Re: [PATCH] nbd: fix uaf in nbd_open

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在 2023/11/3 16:12, Christoph Hellwig 写道:
On Fri, Nov 03, 2023 at 06:13:34PM +0800, Li Lingfeng wrote:
From: Li Lingfeng <lilingfeng3@xxxxxxxxxx>

Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and
blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set
disk->private_data as NULL as before. UAF may be triggered in nbd_open()
if someone tries to open nbd device right after nbd_put() since refcount
of nbd device is zero and private_data is not NULL.
I don't think this is the right fix.  nbd needs to move to ->free_disk
to free it's private data.
Thanks for your advice, I will send v2 soon.




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