lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 1 Aug 2022 15:02:21 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Florian Westphal <fw@...len.de>, Pablo Neira Ayuso <pablo@...filter.org>, Sasha Levin <sashal@...nel.org>, kadlec@...filter.org, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, netfilter-devel@...r.kernel.org, coreteam@...filter.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 5.18 09/10] netfilter: nft_queue: only allow supported familes and hooks From: Florian Westphal <fw@...len.de> [ Upstream commit 47f4f510ad586032b85c89a0773fbb011d412425 ] Trying to use 'queue' statement in ingress (for example) triggers a splat on reinject: WARNING: CPU: 3 PID: 1345 at net/netfilter/nf_queue.c:291 ... because nf_reinject cannot find the ruleset head. The netdev family doesn't support async resume at the moment anyway, so disallow loading such rulesets with a more appropriate error message. v2: add 'validate' callback and also check hook points, v1 did allow ingress use in 'table inet', but that doesn't work either. (Pablo) Signed-off-by: Florian Westphal <fw@...len.de> Reviewed-by: Pablo Neira Ayuso <pablo@...filter.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- net/netfilter/nft_queue.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/net/netfilter/nft_queue.c b/net/netfilter/nft_queue.c index 15e4b7640dc0..da29e92c03e2 100644 --- a/net/netfilter/nft_queue.c +++ b/net/netfilter/nft_queue.c @@ -68,6 +68,31 @@ static void nft_queue_sreg_eval(const struct nft_expr *expr, regs->verdict.code = ret; } +static int nft_queue_validate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nft_data **data) +{ + static const unsigned int supported_hooks = ((1 << NF_INET_PRE_ROUTING) | + (1 << NF_INET_LOCAL_IN) | + (1 << NF_INET_FORWARD) | + (1 << NF_INET_LOCAL_OUT) | + (1 << NF_INET_POST_ROUTING)); + + switch (ctx->family) { + case NFPROTO_IPV4: + case NFPROTO_IPV6: + case NFPROTO_INET: + case NFPROTO_BRIDGE: + break; + case NFPROTO_NETDEV: /* lacks okfn */ + fallthrough; + default: + return -EOPNOTSUPP; + } + + return nft_chain_validate_hooks(ctx->chain, supported_hooks); +} + static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = { [NFTA_QUEUE_NUM] = { .type = NLA_U16 }, [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 }, @@ -164,6 +189,7 @@ static const struct nft_expr_ops nft_queue_ops = { .eval = nft_queue_eval, .init = nft_queue_init, .dump = nft_queue_dump, + .validate = nft_queue_validate, .reduce = NFT_REDUCE_READONLY, }; @@ -173,6 +199,7 @@ static const struct nft_expr_ops nft_queue_sreg_ops = { .eval = nft_queue_sreg_eval, .init = nft_queue_sreg_init, .dump = nft_queue_sreg_dump, + .validate = nft_queue_validate, .reduce = NFT_REDUCE_READONLY, }; -- 2.35.1
Powered by blists - more mailing lists