linux-kernel - [PATCH v2 0/4] irqdomain: Fix mapping-creation race

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 for Android: free password hash cracker in your pocket

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

Date:   Thu,  1 Sep 2022 16:28:12 +0200
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v2 0/4] irqdomain: Fix mapping-creation race

Parallel probing (e.g. due to asynchronous probing) of devices that
share interrupts can currently result in two mappings for the same
hardware interrupt to be created.

This series adds a serialising mapping mutex so that looking for an
existing mapping before creating a new one is done atomically.

Included are also some related clean ups that remove a redundant lookup
for existing mappings and make the domain-association locking more fine
grained.

Johan

Changes in v2
 - split out redundant lookup cleanup (1/4)
 - use a per-domain mutex to address mapping race (2/4)
 - move kernel-doc to exported function (2/4)
 - fix association race (3/4, new)
 - use per-domain mutex for associations (4/4, new)

Johan Hovold (4):
  irqdomain: Look for existing mapping only once
  irqdomain: Fix mapping-creation race
  irqdomain: Fix domain-association race
  irqdomain: use per-domain mutex for associations

 include/linux/irqdomain.h |   2 +
 kernel/irq/irqdomain.c    | 104 ++++++++++++++++++++++++--------------
 2 files changed, 69 insertions(+), 37 deletions(-)

-- 
2.35.1