linux-kernel - [char-misc-next v2 0/5] mei: fix mei

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250630091942.2116676-1-alexander.usyskin@intel.com>
Date: Mon, 30 Jun 2025 12:19:37 +0300
From: Alexander Usyskin <alexander.usyskin@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Reuven Abliyev <reuven.abliyev@...el.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [char-misc-next v2 0/5] mei: fix mei_device lifetime

mei_device data structure is allocated using devm_* functions
and hooked to the parent device.
It works for client systems where parent device is pci one.
When parent device is auxiliary bus device produced by
graphics driver, the parent can be destroyed before child
and on the way it cleans all allocated memory.
This leads to use-after-free if mei character device is
opened when parent device is destroyed.
Introduce device to hook the mei_device lifetime on it and
decouple cdev from main structure to allow all memory
to be released when it is unused and not before.

Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14201

V2: Make cdev patches first to avoid double refcounting
    in the middle of the series.
    Replace manual refcount with special device.

Alexander Usyskin (5):
  mei: set parent for char device
  mei: make char device control its own lifetime
  mei: bus: use cldev in prints
  mei: more prints with client prefix
  mei: create dedicated device object

 drivers/misc/mei/bus-fixup.c    |  16 ++--
 drivers/misc/mei/bus.c          |  42 +++++-----
 drivers/misc/mei/client.c       |  82 +++++++++----------
 drivers/misc/mei/client.h       |   6 +-
 drivers/misc/mei/dma-ring.c     |   8 +-
 drivers/misc/mei/gsc-me.c       |  13 +--
 drivers/misc/mei/hbm.c          | 135 +++++++++++++++-----------------
 drivers/misc/mei/hw-me.c        | 101 ++++++++++++------------
 drivers/misc/mei/hw-txe.c       |  62 +++++++--------
 drivers/misc/mei/init.c         |  85 ++++++++++++++------
 drivers/misc/mei/interrupt.c    |  47 ++++++-----
 drivers/misc/mei/main.c         |  99 ++++++++++++-----------
 drivers/misc/mei/mei_dev.h      |  15 ++--
 drivers/misc/mei/pci-me.c       |  12 ++-
 drivers/misc/mei/pci-txe.c      |  10 ++-
 drivers/misc/mei/platform-vsc.c |  18 +++--
 16 files changed, 404 insertions(+), 347 deletions(-)

-- 
2.43.0