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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 *
Simon Kagstrom0347af42010-03-05 13:42:49 -080029 * Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net>
Ankita Garg8bb31b92006-10-02 02:17:36 -070030 *
Simon Kagstrom0347af42010-03-05 13:42:49 -080031 * See Documentation/fault-injection/provoke-crashes.txt for instructions
Ankita Garg8bb31b92006-10-02 02:17:36 -070032 */
33
34#include <linux/kernel.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080035#include <linux/fs.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070036#include <linux/module.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080037#include <linux/buffer_head.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070038#include <linux/kprobes.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080039#include <linux/list.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070040#include <linux/init.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070041#include <linux/interrupt.h>
Randy Dunlap5d861d92006-11-02 22:07:06 -080042#include <linux/hrtimer.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090043#include <linux/slab.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070044#include <scsi/scsi_cmnd.h>
Simon Kagstrom0347af42010-03-05 13:42:49 -080045#include <linux/debugfs.h>
Ankita Garg8bb31b92006-10-02 02:17:36 -070046
47#ifdef CONFIG_IDE
48#include <linux/ide.h>
49#endif
50
Ankita Garg8bb31b92006-10-02 02:17:36 -070051#define DEFAULT_COUNT 10
52#define REC_NUM_DEFAULT 10
53
54enum cname {
55 INVALID,
56 INT_HARDWARE_ENTRY,
57 INT_HW_IRQ_EN,
58 INT_TASKLET_ENTRY,
59 FS_DEVRW,
60 MEM_SWAPOUT,
61 TIMERADD,
62 SCSI_DISPATCH_CMD,
Simon Kagstrom0347af42010-03-05 13:42:49 -080063 IDE_CORE_CP,
64 DIRECT,
Ankita Garg8bb31b92006-10-02 02:17:36 -070065};
66
67enum ctype {
68 NONE,
69 PANIC,
70 BUG,
71 EXCEPTION,
72 LOOP,
Simon Kagstrom0347af42010-03-05 13:42:49 -080073 OVERFLOW,
74 CORRUPT_STACK,
75 UNALIGNED_LOAD_STORE_WRITE,
76 OVERWRITE_ALLOCATION,
77 WRITE_AFTER_FREE,
Frederic Weisbeckera48223f2010-05-26 14:44:29 -070078 SOFTLOCKUP,
79 HARDLOCKUP,
80 HUNG_TASK,
Ankita Garg8bb31b92006-10-02 02:17:36 -070081};
82
83static char* cp_name[] = {
84 "INT_HARDWARE_ENTRY",
85 "INT_HW_IRQ_EN",
86 "INT_TASKLET_ENTRY",
87 "FS_DEVRW",
88 "MEM_SWAPOUT",
89 "TIMERADD",
90 "SCSI_DISPATCH_CMD",
Simon Kagstrom0347af42010-03-05 13:42:49 -080091 "IDE_CORE_CP",
92 "DIRECT",
Ankita Garg8bb31b92006-10-02 02:17:36 -070093};
94
95static char* cp_type[] = {
96 "PANIC",
97 "BUG",
98 "EXCEPTION",
99 "LOOP",
Simon Kagstrom0347af42010-03-05 13:42:49 -0800100 "OVERFLOW",
101 "CORRUPT_STACK",
102 "UNALIGNED_LOAD_STORE_WRITE",
103 "OVERWRITE_ALLOCATION",
104 "WRITE_AFTER_FREE",
Frederic Weisbeckera48223f2010-05-26 14:44:29 -0700105 "SOFTLOCKUP",
106 "HARDLOCKUP",
107 "HUNG_TASK",
Ankita Garg8bb31b92006-10-02 02:17:36 -0700108};
109
110static struct jprobe lkdtm;
111
112static int lkdtm_parse_commandline(void);
113static void lkdtm_handler(void);
114
Al Viroec1c6202007-02-09 16:05:17 +0000115static char* cpoint_name;
116static char* cpoint_type;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700117static int cpoint_count = DEFAULT_COUNT;
118static int recur_count = REC_NUM_DEFAULT;
119
120static enum cname cpoint = INVALID;
121static enum ctype cptype = NONE;
122static int count = DEFAULT_COUNT;
123
124module_param(recur_count, int, 0644);
Randy Dunlap5d861d92006-11-02 22:07:06 -0800125MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\
126 "default is 10");
Rusty Russelldca41302010-08-11 23:04:21 -0600127module_param(cpoint_name, charp, 0444);
Randy Dunlap5d861d92006-11-02 22:07:06 -0800128MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
Rusty Russelldca41302010-08-11 23:04:21 -0600129module_param(cpoint_type, charp, 0444);
Randy Dunlap5d861d92006-11-02 22:07:06 -0800130MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
131 "hitting the crash point");
132module_param(cpoint_count, int, 0644);
133MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
134 "crash point is to be hit to trigger action");
Ankita Garg8bb31b92006-10-02 02:17:36 -0700135
Adrian Bunk21181162008-02-06 01:36:50 -0800136static unsigned int jp_do_irq(unsigned int irq)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700137{
138 lkdtm_handler();
139 jprobe_return();
140 return 0;
141}
142
Adrian Bunk21181162008-02-06 01:36:50 -0800143static irqreturn_t jp_handle_irq_event(unsigned int irq,
144 struct irqaction *action)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700145{
146 lkdtm_handler();
147 jprobe_return();
148 return 0;
149}
150
Adrian Bunk21181162008-02-06 01:36:50 -0800151static void jp_tasklet_action(struct softirq_action *a)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700152{
153 lkdtm_handler();
154 jprobe_return();
155}
156
Adrian Bunk21181162008-02-06 01:36:50 -0800157static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
Ankita Garg8bb31b92006-10-02 02:17:36 -0700158{
159 lkdtm_handler();
160 jprobe_return();
161}
162
163struct scan_control;
164
Adrian Bunk21181162008-02-06 01:36:50 -0800165static unsigned long jp_shrink_inactive_list(unsigned long max_scan,
166 struct zone *zone,
167 struct scan_control *sc)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700168{
169 lkdtm_handler();
170 jprobe_return();
171 return 0;
172}
173
Adrian Bunk21181162008-02-06 01:36:50 -0800174static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
175 const enum hrtimer_mode mode)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700176{
177 lkdtm_handler();
178 jprobe_return();
179 return 0;
180}
181
Adrian Bunk21181162008-02-06 01:36:50 -0800182static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700183{
184 lkdtm_handler();
185 jprobe_return();
186 return 0;
187}
188
189#ifdef CONFIG_IDE
190int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
191 struct block_device *bdev, unsigned int cmd,
192 unsigned long arg)
193{
194 lkdtm_handler();
195 jprobe_return();
196 return 0;
197}
198#endif
199
Simon Kagstrom0347af42010-03-05 13:42:49 -0800200/* Return the crashpoint number or NONE if the name is invalid */
201static enum ctype parse_cp_type(const char *what, size_t count)
202{
203 int i;
204
205 for (i = 0; i < ARRAY_SIZE(cp_type); i++) {
206 if (!strcmp(what, cp_type[i]))
207 return i + 1;
208 }
209
210 return NONE;
211}
212
213static const char *cp_type_to_str(enum ctype type)
214{
215 if (type == NONE || type < 0 || type > ARRAY_SIZE(cp_type))
216 return "None";
217
218 return cp_type[type - 1];
219}
220
221static const char *cp_name_to_str(enum cname name)
222{
223 if (name == INVALID || name < 0 || name > ARRAY_SIZE(cp_name))
224 return "INVALID";
225
226 return cp_name[name - 1];
227}
228
229
Ankita Garg8bb31b92006-10-02 02:17:36 -0700230static int lkdtm_parse_commandline(void)
231{
232 int i;
233
Simon Kagstrom0347af42010-03-05 13:42:49 -0800234 if (cpoint_count < 1 || recur_count < 1)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700235 return -EINVAL;
236
Ankita Garg8bb31b92006-10-02 02:17:36 -0700237 count = cpoint_count;
238
Simon Kagstrom0347af42010-03-05 13:42:49 -0800239 /* No special parameters */
240 if (!cpoint_type && !cpoint_name)
241 return 0;
242
243 /* Neither or both of these need to be set */
244 if (!cpoint_type || !cpoint_name)
245 return -EINVAL;
246
247 cptype = parse_cp_type(cpoint_type, strlen(cpoint_type));
248 if (cptype == NONE)
249 return -EINVAL;
250
251 for (i = 0; i < ARRAY_SIZE(cp_name); i++) {
252 if (!strcmp(cpoint_name, cp_name[i])) {
253 cpoint = i + 1;
254 return 0;
255 }
256 }
257
258 /* Could not find a valid crash point */
259 return -EINVAL;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700260}
261
262static int recursive_loop(int a)
263{
264 char buf[1024];
265
266 memset(buf,0xFF,1024);
267 recur_count--;
268 if (!recur_count)
269 return 0;
270 else
271 return recursive_loop(a);
272}
273
Simon Kagstrom0347af42010-03-05 13:42:49 -0800274static void lkdtm_do_action(enum ctype which)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700275{
Simon Kagstrom0347af42010-03-05 13:42:49 -0800276 switch (which) {
277 case PANIC:
278 panic("dumptest");
279 break;
280 case BUG:
281 BUG();
282 break;
283 case EXCEPTION:
284 *((int *) 0) = 0;
285 break;
286 case LOOP:
287 for (;;)
288 ;
289 break;
290 case OVERFLOW:
291 (void) recursive_loop(0);
292 break;
293 case CORRUPT_STACK: {
294 volatile u32 data[8];
295 volatile u32 *p = data;
296
297 p[12] = 0x12345678;
298 break;
299 }
300 case UNALIGNED_LOAD_STORE_WRITE: {
301 static u8 data[5] __attribute__((aligned(4))) = {1, 2,
302 3, 4, 5};
303 u32 *p;
304 u32 val = 0x12345678;
305
306 p = (u32 *)(data + 1);
307 if (*p == 0)
308 val = 0x87654321;
309 *p = val;
310 break;
311 }
312 case OVERWRITE_ALLOCATION: {
313 size_t len = 1020;
314 u32 *data = kmalloc(len, GFP_KERNEL);
315
316 data[1024 / sizeof(u32)] = 0x12345678;
317 kfree(data);
318 break;
319 }
320 case WRITE_AFTER_FREE: {
321 size_t len = 1024;
322 u32 *data = kmalloc(len, GFP_KERNEL);
323
324 kfree(data);
325 schedule();
326 memset(data, 0x78, len);
327 break;
328 }
Frederic Weisbeckera48223f2010-05-26 14:44:29 -0700329 case SOFTLOCKUP:
330 preempt_disable();
331 for (;;)
332 cpu_relax();
333 break;
334 case HARDLOCKUP:
335 local_irq_disable();
336 for (;;)
337 cpu_relax();
338 break;
339 case HUNG_TASK:
340 set_current_state(TASK_UNINTERRUPTIBLE);
341 schedule();
342 break;
Simon Kagstrom0347af42010-03-05 13:42:49 -0800343 case NONE:
344 default:
345 break;
346 }
347
348}
349
350static void lkdtm_handler(void)
351{
352 count--;
353 printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n",
354 cp_name_to_str(cpoint), cp_type_to_str(cptype), count);
Ankita Garg8bb31b92006-10-02 02:17:36 -0700355
356 if (count == 0) {
Simon Kagstrom0347af42010-03-05 13:42:49 -0800357 lkdtm_do_action(cptype);
Ankita Garg8bb31b92006-10-02 02:17:36 -0700358 count = cpoint_count;
359 }
360}
361
Simon Kagstrom0347af42010-03-05 13:42:49 -0800362static int lkdtm_register_cpoint(enum cname which)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700363{
364 int ret;
365
Simon Kagstrom0347af42010-03-05 13:42:49 -0800366 cpoint = INVALID;
367 if (lkdtm.entry != NULL)
368 unregister_jprobe(&lkdtm);
Ankita Garg8bb31b92006-10-02 02:17:36 -0700369
Simon Kagstrom0347af42010-03-05 13:42:49 -0800370 switch (which) {
371 case DIRECT:
372 lkdtm_do_action(cptype);
373 return 0;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700374 case INT_HARDWARE_ENTRY:
M. Mohan Kumarf58f2fa2009-09-22 16:43:29 -0700375 lkdtm.kp.symbol_name = "do_IRQ";
Ankita Garg8bb31b92006-10-02 02:17:36 -0700376 lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
377 break;
378 case INT_HW_IRQ_EN:
379 lkdtm.kp.symbol_name = "handle_IRQ_event";
380 lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
381 break;
382 case INT_TASKLET_ENTRY:
383 lkdtm.kp.symbol_name = "tasklet_action";
384 lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
385 break;
386 case FS_DEVRW:
387 lkdtm.kp.symbol_name = "ll_rw_block";
388 lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
389 break;
390 case MEM_SWAPOUT:
Ankita Garg18a61e42006-11-05 23:52:07 -0800391 lkdtm.kp.symbol_name = "shrink_inactive_list";
392 lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700393 break;
394 case TIMERADD:
395 lkdtm.kp.symbol_name = "hrtimer_start";
396 lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
397 break;
398 case SCSI_DISPATCH_CMD:
399 lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
400 lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
401 break;
402 case IDE_CORE_CP:
403#ifdef CONFIG_IDE
404 lkdtm.kp.symbol_name = "generic_ide_ioctl";
405 lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;
406#else
Simon Kagstrom0347af42010-03-05 13:42:49 -0800407 printk(KERN_INFO "lkdtm: Crash point not available\n");
408 return -EINVAL;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700409#endif
410 break;
411 default:
Simon Kagstrom0347af42010-03-05 13:42:49 -0800412 printk(KERN_INFO "lkdtm: Invalid Crash Point\n");
413 return -EINVAL;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700414 }
415
Simon Kagstrom0347af42010-03-05 13:42:49 -0800416 cpoint = which;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700417 if ((ret = register_jprobe(&lkdtm)) < 0) {
Simon Kagstrom0347af42010-03-05 13:42:49 -0800418 printk(KERN_INFO "lkdtm: Couldn't register jprobe\n");
419 cpoint = INVALID;
Ankita Garg8bb31b92006-10-02 02:17:36 -0700420 }
421
Simon Kagstrom0347af42010-03-05 13:42:49 -0800422 return ret;
423}
424
425static ssize_t do_register_entry(enum cname which, struct file *f,
426 const char __user *user_buf, size_t count, loff_t *off)
427{
428 char *buf;
429 int err;
430
431 if (count >= PAGE_SIZE)
432 return -EINVAL;
433
434 buf = (char *)__get_free_page(GFP_KERNEL);
435 if (!buf)
436 return -ENOMEM;
437 if (copy_from_user(buf, user_buf, count)) {
438 free_page((unsigned long) buf);
439 return -EFAULT;
440 }
441 /* NULL-terminate and remove enter */
442 buf[count] = '\0';
443 strim(buf);
444
445 cptype = parse_cp_type(buf, count);
446 free_page((unsigned long) buf);
447
448 if (cptype == NONE)
449 return -EINVAL;
450
451 err = lkdtm_register_cpoint(which);
452 if (err < 0)
453 return err;
454
455 *off += count;
456
457 return count;
458}
459
460/* Generic read callback that just prints out the available crash types */
461static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
462 size_t count, loff_t *off)
463{
464 char *buf;
465 int i, n, out;
466
467 buf = (char *)__get_free_page(GFP_KERNEL);
468
469 n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
470 for (i = 0; i < ARRAY_SIZE(cp_type); i++)
471 n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]);
472 buf[n] = '\0';
473
474 out = simple_read_from_buffer(user_buf, count, off,
475 buf, n);
476 free_page((unsigned long) buf);
477
478 return out;
479}
480
481static int lkdtm_debugfs_open(struct inode *inode, struct file *file)
482{
Ankita Garg8bb31b92006-10-02 02:17:36 -0700483 return 0;
484}
485
Simon Kagstrom0347af42010-03-05 13:42:49 -0800486
487static ssize_t int_hardware_entry(struct file *f, const char __user *buf,
488 size_t count, loff_t *off)
489{
490 return do_register_entry(INT_HARDWARE_ENTRY, f, buf, count, off);
491}
492
493static ssize_t int_hw_irq_en(struct file *f, const char __user *buf,
494 size_t count, loff_t *off)
495{
496 return do_register_entry(INT_HW_IRQ_EN, f, buf, count, off);
497}
498
499static ssize_t int_tasklet_entry(struct file *f, const char __user *buf,
500 size_t count, loff_t *off)
501{
502 return do_register_entry(INT_TASKLET_ENTRY, f, buf, count, off);
503}
504
505static ssize_t fs_devrw_entry(struct file *f, const char __user *buf,
506 size_t count, loff_t *off)
507{
508 return do_register_entry(FS_DEVRW, f, buf, count, off);
509}
510
511static ssize_t mem_swapout_entry(struct file *f, const char __user *buf,
512 size_t count, loff_t *off)
513{
514 return do_register_entry(MEM_SWAPOUT, f, buf, count, off);
515}
516
517static ssize_t timeradd_entry(struct file *f, const char __user *buf,
518 size_t count, loff_t *off)
519{
520 return do_register_entry(TIMERADD, f, buf, count, off);
521}
522
523static ssize_t scsi_dispatch_cmd_entry(struct file *f,
524 const char __user *buf, size_t count, loff_t *off)
525{
526 return do_register_entry(SCSI_DISPATCH_CMD, f, buf, count, off);
527}
528
529static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf,
530 size_t count, loff_t *off)
531{
532 return do_register_entry(IDE_CORE_CP, f, buf, count, off);
533}
534
535/* Special entry to just crash directly. Available without KPROBEs */
536static ssize_t direct_entry(struct file *f, const char __user *user_buf,
537 size_t count, loff_t *off)
538{
539 enum ctype type;
540 char *buf;
541
542 if (count >= PAGE_SIZE)
543 return -EINVAL;
544 if (count < 1)
545 return -EINVAL;
546
547 buf = (char *)__get_free_page(GFP_KERNEL);
548 if (!buf)
549 return -ENOMEM;
550 if (copy_from_user(buf, user_buf, count)) {
551 free_page((unsigned long) buf);
552 return -EFAULT;
553 }
554 /* NULL-terminate and remove enter */
555 buf[count] = '\0';
556 strim(buf);
557
558 type = parse_cp_type(buf, count);
559 free_page((unsigned long) buf);
560 if (type == NONE)
561 return -EINVAL;
562
563 printk(KERN_INFO "lkdtm: Performing direct entry %s\n",
564 cp_type_to_str(type));
565 lkdtm_do_action(type);
566 *off += count;
567
568 return count;
569}
570
571struct crash_entry {
572 const char *name;
573 const struct file_operations fops;
574};
575
576static const struct crash_entry crash_entries[] = {
577 {"DIRECT", {.read = lkdtm_debugfs_read,
578 .open = lkdtm_debugfs_open,
579 .write = direct_entry} },
580 {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read,
581 .open = lkdtm_debugfs_open,
582 .write = int_hardware_entry} },
583 {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read,
584 .open = lkdtm_debugfs_open,
585 .write = int_hw_irq_en} },
586 {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read,
587 .open = lkdtm_debugfs_open,
588 .write = int_tasklet_entry} },
589 {"FS_DEVRW", {.read = lkdtm_debugfs_read,
590 .open = lkdtm_debugfs_open,
591 .write = fs_devrw_entry} },
592 {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read,
593 .open = lkdtm_debugfs_open,
594 .write = mem_swapout_entry} },
595 {"TIMERADD", {.read = lkdtm_debugfs_read,
596 .open = lkdtm_debugfs_open,
597 .write = timeradd_entry} },
598 {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read,
599 .open = lkdtm_debugfs_open,
600 .write = scsi_dispatch_cmd_entry} },
601 {"IDE_CORE_CP", {.read = lkdtm_debugfs_read,
602 .open = lkdtm_debugfs_open,
603 .write = ide_core_cp_entry} },
604};
605
606static struct dentry *lkdtm_debugfs_root;
607
608static int __init lkdtm_module_init(void)
609{
610 int ret = -EINVAL;
611 int n_debugfs_entries = 1; /* Assume only the direct entry */
612 int i;
613
614 /* Register debugfs interface */
615 lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
616 if (!lkdtm_debugfs_root) {
617 printk(KERN_ERR "lkdtm: creating root dir failed\n");
618 return -ENODEV;
619 }
620
621#ifdef CONFIG_KPROBES
622 n_debugfs_entries = ARRAY_SIZE(crash_entries);
623#endif
624
625 for (i = 0; i < n_debugfs_entries; i++) {
626 const struct crash_entry *cur = &crash_entries[i];
627 struct dentry *de;
628
629 de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
630 NULL, &cur->fops);
631 if (de == NULL) {
632 printk(KERN_ERR "lkdtm: could not create %s\n",
633 cur->name);
634 goto out_err;
635 }
636 }
637
638 if (lkdtm_parse_commandline() == -EINVAL) {
639 printk(KERN_INFO "lkdtm: Invalid command\n");
640 goto out_err;
641 }
642
643 if (cpoint != INVALID && cptype != NONE) {
644 ret = lkdtm_register_cpoint(cpoint);
645 if (ret < 0) {
646 printk(KERN_INFO "lkdtm: Invalid crash point %d\n",
647 cpoint);
648 goto out_err;
649 }
650 printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n",
651 cpoint_name, cpoint_type);
652 } else {
653 printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n");
654 }
655
656 return 0;
657
658out_err:
659 debugfs_remove_recursive(lkdtm_debugfs_root);
660 return ret;
661}
662
Adrian Bunk21181162008-02-06 01:36:50 -0800663static void __exit lkdtm_module_exit(void)
Ankita Garg8bb31b92006-10-02 02:17:36 -0700664{
Simon Kagstrom0347af42010-03-05 13:42:49 -0800665 debugfs_remove_recursive(lkdtm_debugfs_root);
666
667 unregister_jprobe(&lkdtm);
668 printk(KERN_INFO "lkdtm: Crash point unregistered\n");
Ankita Garg8bb31b92006-10-02 02:17:36 -0700669}
670
671module_init(lkdtm_module_init);
672module_exit(lkdtm_module_exit);
673
674MODULE_LICENSE("GPL");