linux-kernel - Re: [PATCH] RDMA/irdma: Fix UAF in irdma_sc_ccq_get_cqe

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Date:   Sun, 19 Nov 2023 15:13:02 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Shifeng Li <lishifeng1992@....com>
Cc:     mustafa.ismail@...el.com, shiraz.saleem@...el.com, jgg@...pe.ca,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        dinghui@...gfor.com.cn
Subject: Re: [PATCH] RDMA/irdma: Fix UAF in irdma_sc_ccq_get_cqe_info()

On Thu, Nov 16, 2023 at 10:50:43PM -0800, Shifeng Li wrote:
> When removing the irdma driver or unplugging its aux device, the ccq
> queue is released before destorying the cqp_cmpl_wq queue.
> But in the window, there may still be completion events for wqes. That
> will cause a UAF in irdma_sc_ccq_get_cqe_info().
> 
> [34693.333191] BUG: KASAN: use-after-free in irdma_sc_ccq_get_cqe_info+0x82f/0x8c0 [irdma]
> [34693.333194] Read of size 8 at addr ffff889097f80818 by task kworker/u67:1/26327
> [34693.333194]
> [34693.333199] CPU: 9 PID: 26327 Comm: kworker/u67:1 Kdump: loaded Tainted: G           O     --------- -t - 4.18.0 #1
> [34693.333200] Hardware name: SANGFOR Inspur/NULL, BIOS 4.1.13 08/01/2016
> [34693.333211] Workqueue: cqp_cmpl_wq cqp_compl_worker [irdma]
> [34693.333213] Call Trace:
> [34693.333220]  dump_stack+0x71/0xab
> [34693.333226]  print_address_description+0x6b/0x290
> [34693.333238]  ? irdma_sc_ccq_get_cqe_info+0x82f/0x8c0 [irdma]
> [34693.333240]  kasan_report+0x14a/0x2b0
> [34693.333251]  irdma_sc_ccq_get_cqe_info+0x82f/0x8c0 [irdma]
> [34693.333264]  ? irdma_free_cqp_request+0x151/0x1e0 [irdma]
> [34693.333274]  irdma_cqp_ce_handler+0x1fb/0x3b0 [irdma]
> [34693.333285]  ? irdma_ctrl_init_hw+0x2c20/0x2c20 [irdma]
> [34693.333290]  ? __schedule+0x836/0x1570
> [34693.333293]  ? strscpy+0x83/0x180
> [34693.333296]  process_one_work+0x56a/0x11f0
> [34693.333298]  worker_thread+0x8f/0xf40
> [34693.333301]  ? __kthread_parkme+0x78/0xf0
> [34693.333303]  ? rescuer_thread+0xc50/0xc50
> [34693.333305]  kthread+0x2a0/0x390
> [34693.333308]  ? kthread_destroy_worker+0x90/0x90
> [34693.333310]  ret_from_fork+0x1f/0x40
> 
> Signed-off-by: Shifeng Li <lishifeng1992@....com>
> ---
>  drivers/infiniband/hw/irdma/hw.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Please add Fixes line and resubmit together with Shiraz's Acked-by,

Thanks