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authorXiao Liang <shaw.leon@gmail.com>2022-08-19 10:40:23 +0800
committerFlorian Westphal <fw@strlen.de>2022-08-19 08:10:06 +0200
commit9a20f17a7a82ce5ba47047e6c3d2fc921cc1087d (patch)
tree900a1c2cc23915acba34842bb3a5c6d28a50ef9b /files/nftables/ipv6-security
parent7526881a6bbf874c0998fc9cea1646b5354596ce (diff)
src: Don't parse string as verdict in mapHEADmaster
In verdict map, string values are accidentally treated as verdicts. For example: table t { map foo { type ipv4_addr : verdict elements = { 192.168.0.1 : bar } } chain output { type filter hook output priority mangle; ip daddr vmap @foo } } Though "bar" is not a valid verdict (should be "jump bar" or something), the string is taken as the element value. Then NFTA_DATA_VALUE is sent to the kernel instead of NFTA_DATA_VERDICT. This would be rejected by recent kernels. On older ones (e.g. v5.4.x) that don't validate the type, a warning can be seen when the rule is hit, because of the corrupted verdict value: [5120263.467627] WARNING: CPU: 12 PID: 303303 at net/netfilter/nf_tables_core.c:229 nft_do_chain+0x394/0x500 [nf_tables] Indeed, we don't parse verdicts during evaluation, but only chain names, which is of type string rather than verdict. For example, "jump $var" is a verdict while "$var" is a string. Fixes: c64457cff967 ("src: Allow goto and jump to a variable") Signed-off-by: Xiao Liang <shaw.leon@gmail.com> Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'files/nftables/ipv6-security')
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