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e34b9ed96c
linux/include/net/netfilter
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Florian Westphal e34b9ed96c netfilter: nf_tables: avoid skb access on nf_stolen 
When verdict is NF_STOLEN, the skb might have been freed.

When tracing is enabled, this can result in a use-after-free:
1. access to skb->nf_trace
2. access to skb->mark
3. computation of trace id
4. dump of packet payload

To avoid 1, keep a cached copy of skb->nf_trace in the
trace state struct.
Refresh this copy whenever verdict is != STOLEN.

Avoid 2 by skipping skb->mark access if verdict is STOLEN.

3 is avoided by precomputing the trace id.

Only dump the packet when verdict is not "STOLEN".

Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2022-06-27 19:22:54 +02:00
..
ipv4 netfilter: disable defrag once its no longer needed 2021-04-26 03:20:07 +02:00
ipv6 netfilter: conntrack: fix boot failure with nf_conntrack.enable_hooks=1 2021-09-28 13:04:55 +02:00
br_netfilter.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack_acct.h netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_act_ct.h net/sched: act_ct: Fill offloading tuple iifidx 2022-01-04 12:12:55 +00:00
nf_conntrack_bpf.h net/netfilter: Add unstable CT lookup helpers for XDP and TC-BPF 2022-01-18 14:26:42 -08:00
nf_conntrack_bridge.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack_core.h netfilter: conntrack: re-fetch conntrack after insertion 2022-05-27 11:16:34 +02:00
nf_conntrack_count.h netfilter: nf_conncount: reduce unnecessary GC 2022-05-16 13:05:40 +02:00
nf_conntrack_ecache.h netfilter: prefer extension check to pointer check 2022-05-13 18:56:28 +02:00
nf_conntrack_expect.h netfilter: fix coding-style errors. 2019-09-13 11:39:38 +02:00
nf_conntrack_extend.h netfilter: extensions: introduce extension genid count 2022-05-13 18:52:16 +02:00
nf_conntrack_helper.h netfilter: conntrack: Add and use nf_ct_set_auto_assign_helper_warned() 2022-03-20 00:29:35 +01:00
nf_conntrack_l4proto.h netfilter: conntrack: pass hook state to log functions 2021-06-18 14:47:43 +02:00
nf_conntrack_labels.h netfilter: extensions: introduce extension genid count 2022-05-13 18:52:16 +02:00
nf_conntrack_seqadj.h netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_synproxy.h netfilter: conntrack: wrap two inline functions in config checks. 2019-09-13 12:47:10 +02:00
nf_conntrack_timeout.h netfilter: cttimeout: decouple unlink and free on netns destruction 2022-05-13 18:52:16 +02:00
nf_conntrack_timestamp.h netfilter: conntrack: remove extension register api 2022-02-04 06:30:28 +01:00
nf_conntrack_tuple.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_conntrack_zones.h netfilter: conntrack: remove CONFIG_NF_CONNTRACK checks from nf_conntrack_zones.h. 2019-09-13 12:47:41 +02:00
nf_conntrack.h netfilter: conntrack: add nf_ct_iter_data object for nf_ct_iterate_cleanup*() 2022-05-13 18:56:27 +02:00
nf_dup_netdev.h netfilter: nft_{fwd,dup}_netdev: add offload support 2019-09-10 22:44:29 +02:00
nf_flow_table.h netfilter: flowtable: Fix QinQ and pppoe support for inet table 2022-03-16 11:25:04 +01:00
nf_hooks_lwtunnel.h netfilter: add netfilter hooks to SRv6 data plane 2021-08-30 01:51:36 +02:00
nf_log.h netfilter: nf_log_common: merge with nf_log_syslog 2021-03-31 22:34:10 +02:00
nf_nat_helper.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
nf_nat_masquerade.h netfilter: update include directives. 2019-09-13 12:33:06 +02:00
nf_nat_redirect.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
nf_nat.h netfilter: nat: move nf_xfrm_me_harder to where it is used 2021-04-26 03:20:07 +02:00
nf_queue.h netfilter: nf_queue: fix possible use-after-free 2022-03-01 11:50:35 +01:00
nf_reject.h netfilter: conntrack: skip verification of zero UDP checksum 2022-05-13 18:56:28 +02:00
nf_socket.h netfilter: Decrease code duplication regarding transparent socket option 2018-06-03 00:02:01 +02:00
nf_synproxy.h netfilter: remove CONFIG_NETFILTER checks from headers. 2019-09-13 12:47:36 +02:00
nf_tables_core.h netfilter: nft_cmp: optimize comparison for 16-bytes 2022-02-09 12:00:28 +01:00
nf_tables_ipv4.h netfilter: nf_tables: convert pktinfo->tprot_set to flags field 2021-11-01 09:30:20 +01:00
nf_tables_ipv6.h netfilter: nf_tables: convert pktinfo->tprot_set to flags field 2021-11-01 09:30:20 +01:00
nf_tables_offload.h netfilter: nf_tables: bail out early if hardware offload is not supported 2022-06-06 19:19:15 +02:00
nf_tables.h netfilter: nf_tables: avoid skb access on nf_stolen 2022-06-27 19:22:54 +02:00
nf_tproxy.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2018-07-20 22:28:28 -07:00
nft_fib.h netfilter: nft_fib: add reduce support 2022-03-20 00:29:47 +01:00
nft_meta.h netfilter: nft_meta: extend reduce support to bridge family 2022-03-20 00:29:46 +01:00
nft_reject.h netfilter: add missing includes to a number of header-files. 2019-08-13 12:14:39 +02:00
xt_rateest.h net: sched: Merge Qdisc::bstats and Qdisc::cpu_bstats data types 2021-10-18 12:54:41 +01:00