From b8db4a27bc0a30cdbd60b86f3e0aceabb9a0ee7f Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Date: Tue, 23 Aug 2022 02:28:06 +0000
Subject: [PATCH] netfilter: nf_tables: do not allow RULE_ID to refer to
another chain
mainline inclusion
from mainline-v6.0-rc1
commit 36d5b2913219ac853908b0f1c664345e04313856
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5MEZD
CVE: CVE-2022-2586
--------------------------------
When doing lookups for rules on the same batch by using its ID, a rule from
a different chain can be used. If a rule is added to a chain but tries to
be positioned next to a rule from a different chain, it will be linked to
chain2, but the use counter on chain1 would be the one to be incremented.
When looking for rules by ID, use the chain that was used for the lookup by
name. The chain used in the context copied to the transaction needs to
match that same chain. That way, struct nft_rule does not need to get
enlarged with another member.
Fixes: 1a94e38d254b ("netfilter: nf_tables: add NFTA_RULE_ID attribute")
Fixes: 75dd48e2e420 ("netfilter: nf_tables: Support RULE_ID reference in new rule")
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
conflict:
net/netfilter/nf_tables_api.c
Signed-off-by: Lu Wei <luwei32@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Wang Weiyang <wangweiyang2@huawei.com>
Reviewed-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
---
net/netfilter/nf_tables_api.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index ea9039ee8098..f85327ff7637 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2768,6 +2768,7 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
}
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
+ const struct nft_chain *chain,
const struct nlattr *nla)
{
u32 id = ntohl(nla_get_be32(nla));
@@ -2777,6 +2778,7 @@ static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
struct nft_rule *rule = nft_trans_rule(trans);
if (trans->msg_type == NFT_MSG_NEWRULE &&
+ trans->ctx.chain == chain &&
id == nft_trans_rule_id(trans))
return rule;
}
@@ -2823,7 +2825,7 @@ static int nf_tables_delrule(struct net *net, struct sock *nlsk,
err = nft_delrule(&ctx, rule);
} else if (nla[NFTA_RULE_ID]) {
- rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_ID]);
+ rule = nft_rule_lookup_byid(net, chain, nla[NFTA_RULE_ID]);
if (IS_ERR(rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_ID]);
return PTR_ERR(rule);
--
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