From 002345925e6c45861f60db6f4fc6236713fd8847 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 3 Feb 2010 15:36:43 -0800 Subject: syslog: distinguish between /proc/kmsg and syscalls This allows the LSM to distinguish between syslog functions originating from /proc/kmsg access and direct syscalls. By default, the commoncaps will now no longer require CAP_SYS_ADMIN to read an opened /proc/kmsg file descriptor. For example the kernel syslog reader can now drop privileges after opening /proc/kmsg, instead of staying privileged with CAP_SYS_ADMIN. MAC systems that implement security_syslog have unchanged behavior. Signed-off-by: Kees Cook Acked-by: Serge Hallyn Acked-by: John Johansen Signed-off-by: James Morris --- include/linux/syslog.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 include/linux/syslog.h (limited to 'include/linux/syslog.h') diff --git a/include/linux/syslog.h b/include/linux/syslog.h new file mode 100644 index 00000000000..5f02b1817be --- /dev/null +++ b/include/linux/syslog.h @@ -0,0 +1,29 @@ +/* Syslog internals + * + * Copyright 2010 Canonical, Ltd. + * Author: Kees Cook + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#ifndef _LINUX_SYSLOG_H +#define _LINUX_SYSLOG_H + +#define SYSLOG_FROM_CALL 0 +#define SYSLOG_FROM_FILE 1 + +int do_syslog(int type, char __user *buf, int count, bool from_file); + +#endif /* _LINUX_SYSLOG_H */ -- cgit v1.2.3