Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 08/36] virtio_blk: Fix an SG_IO regression | Date | Mon, 6 Nov 2017 10:12:21 +0100 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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From: Bart Van Assche <bart.vanassche@wdc.com>
commit efea2abcb03215f2efadfe994ff7f652aaff196b upstream.
Avoid that submitting an SG_IO ioctl triggers a kernel oops that is preceded by:
usercopy: kernel memory overwrite attempt detected to (null) (<null>) (6 bytes) kernel BUG at mm/usercopy.c:72!
Reported-by: Dann Frazier <dann.frazier@canonical.com> Fixes: commit ca18d6f769d2 ("block: Make most scsi_req_init() calls implicit") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Dann Frazier <dann.frazier@canonical.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Moved virtblk_initialize_rq() inside CONFIG_VIRTIO_BLK_SCSI.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
--- drivers/block/virtio_blk.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -593,10 +593,22 @@ static int virtblk_map_queues(struct blk return blk_mq_virtio_map_queues(set, vblk->vdev, 0); } +#ifdef CONFIG_VIRTIO_BLK_SCSI +static void virtblk_initialize_rq(struct request *req) +{ + struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + + scsi_req_init(&vbr->sreq); +} +#endif + static const struct blk_mq_ops virtio_mq_ops = { .queue_rq = virtio_queue_rq, .complete = virtblk_request_done, .init_request = virtblk_init_request, +#ifdef CONFIG_VIRTIO_BLK_SCSI + .initialize_rq_fn = virtblk_initialize_rq, +#endif .map_queues = virtblk_map_queues, };
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