diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-04-07 01:52:00 +0000 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2013-06-10 11:43:46 +0200 |
| commit | 0736a7172906aa0356f1ce47363c429c60214fec (patch) | |
| tree | 1ee24237125dbf0a650a9e277d9ced04e018a9c6 /net | |
| parent | 21f908c9c285c0e9a1148aef6243caf6930bc158 (diff) | |
tipc: fix info leaks via msg_name in recv_msg/recv_stream
commit 60085c3d009b0df252547adb336d1ccca5ce52ec upstream.
The code in set_orig_addr() does not initialize all of the members of
struct sockaddr_tipc when filling the sockaddr info -- namely the union
is only partly filled. This will make recv_msg() and recv_stream() --
the only users of this function -- leak kernel stack memory as the
msg_name member is a local variable in net/socket.c.
Additionally to that both recv_msg() and recv_stream() fail to update
the msg_namelen member to 0 while otherwise returning with 0, i.e.
"success". This is the case for, e.g., non-blocking sockets. This will
lead to a 128 byte kernel stack leak in net/socket.c.
Fix the first issue by initializing the memory of the union with
memset(0). Fix the second one by setting msg_namelen to 0 early as it
will be updated later if we're going to fill the msg_name member.
Cc: Jon Maloy <jon.maloy@ericsson.com>
Cc: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[dannf: backported to Debian's 2.6.32]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'net')
| -rw-r--r-- | net/tipc/socket.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 8ebf4975a0fb..eccb86b9c370 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -800,6 +800,7 @@ static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) if (addr) { addr->family = AF_TIPC; addr->addrtype = TIPC_ADDR_ID; + memset(&addr->addr, 0, sizeof(addr->addr)); addr->addr.id.ref = msg_origport(msg); addr->addr.id.node = msg_orignode(msg); addr->addr.name.domain = 0; /* could leave uninitialized */ @@ -916,6 +917,9 @@ static int recv_msg(struct kiocb *iocb, struct socket *sock, goto exit; } + /* will be updated in set_orig_addr() if needed */ + m->msg_namelen = 0; + restart: /* Look for a message in receive queue; wait if necessary */ @@ -1049,6 +1053,9 @@ static int recv_stream(struct kiocb *iocb, struct socket *sock, goto exit; } + /* will be updated in set_orig_addr() if needed */ + m->msg_namelen = 0; + restart: /* Look for a message in receive queue; wait if necessary */ |