security: Define CAP_SYSLOG

security: Define CAP_SYSLOG

Privileged syslog operations currently require CAP_SYS_ADMIN.  Split
this off into a new CAP_SYSLOG privilege which we can sanely take away
from a container through the capability bounding set.

With this patch, an lxc container can be prevented from messing with
the host's syslog (i.e. dmesg -c).

Changelog: mar 12 2010: add selinux capability2:cap_syslog perm
Changelog: nov 22 2010:
	. port to new kernel
	. add a WARN_ONCE if userspace isn't using CAP_SYSLOG

Signed-off-by: Serge Hallyn <[email protected]>
Acked-by: Andrew G. Morgan <[email protected]>
Acked-By: Kees Cook <[email protected]>
Cc: James Morris <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: "Christopher J. PeBenito" <[email protected]>
Cc: Eric Paris <[email protected]>
Signed-off-by: James Morris <[email protected]>