From f21c582a940198ef810e7744c9f91cdafd1a6ed5 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 8 Jan 2010 17:31:24 +0100 Subject: netfilter: ebtables: enforce CAP_NET_ADMIN commit dce766af541f6605fa9889892c0280bab31c66ab upstream. normal users are currently allowed to set/modify ebtables rules. Restrict it to processes with CAP_NET_ADMIN. Note that this cannot be reproduced with unmodified ebtables binary because it uses SOCK_RAW. Signed-off-by: Florian Westphal Signed-off-by: Patrick McHardy Signed-off-by: Greg Kroah-Hartman --- net/bridge/netfilter/ebtables.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'net') diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c index 32afff859e4a..d6beca93e220 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -1436,6 +1436,9 @@ static int do_ebt_set_ctl(struct sock *sk, { int ret; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + switch(cmd) { case EBT_SO_SET_ENTRIES: ret = do_replace(user, len); @@ -1455,6 +1458,9 @@ static int do_ebt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) struct ebt_replace tmp; struct ebt_table *t; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (copy_from_user(&tmp, user, sizeof(tmp))) return -EFAULT; -- cgit v1.2.3