audit: Use current instead of NETLINK_CREDS() in audit_filter
Get caller process uid and gid and pid values from the current task
instead of the NETLINK_CB. This is simpler than passing NETLINK_CREDS
from from audit_receive_msg to audit_filter_user_rules and avoid the
chance of being hit by the occassional bugs in netlink uid/gid
credential passing. This is a safe changes because all netlink
requests are processed in the task of the sending process.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/kernel/audit.c b/kernel/audit.c
index 7b7268e..fecb150 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -744,7 +744,7 @@
if (!audit_enabled && msg_type != AUDIT_USER_AVC)
return 0;
- err = audit_filter_user(&NETLINK_CB(skb));
+ err = audit_filter_user();
if (err == 1) {
err = 0;
if (msg_type == AUDIT_USER_TTY) {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index a6c3f1a..b754f43 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1236,8 +1236,7 @@
return strncmp(p, dname, dlen);
}
-static int audit_filter_user_rules(struct netlink_skb_parms *cb,
- struct audit_krule *rule,
+static int audit_filter_user_rules(struct audit_krule *rule,
enum audit_state *state)
{
int i;
@@ -1249,13 +1248,13 @@
switch (f->type) {
case AUDIT_PID:
- result = audit_comparator(cb->creds.pid, f->op, f->val);
+ result = audit_comparator(task_pid_vnr(current), f->op, f->val);
break;
case AUDIT_UID:
- result = audit_comparator(cb->creds.uid, f->op, f->val);
+ result = audit_comparator(current_uid(), f->op, f->val);
break;
case AUDIT_GID:
- result = audit_comparator(cb->creds.gid, f->op, f->val);
+ result = audit_comparator(current_gid(), f->op, f->val);
break;
case AUDIT_LOGINUID:
result = audit_comparator(audit_get_loginuid(current),
@@ -1287,7 +1286,7 @@
return 1;
}
-int audit_filter_user(struct netlink_skb_parms *cb)
+int audit_filter_user(void)
{
enum audit_state state = AUDIT_DISABLED;
struct audit_entry *e;
@@ -1295,7 +1294,7 @@
rcu_read_lock();
list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) {
- if (audit_filter_user_rules(cb, &e->rule, &state)) {
+ if (audit_filter_user_rules(&e->rule, &state)) {
if (state == AUDIT_DISABLED)
ret = 0;
break;