rate_limit(s.rate_limit);
if (err < 0)
return err;
}
- if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
- err = audit_set_backlog_limit(status_get->backlog_limit);
+ if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT)
+ err = audit_set_backlog_limit(s.backlog_limit);
break;
+ }
case AUDIT_GET_FEATURE:
err = audit_get_feature(skb);
if (err)