From patchwork Wed Jul 6 18:12:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Eric W. Biederman" X-Patchwork-Id: 9216829 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0930D60752 for ; Wed, 6 Jul 2016 18:25:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F314228335 for ; Wed, 6 Jul 2016 18:25:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E7A8E28338; Wed, 6 Jul 2016 18:25:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4EF6D28339 for ; Wed, 6 Jul 2016 18:25:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755712AbcGFSZF (ORCPT ); Wed, 6 Jul 2016 14:25:05 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:33505 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755253AbcGFSY7 (ORCPT ); Wed, 6 Jul 2016 14:24:59 -0400 Received: from in01.mta.xmission.com ([166.70.13.51]) by out01.mta.xmission.com with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1bKrVL-0000DD-5B; Wed, 06 Jul 2016 12:24:59 -0600 Received: from 67-3-204-119.omah.qwest.net ([67.3.204.119] helo=x220.int.ebiederm.org) by in01.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.87) (envelope-from ) id 1bKrVK-00055P-Bw; Wed, 06 Jul 2016 12:24:59 -0600 From: "Eric W. Biederman" To: Linux Containers Cc: Seth Forshee , linux-fsdevel@vger.kernel.org, Linux API , James Bottomley , Djalal Harouni , "Serge E. Hallyn" , Andy Lutomirski , Jan Kara , Jann Horn , Michael Kerrisk Date: Wed, 6 Jul 2016 13:12:03 -0500 Message-Id: <20160706181212.16267-3-ebiederm@xmission.com> X-Mailer: git-send-email 2.8.3 In-Reply-To: <20160706181212.16267-1-ebiederm@xmission.com> References: <874m82bptc.fsf@x220.int.ebiederm.org> <20160706181212.16267-1-ebiederm@xmission.com> X-XM-SPF: eid=1bKrVK-00055P-Bw; ; ; mid=<20160706181212.16267-3-ebiederm@xmission.com>; ; ; hst=in01.mta.xmission.com; ; ; ip=67.3.204.119; ; ; frm=ebiederm@xmission.com; ; ; spf=neutral X-XM-AID: U2FsdGVkX1+dQ3v9x14S0Rh7j7yzkZDtN/9NM9+daFQ= X-SA-Exim-Connect-IP: 67.3.204.119 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: [PATCH review 03/12] vfs: Verify acls are valid within superblock's s_user_ns. X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in01.mta.xmission.com) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Update posix_acl_valid to verify that an acl is within a user namespace. Update the callers of posix_acl_valid to pass in an appropriate user namespace. For posix_acl_xattr_set and v9fs_xattr_set_acl pass in inode->i_sb->s_user_ns to posix_acl_valid. For md_unpack_acl pass in &init_user_ns as no inode or superblock is in sight. Acked-by: Seth Forshee Signed-off-by: "Eric W. Biederman" --- drivers/staging/lustre/lustre/mdc/mdc_request.c | 2 +- fs/9p/acl.c | 2 +- fs/posix_acl.c | 8 ++++---- include/linux/posix_acl.h | 2 +- 4 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/staging/lustre/lustre/mdc/mdc_request.c b/drivers/staging/lustre/lustre/mdc/mdc_request.c index 86b7445365f4..40cf57fad581 100644 --- a/drivers/staging/lustre/lustre/mdc/mdc_request.c +++ b/drivers/staging/lustre/lustre/mdc/mdc_request.c @@ -434,7 +434,7 @@ static int mdc_unpack_acl(struct ptlrpc_request *req, struct lustre_md *md) return rc; } - rc = posix_acl_valid(acl); + rc = posix_acl_valid(&init_user_ns, acl); if (rc) { CERROR("validate acl: %d\n", rc); posix_acl_release(acl); diff --git a/fs/9p/acl.c b/fs/9p/acl.c index 0576eaeb60b9..5b6a1743ea17 100644 --- a/fs/9p/acl.c +++ b/fs/9p/acl.c @@ -266,7 +266,7 @@ static int v9fs_xattr_set_acl(const struct xattr_handler *handler, if (IS_ERR(acl)) return PTR_ERR(acl); else if (acl) { - retval = posix_acl_valid(acl); + retval = posix_acl_valid(inode->i_sb->s_user_ns, acl); if (retval) goto err_out; } diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 8a4a266beff3..647c28180675 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -205,7 +205,7 @@ posix_acl_clone(const struct posix_acl *acl, gfp_t flags) * Check if an acl is valid. Returns 0 if it is, or -E... otherwise. */ int -posix_acl_valid(const struct posix_acl *acl) +posix_acl_valid(struct user_namespace *user_ns, const struct posix_acl *acl) { const struct posix_acl_entry *pa, *pe; int state = ACL_USER_OBJ; @@ -225,7 +225,7 @@ posix_acl_valid(const struct posix_acl *acl) case ACL_USER: if (state != ACL_USER) return -EINVAL; - if (!uid_valid(pa->e_uid)) + if (!kuid_has_mapping(user_ns, pa->e_uid)) return -EINVAL; needs_mask = 1; break; @@ -240,7 +240,7 @@ posix_acl_valid(const struct posix_acl *acl) case ACL_GROUP: if (state != ACL_GROUP) return -EINVAL; - if (!gid_valid(pa->e_gid)) + if (!kgid_has_mapping(user_ns, pa->e_gid)) return -EINVAL; needs_mask = 1; break; @@ -845,7 +845,7 @@ posix_acl_xattr_set(const struct xattr_handler *handler, return PTR_ERR(acl); if (acl) { - ret = posix_acl_valid(acl); + ret = posix_acl_valid(inode->i_sb->s_user_ns, acl); if (ret) goto out; } diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h index 5b5a80cc5926..1af6438fde3e 100644 --- a/include/linux/posix_acl.h +++ b/include/linux/posix_acl.h @@ -81,7 +81,7 @@ posix_acl_release(struct posix_acl *acl) extern void posix_acl_init(struct posix_acl *, int); extern struct posix_acl *posix_acl_alloc(int, gfp_t); -extern int posix_acl_valid(const struct posix_acl *); +extern int posix_acl_valid(struct user_namespace *, const struct posix_acl *); extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *);