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| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:57 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-07 16:28:02 -0400 |
| commit | 3ce5efad47b62c57a4f5c54248347085a750ce0e (patch) | |
| tree | 6ea783a53cab3815f147b9ade4bda5b3ad09b177 /net/netrom | |
| parent | c77a4b9cffb6215a15196ec499490d116dfad181 (diff) | |
| download | linux-stable-3ce5efad47b62c57a4f5c54248347085a750ce0e.tar.gz linux-stable-3ce5efad47b62c57a4f5c54248347085a750ce0e.tar.bz2 linux-stable-3ce5efad47b62c57a4f5c54248347085a750ce0e.zip | |
netrom: fix info leak via msg_name in nr_recvmsg()
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).
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
| -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 d1fa1d9ffd2e..7fcb307dea47 100644 --- a/net/netrom/af_netrom.c +++ b/net/netrom/af_netrom.c @@ -1173,6 +1173,7 @@ 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); |