linux-kernel - [PATCH 0/2] firewire: obsolete cast of function callback toward CFI

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Date:   Wed, 20 May 2020 15:47:24 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     oscar.carter@....com, keescook@...omium.org, mchehab@...nel.org,
        clemens@...isch.de, tiwai@...e.de, perex@...ex.cz
Cc:     kernel-hardening@...ts.openwall.com,
        linux1394-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        levonshe@...il.com, alsa-devel@...a-project.org,
        stefanr@...6.in-berlin.de
Subject: [PATCH 0/2] firewire: obsolete cast of function callback toward CFI

Hi,

Oscar Carter works for Control Flow Integrity build. Any cast
of function callback is inconvenient for the work. Unfortunately,
current code of firewire-core driver includes the cast[1] and Oscar
posted some patches to remove it[2]. The patch is itself good. However,
it includes changes existent kernel API and all of drivers as user
of the API get affects from the change.

This patchset is an alternative idea to add a new kernel API specific
for multichannel isoc context. The existent kernel API and drivers is
left as is.

Practically, no in-kernel drivers use the additional API. Although the
API is exported in the patchset, it's better to discuss about unexporting
the API.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/firewire/core-cdev.c#n985
[2] https://lore.kernel.org/lkml/20200519173425.4724-1-oscar.carter@gmx.com/

Regards

Takashi Sakamoto (2):
  firewire-core: add kernel API to construct multichannel isoc context
  firewire-core: obsolete cast of function callback

 drivers/firewire/core-cdev.c | 44 +++++++++++++++++++-----------------
 drivers/firewire/core-iso.c  | 17 ++++++++++++++
 include/linux/firewire.h     |  3 +++
 3 files changed, 43 insertions(+), 21 deletions(-)

-- 
2.25.1