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authorMathias Krause <minipli@googlemail.com>2013-04-07 01:51:48 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-07 16:28:00 -0400
commitef3313e84acbf349caecae942ab3ab731471f1a1 (patch)
tree9b2fd9a7ce55f7e08fd9d51a5e8525d6bbb9e4c6 /net/ax25/af_ax25.c
parent9b3e617f3df53822345a8573b6d358f6b9e5ed87 (diff)
downloadlinux-stericsson-ef3313e84acbf349caecae942ab3ab731471f1a1.tar.gz
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/af_ax25.c')
-rw-r--r--net/ax25/af_ax25.c1
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;