diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-01 09:41:05 -0700 |
| commit | cd5e3d9ff117b6cff7a82b076be20dc91eec3f4f (patch) | |
| tree | 2a86cd6125faf1ae2d4436bbca4163e8af24940a /net | |
| parent | 40aea043862dd46aa865587223e084da2e3e37cf (diff) | |
netrom: fix info leak via msg_name in nr_recvmsg()
[ Upstream commits 3ce5efad47b62c57a4f5c54248347085a750ce0e and
c802d759623acbd6e1ee9fbdabae89159a513913 ]
In case msg_name is set the sockaddr info gets filled out, as
requested, but the code fails to initialize the padding bytes of
struct sockaddr_ax25 inserted by the compiler for alignment. Also
the sax25_ndigis member does not get assigned, leaking four more
bytes.
Both issues lead to the fact that the code will leak uninitialized
kernel stack bytes in net/socket.c.
Fix both issues by initializing the memory with memset(0).
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netrom/af_netrom.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c index 1b9024ee963c..72cad6cbcbce 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -1177,6 +1177,7 @@ static int nr_recvmsg(struct kiocb *iocb, struct socket *sock, } if (sax != NULL) { + memset(sax, 0, sizeof(sax)); sax->sax25_family = AF_NETROM; skb_copy_from_linear_data_offset(skb, 7, sax->sax25_call.ax25_call, AX25_ADDR_LEN); |