Comment 1 for bug 711045

Andy Whitcroft (apw) wrote :

This was fixed by the commit below, this is already upstream and released in v2.6.37, therefore closing off for Natty:

  commit 67286640f638f5ad41a946b9a3dc75327950248f
  Author: Vasiliy Kulikov <email address hidden>
  Date: Wed Nov 10 12:09:10 2010 -0800

    net: packet: fix information leak to userland

    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 address hidden>
    Signed-off-by: David S. Miller <email address hidden>