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Fri, 21 Aug 2020 15:46:09 +0000 Subject: Re: [PATCH bpf-next v3 4/6] bpf: override the meaning of ARG_PTR_TO_MAP_VALUE for sockmap and sockhash To: Lorenz Bauer , , , Alexei Starovoitov , Daniel Borkmann CC: , , , References: <20200821102948.21918-1-lmb@cloudflare.com> <20200821102948.21918-5-lmb@cloudflare.com> From: Yonghong Song Message-ID: Date: Fri, 21 Aug 2020 08:46:05 -0700 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 In-Reply-To: <20200821102948.21918-5-lmb@cloudflare.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BL1PR13CA0036.namprd13.prod.outlook.com (2603:10b6:208:257::11) To BYAPR15MB4088.namprd15.prod.outlook.com (2603:10b6:a02:c3::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by BL1PR13CA0036.namprd13.prod.outlook.com (2603:10b6:208:257::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3326.10 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: 9afca455-4227-40ca-021a-08d845e952f5 X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB4088.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Aug 2020 15:46:09.6978 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IS+mQUTi+bi7CVLndCtFptqOB8fnqDsCd7EQYyjLzZiTNkGRPyUDBhW/Y9E0a0Lq X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB3046 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-08-21_08:2020-08-21,2020-08-21 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 malwarescore=0 mlxlogscore=545 priorityscore=1501 impostorscore=0 clxscore=1015 phishscore=0 suspectscore=0 adultscore=0 bulkscore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008210147 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/21/20 3:29 AM, Lorenz Bauer wrote: > The verifier assumes that map values are simple blobs of memory, and > therefore treats ARG_PTR_TO_MAP_VALUE, etc. as such. However, there are > map types where this isn't true. For example, sockmap and sockhash store > sockets. In general this isn't a big problem: we can just > write helpers that explicitly requests PTR_TO_SOCKET instead of > ARG_PTR_TO_MAP_VALUE. > > The one exception are the standard map helpers like map_update_elem, > map_lookup_elem, etc. Here it would be nice we could overload the > function prototype for different kinds of maps. Unfortunately, this > isn't entirely straight forward: > We only know the type of the map once we have resolved meta->map_ptr > in check_func_arg. This means we can't swap out the prototype > in check_helper_call until we're half way through the function. > > Instead, modify check_func_arg to treat ARG_PTR_TO_MAP_VALUE to > mean "the native type for the map" instead of "pointer to memory" > for sockmap and sockhash. This means we don't have to modify the > function prototype at all > > Signed-off-by: Lorenz Bauer Acked-by: Yonghong Song