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authorEric Paris <eparis@redhat.com>2009-06-11 14:31:35 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-06-23 23:50:40 -0400
commitea7ae60bfe39aeedfb29571c47280bf0067ee5f3 (patch)
treedae18e879a4e6d5c2ae53cf89267a6045db49da7 /kernel
parentee080e6ce93d5993390bccf68c1df5efd9351276 (diff)
downloadlinux-2.6.34-ux500-ea7ae60bfe39aeedfb29571c47280bf0067ee5f3.tar.gz
Audit: clean up audit_receive_skb
audit_receive_skb is hard to clearly parse what it is doing to the netlink message. Clean the function up so it is easy and clear to see what is going on. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/audit.c35
1 files changed, 18 insertions, 17 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 01082a1d2bc..ce77e81a0e7 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -937,28 +937,29 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
/*
- * Get message from skb (based on rtnetlink_rcv_skb). Each message is
- * processed by audit_receive_msg. Malformed skbs with wrong length are
- * discarded silently.
+ * Get message from skb. Each message is processed by audit_receive_msg.
+ * Malformed skbs with wrong length are discarded silently.
*/
static void audit_receive_skb(struct sk_buff *skb)
{
- int err;
- struct nlmsghdr *nlh;
- u32 rlen;
+ struct nlmsghdr *nlh;
+ /*
+ * len MUST be signed for NLMSG_NEXT to be able to dec it below 0
+ * if the nlmsg_len was not aligned
+ */
+ int len;
+ int err;
- while (skb->len >= NLMSG_SPACE(0)) {
- nlh = nlmsg_hdr(skb);
- if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
- return;
- rlen = NLMSG_ALIGN(nlh->nlmsg_len);
- if (rlen > skb->len)
- rlen = skb->len;
- if ((err = audit_receive_msg(skb, nlh))) {
+ nlh = nlmsg_hdr(skb);
+ len = skb->len;
+
+ while (NLMSG_OK(nlh, len)) {
+ err = audit_receive_msg(skb, nlh);
+ /* if err or if this message says it wants a response */
+ if (err || (nlh->nlmsg_flags & NLM_F_ACK))
netlink_ack(skb, nlh, err);
- } else if (nlh->nlmsg_flags & NLM_F_ACK)
- netlink_ack(skb, nlh, 0);
- skb_pull(skb, rlen);
+
+ nlh = NLMSG_NEXT(nlh, len);
}
}