From mboxrd@z Thu Jan 1 00:00:00 1970 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 E2054C61DB3 for ; Tue, 10 Jan 2023 09:04:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232097AbjAJJE3 (ORCPT ); Tue, 10 Jan 2023 04:04:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238393AbjAJI7T (ORCPT ); Tue, 10 Jan 2023 03:59:19 -0500 Received: from frasgout11.his.huawei.com (frasgout11.his.huawei.com [14.137.139.23]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0199B5274D; Tue, 10 Jan 2023 00:56:56 -0800 (PST) Received: from mail02.huawei.com (unknown [172.18.147.229]) by frasgout11.his.huawei.com (SkyGuard) with ESMTP id 4Nrkxx5WFmz9v7gM; Tue, 10 Jan 2023 16:49:09 +0800 (CST) Received: from roberto-ThinkStation-P620 (unknown [10.204.63.22]) by APP2 (Coremail) with SMTP id GxC2BwAH3GIwKL1jw9uDAA--.1874S2; Tue, 10 Jan 2023 09:56:27 +0100 (CET) Message-ID: <6905166125130c22c244ebf234723d1587a01ae8.camel@huaweicloud.com> Subject: Re: [PATCH v7 2/6] ocfs2: Switch to security_inode_init_security() From: Roberto Sassu To: mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, casey@schaufler-ca.com Cc: ocfs2-devel@oss.oracle.com, reiserfs-devel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kernel@vger.kernel.org, keescook@chromium.org, nicolas.bouchinet@clip-os.org, Roberto Sassu Date: Tue, 10 Jan 2023 09:55:50 +0100 In-Reply-To: <20221201104125.919483-3-roberto.sassu@huaweicloud.com> References: <20221201104125.919483-1-roberto.sassu@huaweicloud.com> <20221201104125.919483-3-roberto.sassu@huaweicloud.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-CM-TRANSID: GxC2BwAH3GIwKL1jw9uDAA--.1874S2 X-Coremail-Antispam: 1UD129KBjvJXoWxKr1UGFWUKw43CFyruw18Grg_yoW7Zw4fpa yftFnxKr1rJFyUuryftw45ua1I9rWrGrZrGrs3K34UZF1DGr1ftryrAr15ua45XrWDJa97 tr4Yyrsxuan8J37anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUkjb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4 vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7Cj xVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8JVWxJwA2z4x0Y4vEx4A2jsIEc7CjxV AFwI0_Gr0_Gr1UM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E x7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x 0Yz7v_Jr0_Gr1lF7xvr2IY64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IYc2Ij 64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x 8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r4a6rW5MIIYrxkI7VAKI48JMIIF0xvE 2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42 xK8VAvwI8IcIk0rVWrZr1j6s0DMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIE c7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07UZ18PUUUUU= X-CM-SenderInfo: purev21wro2thvvxqx5xdzvxpfor3voofrz/1tbiAgANBF1jj4Nm3gAAsB X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org On Thu, 2022-12-01 at 11:41 +0100, Roberto Sassu wrote: > From: Roberto Sassu > > In preparation for removing security_old_inode_init_security(), switch to > security_inode_init_security(). > > Extend the existing ocfs2_initxattrs() to take the > ocfs2_security_xattr_info structure from fs_info, and populate the > name/value/len triple with the first xattr provided by LSMs. Hi Mark, Joel, Joseph some time ago I sent this patch set to switch to the newer function security_inode_init_security(). Almost all the other parts of this patch set have been reviewed, and the patch set itself should be ready to be merged. I kindly ask if you could have a look at this patch and give your Reviewed-by, so that Paul could take the patch set. Thanks a lot! Roberto > As fs_info was not used before, ocfs2_initxattrs() can now handle the case > of replicating the behavior of security_old_inode_init_security(), i.e. > just obtaining the xattr, in addition to setting all xattrs provided by > LSMs. > > Supporting multiple xattrs is not currently supported where > security_old_inode_init_security() was called (mknod, symlink), as it > requires non-trivial changes that can be done at a later time. Like for > reiserfs, even if EVM is invoked, it will not provide an xattr (if it is > not the first to set it, its xattr will be discarded; if it is the first, > it does not have xattrs to calculate the HMAC on). > > Finally, modify the handling of the return value from > ocfs2_init_security_get(). As security_inode_init_security() does not > return -EOPNOTSUPP, remove this case and directly handle the error if the > return value is not zero. > > However, the previous case of receiving -EOPNOTSUPP should be still > taken into account, as security_inode_init_security() could return zero > without setting xattrs and ocfs2 would consider it as if the xattr was set. > > Instead, if security_inode_init_security() returned zero, look at the xattr > if it was set, and behave accordingly, i.e. set si->enable to zero to > notify to the functions following ocfs2_init_security_get() that the xattr > is not available (same as if security_old_inode_init_security() returned > -EOPNOTSUPP). > > Signed-off-by: Roberto Sassu > Reviewed-by: Casey Schaufler > --- > fs/ocfs2/namei.c | 18 ++++++------------ > fs/ocfs2/xattr.c | 30 ++++++++++++++++++++++++++---- > 2 files changed, 32 insertions(+), 16 deletions(-) > > diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c > index 05f32989bad6..55fba81cd2d1 100644 > --- a/fs/ocfs2/namei.c > +++ b/fs/ocfs2/namei.c > @@ -242,6 +242,7 @@ static int ocfs2_mknod(struct user_namespace *mnt_userns, > int want_meta = 0; > int xattr_credits = 0; > struct ocfs2_security_xattr_info si = { > + .name = NULL, > .enable = 1, > }; > int did_quota_inode = 0; > @@ -315,12 +316,8 @@ static int ocfs2_mknod(struct user_namespace *mnt_userns, > /* get security xattr */ > status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); > if (status) { > - if (status == -EOPNOTSUPP) > - si.enable = 0; > - else { > - mlog_errno(status); > - goto leave; > - } > + mlog_errno(status); > + goto leave; > } > > /* calculate meta data/clusters for setting security and acl xattr */ > @@ -1805,6 +1802,7 @@ static int ocfs2_symlink(struct user_namespace *mnt_userns, > int want_clusters = 0; > int xattr_credits = 0; > struct ocfs2_security_xattr_info si = { > + .name = NULL, > .enable = 1, > }; > int did_quota = 0, did_quota_inode = 0; > @@ -1875,12 +1873,8 @@ static int ocfs2_symlink(struct user_namespace *mnt_userns, > /* get security xattr */ > status = ocfs2_init_security_get(inode, dir, &dentry->d_name, &si); > if (status) { > - if (status == -EOPNOTSUPP) > - si.enable = 0; > - else { > - mlog_errno(status); > - goto bail; > - } > + mlog_errno(status); > + goto bail; > } > > /* calculate meta data/clusters for setting security xattr */ > diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c > index 95d0611c5fc7..55699c573541 100644 > --- a/fs/ocfs2/xattr.c > +++ b/fs/ocfs2/xattr.c > @@ -7259,9 +7259,21 @@ static int ocfs2_xattr_security_set(const struct xattr_handler *handler, > static int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, > void *fs_info) > { > + struct ocfs2_security_xattr_info *si = fs_info; > const struct xattr *xattr; > int err = 0; > > + if (si) { > + si->value = kmemdup(xattr_array->value, xattr_array->value_len, > + GFP_KERNEL); > + if (!si->value) > + return -ENOMEM; > + > + si->name = xattr_array->name; > + si->value_len = xattr_array->value_len; > + return 0; > + } > + > for (xattr = xattr_array; xattr->name != NULL; xattr++) { > err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY, > xattr->name, xattr->value, > @@ -7277,13 +7289,23 @@ int ocfs2_init_security_get(struct inode *inode, > const struct qstr *qstr, > struct ocfs2_security_xattr_info *si) > { > + int ret; > + > /* check whether ocfs2 support feature xattr */ > if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb))) > return -EOPNOTSUPP; > - if (si) > - return security_old_inode_init_security(inode, dir, qstr, > - &si->name, &si->value, > - &si->value_len); > + if (si) { > + ret = security_inode_init_security(inode, dir, qstr, > + &ocfs2_initxattrs, si); > + /* > + * security_inode_init_security() does not return -EOPNOTSUPP, > + * we have to check the xattr ourselves. > + */ > + if (!ret && !si->name) > + si->enable = 0; > + > + return ret; > + } > > return security_inode_init_security(inode, dir, qstr, > &ocfs2_initxattrs, NULL);