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| author | Mathias Krause <minipli@googlemail.com> | 2014-11-19 18:05:26 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-21 04:43:47 +0100 |
| commit | a5f6fc28d6e6cc379c6839f21820e62262419584 (patch) | |
| tree | f251bb2b01c2465cd791c4db2d5ef2dfe9ef83b6 | |
| parent | cxgb4i : Don't block unload/cxgb4 unload when remote closes TCP connection (diff) | |
| download | linux-a5f6fc28d6e6cc379c6839f21820e62262419584.tar.xz linux-a5f6fc28d6e6cc379c6839f21820e62262419584.zip | |
pptp: fix stack info leak in pptp_getname()
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>
| -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; |