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Removed verbose comment about `securelevel'. It just duplicated part

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of init.8 except for bugs and anachronisms.
This commit is contained in:
Bruce Evans 1996-10-12 15:54:04 +00:00
parent 38058917d5
commit 2dab355e6b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18883
1 changed files with 2 additions and 29 deletions
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31
sys/sys/systm.h
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)systm.h 8.7 (Berkeley) 3/29/95
* $Id: systm.h,v 1.44 1996/09/13 09:20:15 bde Exp $
* $Id: systm.h,v 1.45 1996/09/29 15:00:19 bde Exp $
*/
#ifndef _SYS_SYSTM_H_
@ -44,34 +44,7 @@
#include <machine/cpufunc.h>
/*
* The `securelevel' variable controls the security level of the system.
* It can only be decreased by process 1 (/sbin/init).
*
* Security levels are as follows:
* -1 permanently insecure mode - always run system in level 0 mode.
* 0 insecure mode - immutable and append-only flags make be turned off.
* All devices may be read or written subject to permission modes.
* 1 secure mode - immutable and append-only flags may not be changed;
* raw disks of mounted filesystems, /dev/mem, and /dev/kmem are
* read-only.
* 2 highly secure mode - same as (1) plus raw disks are always
* read-only whether mounted or not. This level precludes tampering
* with filesystems by unmounting them, but also inhibits running
* newfs while the system is secured.
*
* In normal operation, the system runs in level 0 mode while single user
* and in level 1 mode while multiuser. If level 2 mode is desired while
* running multiuser, it can be set in the multiuser startup script
* (/etc/rc.local) using sysctl(1). If it is desired to run the system
* in level 0 mode while multiuser, initialize the variable securelevel
* in /sys/kern/kern_sysctl.c to -1. Note that it is NOT initialized to
* zero as that would allow the kernel binary to be patched to -1.
* Without initialization, securelevel loads in the BSS area which only
* comes into existence when the kernel is loaded and hence cannot be
* patched by a stalking hacker.
*/
extern int securelevel; /* system security level */
extern int securelevel; /* system security level (see init(8)) */
extern int cold; /* nonzero if we are doing a cold boot */
extern const char *panicstr; /* panic message */