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authorDavid S. Miller <davem@davemloft.net>2007-03-26 07:27:59 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 09:23:45 +0400
commitfc910a27839584209726537698b596576940add4 (patch)
treee03b021dcb5046ffb1e8154f0f4d4bc72c4c1c1d /include/linux/netlink.h
parentca043569390c528de4cd5ec9e07502f2bf4ecd1f (diff)
downloadlinux-fc910a27839584209726537698b596576940add4.tar.xz
[NETLINK]: Limit NLMSG_GOODSIZE to 8K.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netlink.h')
-rw-r--r--include/linux/netlink.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h
index 2a20f488ac1b..a9d3ad5bc80f 100644
--- a/include/linux/netlink.h
+++ b/include/linux/netlink.h
@@ -171,9 +171,16 @@ int netlink_sendskb(struct sock *sk, struct sk_buff *skb, int protocol);
/*
* skb should fit one page. This choice is good for headerless malloc.
+ * But we should limit to 8K so that userspace does not have to
+ * use enormous buffer sizes on recvmsg() calls just to avoid
+ * MSG_TRUNC when PAGE_SIZE is very large.
*/
-#define NLMSG_GOODORDER 0
-#define NLMSG_GOODSIZE (SKB_MAX_ORDER(0, NLMSG_GOODORDER))
+#if PAGE_SIZE < 8192UL
+#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(PAGE_SIZE)
+#else
+#define NLMSG_GOODSIZE SKB_WITH_OVERHEAD(8192UL)
+#endif
+
#define NLMSG_DEFAULT_SIZE (NLMSG_GOODSIZE - NLMSG_HDRLEN)