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Sat, 3 Mar 2018 18:22:22 -0500 Received: from mail-co1nam03on0134.outbound.protection.outlook.com ([104.47.40.134]:45128 "EHLO NAM03-CO1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934768AbeCCWhy (ORCPT ); Sat, 3 Mar 2018 17:37:54 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Mimi Zohar , Sasha Levin Subject: [PATCH AUTOSEL for 4.9 219/219] ima: relax requiring a file signature for new files with zero length Thread-Topic: [PATCH AUTOSEL for 4.9 219/219] ima: relax requiring a file signature for new files with zero length Thread-Index: AQHTsz8sJL2jPdDcjUyzKob9eEMMxQ== Date: Sat, 3 Mar 2018 22:30:03 +0000 Message-ID: <20180303222716.26640-219-alexander.levin@microsoft.com> References: <20180303222716.26640-1-alexander.levin@microsoft.com> In-Reply-To: <20180303222716.26640-1-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;MW2PR2101MB1100;7:7Ska4rohhWVIJfORRmFJRTnYWVWTL+mjpTDARMYPtUe9M/cBMLxaLdavMsHKY07DS7KEZdufoTJN1iHPWJ51POwjUaUEglYfDJFk/EPf8BUMRKz8IEPDAvFv9tt3pNWZIAacav9aiwmjMwTfgY4JPNj3Lhcolbt86wM8o9gx4NGFjTwUQmYaaVAqjAQuZF/2m4mY1yKQ6XO4B+PIpmYpD87KK5Y6JMKV4m8bdobYObdo7dpGRul4LQXhtOqZ3tF/ x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 1c2e98ea-8853-4cb7-e660-08d5815765f2 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(4534165)(4627221)(201703031133081)(201702281549075)(48565401081)(5600026)(4604075)(3008032)(2017052603307)(7193020);SRVR:MW2PR2101MB1100; 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x-microsoft-antispam-message-info: PFuVDgqzI9A650TGDShWblAV5cCOKAQBg5bHA7jCHD2RvLmlipTzSB2mH0+yAg6fTYa9dYLkwIUwq5OXrjEo0iX5LsNpdTAMciOAuyszs6F0WuAaVMx7zJ8iKCfhZmQ8r6Nyk30UfFwWUHB6/74yMG5CgoLeEBn6+QZ2SVrYN54= 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: 1c2e98ea-8853-4cb7-e660-08d5815765f2 X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2018 22:30:03.7758 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1100 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: Mimi Zohar [ Upstream commit b7e27bc1d42e8e0cc58b602b529c25cd0071b336 ] Custom policies can require file signatures based on LSM labels. These files are normally created and only afterwards labeled, requiring them to be signed. Instead of requiring file signatures based on LSM labels, entire filesystems could require file signatures. In this case, we need the ability of writing new files without requiring file signatures. The definition of a "new" file was originally defined as any file with a length of zero. Subsequent patches redefined a "new" file to be based on the FILE_CREATE open flag. By combining the open flag with a file size of zero, this patch relaxes the file signature requirement. Fixes: 1ac202e978e1 ima: accept previously set IMA_NEW_FILE Signed-off-by: Mimi Zohar Signed-off-by: Sasha Levin --- security/integrity/ima/ima_appraise.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima= /ima_appraise.c index 6830d2427e47..7bf8b005a178 100644 --- a/security/integrity/ima/ima_appraise.c +++ b/security/integrity/ima/ima_appraise.c @@ -207,7 +207,8 @@ int ima_appraise_measurement(enum ima_hooks func, if (opened & FILE_CREATED) iint->flags |=3D IMA_NEW_FILE; if ((iint->flags & IMA_NEW_FILE) && - !(iint->flags & IMA_DIGSIG_REQUIRED)) + (!(iint->flags & IMA_DIGSIG_REQUIRED) || + (inode->i_size =3D=3D 0))) status =3D INTEGRITY_PASS; goto out; } --=20 2.14.1