From: Hannes Reinecke <hare@suse.de>
To: Bart Van Assche <bart.vanassche@sandisk.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-scsi@vger.kernel.org, linux-block@vger.kernel.org,
Jens Axboe <axboe@fb.com>, Christoph Hellwig <hch@lst.de>,
Tejun Heo <tj@kernel.org>, Jan Kara <jack@suse.cz>,
Hannes Reinecke <hare@suse.com>,
stable@vger.kernel.org
Subject: Re: [PATCH 09/31] block: Avoid that blk_exit_rl() triggers a use-after-free
Date: Wed, 24 May 2017 07:55:52 +0200 [thread overview]
Message-ID: <de6847ba-e58a-7fe5-a2d2-58b00daf5a46@suse.de> (raw)
In-Reply-To: <20170524003420.5381-10-bart.vanassche@sandisk.com>
On 05/24/2017 02:33 AM, Bart Van Assche wrote:
> Since the introduction of the .init_rq_fn() and .exit_rq_fn() it
> is essential that the memory allocated for struct request_queue
> stays around until all blk_exit_rl() calls have finished. Hence
> make blk_init_rl() take a reference on struct request_queue.
>
> This patch fixes the following crash:
>
> general protection fault: 0000 [#2] SMP
> CPU: 3 PID: 28 Comm: ksoftirqd/3 Tainted: G D 4.12.0-rc2-dbg+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
> task: ffff88013a108040 task.stack: ffffc9000071c000
> RIP: 0010:free_request_size+0x1a/0x30
> RSP: 0018:ffffc9000071fd38 EFLAGS: 00010202
> RAX: 6b6b6b6b6b6b6b6b RBX: ffff880067362a88 RCX: 0000000000000003
> RDX: ffff880067464178 RSI: ffff880067362a88 RDI: ffff880135ea4418
> RBP: ffffc9000071fd40 R08: 0000000000000000 R09: 0000000100180009
> R10: ffffc9000071fd38 R11: ffffffff81110800 R12: ffff88006752d3d8
> R13: ffff88006752d3d8 R14: ffff88013a108040 R15: 000000000000000a
> FS: 0000000000000000(0000) GS:ffff88013fd80000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fa8ec1edb00 CR3: 0000000138ee8000 CR4: 00000000001406e0
> Call Trace:
> mempool_destroy.part.10+0x21/0x40
> mempool_destroy+0xe/0x10
> blk_exit_rl+0x12/0x20
> blkg_free+0x4d/0xa0
> __blkg_release_rcu+0x59/0x170
> rcu_process_callbacks+0x260/0x4e0
> __do_softirq+0x116/0x250
> smpboot_thread_fn+0x123/0x1e0
> kthread+0x109/0x140
> ret_from_fork+0x31/0x40
>
> Fixes: commit e9c787e65c0c ("scsi: allocate scsi_cmnd structures as part of struct request")
> Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
> Cc: Jens Axboe <axboe@fb.com>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Hannes Reinecke <hare@suse.com>
> Cc: <stable@vger.kernel.org> # v4.11+
> ---
> block/blk-cgroup.c | 2 +-
> block/blk-core.c | 10 ++++++++--
> block/blk-sysfs.c | 2 +-
> block/blk.h | 2 +-
> 4 files changed, 11 insertions(+), 5 deletions(-)
>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
next prev parent reply other threads:[~2017-05-24 5:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170524003420.5381-1-bart.vanassche@sandisk.com>
2017-05-24 0:33 ` [PATCH 09/31] block: Avoid that blk_exit_rl() triggers a use-after-free Bart Van Assche
2017-05-24 5:55 ` Hannes Reinecke [this message]
2017-05-24 15:09 ` Tejun Heo
2017-05-24 0:33 ` [PATCH 10/31] Avoid that scsi_exit_rq() " Bart Van Assche
2017-05-24 5:58 ` Hannes Reinecke
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