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| author | Florian Westphal <fw@strlen.de> | 2016-04-01 14:17:23 +0200 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-10 23:07:33 -0400 |
| commit | a471ac817cf0e0d6e87779ca1fee216ba849e613 (patch) | |
| tree | 220a52ab09a34aaaad1d92c457d0a3d5e6dc5cd1 /include | |
| parent | 8163327a3a927c36f7c032bb67957e6c0f4ec27d (diff) | |
| download | lwn-a471ac817cf0e0d6e87779ca1fee216ba849e613.tar.gz lwn-a471ac817cf0e0d6e87779ca1fee216ba849e613.zip | |
netfilter: x_tables: add and use xt_check_entry_offsets
[ Upstream commit 7d35812c3214afa5b37a675113555259cfd67b98 ]
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: Sasha Levin <sasha.levin@oracle.com>
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 a3e215bb0241..a2d150873721 100644 --- a/include/linux/netfilter/x_tables.h +++ b/include/linux/netfilter/x_tables.h @@ -239,6 +239,10 @@ 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, |