target/linux/generic/patches-3.3/090-CVE-2013-1763.patch

   1 From 6e601a53566d84e1ffd25e7b6fe0b6894ffd79c0 Mon Sep 17 00:00:00 2001
   2 From: Mathias Krause <minipli@googlemail.com>
   3 Date: Sat, 23 Feb 2013 01:13:47 +0000
   4 Subject: sock_diag: Fix out-of-bounds access to sock_diag_handlers[]
   5
   6 Userland can send a netlink message requesting SOCK_DIAG_BY_FAMILY
   7 with a family greater or equal then AF_MAX -- the array size of
   8 sock_diag_handlers[]. The current code does not test for this
   9 condition therefore is vulnerable to an out-of-bound access opening
  10 doors for a privilege escalation.
  11
  12 Signed-off-by: Mathias Krause <minipli@googlemail.com>
  13 Acked-by: Eric Dumazet <edumazet@google.com>
  14 Signed-off-by: David S. Miller <davem@davemloft.net>
  15 ---
  16 --- a/net/core/sock_diag.c
  17 +++ b/net/core/sock_diag.c
  18 @@ -126,6 +126,9 @@ static int __sock_diag_rcv_msg(struct sk
  19         if (nlmsg_len(nlh) < sizeof(*req))
  20                 return -EINVAL;
  21
  22 +       if (req->sdiag_family >= AF_MAX)
  23 +               return -EINVAL;
  24 +
  25         hndl = sock_diag_lock_handler(req->sdiag_family);
  26         if (hndl == NULL)
  27                 err = -ENOENT;