2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Vasiliy Kulikov <[email protected]>

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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Cc: Moritz Muehlenhoff <[email protected]>
[jmm: Backported to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 net/packet/af_packet.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1526,7 +1526,7 @@ static int packet_getname_spkt(struct so
        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
        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;


_______________________________________________
stable mailing list
[email protected]
http://linux.kernel.org/mailman/listinfo/stable

Reply via email to