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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf

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Pablo Neira Ayuso says:

====================
The following patchset contains three netfilter fixes for your net
tree, they are:

* A couple of fixes to resolve info leak to userspace due to uninitialized
  memory area in ulogd, from Mathias Krause.

* Fix instruction ordering issues that may lead to the access of
  uninitialized data in x_tables. The problem involves the table update
 (producer) and the main packet matching (consumer) routines. Detected in
  SMP ARMv7, from Will Deacon.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2013-10-23 16:55:04 -04:00
commit afb14c7cb6
6 changed files with 25 additions and 13 deletions
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9
net/bridge/netfilter/ebt_ulog.c
View File

@ -181,6 +181,7 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
ub->qlen++;
pm = nlmsg_data(nlh);
memset(pm, 0, sizeof(*pm));
/* Fill in the ulog data */
pm->version = EBT_ULOG_VERSION;
@ -193,8 +194,6 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
pm->hook = hooknr;
if (uloginfo->prefix != NULL)
strcpy(pm->prefix, uloginfo->prefix);
else
*(pm->prefix) = '\0';
if (in) {
strcpy(pm->physindev, in->name);
@ -204,16 +203,14 @@ static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
strcpy(pm->indev, br_port_get_rcu(in)->br->dev->name);
else
strcpy(pm->indev, in->name);
} else
pm->indev[0] = pm->physindev[0] = '\0';
}
if (out) {
/* If out exists, then out is a bridge port */
strcpy(pm->physoutdev, out->name);
/* rcu_read_lock()ed by nf_hook_slow */
strcpy(pm->outdev, br_port_get_rcu(out)->br->dev->name);
} else
pm->outdev[0] = pm->physoutdev[0] = '\0';
}
if (skb_copy_bits(skb, -ETH_HLEN, pm->data, copy_len) < 0)
BUG();

5
net/ipv4/netfilter/arp_tables.c
View File

@ -271,6 +271,11 @@ unsigned int arpt_do_table(struct sk_buff *skb,
local_bh_disable();
addend = xt_write_recseq_begin();
private = table->private;
/*
* Ensure we load private-> members after we've fetched the base
* pointer.
*/
smp_read_barrier_depends();
table_base = private->entries[smp_processor_id()];
e = get_entry(table_base, private->hook_entry[hook]);

5
net/ipv4/netfilter/ip_tables.c
View File

@ -327,6 +327,11 @@ ipt_do_table(struct sk_buff *skb,
addend = xt_write_recseq_begin();
private = table->private;
cpu = smp_processor_id();
/*
* Ensure we load private-> members after we've fetched the base
* pointer.
*/
smp_read_barrier_depends();
table_base = private->entries[cpu];
jumpstack = (struct ipt_entry **)private->jumpstack[cpu];
stackptr = per_cpu_ptr(private->stackptr, cpu);

7
net/ipv4/netfilter/ipt_ULOG.c
View File

@ -220,6 +220,7 @@ static void ipt_ulog_packet(struct net *net,
ub->qlen++;
pm = nlmsg_data(nlh);
memset(pm, 0, sizeof(*pm));
/* We might not have a timestamp, get one */
if (skb->tstamp.tv64 == 0)
@ -238,8 +239,6 @@ static void ipt_ulog_packet(struct net *net,
}
else if (loginfo->prefix[0] != '\0')
strncpy(pm->prefix, loginfo->prefix, sizeof(pm->prefix));
else
*(pm->prefix) = '\0';
if (in && in->hard_header_len > 0 &&
skb->mac_header != skb->network_header &&
@ -251,13 +250,9 @@ static void ipt_ulog_packet(struct net *net,
if (in)
strncpy(pm->indev_name, in->name, sizeof(pm->indev_name));
else
pm->indev_name[0] = '\0';
if (out)
strncpy(pm->outdev_name, out->name, sizeof(pm->outdev_name));
else
pm->outdev_name[0] = '\0';
/* copy_len <= skb->len, so can't fail. */
if (skb_copy_bits(skb, 0, pm->payload, copy_len) < 0)

5
net/ipv6/netfilter/ip6_tables.c
View File

@ -349,6 +349,11 @@ ip6t_do_table(struct sk_buff *skb,
local_bh_disable();
addend = xt_write_recseq_begin();
private = table->private;
/*
* Ensure we load private-> members after we've fetched the base
* pointer.
*/
smp_read_barrier_depends();
cpu = smp_processor_id();
table_base = private->entries[cpu];
jumpstack = (struct ip6t_entry **)private->jumpstack[cpu];

7
net/netfilter/x_tables.c
View File

@ -845,8 +845,13 @@ xt_replace_table(struct xt_table *table,
return NULL;
}
table->private = newinfo;
newinfo->initial_entries = private->initial_entries;
/*
* Ensure contents of newinfo are visible before assigning to
* private.
*/
smp_wmb();
table->private = newinfo;
/*
* Even though table entries have now been swapped, other CPU's