From patchwork Mon Nov 28 14:42:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 13057617 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 DA4B8C63706 for ; Mon, 28 Nov 2022 14:44:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232627AbiK1Onm (ORCPT ); Mon, 28 Nov 2022 09:43:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232616AbiK1OnL (ORCPT ); Mon, 28 Nov 2022 09:43:11 -0500 Received: from frasgout12.his.huawei.com (frasgout12.his.huawei.com [14.137.139.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4226AF3D; Mon, 28 Nov 2022 06:43:09 -0800 (PST) Received: from mail02.huawei.com (unknown [172.18.147.229]) by frasgout12.his.huawei.com (SkyGuard) with ESMTP id 4NLShl3G7Cz9xGXF; Mon, 28 Nov 2022 22:36:39 +0800 (CST) Received: from huaweicloud.com (unknown [10.204.63.22]) by APP1 (Coremail) with SMTP id LxC2BwC3oG3iyIRjL9qiAA--.42928S2; Mon, 28 Nov 2022 15:42:49 +0100 (CET) From: Roberto Sassu To: paul@paul-moore.com, casey@schaufler-ca.com, omosnace@redhat.com, john.johansen@canonical.com, kpsingh@kernel.org Cc: bpf@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Roberto Sassu Subject: [PATCH v2 0/2] lsm: Improve LSM hooks documentation Date: Mon, 28 Nov 2022 15:42:38 +0100 Message-Id: <20221128144240.210110-1-roberto.sassu@huaweicloud.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: LxC2BwC3oG3iyIRjL9qiAA--.42928S2 X-Coremail-Antispam: 1UD129KBjvJXoW7Ar4DXw43JF45WF1DAw4UXFb_yoW8XF47pa yrGw45JryrAr1xurs3Kw48A3yFyFWrGF1DJrW7Grn5urWjyr1Fkr4Skw1Fgas8CF9xKa4q qF12vry5urnrA3DanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkFb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv6xkF7I 0E14v26r4j6r4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG 6I80ewAv7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFV Cjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxkF7I0En4kS14v26r4a6rW5MxAIw28IcxkI 7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxV Cjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY 6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcV CF04k26cxKx2IYs7xG6rWUJVWrZr1UMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2 jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07jzQ6JUUUUU= X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAQAKBF1jj4X7EgABsT X-CFilter-Loop: Reflected Precedence: bulk List-ID: From: Roberto Sassu The recent discussion about return values from LSM hooks, available here: https://lore.kernel.org/bpf/20221115175652.3836811-1-roberto.sassu@huaweicloud.com/ motivated revisiting the documentation in include/linux/lsm_hooks.h, to ensure that it is complete and accurate. It was also a good occasion to fix discovered formatting issues. Changelog: v1 (security: Ensure LSMs return expected values): - A positive value, not only 1 can cause cap_set_admin to be set when calling __vm_enough_memory() (reported by Paul) - Improve description of the vm_enough_memory hook - Remove documentation of the sb_add_mnt_opt hook, as it was removed (reported by Paul) - Add more periods in the parameters description - Adjust mmap_addr and mmap_file semicolon - Move description of gfp parameter of xfrm_policy_alloc_security together with the others - Add missing return value description for binder_transaction, binder_transfer_binder, binder_transfer_file, quotactl and quota_on - Improve return value description for sb_eat_lsm_opts, sb_show_options, dentry_init_security, dentry_create_files_as and sctp_assoc_established Roberto Sassu (2): lsm: Clarify documentation of vm_enough_memory hook lsm: Add/fix return values in lsm_hooks.h and fix formatting include/linux/lsm_hooks.h | 227 ++++++++++++++++++++++++-------------- 1 file changed, 143 insertions(+), 84 deletions(-) Reviewed-by: Casey Schaufler