diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:51:48 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-07 16:28:00 -0400 |
| commit | ef3313e84acbf349caecae942ab3ab731471f1a1 (patch) | |
| tree | 9b2fd9a7ce55f7e08fd9d51a5e8525d6bbb9e4c6 /net/ax25 | |
| parent | 9b3e617f3df53822345a8573b6d358f6b9e5ed87 (diff) | |
| download | lwn-ef3313e84acbf349caecae942ab3ab731471f1a1.tar.gz lwn-ef3313e84acbf349caecae942ab3ab731471f1a1.zip | |
ax25: fix info leak via msg_name in ax25_recvmsg()
When msg_namelen is non-zero 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. Additionally the
msg_namelen value is updated to sizeof(struct full_sockaddr_ax25) but is
not always filled up to this size.
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/ax25')
| -rw-r--r-- | net/ax25/af_ax25.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index 7b11f8bc5071..e277e38f736b 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1642,6 +1642,7 @@ static int ax25_recvmsg(struct kiocb *iocb, struct socket *sock, ax25_address src; const unsigned char *mac = skb_mac_header(skb); + memset(sax, 0, sizeof(struct full_sockaddr_ax25)); ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, &digi, NULL, NULL); sax->sax25_family = AF_AX25; |