From 75ca20885ed80079d507fddda00b805e88258094 Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Wed, 15 Aug 2012 11:31:56 +0000 Subject: [PATCH] ipvs: fix info leak in getsockopt(IP_VS_SO_GET_TIMEOUT) commit 2d8a041b7bfe1097af21441cb77d6af95f4f4680 upstream. If at least one of CONFIG_IP_VS_PROTO_TCP or CONFIG_IP_VS_PROTO_UDP is not set, __ip_vs_get_timeouts() does not fully initialize the structure that gets copied to userland and that for leaks up to 12 bytes of kernel stack. Add an explicit memset(0) before passing the structure to __ip_vs_get_timeouts() to avoid the info leak. Signed-off-by: Mathias Krause Cc: Wensong Zhang Cc: Simon Horman Cc: Julian Anastasov Signed-off-by: David S. Miller [bwh: Backported to 2.6.32: adjust context] Signed-off-by: Willy Tarreau --- net/netfilter/ipvs/ip_vs_ctl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index 02b2610c4d2..9bcd9725dde 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -2455,6 +2455,7 @@ do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) { struct ip_vs_timeout_user t; + memset(&t, 0, sizeof(t)); __ip_vs_get_timeouts(&t); if (copy_to_user(user, &t, sizeof(t)) != 0) ret = -EFAULT; -- 2.34.1