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[209.132.180.67]) by mx.google.com with ESMTP id i78si91036oib.1.2020.01.07.07.36.15; Tue, 07 Jan 2020 07:36:29 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728255AbgAGPfL (ORCPT + 99 others); Tue, 7 Jan 2020 10:35:11 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:54545 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727559AbgAGPfK (ORCPT ); Tue, 7 Jan 2020 10:35:10 -0500 Received: from rabammel.molgen.mpg.de (rabammel.molgen.mpg.de [141.14.30.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id C0A702000C0A1; Tue, 7 Jan 2020 16:35:05 +0100 (CET) Subject: Re: BUG: KASAN: use-after-free in xhci_trb_virt_to_dma.part.24+0x1c/0x80 To: Mathias Nyman , Mika Westerberg Cc: Greg KH , Mathias Nyman , linux-usb@vger.kernel.org, LKML References: <95b4bdb2-962f-561e-ac14-79cd44395915@molgen.mpg.de> <20180720095410.GA11904@kroah.com> <107dbdd1-4e45-836f-7f8f-85bc63374e4f@molgen.mpg.de> <30b069b5-63f6-dd9e-b323-668f06bff6cf@molgen.mpg.de> <20200103110451.GJ465886@lahna.fi.intel.com> <81c6f906-3f5a-729d-f3b4-1ac6ac607c05@linux.intel.com> From: Paul Menzel Message-ID: <84369435-d355-0462-98ab-91bb1c5d3871@molgen.mpg.de> Date: Tue, 7 Jan 2020 16:35:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <81c6f906-3f5a-729d-f3b4-1ac6ac607c05@linux.intel.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms070508000006060207030306" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms070508000006060207030306 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Mathias, dear Mika, On 2020-01-07 13:09, Mathias Nyman wrote: > On 3.1.2020 13.04, Mika Westerberg wrote: >> On Thu, Jan 02, 2020 at 03:10:14PM +0100, Paul Menzel wrote: >>> Mika, as you fixed the other leak, any idea, how to continue from the= >>> kmemleak log below? >>> >>> ``` >>> unreferenced object 0xffff8c207a1e1408 (size 8): >>> =C2=A0=C2=A0 comm "systemd-udevd", pid 183, jiffies 4294667978 (age 7= 52.292s) >>> =C2=A0=C2=A0 hex dump (first 8 bytes): >>> =C2=A0=C2=A0=C2=A0=C2=A0 34 01 05 00 00 00 00 00=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4....... >>> =C2=A0=C2=A0 backtrace: >>> =C2=A0=C2=A0=C2=A0=C2=A0 [<00000000aea7b46d>] xhci_mem_init+0xcfa/0xe= c0 [xhci_hcd] >> >> There are probably better ways for doing this but you can use objdump >> for example: >> >> =C2=A0=C2=A0 $ objdump -l --prefix-addresses -j .text --disassemble=3D= xhci_mem_init drivers/usb/host/xhci-hcd.ko >> >> then find the offset xhci_mem_init+0xcfa. It should show you the line >> numbers as well if you have compiled your kernel with debug info. This= >> should be close to the line that allocated the memory that was leaked.= Thank you. I actually remembered `script/f2addr2line`. $ scripts/faddr2line drivers/usb/host/xhci-hcd.o xhci_mem_init+0xcfa xhci_mem_init+0xcfa/0xec0: xhci_add_in_port at /mnt/drivers/usb/host/xhci-mem.c:2161 (inlined by) xhci_setup_port_arrays at /mnt/drivers/usb/host/xhci-mem= =2Ec:2309 (inlined by) xhci_mem_init at /mnt/drivers/usb/host/xhci-mem.c:2538 > Paul, it possible that your xhci controller has several > supported protocol extended capabilities for usb 3 ports, each > with their own custom protocol speed ID table. >=20 > xhci driver assumes there is only one custome PSI table per roothub, > and we will end up allocating the second PSI table on top of the first,= > leaking the first. >=20 > Could you boot with xhci dynamic debug enabled, and show dmesg after bo= ot, add: > xhci_hcd.dyndbg=3D+p > to you kernel cmdline. >=20 > Or as an alternative, show output of: >=20 > sudo cat /sys/kernel/debug/usb/xhci/*/reg-ext-protocol* `/sys/kernel/debug/` cannot be read by unprivileged users, so the wildcar= d does not work with `sudo`. ``` $ sudo ls /sys/kernel/debug/usb/xhci 0000:12:00.0 0000:26:00.3 0000:26:00.4 # cat /sys/kernel/debug/usb/xhci/*/reg-ext-protocol* EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x00000201 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_REVISION =3D 0x03000802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x00000203 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_REVISION =3D 0x02000802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x00190a05 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_REVISION =3D 0x02000402 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x00180401 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x10000105 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_MANTISSA1 =3D 0x00050134 EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x10000106 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_MANTISSA1 =3D 0x00050134 EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x10000107 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_MANTISSA1 =3D 0x00050134 EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x10000108 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_MANTISSA1 =3D 0x00050134 EXTCAP_REVISION =3D 0x02000402 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x00180101 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_REVISION =3D 0x03100802 EXTCAP_NAME =3D 0x20425355 EXTCAP_PORTINFO =3D 0x10000102 EXTCAP_PORTTYPE =3D 0x00000000 EXTCAP_MANTISSA1 =3D 0x00050134 ``` Kind regards, Paul --------------ms070508000006060207030306 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT 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