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34#include <linux/kernel.h>
35#include <linux/fs.h>
36#include <linux/module.h>
37#include <linux/buffer_head.h>
38#include <linux/kprobes.h>
39#include <linux/list.h>
40#include <linux/init.h>
41#include <linux/interrupt.h>
42#include <linux/hrtimer.h>
43#include <linux/slab.h>
44#include <scsi/scsi_cmnd.h>
45#include <linux/debugfs.h>
46#include <linux/vmalloc.h>
47#include <linux/mman.h>
48
49#ifdef CONFIG_IDE
50#include <linux/ide.h>
51#endif
52
53
54
55
56
57
58#if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0)
59#define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2)
60#else
61#define REC_STACK_SIZE (THREAD_SIZE / 8)
62#endif
63#define REC_NUM_DEFAULT ((THREAD_SIZE / REC_STACK_SIZE) * 2)
64
65#define DEFAULT_COUNT 10
66#define EXEC_SIZE 64
67
68enum cname {
69 CN_INVALID,
70 CN_INT_HARDWARE_ENTRY,
71 CN_INT_HW_IRQ_EN,
72 CN_INT_TASKLET_ENTRY,
73 CN_FS_DEVRW,
74 CN_MEM_SWAPOUT,
75 CN_TIMERADD,
76 CN_SCSI_DISPATCH_CMD,
77 CN_IDE_CORE_CP,
78 CN_DIRECT,
79};
80
81enum ctype {
82 CT_NONE,
83 CT_PANIC,
84 CT_BUG,
85 CT_WARNING,
86 CT_EXCEPTION,
87 CT_LOOP,
88 CT_OVERFLOW,
89 CT_CORRUPT_STACK,
90 CT_UNALIGNED_LOAD_STORE_WRITE,
91 CT_OVERWRITE_ALLOCATION,
92 CT_WRITE_AFTER_FREE,
93 CT_SOFTLOCKUP,
94 CT_HARDLOCKUP,
95 CT_SPINLOCKUP,
96 CT_HUNG_TASK,
97 CT_EXEC_DATA,
98 CT_EXEC_STACK,
99 CT_EXEC_KMALLOC,
100 CT_EXEC_VMALLOC,
101 CT_EXEC_USERSPACE,
102 CT_ACCESS_USERSPACE,
103 CT_WRITE_RO,
104};
105
106static char* cp_name[] = {
107 "INT_HARDWARE_ENTRY",
108 "INT_HW_IRQ_EN",
109 "INT_TASKLET_ENTRY",
110 "FS_DEVRW",
111 "MEM_SWAPOUT",
112 "TIMERADD",
113 "SCSI_DISPATCH_CMD",
114 "IDE_CORE_CP",
115 "DIRECT",
116};
117
118static char* cp_type[] = {
119 "PANIC",
120 "BUG",
121 "WARNING",
122 "EXCEPTION",
123 "LOOP",
124 "OVERFLOW",
125 "CORRUPT_STACK",
126 "UNALIGNED_LOAD_STORE_WRITE",
127 "OVERWRITE_ALLOCATION",
128 "WRITE_AFTER_FREE",
129 "SOFTLOCKUP",
130 "HARDLOCKUP",
131 "SPINLOCKUP",
132 "HUNG_TASK",
133 "EXEC_DATA",
134 "EXEC_STACK",
135 "EXEC_KMALLOC",
136 "EXEC_VMALLOC",
137 "EXEC_USERSPACE",
138 "ACCESS_USERSPACE",
139 "WRITE_RO",
140};
141
142static struct jprobe lkdtm;
143
144static int lkdtm_parse_commandline(void);
145static void lkdtm_handler(void);
146
147static char* cpoint_name;
148static char* cpoint_type;
149static int cpoint_count = DEFAULT_COUNT;
150static int recur_count = REC_NUM_DEFAULT;
151
152static enum cname cpoint = CN_INVALID;
153static enum ctype cptype = CT_NONE;
154static int count = DEFAULT_COUNT;
155static DEFINE_SPINLOCK(count_lock);
156static DEFINE_SPINLOCK(lock_me_up);
157
158static u8 data_area[EXEC_SIZE];
159
160static const unsigned long rodata = 0xAA55AA55;
161
162module_param(recur_count, int, 0644);
163MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test");
164module_param(cpoint_name, charp, 0444);
165MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
166module_param(cpoint_type, charp, 0444);
167MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
168 "hitting the crash point");
169module_param(cpoint_count, int, 0644);
170MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
171 "crash point is to be hit to trigger action");
172
173static unsigned int jp_do_irq(unsigned int irq)
174{
175 lkdtm_handler();
176 jprobe_return();
177 return 0;
178}
179
180static irqreturn_t jp_handle_irq_event(unsigned int irq,
181 struct irqaction *action)
182{
183 lkdtm_handler();
184 jprobe_return();
185 return 0;
186}
187
188static void jp_tasklet_action(struct softirq_action *a)
189{
190 lkdtm_handler();
191 jprobe_return();
192}
193
194static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
195{
196 lkdtm_handler();
197 jprobe_return();
198}
199
200struct scan_control;
201
202static unsigned long jp_shrink_inactive_list(unsigned long max_scan,
203 struct zone *zone,
204 struct scan_control *sc)
205{
206 lkdtm_handler();
207 jprobe_return();
208 return 0;
209}
210
211static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
212 const enum hrtimer_mode mode)
213{
214 lkdtm_handler();
215 jprobe_return();
216 return 0;
217}
218
219static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
220{
221 lkdtm_handler();
222 jprobe_return();
223 return 0;
224}
225
226#ifdef CONFIG_IDE
227int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
228 struct block_device *bdev, unsigned int cmd,
229 unsigned long arg)
230{
231 lkdtm_handler();
232 jprobe_return();
233 return 0;
234}
235#endif
236
237
238static enum ctype parse_cp_type(const char *what, size_t count)
239{
240 int i;
241
242 for (i = 0; i < ARRAY_SIZE(cp_type); i++) {
243 if (!strcmp(what, cp_type[i]))
244 return i + 1;
245 }
246
247 return CT_NONE;
248}
249
250static const char *cp_type_to_str(enum ctype type)
251{
252 if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type))
253 return "None";
254
255 return cp_type[type - 1];
256}
257
258static const char *cp_name_to_str(enum cname name)
259{
260 if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name))
261 return "INVALID";
262
263 return cp_name[name - 1];
264}
265
266
267static int lkdtm_parse_commandline(void)
268{
269 int i;
270 unsigned long flags;
271
272 if (cpoint_count < 1 || recur_count < 1)
273 return -EINVAL;
274
275 spin_lock_irqsave(&count_lock, flags);
276 count = cpoint_count;
277 spin_unlock_irqrestore(&count_lock, flags);
278
279
280 if (!cpoint_type && !cpoint_name)
281 return 0;
282
283
284 if (!cpoint_type || !cpoint_name)
285 return -EINVAL;
286
287 cptype = parse_cp_type(cpoint_type, strlen(cpoint_type));
288 if (cptype == CT_NONE)
289 return -EINVAL;
290
291 for (i = 0; i < ARRAY_SIZE(cp_name); i++) {
292 if (!strcmp(cpoint_name, cp_name[i])) {
293 cpoint = i + 1;
294 return 0;
295 }
296 }
297
298
299 return -EINVAL;
300}
301
302static int recursive_loop(int remaining)
303{
304 char buf[REC_STACK_SIZE];
305
306
307 memset(buf, (remaining & 0xff) | 0x1, REC_STACK_SIZE);
308 if (!remaining)
309 return 0;
310 else
311 return recursive_loop(remaining - 1);
312}
313
314static void do_nothing(void)
315{
316 return;
317}
318
319static noinline void corrupt_stack(void)
320{
321
322 char data[8];
323
324 memset((void *)data, 0, 64);
325}
326
327static void execute_location(void *dst)
328{
329 void (*func)(void) = dst;
330
331 memcpy(dst, do_nothing, EXEC_SIZE);
332 func();
333}
334
335static void execute_user_location(void *dst)
336{
337 void (*func)(void) = dst;
338
339 if (copy_to_user(dst, do_nothing, EXEC_SIZE))
340 return;
341 func();
342}
343
344static void lkdtm_do_action(enum ctype which)
345{
346 switch (which) {
347 case CT_PANIC:
348 panic("dumptest");
349 break;
350 case CT_BUG:
351 BUG();
352 break;
353 case CT_WARNING:
354 WARN_ON(1);
355 break;
356 case CT_EXCEPTION:
357 *((int *) 0) = 0;
358 break;
359 case CT_LOOP:
360 for (;;)
361 ;
362 break;
363 case CT_OVERFLOW:
364 (void) recursive_loop(recur_count);
365 break;
366 case CT_CORRUPT_STACK:
367 corrupt_stack();
368 break;
369 case CT_UNALIGNED_LOAD_STORE_WRITE: {
370 static u8 data[5] __attribute__((aligned(4))) = {1, 2,
371 3, 4, 5};
372 u32 *p;
373 u32 val = 0x12345678;
374
375 p = (u32 *)(data + 1);
376 if (*p == 0)
377 val = 0x87654321;
378 *p = val;
379 break;
380 }
381 case CT_OVERWRITE_ALLOCATION: {
382 size_t len = 1020;
383 u32 *data = kmalloc(len, GFP_KERNEL);
384
385 data[1024 / sizeof(u32)] = 0x12345678;
386 kfree(data);
387 break;
388 }
389 case CT_WRITE_AFTER_FREE: {
390 size_t len = 1024;
391 u32 *data = kmalloc(len, GFP_KERNEL);
392
393 kfree(data);
394 schedule();
395 memset(data, 0x78, len);
396 break;
397 }
398 case CT_SOFTLOCKUP:
399 preempt_disable();
400 for (;;)
401 cpu_relax();
402 break;
403 case CT_HARDLOCKUP:
404 local_irq_disable();
405 for (;;)
406 cpu_relax();
407 break;
408 case CT_SPINLOCKUP:
409
410 spin_lock(&lock_me_up);
411 break;
412 case CT_HUNG_TASK:
413 set_current_state(TASK_UNINTERRUPTIBLE);
414 schedule();
415 break;
416 case CT_EXEC_DATA:
417 execute_location(data_area);
418 break;
419 case CT_EXEC_STACK: {
420 u8 stack_area[EXEC_SIZE];
421 execute_location(stack_area);
422 break;
423 }
424 case CT_EXEC_KMALLOC: {
425 u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL);
426 execute_location(kmalloc_area);
427 kfree(kmalloc_area);
428 break;
429 }
430 case CT_EXEC_VMALLOC: {
431 u32 *vmalloc_area = vmalloc(EXEC_SIZE);
432 execute_location(vmalloc_area);
433 vfree(vmalloc_area);
434 break;
435 }
436 case CT_EXEC_USERSPACE: {
437 unsigned long user_addr;
438
439 user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
440 PROT_READ | PROT_WRITE | PROT_EXEC,
441 MAP_ANONYMOUS | MAP_PRIVATE, 0);
442 if (user_addr >= TASK_SIZE) {
443 pr_warn("Failed to allocate user memory\n");
444 return;
445 }
446 execute_user_location((void *)user_addr);
447 vm_munmap(user_addr, PAGE_SIZE);
448 break;
449 }
450 case CT_ACCESS_USERSPACE: {
451 unsigned long user_addr, tmp;
452 unsigned long *ptr;
453
454 user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
455 PROT_READ | PROT_WRITE | PROT_EXEC,
456 MAP_ANONYMOUS | MAP_PRIVATE, 0);
457 if (user_addr >= TASK_SIZE) {
458 pr_warn("Failed to allocate user memory\n");
459 return;
460 }
461
462 ptr = (unsigned long *)user_addr;
463 tmp = *ptr;
464 tmp += 0xc0dec0de;
465 *ptr = tmp;
466
467 vm_munmap(user_addr, PAGE_SIZE);
468
469 break;
470 }
471 case CT_WRITE_RO: {
472 unsigned long *ptr;
473
474 ptr = (unsigned long *)&rodata;
475 *ptr ^= 0xabcd1234;
476
477 break;
478 }
479 case CT_NONE:
480 default:
481 break;
482 }
483
484}
485
486static void lkdtm_handler(void)
487{
488 unsigned long flags;
489 bool do_it = false;
490
491 spin_lock_irqsave(&count_lock, flags);
492 count--;
493 printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n",
494 cp_name_to_str(cpoint), cp_type_to_str(cptype), count);
495
496 if (count == 0) {
497 do_it = true;
498 count = cpoint_count;
499 }
500 spin_unlock_irqrestore(&count_lock, flags);
501
502 if (do_it)
503 lkdtm_do_action(cptype);
504}
505
506static int lkdtm_register_cpoint(enum cname which)
507{
508 int ret;
509
510 cpoint = CN_INVALID;
511 if (lkdtm.entry != NULL)
512 unregister_jprobe(&lkdtm);
513
514 switch (which) {
515 case CN_DIRECT:
516 lkdtm_do_action(cptype);
517 return 0;
518 case CN_INT_HARDWARE_ENTRY:
519 lkdtm.kp.symbol_name = "do_IRQ";
520 lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
521 break;
522 case CN_INT_HW_IRQ_EN:
523 lkdtm.kp.symbol_name = "handle_IRQ_event";
524 lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
525 break;
526 case CN_INT_TASKLET_ENTRY:
527 lkdtm.kp.symbol_name = "tasklet_action";
528 lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
529 break;
530 case CN_FS_DEVRW:
531 lkdtm.kp.symbol_name = "ll_rw_block";
532 lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
533 break;
534 case CN_MEM_SWAPOUT:
535 lkdtm.kp.symbol_name = "shrink_inactive_list";
536 lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
537 break;
538 case CN_TIMERADD:
539 lkdtm.kp.symbol_name = "hrtimer_start";
540 lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
541 break;
542 case CN_SCSI_DISPATCH_CMD:
543 lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
544 lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
545 break;
546 case CN_IDE_CORE_CP:
547#ifdef CONFIG_IDE
548 lkdtm.kp.symbol_name = "generic_ide_ioctl";
549 lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;
550#else
551 printk(KERN_INFO "lkdtm: Crash point not available\n");
552 return -EINVAL;
553#endif
554 break;
555 default:
556 printk(KERN_INFO "lkdtm: Invalid Crash Point\n");
557 return -EINVAL;
558 }
559
560 cpoint = which;
561 if ((ret = register_jprobe(&lkdtm)) < 0) {
562 printk(KERN_INFO "lkdtm: Couldn't register jprobe\n");
563 cpoint = CN_INVALID;
564 }
565
566 return ret;
567}
568
569static ssize_t do_register_entry(enum cname which, struct file *f,
570 const char __user *user_buf, size_t count, loff_t *off)
571{
572 char *buf;
573 int err;
574
575 if (count >= PAGE_SIZE)
576 return -EINVAL;
577
578 buf = (char *)__get_free_page(GFP_KERNEL);
579 if (!buf)
580 return -ENOMEM;
581 if (copy_from_user(buf, user_buf, count)) {
582 free_page((unsigned long) buf);
583 return -EFAULT;
584 }
585
586 buf[count] = '\0';
587 strim(buf);
588
589 cptype = parse_cp_type(buf, count);
590 free_page((unsigned long) buf);
591
592 if (cptype == CT_NONE)
593 return -EINVAL;
594
595 err = lkdtm_register_cpoint(which);
596 if (err < 0)
597 return err;
598
599 *off += count;
600
601 return count;
602}
603
604
605static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
606 size_t count, loff_t *off)
607{
608 char *buf;
609 int i, n, out;
610
611 buf = (char *)__get_free_page(GFP_KERNEL);
612 if (buf == NULL)
613 return -ENOMEM;
614
615 n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
616 for (i = 0; i < ARRAY_SIZE(cp_type); i++)
617 n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]);
618 buf[n] = '\0';
619
620 out = simple_read_from_buffer(user_buf, count, off,
621 buf, n);
622 free_page((unsigned long) buf);
623
624 return out;
625}
626
627static int lkdtm_debugfs_open(struct inode *inode, struct file *file)
628{
629 return 0;
630}
631
632
633static ssize_t int_hardware_entry(struct file *f, const char __user *buf,
634 size_t count, loff_t *off)
635{
636 return do_register_entry(CN_INT_HARDWARE_ENTRY, f, buf, count, off);
637}
638
639static ssize_t int_hw_irq_en(struct file *f, const char __user *buf,
640 size_t count, loff_t *off)
641{
642 return do_register_entry(CN_INT_HW_IRQ_EN, f, buf, count, off);
643}
644
645static ssize_t int_tasklet_entry(struct file *f, const char __user *buf,
646 size_t count, loff_t *off)
647{
648 return do_register_entry(CN_INT_TASKLET_ENTRY, f, buf, count, off);
649}
650
651static ssize_t fs_devrw_entry(struct file *f, const char __user *buf,
652 size_t count, loff_t *off)
653{
654 return do_register_entry(CN_FS_DEVRW, f, buf, count, off);
655}
656
657static ssize_t mem_swapout_entry(struct file *f, const char __user *buf,
658 size_t count, loff_t *off)
659{
660 return do_register_entry(CN_MEM_SWAPOUT, f, buf, count, off);
661}
662
663static ssize_t timeradd_entry(struct file *f, const char __user *buf,
664 size_t count, loff_t *off)
665{
666 return do_register_entry(CN_TIMERADD, f, buf, count, off);
667}
668
669static ssize_t scsi_dispatch_cmd_entry(struct file *f,
670 const char __user *buf, size_t count, loff_t *off)
671{
672 return do_register_entry(CN_SCSI_DISPATCH_CMD, f, buf, count, off);
673}
674
675static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf,
676 size_t count, loff_t *off)
677{
678 return do_register_entry(CN_IDE_CORE_CP, f, buf, count, off);
679}
680
681
682static ssize_t direct_entry(struct file *f, const char __user *user_buf,
683 size_t count, loff_t *off)
684{
685 enum ctype type;
686 char *buf;
687
688 if (count >= PAGE_SIZE)
689 return -EINVAL;
690 if (count < 1)
691 return -EINVAL;
692
693 buf = (char *)__get_free_page(GFP_KERNEL);
694 if (!buf)
695 return -ENOMEM;
696 if (copy_from_user(buf, user_buf, count)) {
697 free_page((unsigned long) buf);
698 return -EFAULT;
699 }
700
701 buf[count] = '\0';
702 strim(buf);
703
704 type = parse_cp_type(buf, count);
705 free_page((unsigned long) buf);
706 if (type == CT_NONE)
707 return -EINVAL;
708
709 printk(KERN_INFO "lkdtm: Performing direct entry %s\n",
710 cp_type_to_str(type));
711 lkdtm_do_action(type);
712 *off += count;
713
714 return count;
715}
716
717struct crash_entry {
718 const char *name;
719 const struct file_operations fops;
720};
721
722static const struct crash_entry crash_entries[] = {
723 {"DIRECT", {.read = lkdtm_debugfs_read,
724 .llseek = generic_file_llseek,
725 .open = lkdtm_debugfs_open,
726 .write = direct_entry} },
727 {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read,
728 .llseek = generic_file_llseek,
729 .open = lkdtm_debugfs_open,
730 .write = int_hardware_entry} },
731 {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read,
732 .llseek = generic_file_llseek,
733 .open = lkdtm_debugfs_open,
734 .write = int_hw_irq_en} },
735 {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read,
736 .llseek = generic_file_llseek,
737 .open = lkdtm_debugfs_open,
738 .write = int_tasklet_entry} },
739 {"FS_DEVRW", {.read = lkdtm_debugfs_read,
740 .llseek = generic_file_llseek,
741 .open = lkdtm_debugfs_open,
742 .write = fs_devrw_entry} },
743 {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read,
744 .llseek = generic_file_llseek,
745 .open = lkdtm_debugfs_open,
746 .write = mem_swapout_entry} },
747 {"TIMERADD", {.read = lkdtm_debugfs_read,
748 .llseek = generic_file_llseek,
749 .open = lkdtm_debugfs_open,
750 .write = timeradd_entry} },
751 {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read,
752 .llseek = generic_file_llseek,
753 .open = lkdtm_debugfs_open,
754 .write = scsi_dispatch_cmd_entry} },
755 {"IDE_CORE_CP", {.read = lkdtm_debugfs_read,
756 .llseek = generic_file_llseek,
757 .open = lkdtm_debugfs_open,
758 .write = ide_core_cp_entry} },
759};
760
761static struct dentry *lkdtm_debugfs_root;
762
763static int __init lkdtm_module_init(void)
764{
765 int ret = -EINVAL;
766 int n_debugfs_entries = 1;
767 int i;
768
769
770 lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
771 if (!lkdtm_debugfs_root) {
772 printk(KERN_ERR "lkdtm: creating root dir failed\n");
773 return -ENODEV;
774 }
775
776#ifdef CONFIG_KPROBES
777 n_debugfs_entries = ARRAY_SIZE(crash_entries);
778#endif
779
780 for (i = 0; i < n_debugfs_entries; i++) {
781 const struct crash_entry *cur = &crash_entries[i];
782 struct dentry *de;
783
784 de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
785 NULL, &cur->fops);
786 if (de == NULL) {
787 printk(KERN_ERR "lkdtm: could not create %s\n",
788 cur->name);
789 goto out_err;
790 }
791 }
792
793 if (lkdtm_parse_commandline() == -EINVAL) {
794 printk(KERN_INFO "lkdtm: Invalid command\n");
795 goto out_err;
796 }
797
798 if (cpoint != CN_INVALID && cptype != CT_NONE) {
799 ret = lkdtm_register_cpoint(cpoint);
800 if (ret < 0) {
801 printk(KERN_INFO "lkdtm: Invalid crash point %d\n",
802 cpoint);
803 goto out_err;
804 }
805 printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n",
806 cpoint_name, cpoint_type);
807 } else {
808 printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n");
809 }
810
811 return 0;
812
813out_err:
814 debugfs_remove_recursive(lkdtm_debugfs_root);
815 return ret;
816}
817
818static void __exit lkdtm_module_exit(void)
819{
820 debugfs_remove_recursive(lkdtm_debugfs_root);
821
822 unregister_jprobe(&lkdtm);
823 printk(KERN_INFO "lkdtm: Crash point unregistered\n");
824}
825
826module_init(lkdtm_module_init);
827module_exit(lkdtm_module_exit);
828
829MODULE_LICENSE("GPL");
830
