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Date: Tue, 22 Sep 2015 12:24:13 +0000 From: "Kaukab, Yousaf" <yousaf.kaukab@...el.com> To: John Youn <John.Youn@...opsys.com>, Yunzhi Li <lyz@...k-chips.com>, Felipe Balbi <balbi@...com> CC: "heiko@...ech.de" <heiko@...ech.de>, "cf@...k-chips.com" <cf@...k-chips.com>, "hl@...k-chips.com" <hl@...k-chips.com>, "yk@...k-chips.com" <yk@...k-chips.com>, "gauravsh@...gle.com" <gauravsh@...gle.com>, "alberto@...gle.com" <alberto@...gle.com>, "wulf@...k-chips.com" <wulf@...k-chips.com>, "jwerner@...omium.org" <jwerner@...omium.org>, "jeffy.chen@...k-chips.com" <jeffy.chen@...k-chips.com>, "Herrero, Gregory" <gregory.herrero@...el.com>, "huangtao@...k-chips.com" <huangtao@...k-chips.com>, "rockchip-discuss@...omium.org" <rockchip-discuss@...omium.org>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: [PATCH v1] usb: dwc2: gadget: fix a memory use-after-free bug > -----Original Message----- > From: John Youn [mailto:John.Youn@...opsys.com] > Sent: Thursday, June 11, 2015 4:16 AM > To: Yunzhi Li; John.Youn@...opsys.com > Cc: heiko@...ech.de; 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; Herrero, Gregory; > Kaukab, Yousaf; huangtao@...k-chips.com; rockchip-discuss@...omium.org; > Greg Kroah-Hartman; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org > Subject: Re: [PATCH v1] usb: dwc2: gadget: fix a memory use-after-free bug > > On 5/28/2015 10:22 PM, Yunzhi Li wrote: > > 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> > > > > --- > > > > drivers/usb/dwc2/gadget.c | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c > > index 6a30887..8070602 100644 > > --- a/drivers/usb/dwc2/gadget.c > > +++ b/drivers/usb/dwc2/gadget.c > > @@ -1389,14 +1389,14 @@ static void s3c_hsotg_complete_request(struct > dwc2_hsotg *hsotg, > > if (hs_req->req.status == -EINPROGRESS) > > hs_req->req.status = result; > > > > + if (using_dma(hsotg)) > > + s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req); > > + > > s3c_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, > hs_req); > > > > hs_ep->req = NULL; > > list_del_init(&hs_req->queue); > > > > - if (using_dma(hsotg)) > > - s3c_hsotg_unmap_dma(hsotg, hs_ep, hs_req); > > - > > /* > > * call the complete request with the locks off, just in case the > > * request tries to queue more work for this endpoint. > > > > > Acked-by: John Youn <johnyoun@...opsys.com> > Hi Felipe, This patch is still missing in testing/next. Can you just take this one or would you like it to be send again? > > John BR, Yousaf -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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