I thought it would be useful to have a sysctl for disabling the
keyboard reboot sequence. This functionality is currently
available through the SC_DISABLE_REBOOT config option, but it's
convenient to have this capability available at runtime, too.
I can't say I'm much of a kernel hacker, but the attached patch
works fine for me. It applies against 4.3-STABLE, but the same
logic applied to 5.0-CURRENT (which I don't have available for
testing).
Note that investigation revealed that OpenBSD has a similar
sysctl named machdep.kdbreset. I prefer machdep.disable_reboot_key,
but I'm against changing it for feel-good compatibility reasons.
If someone with clue feels there is merit in this, feel free to
commit it.
--
Jon Parise ([EMAIL PROTECTED]) . Rochester Inst. of Technology
http://www.csh.rit.edu/~jon/ : Computer Science House Member
--- syscons.c.orig Sun Oct 29 11:59:27 2000
+++ syscons.c Mon May 21 12:15:57 2001
@@ -118,6 +118,12 @@
SYSCTL_INT(_machdep, OID_AUTO, enable_panic_key, CTLFLAG_RW, &enable_panic_key,
0, "");
+#ifndef SC_DISABLE_REBOOT
+static int disable_reboot_key;
+SYSCTL_INT(_machdep, OID_AUTO, disable_reboot_key, CTLFLAG_RW,
+ &disable_reboot_key, 0, "Disable the reboot key sequence");
+#endif
+
#define SC_CONSOLECTL 255
#define VIRTUAL_TTY(sc, x) (SC_DEV((sc), (x))->si_tty)
@@ -3101,19 +3107,22 @@
case RBT:
#ifndef SC_DISABLE_REBOOT
- shutdown_nice(0);
+ if (!disable_reboot_key)
+ shutdown_nice(0);
#endif
break;
case HALT:
#ifndef SC_DISABLE_REBOOT
- shutdown_nice(RB_HALT);
+ if (!disable_reboot_key)
+ shutdown_nice(RB_HALT);
#endif
break;
case PDWN:
#ifndef SC_DISABLE_REBOOT
- shutdown_nice(RB_HALT|RB_POWEROFF);
+ if (!disable_reboot_key)
+ shutdown_nice(RB_HALT|RB_POWEROFF);
#endif
break;
