From 544473c1664f3a688be949ac078bdee6f4afeef1 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Mon, 14 Apr 2008 11:15:45 +0200 Subject: [NETFILTER]: {ip,ip6,arp}_tables: return EAGAIN for invalid SO_GET_ENTRIES size Rule dumping is performed in two steps: first userspace gets the ruleset size using getsockopt(SO_GET_INFO) and allocates memory, then it calls getsockopt(SO_GET_ENTRIES) to actually dump the ruleset. When another process changes the ruleset in between the sizes from the first getsockopt call doesn't match anymore and the kernel aborts. Unfortunately it returns EAGAIN, as for multiple other possible errors, so userspace can't distinguish this case from real errors. Return EAGAIN so userspace can retry the operation. Fixes (with current iptables SVN version) netfilter bugzilla #104. Signed-off-by: Patrick McHardy --- net/ipv6/netfilter/ip6_tables.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/ipv6') diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index 782183f6336..0b4557e0343 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -1206,7 +1206,7 @@ get_entries(struct net *net, struct ip6t_get_entries __user *uptr, int *len) else { duprintf("get_entries: I've got %u not %u!\n", private->size, get.size); - ret = -EINVAL; + ret = -EAGAIN; } module_put(t->me); xt_table_unlock(t); @@ -1966,7 +1966,7 @@ compat_get_entries(struct net *net, struct compat_ip6t_get_entries __user *uptr, } else if (!ret) { duprintf("compat_get_entries: I've got %u not %u!\n", private->size, get.size); - ret = -EINVAL; + ret = -EAGAIN; } xt_compat_flush_offsets(AF_INET6); module_put(t->me); -- cgit v1.2.3