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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

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Pablo Neira Ayuso says:

====================
Netfilter fixes for net-next

This is a pull request to address fallout from previous nf-next pull
request, only fixes going on here:

1) Address a potential null dereference in nf_unregister_net_hook()
   when becomes nf_hook_entry_head is NULL, from Aaron Conole.

2) Missing ifdef for CONFIG_NETFILTER_INGRESS, also from Aaron.

3) Fix linking problems in xt_hashlimit in x86_32, from Pai.

4) Fix permissions of nf_log sysctl from unpriviledge netns, from
   Jann Horn.

5) Fix possible divide by zero in nft_limit, from Liping Zhang.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2016-10-05 20:15:55 -04:00
commit 5bfb88a163
4 changed files with 26 additions and 16 deletions
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17
net/netfilter/core.c
View File

@ -90,10 +90,12 @@ static void nf_set_hooks_head(struct net *net, const struct nf_hook_ops *reg,
{
switch (reg->pf) {
case NFPROTO_NETDEV:
#ifdef CONFIG_NETFILTER_INGRESS
/* We already checked in nf_register_net_hook() that this is
* used from ingress.
*/
rcu_assign_pointer(reg->dev->nf_hooks_ingress, entry);
#endif
break;
default:
rcu_assign_pointer(net->nf.hooks[reg->pf][reg->hooknum],
@ -107,10 +109,15 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
struct nf_hook_entry *hooks_entry;
struct nf_hook_entry *entry;
if (reg->pf == NFPROTO_NETDEV &&
(reg->hooknum != NF_NETDEV_INGRESS ||
!reg->dev || dev_net(reg->dev) != net))
return -EINVAL;
if (reg->pf == NFPROTO_NETDEV) {
#ifndef CONFIG_NETFILTER_INGRESS
if (reg->hooknum == NF_NETDEV_INGRESS)
return -EOPNOTSUPP;
#endif
if (reg->hooknum != NF_NETDEV_INGRESS ||
!reg->dev || dev_net(reg->dev) != net)
return -EINVAL;
}
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
@ -160,7 +167,7 @@ void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg)
mutex_lock(&nf_hook_mutex);
hooks_entry = nf_hook_entry_head(net, reg);
if (hooks_entry->orig_ops == reg) {
if (hooks_entry && hooks_entry->orig_ops == reg) {
nf_set_hooks_head(net, reg,
nf_entry_dereference(hooks_entry->next));
goto unlock;

6
net/netfilter/nf_log.c
View File

@ -422,7 +422,7 @@ static int nf_log_proc_dostring(struct ctl_table *table, int write,
char buf[NFLOGGER_NAME_LEN];
int r = 0;
int tindex = (unsigned long)table->extra1;
struct net *net = current->nsproxy->net_ns;
struct net *net = table->extra2;
if (write) {
struct ctl_table tmp = *table;
@ -476,7 +476,6 @@ static int netfilter_log_sysctl_init(struct net *net)
3, "%d", i);
nf_log_sysctl_table[i].procname =
nf_log_sysctl_fnames[i];
nf_log_sysctl_table[i].data = NULL;
nf_log_sysctl_table[i].maxlen = NFLOGGER_NAME_LEN;
nf_log_sysctl_table[i].mode = 0644;
nf_log_sysctl_table[i].proc_handler =
@ -486,6 +485,9 @@ static int netfilter_log_sysctl_init(struct net *net)
}
}
for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
table[i].extra2 = net;
net->nf.nf_log_dir_header = register_net_sysctl(net,
"net/netfilter/nf_log",
table);

4
net/netfilter/nft_limit.c
View File

@ -145,7 +145,7 @@ static int nft_limit_pkts_init(const struct nft_ctx *ctx,
if (err < 0)
return err;
priv->cost = div_u64(priv->limit.nsecs, priv->limit.rate);
priv->cost = div64_u64(priv->limit.nsecs, priv->limit.rate);
return 0;
}
@ -170,7 +170,7 @@ static void nft_limit_pkt_bytes_eval(const struct nft_expr *expr,
const struct nft_pktinfo *pkt)
{
struct nft_limit *priv = nft_expr_priv(expr);
u64 cost = div_u64(priv->nsecs * pkt->skb->len, priv->rate);
u64 cost = div64_u64(priv->nsecs * pkt->skb->len, priv->rate);
if (nft_limit_eval(priv, cost))
regs->verdict.code = NFT_BREAK;

15
net/netfilter/xt_hashlimit.c
View File

@ -467,17 +467,18 @@ static u64 user2credits(u64 user, int revision)
/* If multiplying would overflow... */
if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY_v1))
/* Divide first. */
return (user / XT_HASHLIMIT_SCALE) *\
HZ * CREDITS_PER_JIFFY_v1;
return div64_u64(user, XT_HASHLIMIT_SCALE)
* HZ * CREDITS_PER_JIFFY_v1;
return (user * HZ * CREDITS_PER_JIFFY_v1) \
/ XT_HASHLIMIT_SCALE;
return div64_u64(user * HZ * CREDITS_PER_JIFFY_v1,
XT_HASHLIMIT_SCALE);
} else {
if (user > 0xFFFFFFFFFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
return (user / XT_HASHLIMIT_SCALE_v2) *\
HZ * CREDITS_PER_JIFFY;
return div64_u64(user, XT_HASHLIMIT_SCALE_v2)
* HZ * CREDITS_PER_JIFFY;
return (user * HZ * CREDITS_PER_JIFFY) / XT_HASHLIMIT_SCALE_v2;
return div64_u64(user * HZ * CREDITS_PER_JIFFY,
XT_HASHLIMIT_SCALE_v2);
}
}