From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steve Grubb <sgrubb@redhat.com>
Subject: Re: audit 1.2.2 released
Date: Tue, 16 May 2006 11:23:14 -0400
Message-ID: <200605161123.14242.sgrubb@redhat.com>
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To: Michael C Thompson <thompsmc@us.ibm.com>
Cc: Linux Audit <linux-audit@redhat.com>
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On Tuesday 16 May 2006 10:53, Michael C Thompson wrote:
> I've "enchanced" this transcript with strace output (selective) and the
> return code of the selinux_socket_recvmsg call.
>
> > # auditctl -l
>
> sendto(3, "\20\0\0\0\365\3\5\0\1\0\0\0\0\0\0\0", 16, 0,
> {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 16
> poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 100) = 1
> recvfrom(3, "$\0\0\0\2\0\0\0\1\0\0\0\322\7\0\0\377\377\377\377\20\0"...,
> 8476, MSG_PEEK|MSG_DONTWAIT, {sa_family=AF_NETLINK, pid=0,
> groups=00000000}, [12]) = 36
> -> selinux_sock_recvmsg returns 0
>
> recvfrom(3, "$\0\0\0\2\0\0\0\1\0\0\0\322\7\0\0\377\377\377\377\20\0"...,
> 8476, MSG_DONTWAIT, {sa_family=AF_NETLINK, pid=0, groups=00000000},
> [12]) = 36
> -> selinux_sock_recvmsg returns 0

This return code says -EPERM.

> > # auditctl -l
>
> sendto(3, "\20\0\0\0\365\3\5\0\1\0\0\0\0\0\0\0", 16, 0,
> {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 16
> poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 100) = 1
>
> recvfrom(3, "$\0\0\0\2\0\0\0\1\0\0\0\326\7\0\0\0\0\0\0\20\0\0\0\365"...,
> 8476, MSG_PEEK|MSG_DONTWAIT, {sa_family=AF_NETLINK, pid=0,
> groups=00000000}, [12]) = 36
> -> selinux_sock_recvmsg returns 0

This return code shows the kernel has data.

> I do not know enough of about the auditctl code, but to me this looks
> like auditctl is failing to issue the 3rd recvfrom syscall.

When it gets the answer, EPERM, there's no need to do anything else cause the 
kernel rejected the request.

-Steve