From patchwork Sat Oct 21 13:43:02 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Belouin X-Patchwork-Id: 10021421 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 8C1DF60234 for ; Sat, 21 Oct 2017 14:01:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 73E38285A4 for ; Sat, 21 Oct 2017 14:01:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 680EE28BD5; Sat, 21 Oct 2017 14:01:30 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id A85B1285A4 for ; Sat, 21 Oct 2017 14:01:29 +0000 (UTC) Received: (qmail 12049 invoked by uid 550); 21 Oct 2017 14:01:25 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Delivered-To: moderator for kernel-hardening@lists.openwall.com Received: (qmail 26115 invoked from network); 21 Oct 2017 13:42:59 -0000 From: Nicolas Belouin To: David Howells , "Theodore Ts'o" , Andreas Dilger , Alexander Viro , Serge Hallyn , Paul Moore , Stephen Smalley , Eric Paris , James Morris , linux-cachefs@redhat.com, linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@tycho.nsa.gov, linux-api@vger.kernel.org, kernel-hardening@lists.openwall.com Cc: Nicolas Belouin Date: Sat, 21 Oct 2017 15:43:02 +0200 Message-Id: <20171021134303.20685-1-nicolas@belouin.fr> X-Mailer: git-send-email 2.14.2 X-Antivirus: Dr.Web (R) for Unix mail servers drweb plugin ver.6.0.2.8 X-Antivirus-Code: 0x100000 Subject: [kernel-hardening] [RFC PATCH 1/2] security, capabilities: Add CAP_SYS_MOUNT X-Virus-Scanned: ClamAV using ClamSMTP With CAP_SYS_ADMIN being bloated and inapropriate for actions such as mounting/unmounting filesystems, the creation of a new capability is needed. CAP_SYS_MOUNT is meant to give a process the ability to call for mount, umount and umount2 syscalls. Signed-off-by: Nicolas Belouin --- include/uapi/linux/capability.h | 5 ++++- security/selinux/include/classmap.h | 4 ++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/capability.h b/include/uapi/linux/capability.h index 230e05d35191..ce230aa6d928 100644 --- a/include/uapi/linux/capability.h +++ b/include/uapi/linux/capability.h @@ -365,8 +365,11 @@ struct vfs_ns_cap_data { #define CAP_AUDIT_READ 37 +/* Allow mounting, unmounting filesystems */ -#define CAP_LAST_CAP CAP_AUDIT_READ +#define CAP_SYS_MOUNT 38 + +#define CAP_LAST_CAP CAP_SYS_MOUNT #define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP) diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h index 35ffb29a69cb..a873dce97fd5 100644 --- a/security/selinux/include/classmap.h +++ b/security/selinux/include/classmap.h @@ -24,9 +24,9 @@ "audit_control", "setfcap" #define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \ - "wake_alarm", "block_suspend", "audit_read" + "wake_alarm", "block_suspend", "audit_read", "sys_mount" -#if CAP_LAST_CAP > CAP_AUDIT_READ +#if CAP_LAST_CAP > CAP_SYS_MOUNT #error New capability defined, please update COMMON_CAP2_PERMS. #endif