linux-kernel - Re: [PATCH v1] usb: dwc2: gadget: fix a memory use-after-free bug

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Date:	Thu, 11 Jun 2015 13:45:54 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Yunzhi Li <lyz@...k-chips.com>
Cc:	johnyoun@...opsys.com, cf@...k-chips.com, hl@...k-chips.com,
	yk@...k-chips.com, gauravsh@...gle.com, alberto@...gle.com,
	wulf@...k-chips.com, jwerner@...omium.org,
	jeffy.chen@...k-chips.com, gregory.herrero@...el.com,
	yousaf.kaukab@...el.com, huangtao@...k-chips.com,
	rockchip-discuss@...omium.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] usb: dwc2: gadget: fix a memory use-after-free bug

Am Freitag, 29. Mai 2015, 13:22:26 schrieb Yunzhi Li:
> When s3c_hsotg_handle_unaligned_buf_complete() hs_req->req.buf
> already destroyed, in s3c_hsotg_unmap_dma(), it touches
> hs_req->req.dma again, so s3c_hsotg_unmap_dma() should be called
> before s3c_hsotg_handle_unaligned_buf_complete(). Otherwise, it
> will cause a bad_page BUG, when allocate this memory page next
> time.
> 
> This bug led to the following crash:
> 
> BUG: Bad page state in process swapper/0  pfn:2bdbc
> [   26.820440] page:eed76780 count:0 mapcount:0 mapping:  (null) index:0x0
> [   26.854710] page flags: 0x200(arch_1)
> [   26.885836] page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set
> [   26.919179] bad because of flags:
> [   26.948917] page flags: 0x200(arch_1)
> [   26.979100] Modules linked in:
> [   27.008401] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W3.14.0 #17
> [   27.041816] [<c010e1f8>] (unwind_backtrace) from [<c010a704>]
> (show_stack+0x20/0x24) [   27.076108] [<c010a704>] (show_stack) from
> [<c087eea8>] (dump_stack+0x70/0x8c) [   27.110246] [<c087eea8>]
> (dump_stack) from [<c01ce0b8>] (bad_page+0xfc/0x12c) [   27.143958]
> [<c01ce0b8>] (bad_page) from [<c01ce65c>]
> (get_page_from_freelist+0x3e4/0x50c) [   27.179298] [<c01ce65c>]
> (get_page_from_freelist) from [<c01ce9a0>] (__alloc_pages_nodemask) [  
> 27.216296] [<c01ce9a0>] (__alloc_pages_nodemask) from [<c01cf00c>]
> (__get_free_pages+0x20/) [   27.252326] [<c01cf00c>] (__get_free_pages)
> from [<c01e5bec>] (kmalloc_order_trace+0x34/0xa) [   27.288295]
> [<c01e5bec>] (kmalloc_order_trace) from [<c0203304>] (__kmalloc+0x40/0x1ac)
> [   27.323751] [<c0203304>] (__kmalloc) from [<c052abc0>]
> (s3c_hsotg_ep_queue.isra.12+0x7c/0x1) [   27.359937] [<c052abc0>]
> (s3c_hsotg_ep_queue.isra.12) from [<c052af88>] (s3c_hsotg_ep_queue) [  
> 27.397478] [<c052af88>] (s3c_hsotg_ep_queue_lock) from [<c0554110>]
> (rx_submit+0xfc/0x164) [   27.433619] [<c0554110>] (rx_submit) from
> [<c05546e8>] (rx_complete+0x22c/0x230) [   27.468872] [<c05546e8>]
> (rx_complete) from [<c052b528>] (s3c_hsotg_complete_request+0xfc/0) [  
> 27.506240] [<c052b528>] (s3c_hsotg_complete_request) from [<c052bba0>]
> (s3c_hsotg_handle_o) [   27.545401] [<c052bba0>] (s3c_hsotg_handle_outdone)
> from [<c052be70>] (s3c_hsotg_epint+0x2c) [   27.583689] [<c052be70>]
> (s3c_hsotg_epint) from [<c052c750>] (s3c_hsotg_irq+0x1dc/0x4ac) [  
> 27.621041] [<c052c750>] (s3c_hsotg_irq) from [<c01682e0>]
> (handle_irq_event_percpu+0x70/0x) [   27.659066] [<c01682e0>]
> (handle_irq_event_percpu) from [<c01684ec>] (handle_irq_event+0x4c) [  
> 27.697322] [<c01684ec>] (handle_irq_event) from [<c016bae0>]
> (handle_fasteoi_irq+0xc8/0x11) [   27.735451] [<c016bae0>]
> (handle_fasteoi_irq) from [<c0167b8c>] (generic_handle_irq+0x30/0x) [  
> 27.773918] [<c0167b8c>] (generic_handle_irq) from [<c0167ca4>]
> (__handle_domain_irq+0x84/0) [   27.812018] [<c0167ca4>]
> (__handle_domain_irq) from [<c01003b0>] (gic_handle_irq+0x48/0x6c) [  
> 27.849695] [<c01003b0>] (gic_handle_irq) from [<c010b340>]
> (__irq_svc+0x40/0x50) [   27.886907] Exception stack(0xc0d01ee0 to
> 0xc0d01f28)
> 
> Signed-off-by: Yunzhi Li <lyz@...k-chips.com>

on a rk3288
Tested-by: Heiko Stuebner <heiko@...ech.de>

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