4.19-stable review patch. If anyone has any objections, please let me know.
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From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit d0009effa8862c20a13af4cb7475d9771b905693 ]
Several expressions explicitly refer to NF_INET_* hook definitions from expr->ops->validate, however, family is not validated.
Bail out with EOPNOTSUPP in case they are used from unsupported families.
Fixes: 0ca743a55991 ("netfilter: nf_tables: add compatibility layer for x_tables") Fixes: a3c90f7a2323 ("netfilter: nf_tables: flow offload expression") Fixes: 2fa841938c64 ("netfilter: nf_tables: introduce routing expression") Fixes: 554ced0a6e29 ("netfilter: nf_tables: add support for native socket matching") Fixes: ad49d86e07a4 ("netfilter: nf_tables: Add synproxy support") Fixes: 4ed8eb6570a4 ("netfilter: nf_tables: Add native tproxy support") Fixes: 6c47260250fc ("netfilter: nf_tables: add xfrm expression") Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/nft_compat.c | 12 ++++++++++++ net/netfilter/nft_flow_offload.c | 5 +++++ net/netfilter/nft_nat.c | 5 +++++ net/netfilter/nft_rt.c | 5 +++++ net/netfilter/nft_socket.c | 5 +++++ net/netfilter/nft_tproxy.c | 5 +++++ 6 files changed, 37 insertions(+)
--- a/net/netfilter/nft_compat.c +++ b/net/netfilter/nft_compat.c @@ -319,6 +319,12 @@ static int nft_target_validate(const str unsigned int hook_mask = 0; int ret;
+ if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_BRIDGE && + ctx->family != NFPROTO_ARP) + return -EOPNOTSUPP; + if (nft_is_base_chain(ctx->chain)) { const struct nft_base_chain *basechain = nft_base_chain(ctx->chain); @@ -560,6 +566,12 @@ static int nft_match_validate(const stru unsigned int hook_mask = 0; int ret;
+ if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_BRIDGE && + ctx->family != NFPROTO_ARP) + return -EOPNOTSUPP; + if (nft_is_base_chain(ctx->chain)) { const struct nft_base_chain *basechain = nft_base_chain(ctx->chain); --- a/net/netfilter/nft_flow_offload.c +++ b/net/netfilter/nft_flow_offload.c @@ -145,6 +145,11 @@ static int nft_flow_offload_validate(con { unsigned int hook_mask = (1 << NF_INET_FORWARD);
+ if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET) + return -EOPNOTSUPP; + return nft_chain_validate_hooks(ctx->chain, hook_mask); }
--- a/net/netfilter/nft_nat.c +++ b/net/netfilter/nft_nat.c @@ -94,6 +94,11 @@ static int nft_nat_validate(const struct struct nft_nat *priv = nft_expr_priv(expr); int err;
+ if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET) + return -EOPNOTSUPP; + err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); if (err < 0) return err; --- a/net/netfilter/nft_rt.c +++ b/net/netfilter/nft_rt.c @@ -159,6 +159,11 @@ static int nft_rt_validate(const struct const struct nft_rt *priv = nft_expr_priv(expr); unsigned int hooks;
+ if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET) + return -EOPNOTSUPP; + switch (priv->key) { case NFT_RT_NEXTHOP4: case NFT_RT_NEXTHOP6: --- a/net/netfilter/nft_socket.c +++ b/net/netfilter/nft_socket.c @@ -139,6 +139,11 @@ static int nft_socket_validate(const str const struct nft_expr *expr, const struct nft_data **data) { + if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET) + return -EOPNOTSUPP; + return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) | --- a/net/netfilter/nft_tproxy.c +++ b/net/netfilter/nft_tproxy.c @@ -293,6 +293,11 @@ static int nft_tproxy_validate(const str const struct nft_expr *expr, const struct nft_data **data) { + if (ctx->family != NFPROTO_IPV4 && + ctx->family != NFPROTO_IPV6 && + ctx->family != NFPROTO_INET) + return -EOPNOTSUPP; + return nft_chain_validate_hooks(ctx->chain, 1 << NF_INET_PRE_ROUTING); }