2 * Kprobe module for testing crash dumps
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 * Copyright (C) IBM Corporation, 2006
20 * Author: Ankita Garg <ankita@in.ibm.com>
22 * This module induces system failures at predefined crashpoints to
23 * evaluate the reliability of crash dumps obtained using different dumping
26 * It is adapted from the Linux Kernel Dump Test Tool by
27 * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
29 * Usage : insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
32 * recur_count : Recursion level for the stack overflow test. Default is 10.
34 * cpoint_name : Crash point where the kernel is to be crashed. It can be
35 * one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
36 * FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
39 * cpoint_type : Indicates the action to be taken on hitting the crash point.
40 * It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW
42 * cpoint_count : Indicates the number of times the crash point is to be hit
43 * to trigger an action. The default is 10.
46 #include <linux/kernel.h>
48 #include <linux/module.h>
49 #include <linux/buffer_head.h>
50 #include <linux/kprobes.h>
51 #include <linux/list.h>
52 #include <linux/init.h>
53 #include <linux/interrupt.h>
54 #include <linux/hrtimer.h>
55 #include <scsi/scsi_cmnd.h>
58 #include <linux/ide.h>
62 #define NUM_CPOINT_TYPES 5
63 #define DEFAULT_COUNT 10
64 #define REC_NUM_DEFAULT 10
87 static char* cp_name
[] = {
98 static char* cp_type
[] = {
106 static struct jprobe lkdtm
;
108 static int lkdtm_parse_commandline(void);
109 static void lkdtm_handler(void);
111 static char* cpoint_name
;
112 static char* cpoint_type
;
113 static int cpoint_count
= DEFAULT_COUNT
;
114 static int recur_count
= REC_NUM_DEFAULT
;
116 static enum cname cpoint
= INVALID
;
117 static enum ctype cptype
= NONE
;
118 static int count
= DEFAULT_COUNT
;
120 module_param(recur_count
, int, 0644);
121 MODULE_PARM_DESC(recur_count
, " Recursion level for the stack overflow test, "\
123 module_param(cpoint_name
, charp
, 0644);
124 MODULE_PARM_DESC(cpoint_name
, " Crash Point, where kernel is to be crashed");
125 module_param(cpoint_type
, charp
, 0644);
126 MODULE_PARM_DESC(cpoint_type
, " Crash Point Type, action to be taken on "\
127 "hitting the crash point");
128 module_param(cpoint_count
, int, 0644);
129 MODULE_PARM_DESC(cpoint_count
, " Crash Point Count, number of times the "\
130 "crash point is to be hit to trigger action");
132 static unsigned int jp_do_irq(unsigned int irq
)
139 static irqreturn_t
jp_handle_irq_event(unsigned int irq
,
140 struct irqaction
*action
)
147 static void jp_tasklet_action(struct softirq_action
*a
)
153 static void jp_ll_rw_block(int rw
, int nr
, struct buffer_head
*bhs
[])
161 static unsigned long jp_shrink_inactive_list(unsigned long max_scan
,
163 struct scan_control
*sc
)
170 static int jp_hrtimer_start(struct hrtimer
*timer
, ktime_t tim
,
171 const enum hrtimer_mode mode
)
178 static int jp_scsi_dispatch_cmd(struct scsi_cmnd
*cmd
)
186 int jp_generic_ide_ioctl(ide_drive_t
*drive
, struct file
*file
,
187 struct block_device
*bdev
, unsigned int cmd
,
196 static int lkdtm_parse_commandline(void)
200 if (cpoint_name
== NULL
|| cpoint_type
== NULL
||
201 cpoint_count
< 1 || recur_count
< 1)
204 for (i
= 0; i
< NUM_CPOINTS
; ++i
) {
205 if (!strcmp(cpoint_name
, cp_name
[i
])) {
211 for (i
= 0; i
< NUM_CPOINT_TYPES
; ++i
) {
212 if (!strcmp(cpoint_type
, cp_type
[i
])) {
218 if (cpoint
== INVALID
|| cptype
== NONE
)
221 count
= cpoint_count
;
226 static int recursive_loop(int a
)
230 memset(buf
,0xFF,1024);
235 return recursive_loop(a
);
238 void lkdtm_handler(void)
240 printk(KERN_INFO
"lkdtm : Crash point %s of type %s hit\n",
241 cpoint_name
, cpoint_type
);
249 printk(KERN_INFO
"lkdtm : PANIC\n");
253 printk(KERN_INFO
"lkdtm : BUG\n");
257 printk(KERN_INFO
"lkdtm : EXCEPTION\n");
261 printk(KERN_INFO
"lkdtm : LOOP\n");
265 printk(KERN_INFO
"lkdtm : OVERFLOW\n");
266 (void) recursive_loop(0);
271 count
= cpoint_count
;
275 static int __init
lkdtm_module_init(void)
279 if (lkdtm_parse_commandline() == -EINVAL
) {
280 printk(KERN_INFO
"lkdtm : Invalid command\n");
285 case INT_HARDWARE_ENTRY
:
286 lkdtm
.kp
.symbol_name
= "__do_IRQ";
287 lkdtm
.entry
= (kprobe_opcode_t
*) jp_do_irq
;
290 lkdtm
.kp
.symbol_name
= "handle_IRQ_event";
291 lkdtm
.entry
= (kprobe_opcode_t
*) jp_handle_irq_event
;
293 case INT_TASKLET_ENTRY
:
294 lkdtm
.kp
.symbol_name
= "tasklet_action";
295 lkdtm
.entry
= (kprobe_opcode_t
*) jp_tasklet_action
;
298 lkdtm
.kp
.symbol_name
= "ll_rw_block";
299 lkdtm
.entry
= (kprobe_opcode_t
*) jp_ll_rw_block
;
302 lkdtm
.kp
.symbol_name
= "shrink_inactive_list";
303 lkdtm
.entry
= (kprobe_opcode_t
*) jp_shrink_inactive_list
;
306 lkdtm
.kp
.symbol_name
= "hrtimer_start";
307 lkdtm
.entry
= (kprobe_opcode_t
*) jp_hrtimer_start
;
309 case SCSI_DISPATCH_CMD
:
310 lkdtm
.kp
.symbol_name
= "scsi_dispatch_cmd";
311 lkdtm
.entry
= (kprobe_opcode_t
*) jp_scsi_dispatch_cmd
;
315 lkdtm
.kp
.symbol_name
= "generic_ide_ioctl";
316 lkdtm
.entry
= (kprobe_opcode_t
*) jp_generic_ide_ioctl
;
318 printk(KERN_INFO
"lkdtm : Crash point not available\n");
322 printk(KERN_INFO
"lkdtm : Invalid Crash Point\n");
326 if ((ret
= register_jprobe(&lkdtm
)) < 0) {
327 printk(KERN_INFO
"lkdtm : Couldn't register jprobe\n");
331 printk(KERN_INFO
"lkdtm : Crash point %s of type %s registered\n",
332 cpoint_name
, cpoint_type
);
336 static void __exit
lkdtm_module_exit(void)
338 unregister_jprobe(&lkdtm
);
339 printk(KERN_INFO
"lkdtm : Crash point unregistered\n");
342 module_init(lkdtm_module_init
);
343 module_exit(lkdtm_module_exit
);
345 MODULE_LICENSE("GPL");
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