From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-3.9 required=3.0 tests=AWL,BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,T_DKIMWL_WL_HIGH shortcircuit=no autolearn=ham autolearn_force=no version=3.4.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id 3314A1F403 for ; Wed, 6 Jun 2018 11:37:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752094AbeFFLhL (ORCPT ); Wed, 6 Jun 2018 07:37:11 -0400 Received: from mail-co1nam03on0101.outbound.protection.outlook.com ([104.47.40.101]:10314 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751911AbeFFLgi (ORCPT ); Wed, 6 Jun 2018 07:36:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=t5gsHRKDBbomD/aT5nanEXiT7oS+ND6PQ9WUZHEIzEg=; b=cN8Ek82lpwZns+qv0jikGko5bW6nvAhwk+3VuhpT3Et4LEj/xveosYxTQ4ZdK4dKSgDTFOhZr8/oWSQ2gkpY9tegfDPn6h9Q5wkEtYQhu/JxeiMmNs/6im9IiTq/+gTUZqt1Xo7y0oR3ELzOPjWTQHvKSQW3TF9BBRj9UjOlj3o= Received: from BL0PR2101MB1011.namprd21.prod.outlook.com (52.132.24.10) by BL0PR2101MB1044.namprd21.prod.outlook.com (52.132.24.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.863.2; Wed, 6 Jun 2018 11:36:36 +0000 Received: from BL0PR2101MB1011.namprd21.prod.outlook.com ([fe80::d1f2:1d69:2567:e0a9]) by BL0PR2101MB1011.namprd21.prod.outlook.com ([fe80::d1f2:1d69:2567:e0a9%2]) with mapi id 15.20.0863.004; Wed, 6 Jun 2018 11:36:36 +0000 From: Derrick Stolee To: "git@vger.kernel.org" CC: "stolee@gmail.com" , "jnareb@gmail.com" , "avarab@gmail.com" , "marten.agren@gmail.com" , "gitster@pobox.com" , Derrick Stolee Subject: [PATCH v5 16/21] commit-graph: verify contents match checksum Thread-Topic: [PATCH v5 16/21] commit-graph: verify contents match checksum Thread-Index: AQHT/YqgfJB4xR5EOkW/H1n5BZ7Wgw== Date: Wed, 6 Jun 2018 11:36:36 +0000 Message-ID: <20180606113611.87822-17-dstolee@microsoft.com> References: <20180604165200.29261-1-dstolee@microsoft.com> <20180606113611.87822-1-dstolee@microsoft.com> In-Reply-To: <20180606113611.87822-1-dstolee@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BN4PR11CA0018.namprd11.prod.outlook.com (2603:10b6:403:1::28) To BL0PR2101MB1011.namprd21.prod.outlook.com (2603:10b6:207:37::10) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [2001:4898:8010:0:eb4a:5dff:fe0f:730f] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;BL0PR2101MB1044;7:/Qfvfbw7cR8GQWyb3Toi23Pnv/41I+a3BB+uo6LVPv0UA5O8uWgw8D/CCnxwelJ3+wQthXwuBTzGVTSd3MeyF4ksqKwW8P3n5Da6ZJEZR8mABAwNu+QNwv+KDBWix3N7L35qOTFpPMXgJgTpsps5zf3YhZpVFfosqHZt4kHFGVJq2hdOLTJPn60Fiog7oyxK8KW6s7Gvj64/jI6EI0C1qRr4fBImU9ktMUMhnk1cTY8EJipxatXUphuSyzDIPulf x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:BL0PR2101MB1044; x-ms-traffictypediagnostic: BL0PR2101MB1044: authentication-results: spf=none (sender IP is ) smtp.mailfrom=dstolee@microsoft.com; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:(28532068793085)(89211679590171); x-ms-exchange-senderadcheck: 1 x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(8211001083)(6040522)(2401047)(5005006)(8121501046)(3231254)(2018427008)(944501410)(52105095)(3002001)(10201501046)(93006095)(93001095)(6055026)(149027)(150027)(6041310)(20161123564045)(20161123562045)(20161123560045)(20161123558120)(201703131423095)(201702281528075)(20161123555045)(201703061421075)(201703061406153)(6072148)(201708071742011)(7699016);SRVR:BL0PR2101MB1044;BCL:0;PCL:0;RULEID:;SRVR:BL0PR2101MB1044; x-forefront-prvs: 06952FC175 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(1496009)(39860400002)(396003)(376002)(346002)(39380400002)(366004)(199004)(189003)(2616005)(316002)(22452003)(10090500001)(105586002)(86612001)(10290500003)(107886003)(14454004)(8656006)(1730700003)(52116002)(76176011)(6506007)(386003)(8936002)(478600001)(8676002)(106356001)(102836004)(59450400001)(81156014)(25786009)(2351001)(486006)(11346002)(476003)(446003)(54906003)(4326008)(186003)(305945005)(7736002)(2900100001)(97736004)(46003)(2501003)(99286004)(81166006)(36756003)(39060400002)(15650500001)(6916009)(5660300001)(5250100002)(3280700002)(53936002)(68736007)(2906002)(86362001)(6116002)(6436002)(575784001)(6512007)(6486002)(1076002)(5640700003)(3660700001)(22906009);DIR:OUT;SFP:1102;SCL:1;SRVR:BL0PR2101MB1044;H:BL0PR2101MB1011.namprd21.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: Cq10LpvPqtF6wkAoX7W2j0wFXtF0PcNbO2KabWixYLPt595Jb6qY7fgjscypU05IQ91VD9HCoUO0oj5goPw02NQFMuTNQ5zDVPS8eZ8+vZ2Dpc1suv8LCYG5Y1QWPXmmNEpgODyvGzL+QyPbJV+JN69Sn0NC4zFG6IZPARrZlsMBmuD6oUtrf4/iPn8h6e5c spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 9cb08640-f75d-4f93-8377-08d5cba1c2b3 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9cb08640-f75d-4f93-8377-08d5cba1c2b3 X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Jun 2018 11:36:36.3533 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR2101MB1044 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org The commit-graph file ends with a SHA1 hash of the previous contents. If a commit-graph file has errors but the checksum hash is correct, then we know that the problem is a bug in Git and not simply file corruption after-the-fact. Compute the checksum right away so it is the first error that appears, and make the message translatable since this error can be "corrected" by a user by simply deleting the file and recomputing. The rest of the errors are useful only to developers. Be sure to continue checking the rest of the file data if the checksum is wrong. This is important for our tests, as we break the checksum as we modify bytes of the commit-graph file. Signed-off-by: Derrick Stolee --- commit-graph.c | 16 ++++++++++++++-- t/t5318-commit-graph.sh | 6 ++++++ 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/commit-graph.c b/commit-graph.c index d83f0ce5d5..0f93d5d864 100644 --- a/commit-graph.c +++ b/commit-graph.c @@ -832,6 +832,7 @@ void write_commit_graph(const char *obj_dir, oids.nr =3D 0; } =20 +#define VERIFY_COMMIT_GRAPH_ERROR_HASH 2 static int verify_commit_graph_error; =20 static void graph_report(const char *fmt, ...) @@ -851,8 +852,10 @@ static void graph_report(const char *fmt, ...) int verify_commit_graph(struct commit_graph *g) { uint32_t i, cur_fanout_pos =3D 0; - struct object_id prev_oid, cur_oid; + struct object_id prev_oid, cur_oid, checksum; int generation_zero =3D 0; + struct hashfile *f; + int devnull; =20 if (!g) { graph_report("no commit-graph file loaded"); @@ -871,6 +874,15 @@ int verify_commit_graph(struct commit_graph *g) if (verify_commit_graph_error) return verify_commit_graph_error; =20 + devnull =3D open("/dev/null", O_WRONLY); + f =3D hashfd(devnull, NULL); + hashwrite(f, g->data, g->data_len - g->hash_len); + finalize_hashfile(f, checksum.hash, CSUM_CLOSE); + if (hashcmp(checksum.hash, g->data + g->data_len - g->hash_len)) { + graph_report(_("the commit-graph file has incorrect checksum and is like= ly corrupt")); + verify_commit_graph_error =3D VERIFY_COMMIT_GRAPH_ERROR_HASH; + } + for (i =3D 0; i < g->num_commits; i++) { struct commit *graph_commit; =20 @@ -908,7 +920,7 @@ int verify_commit_graph(struct commit_graph *g) cur_fanout_pos++; } =20 - if (verify_commit_graph_error) + if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH) return verify_commit_graph_error; =20 for (i =3D 0; i < g->num_commits; i++) { diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh index cf67fb391a..2297a44e7d 100755 --- a/t/t5318-commit-graph.sh +++ b/t/t5318-commit-graph.sh @@ -279,6 +279,7 @@ GRAPH_COMMIT_DATA_WIDTH=3D$(($HASH_LEN + 16)) GRAPH_OCTOPUS_DATA_OFFSET=3D$(($GRAPH_COMMIT_DATA_OFFSET + \ $GRAPH_COMMIT_DATA_WIDTH \* $NUM_COMMITS)) GRAPH_BYTE_OCTOPUS=3D$(($GRAPH_OCTOPUS_DATA_OFFSET + 4)) +GRAPH_BYTE_FOOTER=3D$(($GRAPH_OCTOPUS_DATA_OFFSET + 4 \* $NUM_OCTOPUS_EDGE= S)) =20 # usage: corrupt_graph_and_verify # Manipulates the commit-graph file at the position @@ -393,4 +394,9 @@ test_expect_success 'detect incorrect parent for octopu= s merge' ' "invalid parent" ' =20 +test_expect_success 'detect invalid checksum hash' ' + corrupt_graph_and_verify $GRAPH_BYTE_FOOTER "\00" \ + "incorrect checksum" +' + test_done --=20 2.18.0.rc1