bugzilla-daemon at netfilter.org
2023-Nov-10 12:42 UTC
[Bug 1723] New: ebtables-nft help output woes
https://bugzilla.netfilter.org/show_bug.cgi?id=1723
Bug ID: 1723
Summary: ebtables-nft help output woes
Product: ebtables
Version: unspecified
Hardware: x86_64
OS: All
Status: NEW
Severity: enhancement
Priority: P5
Component: ebtables-nft
Assignee: pablo at netfilter.org
Reporter: phil at nwl.cc
The list of extensions returned from 'ebtables-nft -h list_extensions'
is more
than incomplete:
| # ebtables -h list_extensions
| ebtables v1.8.10 (nf_tables)
| Loaded userspace extensions:
|
| Loaded targets:
| nflog
| log
|
| Loaded matches:
Listing most extensions does not work:
| # ebtables -h 802_3
| ebtables v1.8.10 (nf_tables): Extension '802_3' not found
| Try `ebtables -h' or 'ebtables --help' for more information.
Those that work, cause double free at program exit:
| # ebtables -h nflog
| ebtables 1.8.10 (nf_tables)
| [...]
| nflog options:
| --nflog : use the default nflog parameters
| --nflog-prefix prefix : Prefix string for log message
| --nflog-group group : NETLINK group used for logging
| --nflog-range range : Number of byte to copy
| --nflog-threshold : Message threshold ofin-kernel queue
| free(): double free detected in tcache 2
| zsh: IOT instruction sudo ../../../install/sbin/ebtables -h nflog
It is caused by nft_fini() freeing 'target->t' in xtables_targets
list which
apparently has been freed already by ebt_cs_clean(). Maybe the
xtables_find_target() call is bad?
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