linux.git/sound/core/seq/seq_clientmgr.h, branch v5.8

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Reviewed-by: Richard Fontana 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman

ALSA: seq: Protect racy pool manipulation from OSS sequencer

2019-04-12T11:07:25+00:00

OSS sequencer emulation still allows to queue and issue the events
that manipulate the client pool concurrently in a racy way.  This
patch serializes the access like the normal sequencer write / ioctl
via taking the client ioctl_mutex.  Since the access to the sequencer
client is done indirectly via a client id number, a new helper to
take/release the mutex is introduced.

Signed-off-by: Takashi Iwai

ALSA: seq: Simplify snd_seq_kernel_client_enqueue() helper

2019-04-12T10:51:22+00:00

We have two helpers for queuing a sequencer event from the kernel
client, and both are used only from OSS sequencer layer without any
hop and atomic set.  Let's simplify and unify two helpers into one.

No functional change, just a call pattern change.

Signed-off-by: Takashi Iwai

ALSA: seq: Make ioctls race-free

2018-01-11T13:37:51+00:00

The ALSA sequencer ioctls have no protection against racy calls while
the concurrent operations may lead to interfere with each other.  As
reported recently, for example, the concurrent calls of setting client
pool with a combination of write calls may lead to either the
unkillable dead-lock or UAF.

As a slightly big hammer solution, this patch introduces the mutex to
make each ioctl exclusive.  Although this may reduce performance via
parallel ioctl calls, usually it's not demanded for sequencer usages,
hence it should be negligible.

Reported-by: Luo Quan 
Reviewed-by: Kees Cook 
Reviewed-by: Greg Kroah-Hartman 
Cc: 
Signed-off-by: Takashi Iwai

ALSA: seq: Provide card number / PID via sequencer client info

2016-03-08T09:52:52+00:00

rawmidi devices expose the card number via IOCTLs, which allows to
find the corresponding device in sysfs.

The sequencer provides no identifing data. Chromium works around this
issue by scanning rawmidi as well as sequencer devices and matching
them by using assumtions, how the kernel register sequencer devices.

This changes adds support for exposing the card number for kernel clients
as well as the PID for user client.

The minor of the API version is changed to distinguish between the zero
initialised reserved field and card number 0.

[minor coding style fixes by tiwai]

Signed-off-by: Martin Koegler 
Acked-by: Clemens Ladisch 
Signed-off-by: Takashi Iwai

[ALSA] sound/core/seq: move declarations of globally visible variables to proper headers

2008-01-31T16:29:35+00:00

sound/core/seq: move declarations of globally visible variables to proper headers

Signed-off-by: Marcin Ślusarz 
Signed-off-by: Takashi Iwai 
Signed-off-by: Jaroslav Kysela

[ALSA] semaphore -> mutex (core part)

2006-03-22T09:24:50+00:00

Semaphore to mutex conversion.

The conversion was generated via scripts, and the result was validated
automatically via a script as well.

Signed-off-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Takashi Iwai

[ALSA] seq: remove struct snd_seq_client_callback

2006-01-03T11:30:47+00:00

The fields of struct snd_seq_client_callback either aren't used or are
always set to the same value, so we can get rid of it altogether.

Signed-off-by: Clemens Ladisch

[ALSA] seq: remove superfluous fields

2006-01-03T11:30:45+00:00

Modules: ALSA sequencer

None of the fields of struct snd_seq_kernel_client was actually used, so
remove them.

Signed-off-by: Clemens Ladisch

[ALSA] Remove xxx_t typedefs: Sequencer

2006-01-03T11:17:52+00:00

Modules: ALSA sequencer

Remove xxx_t typedefs from the core sequencer codes.

Signed-off-by: Takashi Iwai