diff options
| author | Phil Sutter <phil@nwl.cc> | 2023-09-13 15:51:36 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2023-09-13 21:57:50 +0200 |
| commit | 7fb818f248cff996180b7cdcdcb86b6b4f6e44e2 (patch) | |
| tree | 6b5cda6709441c06f1cbf075770f59131c9183d8 | |
| parent | 4908d5af16676b9d2901830551c2af911e452524 (diff) | |
netfilter: nf_tables: Fix entries val in rule reset audit log
The value in idx and the number of rules handled in that particular
__nf_tables_dump_rules() call is not identical. The former is a cursor
to pick up from if multiple netlink messages are needed, so its value is
ever increasing. Fixing this is not just a matter of subtracting s_idx
from it, though: When resetting rules in multiple chains,
__nf_tables_dump_rules() is called for each and cb->args[0] is not
adjusted in between. Introduce a dedicated counter to record the number
of rules reset in this call in a less confusing way.
While being at it, prevent the direct return upon buffer exhaustion: Any
rules previously dumped into that skb would evade audit logging
otherwise.
Fixes: 9b5ba5c9c5109 ("netfilter: nf_tables: Unbreak audit log reset")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index c1e485aee763..d819b4d42962 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3451,6 +3451,8 @@ static int __nf_tables_dump_rules(struct sk_buff *skb, struct net *net = sock_net(skb->sk); const struct nft_rule *rule, *prule; unsigned int s_idx = cb->args[0]; + unsigned int entries = 0; + int ret = 0; u64 handle; prule = NULL; @@ -3473,9 +3475,11 @@ static int __nf_tables_dump_rules(struct sk_buff *skb, NFT_MSG_NEWRULE, NLM_F_MULTI | NLM_F_APPEND, table->family, - table, chain, rule, handle, reset) < 0) - return 1; - + table, chain, rule, handle, reset) < 0) { + ret = 1; + break; + } + entries++; nl_dump_check_consistent(cb, nlmsg_hdr(skb)); cont: prule = rule; @@ -3483,10 +3487,10 @@ cont_skip: (*idx)++; } - if (reset && *idx) - audit_log_rule_reset(table, cb->seq, *idx); + if (reset && entries) + audit_log_rule_reset(table, cb->seq, entries); - return 0; + return ret; } static int nf_tables_dump_rules(struct sk_buff *skb, |