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Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c145
1 files changed, 126 insertions, 19 deletions
diff --git a/net/socket.c b/net/socket.c
index ac2219f90d5..5212447c86e 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -240,17 +240,19 @@ static struct kmem_cache *sock_inode_cachep __read_mostly;
static struct inode *sock_alloc_inode(struct super_block *sb)
{
struct socket_alloc *ei;
+ struct socket_wq *wq;
ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
- ei->socket.wq = kmalloc(sizeof(struct socket_wq), GFP_KERNEL);
- if (!ei->socket.wq) {
+ wq = kmalloc(sizeof(*wq), GFP_KERNEL);
+ if (!wq) {
kmem_cache_free(sock_inode_cachep, ei);
return NULL;
}
- init_waitqueue_head(&ei->socket.wq->wait);
- ei->socket.wq->fasync_list = NULL;
+ init_waitqueue_head(&wq->wait);
+ wq->fasync_list = NULL;
+ RCU_INIT_POINTER(ei->socket.wq, wq);
ei->socket.state = SS_UNCONNECTED;
ei->socket.flags = 0;
@@ -273,9 +275,11 @@ static void wq_free_rcu(struct rcu_head *head)
static void sock_destroy_inode(struct inode *inode)
{
struct socket_alloc *ei;
+ struct socket_wq *wq;
ei = container_of(inode, struct socket_alloc, vfs_inode);
- call_rcu(&ei->socket.wq->rcu, wq_free_rcu);
+ wq = rcu_dereference_protected(ei->socket.wq, 1);
+ call_rcu(&wq->rcu, wq_free_rcu);
kmem_cache_free(sock_inode_cachep, ei);
}
@@ -524,7 +528,7 @@ void sock_release(struct socket *sock)
module_put(owner);
}
- if (sock->wq->fasync_list)
+ if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
printk(KERN_ERR "sock_release: fasync list not empty!\n");
percpu_sub(sockets_in_use, 1);
@@ -1108,15 +1112,16 @@ static int sock_fasync(int fd, struct file *filp, int on)
{
struct socket *sock = filp->private_data;
struct sock *sk = sock->sk;
+ struct socket_wq *wq;
if (sk == NULL)
return -EINVAL;
lock_sock(sk);
+ wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk));
+ fasync_helper(fd, filp, on, &wq->fasync_list);
- fasync_helper(fd, filp, on, &sock->wq->fasync_list);
-
- if (!sock->wq->fasync_list)
+ if (!wq->fasync_list)
sock_reset_flag(sk, SOCK_FASYNC);
else
sock_set_flag(sk, SOCK_FASYNC);
@@ -2583,23 +2588,123 @@ static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32)
static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32)
{
+ struct compat_ethtool_rxnfc __user *compat_rxnfc;
+ bool convert_in = false, convert_out = false;
+ size_t buf_size = ALIGN(sizeof(struct ifreq), 8);
+ struct ethtool_rxnfc __user *rxnfc;
struct ifreq __user *ifr;
+ u32 rule_cnt = 0, actual_rule_cnt;
+ u32 ethcmd;
u32 data;
- void __user *datap;
+ int ret;
- ifr = compat_alloc_user_space(sizeof(*ifr));
+ if (get_user(data, &ifr32->ifr_ifru.ifru_data))
+ return -EFAULT;
- if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
+ compat_rxnfc = compat_ptr(data);
+
+ if (get_user(ethcmd, &compat_rxnfc->cmd))
return -EFAULT;
- if (get_user(data, &ifr32->ifr_ifru.ifru_data))
+ /* Most ethtool structures are defined without padding.
+ * Unfortunately struct ethtool_rxnfc is an exception.
+ */
+ switch (ethcmd) {
+ default:
+ break;
+ case ETHTOOL_GRXCLSRLALL:
+ /* Buffer size is variable */
+ if (get_user(rule_cnt, &compat_rxnfc->rule_cnt))
+ return -EFAULT;
+ if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32))
+ return -ENOMEM;
+ buf_size += rule_cnt * sizeof(u32);
+ /* fall through */
+ case ETHTOOL_GRXRINGS:
+ case ETHTOOL_GRXCLSRLCNT:
+ case ETHTOOL_GRXCLSRULE:
+ convert_out = true;
+ /* fall through */
+ case ETHTOOL_SRXCLSRLDEL:
+ case ETHTOOL_SRXCLSRLINS:
+ buf_size += sizeof(struct ethtool_rxnfc);
+ convert_in = true;
+ break;
+ }
+
+ ifr = compat_alloc_user_space(buf_size);
+ rxnfc = (void *)ifr + ALIGN(sizeof(struct ifreq), 8);
+
+ if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ))
return -EFAULT;
- datap = compat_ptr(data);
- if (put_user(datap, &ifr->ifr_ifru.ifru_data))
+ if (put_user(convert_in ? rxnfc : compat_ptr(data),
+ &ifr->ifr_ifru.ifru_data))
return -EFAULT;
- return dev_ioctl(net, SIOCETHTOOL, ifr);
+ if (convert_in) {
+ /* We expect there to be holes between fs.m_u and
+ * fs.ring_cookie and at the end of fs, but nowhere else.
+ */
+ BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_u) +
+ sizeof(compat_rxnfc->fs.m_u) !=
+ offsetof(struct ethtool_rxnfc, fs.m_u) +
+ sizeof(rxnfc->fs.m_u));
+ BUILD_BUG_ON(
+ offsetof(struct compat_ethtool_rxnfc, fs.location) -
+ offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) !=
+ offsetof(struct ethtool_rxnfc, fs.location) -
+ offsetof(struct ethtool_rxnfc, fs.ring_cookie));
+
+ if (copy_in_user(rxnfc, compat_rxnfc,
+ (void *)(&rxnfc->fs.m_u + 1) -
+ (void *)rxnfc) ||
+ copy_in_user(&rxnfc->fs.ring_cookie,
+ &compat_rxnfc->fs.ring_cookie,
+ (void *)(&rxnfc->fs.location + 1) -
+ (void *)&rxnfc->fs.ring_cookie) ||
+ copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt,
+ sizeof(rxnfc->rule_cnt)))
+ return -EFAULT;
+ }
+
+ ret = dev_ioctl(net, SIOCETHTOOL, ifr);
+ if (ret)
+ return ret;
+
+ if (convert_out) {
+ if (copy_in_user(compat_rxnfc, rxnfc,
+ (const void *)(&rxnfc->fs.m_u + 1) -
+ (const void *)rxnfc) ||
+ copy_in_user(&compat_rxnfc->fs.ring_cookie,
+ &rxnfc->fs.ring_cookie,
+ (const void *)(&rxnfc->fs.location + 1) -
+ (const void *)&rxnfc->fs.ring_cookie) ||
+ copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt,
+ sizeof(rxnfc->rule_cnt)))
+ return -EFAULT;
+
+ if (ethcmd == ETHTOOL_GRXCLSRLALL) {
+ /* As an optimisation, we only copy the actual
+ * number of rules that the underlying
+ * function returned. Since Mallory might
+ * change the rule count in user memory, we
+ * check that it is less than the rule count
+ * originally given (as the user buffer size),
+ * which has been range-checked.
+ */
+ if (get_user(actual_rule_cnt, &rxnfc->rule_cnt))
+ return -EFAULT;
+ if (actual_rule_cnt < rule_cnt)
+ rule_cnt = actual_rule_cnt;
+ if (copy_in_user(&compat_rxnfc->rule_locs[0],
+ &rxnfc->rule_locs[0],
+ rule_cnt * sizeof(u32)))
+ return -EFAULT;
+ }
+ }
+
+ return 0;
}
static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32)
@@ -2643,7 +2748,8 @@ static int bond_ioctl(struct net *net, unsigned int cmd,
old_fs = get_fs();
set_fs(KERNEL_DS);
- err = dev_ioctl(net, cmd, &kifr);
+ err = dev_ioctl(net, cmd,
+ (struct ifreq __user __force *) &kifr);
set_fs(old_fs);
return err;
@@ -2752,7 +2858,7 @@ static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
old_fs = get_fs();
set_fs(KERNEL_DS);
- err = dev_ioctl(net, cmd, (void __user *)&ifr);
+ err = dev_ioctl(net, cmd, (void __user __force *)&ifr);
set_fs(old_fs);
if (cmd == SIOCGIFMAP && !err) {
@@ -2857,7 +2963,8 @@ static int routing_ioctl(struct net *net, struct socket *sock,
ret |= __get_user(rtdev, &(ur4->rt_dev));
if (rtdev) {
ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
- r4.rt_dev = devname; devname[15] = 0;
+ r4.rt_dev = (char __user __force *)devname;
+ devname[15] = 0;
} else
r4.rt_dev = NULL;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-27 17:21:41 +0000