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authorGao feng <gaofeng@cn.fujitsu.com>2012-07-11 21:50:15 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-16 23:00:43 -0700
commitef209f15980360f6945873df3cd710c5f62f2a3e (patch)
tree2d299dba72b6b346229ee50e25e83d9bca8b3d6b /net
parent936597631dd310e220544dc5c6075d924efd39b2 (diff)
net: cgroup: fix access the unallocated memory in netprio cgroup
there are some out of bound accesses in netprio cgroup. now before accessing the dev->priomap.priomap array,we only check if the dev->priomap exist.and because we don't want to see additional bound checkings in fast path, so we should make sure that dev->priomap is null or array size of dev->priomap.priomap is equal to max_prioidx + 1; so in write_priomap logic,we should call extend_netdev_table when dev->priomap is null and dev->priomap.priomap_len < max_len. and in cgrp_create->update_netdev_tables logic,we should call extend_netdev_table only when dev->priomap exist and dev->priomap.priomap_len < max_len. and it's not needed to call update_netdev_tables in write_priomap, we can only allocate the net device's priomap which we change through net_prio.ifpriomap. this patch also add a return value for update_netdev_tables & extend_netdev_table, so when new_priomap is allocated failed, write_priomap will stop to access the priomap,and return -ENOMEM back to the userspace to tell the user what happend. Change From v3: 1. add rtnl protect when reading max_prioidx in write_priomap. 2. only call extend_netdev_table when map->priomap_len < max_len, this will make sure array size of dev->map->priomap always bigger than any prioidx. 3. add a function write_update_netdev_table to make codes clear. Change From v2: 1. protect extend_netdev_table by RTNL. 2. when extend_netdev_table failed,call dev_put to reduce device's refcount. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Eric Dumazet <edumazet@google.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/netprio_cgroup.c71
1 files changed, 54 insertions, 17 deletions
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 3e953eaddbfc..b2e9caa1ad1a 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -65,7 +65,7 @@ static void put_prioidx(u32 idx)
spin_unlock_irqrestore(&prioidx_map_lock, flags);
}
-static void extend_netdev_table(struct net_device *dev, u32 new_len)
+static int extend_netdev_table(struct net_device *dev, u32 new_len)
{
size_t new_size = sizeof(struct netprio_map) +
((sizeof(u32) * new_len));
@@ -77,7 +77,7 @@ static void extend_netdev_table(struct net_device *dev, u32 new_len)
if (!new_priomap) {
pr_warn("Unable to alloc new priomap!\n");
- return;
+ return -ENOMEM;
}
for (i = 0;
@@ -90,46 +90,79 @@ static void extend_netdev_table(struct net_device *dev, u32 new_len)
rcu_assign_pointer(dev->priomap, new_priomap);
if (old_priomap)
kfree_rcu(old_priomap, rcu);
+ return 0;
}
-static void update_netdev_tables(void)
+static int write_update_netdev_table(struct net_device *dev)
{
+ int ret = 0;
+ u32 max_len;
+ struct netprio_map *map;
+
+ rtnl_lock();
+ max_len = atomic_read(&max_prioidx) + 1;
+ map = rtnl_dereference(dev->priomap);
+ if (!map || map->priomap_len < max_len)
+ ret = extend_netdev_table(dev, max_len);
+ rtnl_unlock();
+
+ return ret;
+}
+
+static int update_netdev_tables(void)
+{
+ int ret = 0;
struct net_device *dev;
- u32 max_len = atomic_read(&max_prioidx) + 1;
+ u32 max_len;
struct netprio_map *map;
rtnl_lock();
+ max_len = atomic_read(&max_prioidx) + 1;
for_each_netdev(&init_net, dev) {
map = rtnl_dereference(dev->priomap);
- if ((!map) ||
- (map->priomap_len < max_len))
- extend_netdev_table(dev, max_len);
+ /*
+ * don't allocate priomap if we didn't
+ * change net_prio.ifpriomap (map == NULL),
+ * this will speed up skb_update_prio.
+ */
+ if (map && map->priomap_len < max_len) {
+ ret = extend_netdev_table(dev, max_len);
+ if (ret < 0)
+ break;
+ }
}
rtnl_unlock();
+ return ret;
}
static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs;
- int ret;
+ int ret = -EINVAL;
cs = kzalloc(sizeof(*cs), GFP_KERNEL);
if (!cs)
return ERR_PTR(-ENOMEM);
- if (cgrp->parent && cgrp_netprio_state(cgrp->parent)->prioidx) {
- kfree(cs);
- return ERR_PTR(-EINVAL);
- }
+ if (cgrp->parent && cgrp_netprio_state(cgrp->parent)->prioidx)
+ goto out;
ret = get_prioidx(&cs->prioidx);
- if (ret != 0) {
+ if (ret < 0) {
pr_warn("No space in priority index array\n");
- kfree(cs);
- return ERR_PTR(ret);
+ goto out;
+ }
+
+ ret = update_netdev_tables();
+ if (ret < 0) {
+ put_prioidx(cs->prioidx);
+ goto out;
}
return &cs->css;
+out:
+ kfree(cs);
+ return ERR_PTR(ret);
}
static void cgrp_destroy(struct cgroup *cgrp)
@@ -221,13 +254,17 @@ static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
if (!dev)
goto out_free_devname;
- update_netdev_tables();
- ret = 0;
+ ret = write_update_netdev_table(dev);
+ if (ret < 0)
+ goto out_put_dev;
+
rcu_read_lock();
map = rcu_dereference(dev->priomap);
if (map)
map->priomap[prioidx] = priority;
rcu_read_unlock();
+
+out_put_dev:
dev_put(dev);
out_free_devname: