Patchwork [02/16] ax25: fix info leak via msg_name in ax25_recvmsg()

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Submitter Mathias Krause
Date April 7, 2013, 11:51 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/234481/
State Accepted
Delegated to: David Miller
Headers show


Mathias Krause - April 7, 2013, 11:51 a.m.
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 <>
Signed-off-by: Mathias Krause <>
 net/ax25/af_ax25.c |    1 +
 1 file changed, 1 insertion(+)


diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 7b11f8b..e277e38 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;