diff options
| author | Vasiliy Kulikov <segooon@gmail.com> | 2010-11-10 12:09:10 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 16:53:46 -0700 |
| commit | 975c07cc89c47f28bb83f2c7cc32a273c75add8a (patch) | |
| tree | dfc5572a97ce1530e1f3f026ef15e47004345a66 | |
| parent | 1fe4497092df6c3a1f32bdd539ebd9747a289e85 (diff) | |
net: packet: fix information leak to userland
commit 67286640f638f5ad41a946b9a3dc75327950248f upstream.
packet_getname_spkt() doesn't initialize all members of sa_data field of
sockaddr struct if strlen(dev->name) < 13. This structure is then copied
to userland. It leads to leaking of contents of kernel stack memory.
We have to fully fill sa_data with strncpy() instead of strlcpy().
The same with packet_getname(): it doesn't initialize sll_pkttype field of
sockaddr_ll. Set it to zero.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Moritz Muehlenhoff <jmm@debian.org>
[jmm: Backported to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | net/packet/af_packet.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 41866eb2b5b6..9d9b78e97b71 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1526,7 +1526,7 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, uaddr->sa_family = AF_PACKET; dev = dev_get_by_index(sock_net(sk), pkt_sk(sk)->ifindex); if (dev) { - strlcpy(uaddr->sa_data, dev->name, 15); + strncpy(uaddr->sa_data, dev->name, 14); dev_put(dev); } else memset(uaddr->sa_data, 0, 14); @@ -1549,6 +1549,7 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr, sll->sll_family = AF_PACKET; sll->sll_ifindex = po->ifindex; sll->sll_protocol = po->num; + sll->sll_pkttype = 0; dev = dev_get_by_index(sock_net(sk), po->ifindex); if (dev) { sll->sll_hatype = dev->type; |