From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 723C6C433E7 for ; Tue, 20 Oct 2020 06:41:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BD522237B for ; Tue, 20 Oct 2020 06:41:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="UhARNXEK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404451AbgJTGl4 (ORCPT ); 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Tue, 20 Oct 2020 14:36:38 +0800 Received: from [172.21.77.33] (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 20 Oct 2020 14:36:39 +0800 Message-ID: <1603175799.19799.6.camel@mtkswgap22> Subject: Re: [PATCH v2] usb: gadget: configfs: Fix use-after-free issue with udc_name From: Macpaul Lin To: Felipe Balbi CC: Greg Kroah-Hartman , Matthias Brugger , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mediatek@lists.infradead.org" , wsd_upstream , Macpaul Lin , Eddie Hung =?UTF-8?Q?=28=E6=B4=AA=E6=AD=A3=E9=91=AB=29?= , "stable@vger.kernel.org" Date: Tue, 20 Oct 2020 14:36:39 +0800 In-Reply-To: <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> References: <1594881666-8843-1-git-send-email-macpaul.lin@mediatek.com> <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> Content-Type: text/plain; charset="ISO-8859-1" X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gU2F0LCAyMDIwLTA3LTE4IGF0IDEwOjQ1ICswODAwLCBNYWNwYXVsIExpbiB3cm90ZToNCj4g RnJvbTogRWRkaWUgSHVuZyA8ZWRkaWUuaHVuZ0BtZWRpYXRlay5jb20+DQo+IFRoZXJlIGlzIGEg dXNlLWFmdGVyLWZyZWUgaXNzdWUsIGlmIGFjY2VzcyB1ZGNfbmFtZQ0KPiBpbiBmdW5jdGlvbiBn YWRnZXRfZGV2X2Rlc2NfVURDX3N0b3JlIGFmdGVyIGFub3RoZXIgY29udGV4dA0KPiBmcmVlIHVk Y19uYW1lIGluIGZ1bmN0aW9uIHVucmVnaXN0ZXJfZ2FkZ2V0Lg0KPiANCj4gQ29udGV4dCAxOg0K PiBnYWRnZXRfZGV2X2Rlc2NfVURDX3N0b3JlKCktPnVucmVnaXN0ZXJfZ2FkZ2V0KCktPg0KPiBm cmVlIHVkY19uYW1lLT5zZXQgdWRjX25hbWUgdG8gTlVMTA0KPiANCj4gQ29udGV4dCAyOg0KPiBn YWRnZXRfZGV2X2Rlc2NfVURDX3Nob3coKS0+IGFjY2VzcyB1ZGNfbmFtZQ0KPiANCj4gQ2FsbCB0 cmFjZToNCj4gZHVtcF9iYWNrdHJhY2UrMHgwLzB4MzQwDQo+IHNob3dfc3RhY2srMHgxNC8weDFj DQo+IGR1bXBfc3RhY2srMHhlNC8weDEzNA0KPiBwcmludF9hZGRyZXNzX2Rlc2NyaXB0aW9uKzB4 NzgvMHg0NzgNCj4gX19rYXNhbl9yZXBvcnQrMHgyNzAvMHgyZWMNCj4ga2FzYW5fcmVwb3J0KzB4 MTAvMHgxOA0KPiBfX2FzYW5fcmVwb3J0X2xvYWQxX25vYWJvcnQrMHgxOC8weDIwDQo+IHN0cmlu ZysweGY0LzB4MTM4DQo+IHZzbnByaW50ZisweDQyOC8weDE0ZDANCj4gc3ByaW50ZisweGU0LzB4 MTJjDQo+IGdhZGdldF9kZXZfZGVzY19VRENfc2hvdysweDU0LzB4NjQNCj4gY29uZmlnZnNfcmVh ZF9maWxlKzB4MjEwLzB4M2EwDQo+IF9fdmZzX3JlYWQrMHhmMC8weDQ5Yw0KPiB2ZnNfcmVhZCsw eDEzMC8weDJiNA0KPiBTeVNfcmVhZCsweDExNC8weDIwOA0KPiBlbDBfc3ZjX25ha2VkKzB4MzQv MHgzOA0KPiANCj4gQWRkIG11dGV4X2xvY2sgdG8gcHJvdGVjdCB0aGlzIGtpbmQgb2Ygc2NlbmFy aW8uDQo+IA0KPiBTaWduZWQtb2ZmLWJ5OiBFZGRpZSBIdW5nIDxlZGRpZS5odW5nQG1lZGlhdGVr LmNvbT4NCj4gU2lnbmVkLW9mZi1ieTogTWFjcGF1bCBMaW4gPG1hY3BhdWwubGluQG1lZGlhdGVr LmNvbT4NCj4gUmV2aWV3ZWQtYnk6IFBldGVyIENoZW4gPHBldGVyLmNoZW5AbnhwLmNvbT4NCj4g Q2M6IHN0YWJsZUB2Z2VyLmtlcm5lbC5vcmcNCj4gLS0tDQo+IENoYW5nZXMgZm9yIHYyOg0KPiAg IC0gRml4IHR5cG8gJXMvY29udGV4L2NvbnRleHQsIFRoYW5rcyBQZXRlci4NCj4gDQo+ICBkcml2 ZXJzL3VzYi9nYWRnZXQvY29uZmlnZnMuYyB8IDExICsrKysrKysrKy0tDQo+ICAxIGZpbGUgY2hh bmdlZCwgOSBpbnNlcnRpb25zKCspLCAyIGRlbGV0aW9ucygtKQ0KPiANCj4gZGlmZiAtLWdpdCBh L2RyaXZlcnMvdXNiL2dhZGdldC9jb25maWdmcy5jIGIvZHJpdmVycy91c2IvZ2FkZ2V0L2NvbmZp Z2ZzLmMNCj4gaW5kZXggOWRjMDZhNGUxYjMwLi4yMTExMGIyODY1YjkgMTAwNjQ0DQo+IC0tLSBh L2RyaXZlcnMvdXNiL2dhZGdldC9jb25maWdmcy5jDQo+ICsrKyBiL2RyaXZlcnMvdXNiL2dhZGdl dC9jb25maWdmcy5jDQo+IEBAIC0yMjEsOSArMjIxLDE2IEBAIHN0YXRpYyBzc2l6ZV90IGdhZGdl dF9kZXZfZGVzY19iY2RVU0Jfc3RvcmUoc3RydWN0IGNvbmZpZ19pdGVtICppdGVtLA0KPiAgDQo+ ICBzdGF0aWMgc3NpemVfdCBnYWRnZXRfZGV2X2Rlc2NfVURDX3Nob3coc3RydWN0IGNvbmZpZ19p dGVtICppdGVtLCBjaGFyICpwYWdlKQ0KPiAgew0KPiAtCWNoYXIgKnVkY19uYW1lID0gdG9fZ2Fk Z2V0X2luZm8oaXRlbSktPmNvbXBvc2l0ZS5nYWRnZXRfZHJpdmVyLnVkY19uYW1lOw0KPiArCXN0 cnVjdCBnYWRnZXRfaW5mbyAqZ2kgPSB0b19nYWRnZXRfaW5mbyhpdGVtKTsNCj4gKwljaGFyICp1 ZGNfbmFtZTsNCj4gKwlpbnQgcmV0Ow0KPiArDQo+ICsJbXV0ZXhfbG9jaygmZ2ktPmxvY2spOw0K PiArCXVkY19uYW1lID0gZ2ktPmNvbXBvc2l0ZS5nYWRnZXRfZHJpdmVyLnVkY19uYW1lOw0KPiAr CXJldCA9IHNwcmludGYocGFnZSwgIiVzXG4iLCB1ZGNfbmFtZSA/OiAiIik7DQo+ICsJbXV0ZXhf dW5sb2NrKCZnaS0+bG9jayk7DQo+ICANCj4gLQlyZXR1cm4gc3ByaW50ZihwYWdlLCAiJXNcbiIs IHVkY19uYW1lID86ICIiKTsNCj4gKwlyZXR1cm4gcmV0Ow0KPiAgfQ0KPiAgDQo+ICBzdGF0aWMg aW50IHVucmVnaXN0ZXJfZ2FkZ2V0KHN0cnVjdCBnYWRnZXRfaW5mbyAqZ2kpDQoNCkp1c3Qgd2Fu dCB0byByZW1pbmQgd2UgaGF2ZSBhIGZpeCBoZXJlIGZvciB1c2IvZ2FkZ2V0L2NvbmZpZ2ZzLmMu DQpJZiB0aGUgcGF0Y2ggbmVlZCB0byBiZSBmdXJ0aGVyIHJldmlzZWQsIHBsZWFzZSBsZXQgdXMg a25vdy4NCg0KVGhhbmtzIQ0KTWFjcGF1bCBMaW4NCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E967EC433E7 for ; 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Tue, 20 Oct 2020 14:36:38 +0800 Received: from [172.21.77.33] (172.21.77.33) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 20 Oct 2020 14:36:39 +0800 Message-ID: <1603175799.19799.6.camel@mtkswgap22> Subject: Re: [PATCH v2] usb: gadget: configfs: Fix use-after-free issue with udc_name From: Macpaul Lin To: Felipe Balbi Date: Tue, 20 Oct 2020 14:36:39 +0800 In-Reply-To: <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> References: <1594881666-8843-1-git-send-email-macpaul.lin@mediatek.com> <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201020_023652_071431_33704C35 X-CRM114-Status: GOOD ( 20.49 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eddie Hung =?UTF-8?Q?=28=E6=B4=AA=E6=AD=A3=E9=91=AB=29?= , wsd_upstream , Greg Kroah-Hartman , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , Matthias Brugger , Macpaul Lin , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Sat, 2020-07-18 at 10:45 +0800, Macpaul Lin wrote: > From: Eddie Hung > There is a use-after-free issue, if access udc_name > in function gadget_dev_desc_UDC_store after another context > free udc_name in function unregister_gadget. > > Context 1: > gadget_dev_desc_UDC_store()->unregister_gadget()-> > free udc_name->set udc_name to NULL > > Context 2: > gadget_dev_desc_UDC_show()-> access udc_name > > Call trace: > dump_backtrace+0x0/0x340 > show_stack+0x14/0x1c > dump_stack+0xe4/0x134 > print_address_description+0x78/0x478 > __kasan_report+0x270/0x2ec > kasan_report+0x10/0x18 > __asan_report_load1_noabort+0x18/0x20 > string+0xf4/0x138 > vsnprintf+0x428/0x14d0 > sprintf+0xe4/0x12c > gadget_dev_desc_UDC_show+0x54/0x64 > configfs_read_file+0x210/0x3a0 > __vfs_read+0xf0/0x49c > vfs_read+0x130/0x2b4 > SyS_read+0x114/0x208 > el0_svc_naked+0x34/0x38 > > Add mutex_lock to protect this kind of scenario. > > Signed-off-by: Eddie Hung > Signed-off-by: Macpaul Lin > Reviewed-by: Peter Chen > Cc: stable@vger.kernel.org > --- > Changes for v2: > - Fix typo %s/contex/context, Thanks Peter. > > drivers/usb/gadget/configfs.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c > index 9dc06a4e1b30..21110b2865b9 100644 > --- a/drivers/usb/gadget/configfs.c > +++ b/drivers/usb/gadget/configfs.c > @@ -221,9 +221,16 @@ static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item, > > static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page) > { > - char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name; > + struct gadget_info *gi = to_gadget_info(item); > + char *udc_name; > + int ret; > + > + mutex_lock(&gi->lock); > + udc_name = gi->composite.gadget_driver.udc_name; > + ret = sprintf(page, "%s\n", udc_name ?: ""); > + mutex_unlock(&gi->lock); > > - return sprintf(page, "%s\n", udc_name ?: ""); > + return ret; > } > > static int unregister_gadget(struct gadget_info *gi) Just want to remind we have a fix here for usb/gadget/configfs.c. If the patch need to be further revised, please let us know. Thanks! Macpaul Lin _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D80EC433E7 for ; Tue, 20 Oct 2020 06:38:33 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2F27F2225F for ; 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Tue, 20 Oct 2020 14:36:39 +0800 Message-ID: <1603175799.19799.6.camel@mtkswgap22> Subject: Re: [PATCH v2] usb: gadget: configfs: Fix use-after-free issue with udc_name From: Macpaul Lin To: Felipe Balbi Date: Tue, 20 Oct 2020 14:36:39 +0800 In-Reply-To: <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> References: <1594881666-8843-1-git-send-email-macpaul.lin@mediatek.com> <1595040303-23046-1-git-send-email-macpaul.lin@mediatek.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201020_023652_071431_33704C35 X-CRM114-Status: GOOD ( 20.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eddie Hung =?UTF-8?Q?=28=E6=B4=AA=E6=AD=A3=E9=91=AB=29?= , wsd_upstream , Greg Kroah-Hartman , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , Matthias Brugger , Macpaul Lin , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 2020-07-18 at 10:45 +0800, Macpaul Lin wrote: > From: Eddie Hung > There is a use-after-free issue, if access udc_name > in function gadget_dev_desc_UDC_store after another context > free udc_name in function unregister_gadget. > > Context 1: > gadget_dev_desc_UDC_store()->unregister_gadget()-> > free udc_name->set udc_name to NULL > > Context 2: > gadget_dev_desc_UDC_show()-> access udc_name > > Call trace: > dump_backtrace+0x0/0x340 > show_stack+0x14/0x1c > dump_stack+0xe4/0x134 > print_address_description+0x78/0x478 > __kasan_report+0x270/0x2ec > kasan_report+0x10/0x18 > __asan_report_load1_noabort+0x18/0x20 > string+0xf4/0x138 > vsnprintf+0x428/0x14d0 > sprintf+0xe4/0x12c > gadget_dev_desc_UDC_show+0x54/0x64 > configfs_read_file+0x210/0x3a0 > __vfs_read+0xf0/0x49c > vfs_read+0x130/0x2b4 > SyS_read+0x114/0x208 > el0_svc_naked+0x34/0x38 > > Add mutex_lock to protect this kind of scenario. > > Signed-off-by: Eddie Hung > Signed-off-by: Macpaul Lin > Reviewed-by: Peter Chen > Cc: stable@vger.kernel.org > --- > Changes for v2: > - Fix typo %s/contex/context, Thanks Peter. > > drivers/usb/gadget/configfs.c | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c > index 9dc06a4e1b30..21110b2865b9 100644 > --- a/drivers/usb/gadget/configfs.c > +++ b/drivers/usb/gadget/configfs.c > @@ -221,9 +221,16 @@ static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item, > > static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page) > { > - char *udc_name = to_gadget_info(item)->composite.gadget_driver.udc_name; > + struct gadget_info *gi = to_gadget_info(item); > + char *udc_name; > + int ret; > + > + mutex_lock(&gi->lock); > + udc_name = gi->composite.gadget_driver.udc_name; > + ret = sprintf(page, "%s\n", udc_name ?: ""); > + mutex_unlock(&gi->lock); > > - return sprintf(page, "%s\n", udc_name ?: ""); > + return ret; > } > > static int unregister_gadget(struct gadget_info *gi) Just want to remind we have a fix here for usb/gadget/configfs.c. If the patch need to be further revised, please let us know. Thanks! Macpaul Lin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel