From: Nicolas Belouin Subject: [RFC PATCH 1/2] security, capabilities: Add CAP_SYS_MOUNT Date: Sat, 21 Oct 2017 15:43:02 +0200 Message-ID: <20171021134303.20685-1-nicolas@belouin.fr> Cc: 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 Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org 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 -- 2.14.2