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[NETFILTER]: Fix iptables compat hook validation 

In compat mode, matches and targets valid hooks checks always successful due
to not initialized e->comefrom field yet. This patch separates this checks from
translation code and moves them after mark_source_chains() call, where these
marks are initialized.

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>
This commit is contained in:
Dmitry Mishin 2006-12-05 13:44:07 -08:00 committed by David S. Miller
parent 74c9c0c17d
commit f6677f4312
1 changed files with 51 additions and 27 deletions
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78
net/ipv4/netfilter/ip_tables.c
View File

@ -1516,25 +1516,8 @@ static inline int compat_copy_match_from_user(struct ipt_entry_match *m,
void **dstptr, compat_uint_t *size, const char *name,
const struct ipt_ip *ip, unsigned int hookmask)
{
struct ipt_entry_match *dm;
struct ipt_match *match;
int ret;
dm = (struct ipt_entry_match *)*dstptr;
match = m->u.kernel.match;
xt_compat_match_from_user(m, dstptr, size);
ret = xt_check_match(match, AF_INET, dm->u.match_size - sizeof(*dm),
name, hookmask, ip->proto,
ip->invflags & IPT_INV_PROTO);
if (!ret && m->u.kernel.match->checkentry
&& !m->u.kernel.match->checkentry(name, ip, match, dm->data,
hookmask)) {
duprintf("ip_tables: check failed for `%s'.\n",
m->u.kernel.match->name);
ret = -EINVAL;
}
return ret;
return 0;
}
static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr,
@ -1556,7 +1539,7 @@ static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr,
ret = IPT_MATCH_ITERATE(e, compat_copy_match_from_user, dstptr, size,
name, &de->ip, de->comefrom);
if (ret)
goto err;
return ret;
de->target_offset = e->target_offset - (origsize - *size);
t = ipt_get_target(e);
target = t->u.kernel.target;
@ -1569,26 +1552,62 @@ static int compat_copy_entry_from_user(struct ipt_entry *e, void **dstptr,
if ((unsigned char *)de - base < newinfo->underflow[h])
newinfo->underflow[h] -= origsize - *size;
}
return ret;
}
t = ipt_get_target(de);
static inline int compat_check_match(struct ipt_entry_match *m, const char *name,
const struct ipt_ip *ip, unsigned int hookmask)
{
struct ipt_match *match;
int ret;
match = m->u.kernel.match;
ret = xt_check_match(match, AF_INET, m->u.match_size - sizeof(*m),
name, hookmask, ip->proto,
ip->invflags & IPT_INV_PROTO);
if (!ret && m->u.kernel.match->checkentry
&& !m->u.kernel.match->checkentry(name, ip, match, m->data,
hookmask)) {
duprintf("ip_tables: compat: check failed for `%s'.\n",
m->u.kernel.match->name);
ret = -EINVAL;
}
return ret;
}
static inline int compat_check_target(struct ipt_entry *e, const char *name)
{
struct ipt_entry_target *t;
struct ipt_target *target;
int ret;
t = ipt_get_target(e);
target = t->u.kernel.target;
ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
name, e->comefrom, e->ip.proto,
e->ip.invflags & IPT_INV_PROTO);
if (ret)
goto err;
if (t->u.kernel.target->checkentry
&& !t->u.kernel.target->checkentry(name, de, target,
t->data, de->comefrom)) {
if (!ret && t->u.kernel.target->checkentry
&& !t->u.kernel.target->checkentry(name, e, target,
t->data, e->comefrom)) {
duprintf("ip_tables: compat: check failed for `%s'.\n",
t->u.kernel.target->name);
ret = -EINVAL;
}
err:
return ret;
}
static inline int compat_check_entry(struct ipt_entry *e, const char *name)
{
int ret;
ret = IPT_MATCH_ITERATE(e, compat_check_match, name, &e->ip,
e->comefrom);
if (ret)
return ret;
return compat_check_target(e, name);
}
static int
translate_compat_table(const char *name,
unsigned int valid_hooks,
@ -1677,6 +1696,11 @@ translate_compat_table(const char *name,
if (!mark_source_chains(newinfo, valid_hooks, entry1))
goto free_newinfo;
ret = IPT_ENTRY_ITERATE(entry1, newinfo->size, compat_check_entry,
name);
if (ret)
goto free_newinfo;
/* And one copy for every other CPU */
for_each_possible_cpu(i)
if (newinfo->entries[i] && newinfo->entries[i] != entry1)