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| author | Florian Westphal <fw@strlen.de> | 2016-04-01 14:17:23 +0200 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-07-21 08:35:41 +0200 |
| commit | d1b53f828e25976196e2a3f0397c98ebe7fc330c (patch) | |
| tree | e2466cef52697fc8a1b942082952d3c8cfe6373a /include | |
| parent | 467828496aeb7452d32c045cb4e5a83a2f4fdfdc (diff) | |
| download | lwn-d1b53f828e25976196e2a3f0397c98ebe7fc330c.tar.gz lwn-d1b53f828e25976196e2a3f0397c98ebe7fc330c.zip | |
netfilter: x_tables: add and use xt_check_entry_offsets
commit 7d35812c3214afa5b37a675113555259cfd67b98 upstream.
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'include')
| -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 dd49566315c6..20ced1191c50 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -239,6 +239,10 @@ extern void xt_unregister_match(struct xt_match *target); extern int xt_register_matches(struct xt_match *match, unsigned int n); extern 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); + extern int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto, bool inv_proto); extern int xt_check_target(struct xt_tgchk_param *, |