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| author | Mathias Krause <minipli@googlemail.com> | 2014-11-19 18:05:26 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-11-27 11:14:06 +0100 |
| commit | 416b05bc9db9b9cd48418391538478a438e762b3 (patch) | |
| tree | 26e78b95cd5330924a919109d776dce76197c16d | |
| parent | 6d986f090a2f895a0d3a3f42122402aa3d3427b7 (diff) | |
| download | lwn-416b05bc9db9b9cd48418391538478a438e762b3.tar.gz lwn-416b05bc9db9b9cd48418391538478a438e762b3.zip | |
pptp: fix stack info leak in pptp_getname()
[ Upstream commit a5f6fc28d6e6cc379c6839f21820e62262419584 ]
pptp_getname() only partially initializes the stack variable sa,
particularly only fills the pptp part of the sa_addr union. The code
thereby discloses 16 bytes of kernel stack memory via getsockname().
Fix this by memset(0)'ing the union before.
Cc: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/net/ppp/pptp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c index 1aff970be33e..1dc628ffce2b 100644 --- a/drivers/net/ppp/pptp.c +++ b/drivers/net/ppp/pptp.c @@ -506,7 +506,9 @@ static int pptp_getname(struct socket *sock, struct sockaddr *uaddr, int len = sizeof(struct sockaddr_pppox); struct sockaddr_pppox sp; - sp.sa_family = AF_PPPOX; + memset(&sp.sa_addr, 0, sizeof(sp.sa_addr)); + + sp.sa_family = AF_PPPOX; sp.sa_protocol = PX_PROTO_PPTP; sp.sa_addr.pptp = pppox_sk(sock->sk)->proto.pptp.src_addr; |