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netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP

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Weiming Shi says:

xt_match and xt_target structs registered with NFPROTO_UNSPEC can be
loaded by any protocol family through nft_compat. When such a
match/target sets .hooks to restrict which hooks it may run on, the
bitmask uses NF_INET_* constants. This is only correct for families
whose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge
all share the same five hooks (PRE_ROUTING ... POST_ROUTING).

ARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different
semantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks
validation silently passes for the wrong reasons, allowing matches to
run on ARP chains where the hook assumptions (e.g. state->in being
set on input hooks) do not hold. This leads to NULL pointer
dereferences; xt_devgroup is one concrete example:

 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI
 KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]
 RIP: 0010:devgroup_mt+0xff/0x350
 Call Trace:
  <TASK>
  nft_match_eval (net/netfilter/nft_compat.c:407)
  nft_do_chain (net/netfilter/nf_tables_core.c:285)
  nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61)
  nf_hook_slow (net/netfilter/core.c:623)
  arp_xmit (net/ipv4/arp.c:666)
  </TASK>
 Kernel panic - not syncing: Fatal exception in interrupt

Fix it by restricting arptables to NFPROTO_ARP extensions only.
Note that arptables-legacy only supports:

- arpt_CLASSIFY
- arpt_mangle
- arpt_MARK

that provide explicit NFPROTO_ARP match/target declarations.

Fixes: 9291747f11 ("netfilter: xtables: add device group match")
Reported-by: Xiang Mei <xmei5@asu.edu>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso
2026-03-31 16:41:25 +02:00
parent 9862ef9ab0
commit 3d5d488f11
1 changed files with 23 additions and 0 deletions
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23
net/netfilter/x_tables.c
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@@ -501,6 +501,17 @@ int xt_check_match(struct xt_mtchk_param *par,
par->match->table, par->table);
return -EINVAL;
}
/* NFPROTO_UNSPEC implies NF_INET_* hooks which do not overlap with
* NF_ARP_IN,OUT,FORWARD, allow explicit extensions with NFPROTO_ARP
* support.
*/
if (par->family == NFPROTO_ARP &&
par->match->family != NFPROTO_ARP) {
pr_info_ratelimited("%s_tables: %s match: not valid for this family\n",
xt_prefix[par->family], par->match->name);
return -EINVAL;
}
if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) {
char used[64], allow[64];
@@ -1016,6 +1027,18 @@ int xt_check_target(struct xt_tgchk_param *par,
par->target->table, par->table);
return -EINVAL;
}
/* NFPROTO_UNSPEC implies NF_INET_* hooks which do not overlap with
* NF_ARP_IN,OUT,FORWARD, allow explicit extensions with NFPROTO_ARP
* support.
*/
if (par->family == NFPROTO_ARP &&
par->target->family != NFPROTO_ARP) {
pr_info_ratelimited("%s_tables: %s target: not valid for this family\n",
xt_prefix[par->family], par->target->name);
return -EINVAL;
}
if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) {
char used[64], allow[64];