net: fix info leak in compat dev_ifconf()
authorMathias Krause <minipli@googlemail.com>
Wed, 15 Aug 2012 11:31:57 +0000 (11:31 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 16 Aug 2012 04:36:31 +0000 (21:36 -0700)
commit43da5f2e0d0c69ded3d51907d9552310a6b545e8
treea4858b0f6b300c06e12986b7c29e7a4d9ece76d9
parent2d8a041b7bfe1097af21441cb77d6af95f4f4680
net: fix info leak in compat dev_ifconf()

The implementation of dev_ifconf() for the compat ioctl interface uses
an intermediate ifc structure allocated in userland for the duration of
the syscall. Though, it fails to initialize the padding bytes inserted
for alignment and that for leaks four bytes of kernel stack. Add an
explicit memset(0) before filling the structure to avoid the info leak.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/socket.c