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selinux: rate-limit netlink message warnings in selinux_nlmsg_perm()

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Any process is able to send netlink messages with invalid types.
Make the warning rate-limited to prevent too much log spam.

The warning is supposed to help to find misbehaving programs, so
print the triggering command name and pid.

Reported-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
[PM: subject line tweak to make checkpatch.pl happy]
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Vladis Dronov 2015-12-24 11:09:41 -05:00 committed by Paul Moore
parent f9df645821
commit 76319946f3
1 changed files with 5 additions and 4 deletions
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9
security/selinux/hooks.c
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@ -4858,11 +4858,12 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
if (err) {
if (err == -EINVAL) {
printk(KERN_WARNING
"SELinux: unrecognized netlink message:"
" protocol=%hu nlmsg_type=%hu sclass=%s\n",
pr_warn_ratelimited("SELinux: unrecognized netlink"
" message: protocol=%hu nlmsg_type=%hu sclass=%s"
" pig=%d comm=%s\n",
sk->sk_protocol, nlh->nlmsg_type,
secclass_map[sksec->sclass - 1].name);
secclass_map[sksec->sclass - 1].name,
task_pid_nr(current), current->comm);
if (!selinux_enforcing || security_get_allow_unknown())
err = 0;
}