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Fri, 31 Jul 2020 06:58:01 +0000 Subject: Re: [Linux-kernel-mentees] [PATCH] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl() To: Greg Kroah-Hartman , Luben Tuikov Cc: Alex Deucher , Xiaojie Yuan , Thomas Zimmermann , Arnd Bergmann , David Airlie , Felix Kuehling , LKML , amd-gfx list , Nicholas Kazlauskas , =?UTF-8?B?TWFyZWsgT2zFocOhaw==?= , Hans de Goede , Trek , Maling list - DRI developers , Daniel Vetter , Alex Deucher , Evan Quan , Leo Liu , Peilin Ye , Dan Carpenter , linux-kernel-mentees@lists.linuxfoundation.org References: <20200728192924.441570-1-yepeilin.cs@gmail.com> <30b2a31f-77c2-56c1-ecde-875c6eea99d5@gmail.com> <8c5cf518-12d2-7495-7822-c7ebf8e61972@amd.com> <20200731065322.GA1518178@kroah.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <690213fd-d3d2-2253-dcb2-367a65b34f38@amd.com> Date: Fri, 31 Jul 2020 08:57:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200731065322.GA1518178@kroah.com> Content-Type: text/plain; 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X-Microsoft-Antispam-Message-Info: 9/R+ORIk3Lh7K50Msjj8z7g1kDpZfBdn7jT7ufslLalIPfSOeprtQsjYWTacVkoAI2KMPyu1EXrATGTT3VKbLzjtqXOUXKww7+hmH903VamgQKr0g8LlPrCNIRmeFc4XZqMxIXkBgJeb8WQue9Q4SxIyN7O4/1+c49u4tv9TnGhQElFh0UO2SepcNBc7XHqHQ7pUxHD1+jVreLvLuxFVpxI0WbTixeLzaLTSkKUgRop+gwK2QFKujOTwTXc2z7X2XIBskhbOtrcW2eLrVaCW4xgjqjzxjHjvCIjx891/kOwuRxheFcT1xyrUGCflx08bZlaBuygEkSkHq0E3uG9SJAUabyAlLgibLUWUvjif1KXsmoc0dV4vZsQTD3+FqQJ4 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB3775.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(396003)(39860400002)(376002)(366004)(136003)(346002)(478600001)(83380400001)(2906002)(2616005)(6636002)(8936002)(8676002)(31686004)(7416002)(4326008)(31696002)(5660300002)(52116002)(6486002)(316002)(66556008)(66476007)(86362001)(66946007)(54906003)(110136005)(36756003)(6666004)(53546011)(16526019)(186003)(43740500002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: d729d82f-a85e-4670-7983-08d8351f1070 X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB3775.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Jul 2020 06:58:01.5226 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: A6UtAKS1hfGcILrXzOJZ0IGwwmbn0dXmpupQBIfWkWnsZlC8xFKh8dvCB3W1b9wu X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4253 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am 31.07.20 um 08:53 schrieb Greg Kroah-Hartman: > On Thu, Jul 30, 2020 at 05:09:07PM -0400, Luben Tuikov wrote: >> On 2020-07-29 9:49 a.m., Alex Deucher wrote: >>> On Wed, Jul 29, 2020 at 4:11 AM Christian König >>> wrote: >>>> Am 28.07.20 um 21:29 schrieb Peilin Ye: >>>>> Compiler leaves a 4-byte hole near the end of `dev_info`, causing >>>>> amdgpu_info_ioctl() to copy uninitialized kernel stack memory to userspace >>>>> when `size` is greater than 356. >>>>> >>>>> In 2015 we tried to fix this issue by doing `= {};` on `dev_info`, which >>>>> unfortunately does not initialize that 4-byte hole. Fix it by using >>>>> memset() instead. >>>>> >>>>> Cc: stable@vger.kernel.org >>>>> Fixes: c193fa91b918 ("drm/amdgpu: information leak in amdgpu_info_ioctl()") >>>>> Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)") >>>>> Suggested-by: Dan Carpenter >>>>> Signed-off-by: Peilin Ye >>>> Reviewed-by: Christian König >>>> >>>> I can't count how many of those we have fixed over the years. >>>> >>>> At some point we should probably document that using "= {}" or "= { 0 }" >>>> in the kernel is a really bad idea and should be avoided. >>> Moreover, it seems like different compilers seem to behave relatively >>> differently with these and we often get reports of warnings with these >>> on clang. When in doubt, memset. >> There are quite a few of those under drivers/gpu/drm, for "amd/", "scheduler/" >> drm*.c files, >> >> $find . \( -regex "./drm.*\.c" -or -regex "./amd/.*\.c" -or -regex "./scheduler/.*\.c" \) -exec egrep -n -- " *= *{ *(|NULL|0) *}" \{\} \+ | wc -l >> 374 >> $_ >> >> Out of which only 16 are of the non-ISO C variety, "= {}", >> >> $find . \( -regex "./drm.*\.c" -or -regex "./amd/.*\.c" -or -regex "./scheduler/.*\.c" \) -exec egrep -n -- " *= *{ *}" \{\} \+ | wc -l >> 16 >> $_ >> >> Perhaps the latter are the more pressing ones, since it is a C++ initializer and not a ISO C one. > It only matters when we care copying the data to userspace, if it all > stays in the kernel, all is fine. Well only as long as you don't try to compute a CRC32, MD5 or any fingerprint for a hash from the bytes from the structure. Then it fails horrible and you wonder why the code doesn't works as expected. 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dkim=none (message not signed) header.d=none;lists.linuxfoundation.org; dmarc=none action=none header.from=amd.com; Received: from MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) by MN2PR12MB4253.namprd12.prod.outlook.com (2603:10b6:208:1de::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3239.17; Fri, 31 Jul 2020 06:58:01 +0000 Received: from MN2PR12MB3775.namprd12.prod.outlook.com ([fe80::a16e:8812:b4c0:918d]) by MN2PR12MB3775.namprd12.prod.outlook.com ([fe80::a16e:8812:b4c0:918d%6]) with mapi id 15.20.3239.020; Fri, 31 Jul 2020 06:58:01 +0000 To: Greg Kroah-Hartman , Luben Tuikov References: <20200728192924.441570-1-yepeilin.cs@gmail.com> <30b2a31f-77c2-56c1-ecde-875c6eea99d5@gmail.com> <8c5cf518-12d2-7495-7822-c7ebf8e61972@amd.com> <20200731065322.GA1518178@kroah.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <690213fd-d3d2-2253-dcb2-367a65b34f38@amd.com> Date: Fri, 31 Jul 2020 08:57:53 +0200 User-Agent: Mozilla/5.0 (X11; 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Fri, 31 Jul 2020 06:58:01 +0000 Subject: Re: [Linux-kernel-mentees] [PATCH] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl() To: Greg Kroah-Hartman , Luben Tuikov References: <20200728192924.441570-1-yepeilin.cs@gmail.com> <30b2a31f-77c2-56c1-ecde-875c6eea99d5@gmail.com> <8c5cf518-12d2-7495-7822-c7ebf8e61972@amd.com> <20200731065322.GA1518178@kroah.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <690213fd-d3d2-2253-dcb2-367a65b34f38@amd.com> Date: Fri, 31 Jul 2020 08:57:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200731065322.GA1518178@kroah.com> Content-Language: en-US X-ClientProxiedBy: AM3PR05CA0145.eurprd05.prod.outlook.com (2603:10a6:207:3::23) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7] (2a02:908:1252:fb60:be8a:bd56:1f94:86e7) by AM3PR05CA0145.eurprd05.prod.outlook.com (2603:10a6:207:3::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3239.16 via Frontend Transport; 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charset="utf-8"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" QW0gMzEuMDcuMjAgdW0gMDg6NTMgc2NocmllYiBHcmVnIEtyb2FoLUhhcnRtYW46Cj4gT24gVGh1 LCBKdWwgMzAsIDIwMjAgYXQgMDU6MDk6MDdQTSAtMDQwMCwgTHViZW4gVHVpa292IHdyb3RlOgo+ PiBPbiAyMDIwLTA3LTI5IDk6NDkgYS5tLiwgQWxleCBEZXVjaGVyIHdyb3RlOgo+Pj4gT24gV2Vk LCBKdWwgMjksIDIwMjAgYXQgNDoxMSBBTSBDaHJpc3RpYW4gS8O2bmlnCj4+PiA8Y2tvZW5pZy5s ZWljaHR6dW1lcmtlbkBnbWFpbC5jb20+IHdyb3RlOgo+Pj4+IEFtIDI4LjA3LjIwIHVtIDIxOjI5 IHNjaHJpZWIgUGVpbGluIFllOgo+Pj4+PiBDb21waWxlciBsZWF2ZXMgYSA0LWJ5dGUgaG9sZSBu ZWFyIHRoZSBlbmQgb2YgYGRldl9pbmZvYCwgY2F1c2luZwo+Pj4+PiBhbWRncHVfaW5mb19pb2N0 bCgpIHRvIGNvcHkgdW5pbml0aWFsaXplZCBrZXJuZWwgc3RhY2sgbWVtb3J5IHRvIHVzZXJzcGFj ZQo+Pj4+PiB3aGVuIGBzaXplYCBpcyBncmVhdGVyIHRoYW4gMzU2Lgo+Pj4+Pgo+Pj4+PiBJbiAy MDE1IHdlIHRyaWVkIHRvIGZpeCB0aGlzIGlzc3VlIGJ5IGRvaW5nIGA9IHt9O2Agb24gYGRldl9p bmZvYCwgd2hpY2gKPj4+Pj4gdW5mb3J0dW5hdGVseSBkb2VzIG5vdCBpbml0aWFsaXplIHRoYXQg NC1ieXRlIGhvbGUuIEZpeCBpdCBieSB1c2luZwo+Pj4+PiBtZW1zZXQoKSBpbnN0ZWFkLgo+Pj4+ Pgo+Pj4+PiBDYzogc3RhYmxlQHZnZXIua2VybmVsLm9yZwo+Pj4+PiBGaXhlczogYzE5M2ZhOTFi OTE4ICgiZHJtL2FtZGdwdTogaW5mb3JtYXRpb24gbGVhayBpbiBhbWRncHVfaW5mb19pb2N0bCgp IikKPj4+Pj4gRml4ZXM6IGQzOGNlYWY5OWVkMCAoImRybS9hbWRncHU6IGFkZCBjb3JlIGRyaXZl ciAodjQpIikKPj4+Pj4gU3VnZ2VzdGVkLWJ5OiBEYW4gQ2FycGVudGVyIDxkYW4uY2FycGVudGVy QG9yYWNsZS5jb20+Cj4+Pj4+IFNpZ25lZC1vZmYtYnk6IFBlaWxpbiBZZSA8eWVwZWlsaW4uY3NA Z21haWwuY29tPgo+Pj4+IFJldmlld2VkLWJ5OiBDaHJpc3RpYW4gS8O2bmlnIDxjaHJpc3RpYW4u a29lbmlnQGFtZC5jb20+Cj4+Pj4KPj4+PiBJIGNhbid0IGNvdW50IGhvdyBtYW55IG9mIHRob3Nl IHdlIGhhdmUgZml4ZWQgb3ZlciB0aGUgeWVhcnMuCj4+Pj4KPj4+PiBBdCBzb21lIHBvaW50IHdl IHNob3VsZCBwcm9iYWJseSBkb2N1bWVudCB0aGF0IHVzaW5nICI9IHt9IiBvciAiPSB7IDAgfSIK Pj4+PiBpbiB0aGUga2VybmVsIGlzIGEgcmVhbGx5IGJhZCBpZGVhIGFuZCBzaG91bGQgYmUgYXZv aWRlZC4KPj4+IE1vcmVvdmVyLCBpdCBzZWVtcyBsaWtlIGRpZmZlcmVudCBjb21waWxlcnMgc2Vl bSB0byBiZWhhdmUgcmVsYXRpdmVseQo+Pj4gZGlmZmVyZW50bHkgd2l0aCB0aGVzZSBhbmQgd2Ug b2Z0ZW4gZ2V0IHJlcG9ydHMgb2Ygd2FybmluZ3Mgd2l0aCB0aGVzZQo+Pj4gb24gY2xhbmcuICBX aGVuIGluIGRvdWJ0LCBtZW1zZXQuCj4+IFRoZXJlIGFyZSBxdWl0ZSBhIGZldyBvZiB0aG9zZSB1 bmRlciBkcml2ZXJzL2dwdS9kcm0sIGZvciAiYW1kLyIsICJzY2hlZHVsZXIvIgo+PiBkcm0qLmMg ZmlsZXMsCj4+Cj4+ICRmaW5kIC4gXCggLXJlZ2V4ICIuL2RybS4qXC5jIiAtb3IgLXJlZ2V4ICIu L2FtZC8uKlwuYyIgLW9yIC1yZWdleCAiLi9zY2hlZHVsZXIvLipcLmMiIFwpIC1leGVjIGVncmVw IC1uIC0tICIgKj0gKnsgKih8TlVMTHwwKSAqfSIgXHtcfSBcKyB8IHdjIC1sCj4+IDM3NAo+PiAk Xwo+Pgo+PiBPdXQgb2Ygd2hpY2ggb25seSAxNiBhcmUgb2YgdGhlIG5vbi1JU08gQyB2YXJpZXR5 LCAiPSB7fSIsCj4+Cj4+ICRmaW5kIC4gXCggLXJlZ2V4ICIuL2RybS4qXC5jIiAtb3IgLXJlZ2V4 ICIuL2FtZC8uKlwuYyIgLW9yIC1yZWdleCAiLi9zY2hlZHVsZXIvLipcLmMiIFwpIC1leGVjIGVn cmVwIC1uIC0tICIgKj0gKnsgKn0iIFx7XH0gXCsgfCB3YyAtbAo+PiAxNgo+PiAkXwo+Pgo+PiBQ ZXJoYXBzIHRoZSBsYXR0ZXIgYXJlIHRoZSBtb3JlIHByZXNzaW5nIG9uZXMsIHNpbmNlIGl0IGlz IGEgQysrIGluaXRpYWxpemVyIGFuZCBub3QgYSBJU08gQyBvbmUuCj4gSXQgb25seSBtYXR0ZXJz IHdoZW4gd2UgY2FyZSBjb3B5aW5nIHRoZSBkYXRhIHRvIHVzZXJzcGFjZSwgaWYgaXQgYWxsCj4g c3RheXMgaW4gdGhlIGtlcm5lbCwgYWxsIGlzIGZpbmUuCgpXZWxsIG9ubHkgYXMgbG9uZyBhcyB5 b3UgZG9uJ3QgdHJ5IHRvIGNvbXB1dGUgYSBDUkMzMiwgTUQ1IG9yIGFueSAKZmluZ2VycHJpbnQg Zm9yIGEgaGFzaCBmcm9tIHRoZSBieXRlcyBmcm9tIHRoZSBzdHJ1Y3R1cmUuCgpUaGVuIGl0IGZh aWxzIGhvcnJpYmxlIGFuZCB5b3Ugd29uZGVyIHdoeSB0aGUgY29kZSBkb2Vzbid0IHdvcmtzIGFz IApleHBlY3RlZC4KClJlZ2FyZHMsCkNocmlzdGlhbi4KCj4KPiB0aGFua3MsCj4KPiBncmVnIGst aAoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KZHJpLWRl dmVsIG1haWxpbmcgbGlzdApkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnCmh0dHBzOi8v bGlzdHMuZnJlZWRlc2t0b3Aub3JnL21haWxtYW4vbGlzdGluZm8vZHJpLWRldmVsCg== 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=-9.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 59301C433E1 for ; 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Fri, 31 Jul 2020 06:58:01 +0000 Subject: Re: [Linux-kernel-mentees] [PATCH] drm/amdgpu: Prevent kernel-infoleak in amdgpu_info_ioctl() To: Greg Kroah-Hartman , Luben Tuikov References: <20200728192924.441570-1-yepeilin.cs@gmail.com> <30b2a31f-77c2-56c1-ecde-875c6eea99d5@gmail.com> <8c5cf518-12d2-7495-7822-c7ebf8e61972@amd.com> <20200731065322.GA1518178@kroah.com> From: =?UTF-8?Q?Christian_K=c3=b6nig?= Message-ID: <690213fd-d3d2-2253-dcb2-367a65b34f38@amd.com> Date: Fri, 31 Jul 2020 08:57:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 In-Reply-To: <20200731065322.GA1518178@kroah.com> Content-Language: en-US X-ClientProxiedBy: AM3PR05CA0145.eurprd05.prod.outlook.com (2603:10a6:207:3::23) To MN2PR12MB3775.namprd12.prod.outlook.com (2603:10b6:208:159::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2a02:908:1252:fb60:be8a:bd56:1f94:86e7] (2a02:908:1252:fb60:be8a:bd56:1f94:86e7) by AM3PR05CA0145.eurprd05.prod.outlook.com (2603:10a6:207:3::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3239.16 via Frontend Transport; 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