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Commit fc910a27 authored by David S. Miller's avatar David S. Miller Committed by David S. Miller
Browse files

[NETLINK]: Limit NLMSG_GOODSIZE to 8K. 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ca043569

include/linux/netlink.h

+9 −2
Original line number Diff line number Diff line
@@ -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)

include/linux/skbuff.h

+5 −3
Original line number Diff line number Diff line
@@ -39,9 +39,11 @@ 


#define SKB_DATA_ALIGN(X)	(((X) + (SMP_CACHE_BYTES - 1)) & \

				 ~(SMP_CACHE_BYTES - 1))

#define SKB_MAX_ORDER(X, ORDER)	(((PAGE_SIZE << (ORDER)) - (X) - \

				  sizeof(struct skb_shared_info)) & \

#define SKB_WITH_OVERHEAD(X)	\

	(((X) - sizeof(struct skb_shared_info)) & \

	 ~(SMP_CACHE_BYTES - 1))

#define SKB_MAX_ORDER(X, ORDER) \

	SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))

#define SKB_MAX_HEAD(X)		(SKB_MAX_ORDER((X), 0))

#define SKB_MAX_ALLOC		(SKB_MAX_ORDER(0, 2))