apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

security: Define CAP_SYSLOG

Browse Source 
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 <serge.hallyn@ubuntu.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Acked-By: Kees Cook <kees.cook@canonical.com>
Cc: James Morris <jmorris@namei.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: "Christopher J. PeBenito" <cpebenito@tresys.com>
Cc: Eric Paris <eparis@parisplace.org>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Serge E. Hallyn
2010-11-25 17:11:32 +00:00
committed by James Morris
parent 1d6d75684d
commit ce6ada35bd
3 changed files with 13 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/printk.c
+7 -1
View File
@@ -283,8 +283,14 @@ int do_syslog(int type, char __user *buf, int len, bool from_file)
return -EPERM;
if ((type != SYSLOG_ACTION_READ_ALL &&
type != SYSLOG_ACTION_SIZE_BUFFER) &&
!capable(CAP_SYS_ADMIN))
!capable(CAP_SYSLOG)) {
/* remove after 2.6.38 */
if (capable(CAP_SYS_ADMIN))
WARN_ONCE(1, "Attempt to access syslog with "
"CAP_SYS_ADMIN but no CAP_SYSLOG "
"(deprecated and denied).\n");
return -EPERM;
}
}
error = security_syslog(type);