linux-kernel - [PATCH 0/2] fixes for the updating nr_hw

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]

Date:   Wed, 15 Aug 2018 15:25:13 +0800
From:   Jianchao Wang <jianchao.w.wang@...cle.com>
To:     axboe@...nel.dk
Cc:     tom.leiming@...il.com, bart.vanassche@....com,
        keith.busch@...ux.intel.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] fixes for the updating nr_hw_queues

Two fixes for updating nr_hw_queues.

The first patch fixes the following scenario:
Kyber depends on the mapping between cpu and nr_hw_queues. When
update nr_hw_queues, elevator_type->ops.mq.init_hctx will be
invoked before the mapping is adapted correctly, this would cause
panic in kyber.

The second patch fixes the following scenario:
part_in_flight/rw will invoke blk_mq_in_flight/rw to account the
inflight requests. It will access the queue_hw_ctx and nr_hw_queues
w/o any protection. When updating nr_hw_queues and blk_mq_in_flight
/rw occur concurrently, panic comes up.

Jianchao Wang (2)
blk-mq: init hctx sched after update cpu & nr_hw_queues
blk-mq: sync the update nr_hw_queues with part_in_flight

 block/blk-mq.c         | 40 ++++++++++++++++++++++++++++++++--------
 block/blk.h            |  2 ++
 block/elevator.c       | 20 ++++++++++++--------
 block/genhd.c          | 10 ++++++++--
 include/linux/blkdev.h |  4 ++++
 5 files changed, 58 insertions(+), 18 deletions(-)

Thanks
Jianchao