From patchwork Wed Dec 21 14:10:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 13078812 X-Patchwork-Delegate: paul@paul-moore.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 018E1C41535 for ; Wed, 21 Dec 2022 14:10:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229547AbiLUOKg (ORCPT ); Wed, 21 Dec 2022 09:10:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229791AbiLUOKf (ORCPT ); Wed, 21 Dec 2022 09:10:35 -0500 Received: from frasgout12.his.huawei.com (frasgout12.his.huawei.com [14.137.139.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDCD423BEC; Wed, 21 Dec 2022 06:10:31 -0800 (PST) Received: from mail02.huawei.com (unknown [172.18.147.227]) by frasgout12.his.huawei.com (SkyGuard) with ESMTP id 4NcZsm2fxLz9xFrp; Wed, 21 Dec 2022 22:03:24 +0800 (CST) Received: from huaweicloud.com (unknown [10.204.63.22]) by APP2 (Coremail) with SMTP id GxC2BwAH2F7DE6NjUuUvAA--.8166S2; Wed, 21 Dec 2022 15:10:18 +0100 (CET) From: Roberto Sassu To: paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, Roberto Sassu , stable@vger.kernel.org Subject: [PATCH v2] security: Restore passing final prot to ima_file_mmap() Date: Wed, 21 Dec 2022 15:10:07 +0100 Message-Id: <20221221141007.2579770-1-roberto.sassu@huaweicloud.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: GxC2BwAH2F7DE6NjUuUvAA--.8166S2 X-Coremail-Antispam: 1UD129KBjvJXoW7AFW7AF45ArW3Gw1kGF1rJFb_yoW8Xr1fpa y5t3WUKrs5JFyFqFn7WFW7CF1Sk39xKFWUWan2gryj93Z8XFnYkr15AFWj9ry8Xrn5JFyF qw12k3y3A3Wqy3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUk2b4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxV AFwI0_Gr1j6F4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG 6I80ewAv7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFV Cjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4IIrI8v6xkF7I0E8cxan2IY04v7MxAIw28I cxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2 IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI 42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42 IY6xAIw20EY4v20xvaj40_Zr0_Wr1UMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2 jsIEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIevJa73UjIFyTuYvjxUOyCJDUUUU X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAgANBF1jj4LnoQAAs+ X-CFilter-Loop: Reflected Precedence: bulk List-ID: From: Roberto Sassu Commit 98de59bfe4b2f ("take calculation of final prot in security_mmap_file() into a helper") moved the code to update prot with the actual protection flags to be granted to the requestor by the kernel to a helper called mmap_prot(). However, the patch didn't update the argument passed to ima_file_mmap(), making it receive the requested prot instead of the final computed prot. A possible consequence is that files mmapped as executable might not be measured/appraised if PROT_EXEC is not requested but subsequently added in the final prot. Replace prot with mmap_prot(file, prot) as the second argument of ima_file_mmap() to restore the original behavior. Cc: stable@vger.kernel.org Fixes: 98de59bfe4b2 ("take calculation of final prot in security_mmap_file() into a helper") Signed-off-by: Roberto Sassu --- security/security.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/security/security.c b/security/security.c index d1571900a8c7..0d2359d588a1 100644 --- a/security/security.c +++ b/security/security.c @@ -1666,7 +1666,7 @@ int security_mmap_file(struct file *file, unsigned long prot, mmap_prot(file, prot), flags); if (ret) return ret; - return ima_file_mmap(file, prot); + return ima_file_mmap(file, mmap_prot(file, prot)); } int security_mmap_addr(unsigned long addr)