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Ankita Garg8bb31b92006-10-02 02:17:36 -07001/*
2 * Kprobe module for testing crash dumps
3 *
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.
8 *
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.
13 *
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.
17 *
18 * Copyright (C) IBM Corporation, 2006
19 *
20 * Author: Ankita Garg <ankita@in.ibm.com>
21 *
22 * This module induces system failures at predefined crashpoints to
23 * evaluate the reliability of crash dumps obtained using different dumping
24 * solutions.
25 *
26 * It is adapted from the Linux Kernel Dump Test Tool by
27 * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
28 *
29 * Usage : insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
30 * [cpoint_count={>0}]
31 *
32 * recur_count : Recursion level for the stack overflow test. Default is 10.
33 *
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,
37 * IDE_CORE_CP
38 *
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
41 *
42 * cpoint_count : Indicates the number of times the crash point is to be hit
43 * to trigger an action. The default is 10.
44 */
45
46#include <linux/kernel.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080047#include <linux/fs.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070048#include <linux/module.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080049#include <linux/buffer_head.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070050#include <linux/kprobes.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080051#include <linux/list.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070052#include <linux/init.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070053#include <linux/interrupt.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080054#include <linux/hrtimer.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070055#include <scsi/scsi_cmnd.h>
56
57#ifdef CONFIG_IDE
58#include <linux/ide.h>
59#endif
60
61#define NUM_CPOINTS 8
62#define NUM_CPOINT_TYPES 5
63#define DEFAULT_COUNT 10
64#define REC_NUM_DEFAULT 10
65
66enum cname {
67 INVALID,
68 INT_HARDWARE_ENTRY,
69 INT_HW_IRQ_EN,
70 INT_TASKLET_ENTRY,
71 FS_DEVRW,
72 MEM_SWAPOUT,
73 TIMERADD,
74 SCSI_DISPATCH_CMD,
75 IDE_CORE_CP
76};
77
78enum ctype {
79 NONE,
80 PANIC,
81 BUG,
82 EXCEPTION,
83 LOOP,
84 OVERFLOW
85};
86
87static char* cp_name[] = {
88 "INT_HARDWARE_ENTRY",
89 "INT_HW_IRQ_EN",
90 "INT_TASKLET_ENTRY",
91 "FS_DEVRW",
92 "MEM_SWAPOUT",
93 "TIMERADD",
94 "SCSI_DISPATCH_CMD",
95 "IDE_CORE_CP"
96};
97
98static char* cp_type[] = {
99 "PANIC",
100 "BUG",
101 "EXCEPTION",
102 "LOOP",
103 "OVERFLOW"
104};
105
106static struct jprobe lkdtm;
107
108static int lkdtm_parse_commandline(void);
109static void lkdtm_handler(void);
110
Al Viroec1c6202007-02-09 16:05:17 +0000111static char* cpoint_name;
112static char* cpoint_type;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700113static int cpoint_count = DEFAULT_COUNT;
114static int recur_count = REC_NUM_DEFAULT;
115
116static enum cname cpoint = INVALID;
117static enum ctype cptype = NONE;
118static int count = DEFAULT_COUNT;
119
120module_param(recur_count, int, 0644);
Randy Dunlap5d861d92006-11-02 22:07:06 -0800121MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\
122 "default is 10");
Ankita Garg8bb31b92006-10-02 02:17:36 -0700123module_param(cpoint_name, charp, 0644);
Randy Dunlap5d861d92006-11-02 22:07:06 -0800124MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
125module_param(cpoint_type, charp, 0644);
126MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
127 "hitting the crash point");
128module_param(cpoint_count, int, 0644);
129MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
130 "crash point is to be hit to trigger action");
Ankita Garg8bb31b92006-10-02 02:17:36 -0700131
David Howells7d12e782006-10-05 14:55:46 +0100132unsigned int jp_do_irq(unsigned int irq)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700133{
134 lkdtm_handler();
135 jprobe_return();
136 return 0;
137}
138
David Howells7d12e782006-10-05 14:55:46 +0100139irqreturn_t jp_handle_irq_event(unsigned int irq, struct irqaction *action)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700140{
141 lkdtm_handler();
142 jprobe_return();
143 return 0;
144}
145
146void jp_tasklet_action(struct softirq_action *a)
147{
148 lkdtm_handler();
149 jprobe_return();
150}
151
152void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
153{
154 lkdtm_handler();
155 jprobe_return();
156}
157
158struct scan_control;
159
Ankita Garg18a61e42006-11-05 23:52:07 -0800160unsigned long jp_shrink_inactive_list(unsigned long max_scan,
161 struct zone *zone, struct scan_control *sc)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700162{
163 lkdtm_handler();
164 jprobe_return();
165 return 0;
166}
167
168int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
169 const enum hrtimer_mode mode)
170{
171 lkdtm_handler();
172 jprobe_return();
173 return 0;
174}
175
176int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
177{
178 lkdtm_handler();
179 jprobe_return();
180 return 0;
181}
182
183#ifdef CONFIG_IDE
184int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
185 struct block_device *bdev, unsigned int cmd,
186 unsigned long arg)
187{
188 lkdtm_handler();
189 jprobe_return();
190 return 0;
191}
192#endif
193
194static int lkdtm_parse_commandline(void)
195{
196 int i;
197
198 if (cpoint_name == INVALID || cpoint_type == NONE ||
199 cpoint_count < 1 || recur_count < 1)
200 return -EINVAL;
201
202 for (i = 0; i < NUM_CPOINTS; ++i) {
203 if (!strcmp(cpoint_name, cp_name[i])) {
204 cpoint = i + 1;
205 break;
206 }
207 }
208
209 for (i = 0; i < NUM_CPOINT_TYPES; ++i) {
210 if (!strcmp(cpoint_type, cp_type[i])) {
211 cptype = i + 1;
212 break;
213 }
214 }
215
216 if (cpoint == INVALID || cptype == NONE)
217 return -EINVAL;
218
219 count = cpoint_count;
220
221 return 0;
222}
223
224static int recursive_loop(int a)
225{
226 char buf[1024];
227
228 memset(buf,0xFF,1024);
229 recur_count--;
230 if (!recur_count)
231 return 0;
232 else
233 return recursive_loop(a);
234}
235
236void lkdtm_handler(void)
237{
238 printk(KERN_INFO "lkdtm : Crash point %s of type %s hit\n",
239 cpoint_name, cpoint_type);
240 --count;
241
242 if (count == 0) {
243 switch (cptype) {
244 case NONE:
245 break;
246 case PANIC:
247 printk(KERN_INFO "lkdtm : PANIC\n");
248 panic("dumptest");
249 break;
250 case BUG:
251 printk(KERN_INFO "lkdtm : BUG\n");
252 BUG();
253 break;
254 case EXCEPTION:
255 printk(KERN_INFO "lkdtm : EXCEPTION\n");
256 *((int *) 0) = 0;
257 break;
258 case LOOP:
259 printk(KERN_INFO "lkdtm : LOOP\n");
260 for (;;);
261 break;
262 case OVERFLOW:
263 printk(KERN_INFO "lkdtm : OVERFLOW\n");
264 (void) recursive_loop(0);
265 break;
266 default:
267 break;
268 }
269 count = cpoint_count;
270 }
271}
272
273int lkdtm_module_init(void)
274{
275 int ret;
276
277 if (lkdtm_parse_commandline() == -EINVAL) {
278 printk(KERN_INFO "lkdtm : Invalid command\n");
279 return -EINVAL;
280 }
281
282 switch (cpoint) {
283 case INT_HARDWARE_ENTRY:
284 lkdtm.kp.symbol_name = "__do_IRQ";
285 lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
286 break;
287 case INT_HW_IRQ_EN:
288 lkdtm.kp.symbol_name = "handle_IRQ_event";
289 lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
290 break;
291 case INT_TASKLET_ENTRY:
292 lkdtm.kp.symbol_name = "tasklet_action";
293 lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
294 break;
295 case FS_DEVRW:
296 lkdtm.kp.symbol_name = "ll_rw_block";
297 lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
298 break;
299 case MEM_SWAPOUT:
Ankita Garg18a61e42006-11-05 23:52:07 -0800300 lkdtm.kp.symbol_name = "shrink_inactive_list";
301 lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700302 break;
303 case TIMERADD:
304 lkdtm.kp.symbol_name = "hrtimer_start";
305 lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
306 break;
307 case SCSI_DISPATCH_CMD:
308 lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
309 lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
310 break;
311 case IDE_CORE_CP:
312#ifdef CONFIG_IDE
313 lkdtm.kp.symbol_name = "generic_ide_ioctl";
314 lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;
315#else
316 printk(KERN_INFO "lkdtm : Crash point not available\n");
317#endif
318 break;
319 default:
320 printk(KERN_INFO "lkdtm : Invalid Crash Point\n");
321 break;
322 }
323
324 if ((ret = register_jprobe(&lkdtm)) < 0) {
325 printk(KERN_INFO "lkdtm : Couldn't register jprobe\n");
326 return ret;
327 }
328
329 printk(KERN_INFO "lkdtm : Crash point %s of type %s registered\n",
330 cpoint_name, cpoint_type);
331 return 0;
332}
333
334void lkdtm_module_exit(void)
335{
336 unregister_jprobe(&lkdtm);
337 printk(KERN_INFO "lkdtm : Crash point unregistered\n");
338}
339
340module_init(lkdtm_module_init);
341module_exit(lkdtm_module_exit);
342
343MODULE_LICENSE("GPL");