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Sun, 28 Jan 2018 17:30:02 -0500 Received: from mail-cys01nam02on0124.outbound.protection.outlook.com ([104.47.37.124]:11968 "EHLO NAM02-CY1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753569AbeA1W3x (ORCPT ); Sun, 28 Jan 2018 17:29:53 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Eric Biggers , Eric Biggers , David Howells , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 21/36] 509: fix printing uninitialized stack memory when OID is empty Thread-Topic: [PATCH AUTOSEL for 4.4 21/36] 509: fix printing uninitialized stack memory when OID is empty Thread-Index: AQHTmIdXV3xDrB2I20u3tyerJCxzpQ== Date: Sun, 28 Jan 2018 22:28:38 +0000 Message-ID: <20180128222815.29479-21-alexander.levin@microsoft.com> References: <20180128222815.29479-1-alexander.levin@microsoft.com> In-Reply-To: <20180128222815.29479-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MW2PR2101MB1114;6:3X8nkvQUtMfJg8JTlFSzSndpengSOw/ZY+/v/+G18T9pvpOBSXjbQHBrQt28V2AYK9oqkytuQdQkgI/mwYSsRuPQuI20GXp1JAS9EIXVln7tFdM2VMCs3Wxm0OBWpmgK9Z/XuZrdPz0jvAoBC4/pCj9uMzdjQr//3cw9OjgKt8UDJDc3abu9W//uaOoT2dHA7o5YJZFVENfB8fyoI90uRaH4MWCUPpk97B5UX7mMSbSkDdsYAsxftgvG6HiA7cbzq4ioFK+daoL7+RAvyhMUj3P6Je9oa46rXmXMWI3i22c9hEMBAymfmySr9cHzbN+lv9Cmdn63yvInWwwQnGBBzgURm2tTU13fIGK4xODpNgAK5ffc4+GrqBDa6iFcuNlr;5:bj92udChH5lTbdJED+QOkANaeH7GAiOKtJnz670ER8uWaYYtrjCZPzgcGaof/tDxd51JZ/fqt8VKeZ4NLSaAxogsYggquL0hC+FxR/YTfJ4ZTKqY61/3GXprOPFelnUqRJwcAzkVcHdh73iOF3feOqLdI10F90b4pYkReAl149k=;24:Xdq1Ou0ge5MDEAdApMhEPmvwklXrULNQ/mu+iWV3VxRbqFeCIv1jwM/WM35fP8GLJJBli8a+ISWwMw0HnkP2CVeJVXSC7GCpD8OwZxL+PZE=;7:zdM9cKD1F68C5Z2gmYYOKnNjNa/JfHDW2H9GZotUEG9DRbVG9EzB5H0QuZ9OP9aID3512bk6tnafQj2zKzyIr/tp6KmUCArtdYVa6ZMGM6hSVULqtiiBsysXKDF+/E03grOnp3jWZbMDXEhpuIHpIXcqY3Rh0uLAeb6pzlaSxsYFI1A0+Wrmty7JMjr4naYZH71pkNXrVevYwCwONiNSKFlsD+5CulKhmcsdUrmvsumVdvr3967YYMG22uLxt0rd x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: d30f9e17-727e-42b0-82a9-08d5669ea516 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1114; 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x-microsoft-antispam-message-info: ruHtH87w35guWKWB6PSbG6+ToGRLot42JuTepfcJ37q6puUoR18YHu71yVUSiErs+B3iQBC4f3NZgJPOJa3B8w== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: d30f9e17-727e-42b0-82a9-08d5669ea516 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Jan 2018 22:28:38.0342 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1114 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Eric Biggers [ Upstream commit 8dfd2f22d3bf3ab7714f7495ad5d897b8845e8c1 ] Callers of sprint_oid() do not check its return value before printing the result. In the case where the OID is zero-length, -EBADMSG was being returned without anything being written to the buffer, resulting in uninitialized stack memory being printed. Fix this by writing "(bad)" to the buffer in the cases where -EBADMSG is returned. Fixes: 4f73175d0375 ("X.509: Add utility functions to render OIDs as string= s") Signed-off-by: Eric Biggers Signed-off-by: David Howells Signed-off-by: Sasha Levin --- lib/oid_registry.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/lib/oid_registry.c b/lib/oid_registry.c index 318f382a010d..150e04d70303 100644 --- a/lib/oid_registry.c +++ b/lib/oid_registry.c @@ -116,7 +116,7 @@ int sprint_oid(const void *data, size_t datasize, char = *buffer, size_t bufsize) int count; =20 if (v >=3D end) - return -EBADMSG; + goto bad; =20 n =3D *v++; ret =3D count =3D snprintf(buffer, bufsize, "%u.%u", n / 40, n % 40); @@ -134,7 +134,7 @@ int sprint_oid(const void *data, size_t datasize, char = *buffer, size_t bufsize) num =3D n & 0x7f; do { if (v >=3D end) - return -EBADMSG; + goto bad; n =3D *v++; num <<=3D 7; num |=3D n & 0x7f; @@ -148,6 +148,10 @@ int sprint_oid(const void *data, size_t datasize, char= *buffer, size_t bufsize) } =20 return ret; + +bad: + snprintf(buffer, bufsize, "(bad)"); + return -EBADMSG; } EXPORT_SYMBOL_GPL(sprint_oid); =20 --=20 2.11.0