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implement support for forced LKM load, which makes the kernel skip

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the version checks, using new -f flag and LMFORCE ioctl

Hopefully the description in the manpage is discouraging enough so that
nobody would dare even _think_ of using forced loads. A warning
message is written to stderr when this is used, just in case.
This commit is contained in:
jdolecek 2003-09-06 19:23:20 +00:00
parent ab4849bbde
commit ade4df3adc
2 changed files with 27 additions and 7 deletions
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14
sbin/modload/modload.8
View File

@ -1,4 +1,4 @@
.\" $NetBSD: modload.8,v 1.23 2003/02/25 10:34:59 wiz Exp $
.\" $NetBSD: modload.8,v 1.24 2003/09/06 19:23:21 jdolecek Exp $
.\"
.\" Copyright (c) 1993 Christopher G. Demetriou
.\" All rights reserved.
@ -32,7 +32,7 @@
.\"
.\" <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
.\"
.Dd April 30, 1999
.Dd September 6, 2003
.Dt MODLOAD 8
.Os
.Sh NAME
@ -40,7 +40,7 @@
.Nd load a kernel module
.Sh SYNOPSIS
.Nm
.Op Fl dnvsS
.Op Fl dfnsSv
.Op Fl A Ar kernel
.Op Fl e Ar entry
.Op Fl p Ar postinstall
@ -62,6 +62,14 @@ Debug.
Used to debug
.Nm
itself.
.It Fl f
This forces load of the module, even if it doesn't match currently
running kernel. When LKM is loaded, kernel normally checks if the LKM
is compatible with the running kernel. This option disables this check.
.Em Note
incompatible LKM can cause system instability, including data loss
or corruption. Don't use this option unless you are sure what you
are doing.
.It Fl n
Do everything, except calling the module entry point (and any
post-install program).

20
sbin/modload/modload.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: modload.c,v 1.40 2003/07/13 07:45:27 itojun Exp $ */
/* $NetBSD: modload.c,v 1.41 2003/09/06 19:23:20 jdolecek Exp $ */
/*
* Copyright (c) 1993 Terrence R. Lambert.
@ -34,7 +34,7 @@
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: modload.c,v 1.40 2003/07/13 07:45:27 itojun Exp $");
__RCSID("$NetBSD: modload.c,v 1.41 2003/09/06 19:23:20 jdolecek Exp $");
#endif /* not lint */
#include <sys/param.h>
@ -69,6 +69,7 @@ __RCSID("$NetBSD: modload.c,v 1.40 2003/07/13 07:45:27 itojun Exp $");
int debug = 0;
int verbose = 0;
u_long force = 0;
char *out = NULL;
int symtab = 0;
int Sflag;
@ -121,7 +122,7 @@ usage(void)
{
fprintf(stderr, "usage:\n");
fprintf(stderr, "modload [-d] [-v] [-n] [-s] [-S] "
fprintf(stderr, "modload [-dfnsSv] "
"[-A <kernel>] [-e <entry>]\n");
fprintf(stderr,
" [-p <postinstall>] [-o <output file>] <input file>\n");
@ -257,11 +258,14 @@ main(int argc, char **argv)
void *modentry; /* XXX */
int noready = 0;
while ((c = getopt(argc, argv, "dnvse:p:o:A:ST:")) != -1) {
while ((c = getopt(argc, argv, "dfnvse:p:o:A:ST:")) != -1) {
switch (c) {
case 'd':
debug = 1;
break; /* debug */
case 'f':
force = 1;
break; /* force load */
case 'v':
verbose = 1;
break; /* verbose */
@ -440,6 +444,14 @@ main(int argc, char **argv)
fileopen |= PART_RESRV;
if (force) {
if (ioctl(devfd, LMFORCE, &force) == -1)
err(10, "can't force load");
warnx("Forced load of LKM '%s'. MAY CAUSE SYSTEM INSTABILITY.",
modout);
}
/*
* Relink at kernel load address
*/