radio-iris: declare in a header, define in a source file

Change-Id: Ibf5b1d9f97c214e8bfcbe1339f645ea23e9d481e
radio: iris: transport: move radio_hci_smd_init to __init section

Change-Id: I37aba71dc5fdee00054172ed46a20d93c3e77766
radio: iris: fix smd init when iris-transport is not compiled as module

Change-Id: Id0d9a36f93ec387e08be3d041e60113d2cf75aa8
m8: defconfig: enable Qualcomm IRIS Transport

Change-Id: If227a6644019fa0c61b6179d9e5be3787de2f4e9
n_tty: Fix n_tty_write crash when echoing in raw mode

The tty atomic_write_lock does not provide an exclusion guarantee for
the tty driver if the termios settings are LECHO & !OPOST.  And since
it is unexpected and not allowed to call TTY buffer helpers like
tty_insert_flip_string concurrently, this may lead to crashes when
concurrect writers call pty_write. In that case the following two
writers:
* the ECHOing from a workqueue and
* pty_write from the process
race and can overflow the corresponding TTY buffer like follows.

If we look into tty_insert_flip_string_fixed_flag, there is:
  int space = __tty_buffer_request_room(port, goal, flags);
  struct tty_buffer *tb = port->buf.tail;
  ...
  memcpy(char_buf_ptr(tb, tb->used), chars, space);
  ...
  tb->used += space;

so the race of the two can result in something like this:
              A                                B
__tty_buffer_request_room
                                  __tty_buffer_request_room
memcpy(buf(tb->used), ...)
tb->used += space;
                                  memcpy(buf(tb->used), ...) ->BOOM

B's memcpy is past the tty_buffer due to the previous A's tb->used
increment.

Since the N_TTY line discipline input processing can output
concurrently with a tty write, obtain the N_TTY ldisc output_lock to
serialize echo output with normal tty writes.  This ensures the tty
buffer helper tty_insert_flip_string is not called concurrently and
everything is fine.

Note that this is nicely reproducible by an ordinary user using
forkpty and some setup around that (raw termios + ECHO). And it is
present in kernels at least after commit
d945cb9cce20ac7143c2de8d88b187f62db99bdc (pty: Rework the pty layer to
use the normal buffering logic) in 2.6.31-rc3.

js: add more info to the commit log
js: switch to bool
js: lock unconditionally
js: lock only the tty->ops->write call

Change-Id: Ie0b03989fa8cfd6ffe40d1f770044fe7447dda05
References: CVE-2014-0196
Reported-and-tested-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.4: output_lock is a member of struct tty_struct]
Merge changes If227a664,Id0d9a36f,I37aba71d,Ibf5b1d9f into cm-11.0

* changes:
  m8: defconfig: enable Qualcomm IRIS Transport
  radio: iris: fix smd init when iris-transport is not compiled as module
  radio: iris: transport: move radio_hci_smd_init to __init section
  radio-iris: declare in a header, define in a source file
Merge "n_tty: Fix n_tty_write crash when echoing in raw mode" into cm-11.0
Merge branch 'cm-11.0' into kk_mkt