diff options
| author |   Florian Westphal <fw@strlen.de> | 2016-04-01 14:17:23 +0200 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2016-04-14 00:30:35 +0200 |
| commit | 7d35812c3214afa5b37a675113555259cfd67b98 (patch) | |
| tree | bf58d19850c9a9da5c42e5f6a66588a6b5972059 /include/linux/netfilter | |
| parent | netfilter: x_tables: validate targets of jumps (diff) | |
| download | linux-dev-7d35812c3214afa5b37a675113555259cfd67b98.tar.xz linux-dev-7d35812c3214afa5b37a675113555259cfd67b98.zip | |
netfilter: x_tables: add and use xt_check_entry_offsets
Currently arp/ip and ip6tables each implement a short helper to check that
the target offset is large enough to hold one xt_entry_target struct and
that t->u.target_size fits within the current rule.
Unfortunately these checks are not sufficient.
To avoid adding new tests to all of ip/ip6/arptables move the current
checks into a helper, then extend this helper in followup patches.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/linux/netfilter')
| -rw-r--r-- | include/linux/netfilter/x_tables.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h index 80a305b85323..0de0862897a4 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -242,6 +242,10 @@ void xt_unregister_match(struct xt_match *target); int xt_register_matches(struct xt_match *match, unsigned int n); void xt_unregister_matches(struct xt_match *match, unsigned int n); +int xt_check_entry_offsets(const void *base, + unsigned int target_offset, + unsigned int next_offset); + int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto, bool inv_proto); int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto, |