From ebd032fa881882fef2acb9da1bbde48d8233241d Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 4 Oct 2023 13:12:58 +0200 Subject: [PATCH 1/7] netfilter: nf_tables: do not remove elements if set backend implements .abort pipapo set backend maintains two copies of the datastructure, removing the elements from the copy that is going to be discarded slows down the abort path significantly, from several minutes to few seconds after this patch. Fixes: 212ed75dc5fb ("netfilter: nf_tables: integrate pipapo into commit protocol") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal --- net/netfilter/nf_tables_api.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index a72b6aeefb1b5..c3de3791cabd2 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -10347,7 +10347,10 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action) break; } te = (struct nft_trans_elem *)trans->data; - nft_setelem_remove(net, te->set, &te->elem); + if (!te->set->ops->abort || + nft_setelem_is_catchall(te->set, &te->elem)) + nft_setelem_remove(net, te->set, &te->elem); + if (!nft_setelem_is_catchall(te->set, &te->elem)) atomic_dec(&te->set->nelems); From 2e1d175410972285333193837a4250a74cd472e6 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 5 Oct 2023 10:53:08 +0200 Subject: [PATCH 2/7] netfilter: nfnetlink_log: silence bogus compiler warning net/netfilter/nfnetlink_log.c:800:18: warning: variable 'ctinfo' is uninitialized The warning is bogus, the variable is only used if ct is non-NULL and always initialised in that case. Init to 0 too to silence this. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202309100514.ndBFebXN-lkp@intel.com/ Signed-off-by: Florian Westphal --- net/netfilter/nfnetlink_log.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index 53c9e76473ba1..f03f4d4d7d889 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -698,8 +698,8 @@ nfulnl_log_packet(struct net *net, unsigned int plen = 0; struct nfnl_log_net *log = nfnl_log_pernet(net); const struct nfnl_ct_hook *nfnl_ct = NULL; + enum ip_conntrack_info ctinfo = 0; struct nf_conn *ct = NULL; - enum ip_conntrack_info ctinfo; if (li_user && li_user->type == NF_LOG_TYPE_ULOG) li = li_user; From d51c42cdef5f961f63e39e172e4dfdcac54acd5e Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 3 Oct 2023 16:17:51 -0700 Subject: [PATCH 3/7] netfilter: nf_tables: Annotate struct nft_pipapo_match with __counted_by Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct nft_pipapo_match. Cc: Pablo Neira Ayuso Cc: Jozsef Kadlecsik Cc: Florian Westphal Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netfilter-devel@vger.kernel.org Cc: coreteam@netfilter.org Cc: netdev@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Signed-off-by: Florian Westphal --- net/netfilter/nft_set_pipapo.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nft_set_pipapo.h b/net/netfilter/nft_set_pipapo.h index 25a75591583eb..2e164a319945f 100644 --- a/net/netfilter/nft_set_pipapo.h +++ b/net/netfilter/nft_set_pipapo.h @@ -147,7 +147,7 @@ struct nft_pipapo_match { unsigned long * __percpu *scratch; size_t bsize_max; struct rcu_head rcu; - struct nft_pipapo_field f[]; + struct nft_pipapo_field f[] __counted_by(field_count); }; /** From 4c90bba60c26db7dc7df450f748e86440149786e Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Mon, 2 Oct 2023 11:57:42 +0200 Subject: [PATCH 4/7] netfilter: nf_tables: do not refresh timeout when resetting element The dump and reset command should not refresh the timeout, this command is intended to allow users to list existing stateful objects and reset them, element expiration should be refresh via transaction instead with a specific command to achieve this, otherwise this is entering combo semantics that will be hard to be undone later (eg. a user asking to retrieve counters but _not_ requiring to refresh expiration). Fixes: 079cd633219d ("netfilter: nf_tables: Introduce NFT_MSG_GETSETELEM_RESET") Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal --- net/netfilter/nf_tables_api.c | 18 +++++------------- 1 file changed, 5 insertions(+), 13 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index c3de3791cabd2..aae6ffebb413c 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5556,7 +5556,6 @@ static int nf_tables_fill_setelem(struct sk_buff *skb, const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); unsigned char *b = skb_tail_pointer(skb); struct nlattr *nest; - u64 timeout = 0; nest = nla_nest_start_noflag(skb, NFTA_LIST_ELEM); if (nest == NULL) @@ -5592,15 +5591,11 @@ static int nf_tables_fill_setelem(struct sk_buff *skb, htonl(*nft_set_ext_flags(ext)))) goto nla_put_failure; - if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT)) { - timeout = *nft_set_ext_timeout(ext); - if (nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, - nf_jiffies64_to_msecs(timeout), - NFTA_SET_ELEM_PAD)) - goto nla_put_failure; - } else if (set->flags & NFT_SET_TIMEOUT) { - timeout = READ_ONCE(set->timeout); - } + if (nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) && + nla_put_be64(skb, NFTA_SET_ELEM_TIMEOUT, + nf_jiffies64_to_msecs(*nft_set_ext_timeout(ext)), + NFTA_SET_ELEM_PAD)) + goto nla_put_failure; if (nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION)) { u64 expires, now = get_jiffies_64(); @@ -5615,9 +5610,6 @@ static int nf_tables_fill_setelem(struct sk_buff *skb, nf_jiffies64_to_msecs(expires), NFTA_SET_ELEM_PAD)) goto nla_put_failure; - - if (reset) - *nft_set_ext_expiration(ext) = now + timeout; } if (nft_set_ext_exists(ext, NFT_SET_EXT_USERDATA)) { From 52177bbf19e6e9398375a148d2e13ed492b40b80 Mon Sep 17 00:00:00 2001 From: Xingyuan Mo Date: Mon, 9 Oct 2023 18:36:14 +0800 Subject: [PATCH 5/7] nf_tables: fix NULL pointer dereference in nft_inner_init() We should check whether the NFTA_INNER_NUM netlink attribute is present before accessing it, otherwise a null pointer deference error will occur. Call Trace: dump_stack_lvl+0x4f/0x90 print_report+0x3f0/0x620 kasan_report+0xcd/0x110 __asan_load4+0x84/0xa0 nft_inner_init+0x128/0x2e0 nf_tables_newrule+0x813/0x1230 nfnetlink_rcv_batch+0xec3/0x1170 nfnetlink_rcv+0x1e4/0x220 netlink_unicast+0x34e/0x4b0 netlink_sendmsg+0x45c/0x7e0 __sys_sendto+0x355/0x370 __x64_sys_sendto+0x84/0xa0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Fixes: 3a07327d10a0 ("netfilter: nft_inner: support for inner tunnel header matching") Signed-off-by: Xingyuan Mo Signed-off-by: Florian Westphal --- net/netfilter/nft_inner.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/netfilter/nft_inner.c b/net/netfilter/nft_inner.c index 28e2873ba24e4..928312d01eb1d 100644 --- a/net/netfilter/nft_inner.c +++ b/net/netfilter/nft_inner.c @@ -298,6 +298,7 @@ static int nft_inner_init(const struct nft_ctx *ctx, int err; if (!tb[NFTA_INNER_FLAGS] || + !tb[NFTA_INNER_NUM] || !tb[NFTA_INNER_HDRSIZE] || !tb[NFTA_INNER_TYPE] || !tb[NFTA_INNER_EXPR]) From 505ce0630ad5d31185695f8a29dde8d29f28faa7 Mon Sep 17 00:00:00 2001 From: Xingyuan Mo Date: Mon, 9 Oct 2023 18:36:15 +0800 Subject: [PATCH 6/7] nf_tables: fix NULL pointer dereference in nft_expr_inner_parse() We should check whether the NFTA_EXPR_NAME netlink attribute is present before accessing it, otherwise a null pointer deference error will occur. Call Trace: dump_stack_lvl+0x4f/0x90 print_report+0x3f0/0x620 kasan_report+0xcd/0x110 __asan_load2+0x7d/0xa0 nla_strcmp+0x2f/0x90 __nft_expr_type_get+0x41/0xb0 nft_expr_inner_parse+0xe3/0x200 nft_inner_init+0x1be/0x2e0 nf_tables_newrule+0x813/0x1230 nfnetlink_rcv_batch+0xec3/0x1170 nfnetlink_rcv+0x1e4/0x220 netlink_unicast+0x34e/0x4b0 netlink_sendmsg+0x45c/0x7e0 __sys_sendto+0x355/0x370 __x64_sys_sendto+0x84/0xa0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Fixes: 3a07327d10a0 ("netfilter: nft_inner: support for inner tunnel header matching") Signed-off-by: Xingyuan Mo Signed-off-by: Florian Westphal --- net/netfilter/nf_tables_api.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index aae6ffebb413c..a623d31b6518f 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3166,7 +3166,7 @@ int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla, if (err < 0) return err; - if (!tb[NFTA_EXPR_DATA]) + if (!tb[NFTA_EXPR_DATA] || !tb[NFTA_EXPR_NAME]) return -EINVAL; type = __nft_expr_type_get(ctx->family, tb[NFTA_EXPR_NAME]); From d351c1ea2de3e36e608fc355d8ae7d0cc80e6cd6 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Sun, 8 Oct 2023 19:36:53 +0200 Subject: [PATCH 7/7] netfilter: nft_payload: fix wrong mac header matching MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit mcast packets get looped back to the local machine. Such packets have a 0-length mac header, we should treat this like "mac header not set" and abort rule evaluation. As-is, we just copy data from the network header instead. Fixes: 96518518cc41 ("netfilter: add nftables") Reported-by: Blažej Krajňák Signed-off-by: Florian Westphal --- net/netfilter/nft_payload.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index 120f6d395b98b..0a689c8e0295d 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -179,7 +179,7 @@ void nft_payload_eval(const struct nft_expr *expr, switch (priv->base) { case NFT_PAYLOAD_LL_HEADER: - if (!skb_mac_header_was_set(skb)) + if (!skb_mac_header_was_set(skb) || skb_mac_header_len(skb) == 0) goto err; if (skb_vlan_tag_present(skb) &&