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authorDmitry Mishin <dim@openvz.org>2006-12-05 13:43:50 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-06 18:39:02 -0800
commit74c9c0c17dea729d6089c0c82762babd02e65f84 (patch)
treefa3c59bcd8121b469013b49963fb561f0fa30903 /net/ipv6
parent79066ad32be5bb2edf16733aec36acf2af03fc99 (diff)
[NETFILTER]: Fix {ip,ip6,arp}_tables hook validation
Commit 590bdf7fd2292b47c428111cb1360e312eff207e introduced a regression in match/target hook validation. mark_source_chains builds a bitmask for each rule representing the hooks it can be reached from, which is then used by the matches and targets to make sure they are only called from valid hooks. The patch moved the match/target specific validation before the mark_source_chains call, at which point the mask is always zero. This patch returns back to the old order and moves the standard checks to mark_source_chains. This allows to get rid of a special case for standard targets as a nice side-effect. Signed-off-by: Dmitry Mishin <dim@openvz.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c59
1 files changed, 23 insertions, 36 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index f63fb86d7c7b..4eec4b3988b8 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -440,6 +440,13 @@ mark_source_chains(struct xt_table_info *newinfo,
&& unconditional(&e->ipv6)) {
unsigned int oldpos, size;
+ if (t->verdict < -NF_MAX_VERDICT - 1) {
+ duprintf("mark_source_chains: bad "
+ "negative verdict (%i)\n",
+ t->verdict);
+ return 0;
+ }
+
/* Return: backtrack through the last
big jump. */
do {
@@ -477,6 +484,13 @@ mark_source_chains(struct xt_table_info *newinfo,
if (strcmp(t->target.u.user.name,
IP6T_STANDARD_TARGET) == 0
&& newpos >= 0) {
+ if (newpos > newinfo->size -
+ sizeof(struct ip6t_entry)) {
+ duprintf("mark_source_chains: "
+ "bad verdict (%i)\n",
+ newpos);
+ return 0;
+ }
/* This a jump; chase it. */
duprintf("Jump rule %u -> %u\n",
pos, newpos);
@@ -509,27 +523,6 @@ cleanup_match(struct ip6t_entry_match *m, unsigned int *i)
}
static inline int
-standard_check(const struct ip6t_entry_target *t,
- unsigned int max_offset)
-{
- struct ip6t_standard_target *targ = (void *)t;
-
- /* Check standard info. */
- if (targ->verdict >= 0
- && targ->verdict > max_offset - sizeof(struct ip6t_entry)) {
- duprintf("ip6t_standard_check: bad verdict (%i)\n",
- targ->verdict);
- return 0;
- }
- if (targ->verdict < -NF_MAX_VERDICT - 1) {
- duprintf("ip6t_standard_check: bad negative verdict (%i)\n",
- targ->verdict);
- return 0;
- }
- return 1;
-}
-
-static inline int
check_match(struct ip6t_entry_match *m,
const char *name,
const struct ip6t_ip6 *ipv6,
@@ -616,12 +609,7 @@ check_entry(struct ip6t_entry *e, const char *name, unsigned int size,
if (ret)
goto err;
- if (t->u.kernel.target == &ip6t_standard_target) {
- if (!standard_check(t, size)) {
- ret = -EINVAL;
- goto err;
- }
- } else if (t->u.kernel.target->checkentry
+ if (t->u.kernel.target->checkentry
&& !t->u.kernel.target->checkentry(name, e, target, t->data,
e->comefrom)) {
duprintf("ip_tables: check failed for `%s'.\n",
@@ -758,17 +746,19 @@ translate_table(const char *name,
}
}
+ if (!mark_source_chains(newinfo, valid_hooks, entry0))
+ return -ELOOP;
+
/* Finally, each sanity check must pass */
i = 0;
ret = IP6T_ENTRY_ITERATE(entry0, newinfo->size,
check_entry, name, size, &i);
- if (ret != 0)
- goto cleanup;
-
- ret = -ELOOP;
- if (!mark_source_chains(newinfo, valid_hooks, entry0))
- goto cleanup;
+ if (ret != 0) {
+ IP6T_ENTRY_ITERATE(entry0, newinfo->size,
+ cleanup_entry, &i);
+ return ret;
+ }
/* And one copy for every other CPU */
for_each_possible_cpu(i) {
@@ -777,9 +767,6 @@ translate_table(const char *name,
}
return 0;
-cleanup:
- IP6T_ENTRY_ITERATE(entry0, newinfo->size, cleanup_entry, &i);
- return ret;
}
/* Gets counters. */