Commit | Line | Data |
---|---|---|
8bb31b9d | 1 | /* |
426f3a53 KC |
2 | * Linux Kernel Dump Test Module for testing kernel crashes conditions: |
3 | * induces system failures at predefined crashpoints and under predefined | |
4 | * operational conditions in order to evaluate the reliability of kernel | |
5 | * sanity checking and crash dumps obtained using different dumping | |
6 | * solutions. | |
8bb31b9d AG |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | * | |
22 | * Copyright (C) IBM Corporation, 2006 | |
23 | * | |
24 | * Author: Ankita Garg <ankita@in.ibm.com> | |
25 | * | |
8bb31b9d AG |
26 | * It is adapted from the Linux Kernel Dump Test Tool by |
27 | * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net> | |
28 | * | |
0347af4e | 29 | * Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net> |
8bb31b9d | 30 | * |
0347af4e | 31 | * See Documentation/fault-injection/provoke-crashes.txt for instructions |
8bb31b9d | 32 | */ |
6d2e91a6 | 33 | #include "lkdtm.h" |
5d861d92 | 34 | #include <linux/fs.h> |
8bb31b9d | 35 | #include <linux/module.h> |
5d861d92 | 36 | #include <linux/buffer_head.h> |
8bb31b9d | 37 | #include <linux/kprobes.h> |
5d861d92 | 38 | #include <linux/list.h> |
8bb31b9d | 39 | #include <linux/init.h> |
8bb31b9d | 40 | #include <linux/interrupt.h> |
5d861d92 | 41 | #include <linux/hrtimer.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
8bb31b9d | 43 | #include <scsi/scsi_cmnd.h> |
0347af4e | 44 | #include <linux/debugfs.h> |
8bb31b9d AG |
45 | |
46 | #ifdef CONFIG_IDE | |
47 | #include <linux/ide.h> | |
48 | #endif | |
49 | ||
d87c9788 KC |
50 | #define DEFAULT_COUNT 10 |
51 | ||
c479e3fd KC |
52 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file); |
53 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
54 | size_t count, loff_t *off); | |
55 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
56 | size_t count, loff_t *off); | |
2b271cb7 AB |
57 | |
58 | #ifdef CONFIG_KPROBES | |
59 | static void lkdtm_handler(void); | |
c479e3fd KC |
60 | static ssize_t lkdtm_debugfs_entry(struct file *f, |
61 | const char __user *user_buf, | |
62 | size_t count, loff_t *off); | |
63 | ||
d87c9788 | 64 | |
f2c6edc1 KC |
65 | /* jprobe entry point handlers. */ |
66 | static unsigned int jp_do_irq(unsigned int irq) | |
67 | { | |
68 | lkdtm_handler(); | |
69 | jprobe_return(); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static irqreturn_t jp_handle_irq_event(unsigned int irq, | |
74 | struct irqaction *action) | |
75 | { | |
76 | lkdtm_handler(); | |
77 | jprobe_return(); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static void jp_tasklet_action(struct softirq_action *a) | |
82 | { | |
83 | lkdtm_handler(); | |
84 | jprobe_return(); | |
85 | } | |
86 | ||
87 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) | |
88 | { | |
89 | lkdtm_handler(); | |
90 | jprobe_return(); | |
91 | } | |
92 | ||
93 | struct scan_control; | |
94 | ||
95 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, | |
96 | struct zone *zone, | |
97 | struct scan_control *sc) | |
98 | { | |
99 | lkdtm_handler(); | |
100 | jprobe_return(); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, | |
105 | const enum hrtimer_mode mode) | |
106 | { | |
107 | lkdtm_handler(); | |
108 | jprobe_return(); | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) | |
113 | { | |
114 | lkdtm_handler(); | |
115 | jprobe_return(); | |
116 | return 0; | |
117 | } | |
118 | ||
2b271cb7 | 119 | # ifdef CONFIG_IDE |
f2c6edc1 KC |
120 | static int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, |
121 | struct block_device *bdev, unsigned int cmd, | |
122 | unsigned long arg) | |
123 | { | |
124 | lkdtm_handler(); | |
125 | jprobe_return(); | |
126 | return 0; | |
127 | } | |
2b271cb7 | 128 | # endif |
f2c6edc1 KC |
129 | #endif |
130 | ||
c479e3fd KC |
131 | /* Crash points */ |
132 | struct crashpoint { | |
133 | const char *name; | |
134 | const struct file_operations fops; | |
135 | struct jprobe jprobe; | |
8bb31b9d AG |
136 | }; |
137 | ||
c479e3fd KC |
138 | #define CRASHPOINT(_name, _write, _symbol, _entry) \ |
139 | { \ | |
140 | .name = _name, \ | |
141 | .fops = { \ | |
142 | .read = lkdtm_debugfs_read, \ | |
143 | .llseek = generic_file_llseek, \ | |
144 | .open = lkdtm_debugfs_open, \ | |
145 | .write = _write, \ | |
146 | }, \ | |
147 | .jprobe = { \ | |
148 | .kp.symbol_name = _symbol, \ | |
149 | .entry = (kprobe_opcode_t *)_entry, \ | |
150 | }, \ | |
151 | } | |
152 | ||
153 | /* Define the possible places where we can trigger a crash point. */ | |
154 | struct crashpoint crashpoints[] = { | |
155 | CRASHPOINT("DIRECT", direct_entry, | |
156 | NULL, NULL), | |
157 | #ifdef CONFIG_KPROBES | |
158 | CRASHPOINT("INT_HARDWARE_ENTRY", lkdtm_debugfs_entry, | |
159 | "do_IRQ", jp_do_irq), | |
160 | CRASHPOINT("INT_HW_IRQ_EN", lkdtm_debugfs_entry, | |
161 | "handle_IRQ_event", jp_handle_irq_event), | |
162 | CRASHPOINT("INT_TASKLET_ENTRY", lkdtm_debugfs_entry, | |
163 | "tasklet_action", jp_tasklet_action), | |
164 | CRASHPOINT("FS_DEVRW", lkdtm_debugfs_entry, | |
165 | "ll_rw_block", jp_ll_rw_block), | |
166 | CRASHPOINT("MEM_SWAPOUT", lkdtm_debugfs_entry, | |
167 | "shrink_inactive_list", jp_shrink_inactive_list), | |
168 | CRASHPOINT("TIMERADD", lkdtm_debugfs_entry, | |
169 | "hrtimer_start", jp_hrtimer_start), | |
170 | CRASHPOINT("SCSI_DISPATCH_CMD", lkdtm_debugfs_entry, | |
171 | "scsi_dispatch_cmd", jp_scsi_dispatch_cmd), | |
172 | # ifdef CONFIG_IDE | |
173 | CRASHPOINT("IDE_CORE_CP", lkdtm_debugfs_entry, | |
174 | "generic_ide_ioctl", jp_generic_ide_ioctl), | |
175 | # endif | |
176 | #endif | |
8bb31b9d AG |
177 | }; |
178 | ||
c479e3fd KC |
179 | |
180 | /* Crash types. */ | |
181 | struct crashtype { | |
182 | const char *name; | |
183 | void (*func)(void); | |
8bb31b9d AG |
184 | }; |
185 | ||
c479e3fd KC |
186 | #define CRASHTYPE(_name) \ |
187 | { \ | |
188 | .name = __stringify(_name), \ | |
189 | .func = lkdtm_ ## _name, \ | |
190 | } | |
191 | ||
192 | /* Define the possible types of crashes that can be triggered. */ | |
193 | struct crashtype crashtypes[] = { | |
194 | CRASHTYPE(PANIC), | |
195 | CRASHTYPE(BUG), | |
196 | CRASHTYPE(WARNING), | |
197 | CRASHTYPE(EXCEPTION), | |
198 | CRASHTYPE(LOOP), | |
199 | CRASHTYPE(OVERFLOW), | |
200 | CRASHTYPE(CORRUPT_STACK), | |
201 | CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE), | |
202 | CRASHTYPE(OVERWRITE_ALLOCATION), | |
203 | CRASHTYPE(WRITE_AFTER_FREE), | |
204 | CRASHTYPE(READ_AFTER_FREE), | |
205 | CRASHTYPE(WRITE_BUDDY_AFTER_FREE), | |
206 | CRASHTYPE(READ_BUDDY_AFTER_FREE), | |
207 | CRASHTYPE(SOFTLOCKUP), | |
208 | CRASHTYPE(HARDLOCKUP), | |
209 | CRASHTYPE(SPINLOCKUP), | |
210 | CRASHTYPE(HUNG_TASK), | |
211 | CRASHTYPE(EXEC_DATA), | |
212 | CRASHTYPE(EXEC_STACK), | |
213 | CRASHTYPE(EXEC_KMALLOC), | |
214 | CRASHTYPE(EXEC_VMALLOC), | |
215 | CRASHTYPE(EXEC_RODATA), | |
216 | CRASHTYPE(EXEC_USERSPACE), | |
217 | CRASHTYPE(ACCESS_USERSPACE), | |
218 | CRASHTYPE(WRITE_RO), | |
219 | CRASHTYPE(WRITE_RO_AFTER_INIT), | |
220 | CRASHTYPE(WRITE_KERN), | |
221 | CRASHTYPE(ATOMIC_UNDERFLOW), | |
222 | CRASHTYPE(ATOMIC_OVERFLOW), | |
223 | CRASHTYPE(USERCOPY_HEAP_SIZE_TO), | |
224 | CRASHTYPE(USERCOPY_HEAP_SIZE_FROM), | |
225 | CRASHTYPE(USERCOPY_HEAP_FLAG_TO), | |
226 | CRASHTYPE(USERCOPY_HEAP_FLAG_FROM), | |
227 | CRASHTYPE(USERCOPY_STACK_FRAME_TO), | |
228 | CRASHTYPE(USERCOPY_STACK_FRAME_FROM), | |
229 | CRASHTYPE(USERCOPY_STACK_BEYOND), | |
230 | CRASHTYPE(USERCOPY_KERNEL), | |
8bb31b9d AG |
231 | }; |
232 | ||
c479e3fd | 233 | |
d87c9788 | 234 | /* Global jprobe entry and crashtype. */ |
c479e3fd KC |
235 | static struct jprobe *lkdtm_jprobe; |
236 | struct crashpoint *lkdtm_crashpoint; | |
237 | struct crashtype *lkdtm_crashtype; | |
8bb31b9d | 238 | |
d87c9788 KC |
239 | /* Module parameters */ |
240 | static int recur_count = -1; | |
8bb31b9d | 241 | module_param(recur_count, int, 0644); |
7d196ac3 | 242 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test"); |
d87c9788 KC |
243 | |
244 | static char* cpoint_name; | |
dca41306 | 245 | module_param(cpoint_name, charp, 0444); |
5d861d92 | 246 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
d87c9788 KC |
247 | |
248 | static char* cpoint_type; | |
dca41306 | 249 | module_param(cpoint_type, charp, 0444); |
5d861d92 RD |
250 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
251 | "hitting the crash point"); | |
d87c9788 KC |
252 | |
253 | static int cpoint_count = DEFAULT_COUNT; | |
5d861d92 RD |
254 | module_param(cpoint_count, int, 0644); |
255 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
256 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 257 | |
0347af4e | 258 | |
c479e3fd KC |
259 | /* Return the crashtype number or NULL if the name is invalid */ |
260 | static struct crashtype *find_crashtype(const char *name) | |
8bb31b9d AG |
261 | { |
262 | int i; | |
0347af4e | 263 | |
c479e3fd KC |
264 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
265 | if (!strcmp(name, crashtypes[i].name)) | |
266 | return &crashtypes[i]; | |
8bb31b9d AG |
267 | } |
268 | ||
c479e3fd | 269 | return NULL; |
8bb31b9d AG |
270 | } |
271 | ||
c479e3fd KC |
272 | /* |
273 | * This is forced noinline just so it distinctly shows up in the stackdump | |
274 | * which makes validation of expected lkdtm crashes easier. | |
275 | */ | |
276 | static noinline void lkdtm_do_action(struct crashtype *crashtype) | |
8bb31b9d | 277 | { |
c479e3fd KC |
278 | BUG_ON(!crashtype || !crashtype->func); |
279 | crashtype->func(); | |
0347af4e SK |
280 | } |
281 | ||
c479e3fd KC |
282 | static int lkdtm_register_cpoint(struct crashpoint *crashpoint, |
283 | struct crashtype *crashtype) | |
8bb31b9d AG |
284 | { |
285 | int ret; | |
286 | ||
c479e3fd KC |
287 | /* If this doesn't have a symbol, just call immediately. */ |
288 | if (!crashpoint->jprobe.kp.symbol_name) { | |
289 | lkdtm_do_action(crashtype); | |
0347af4e | 290 | return 0; |
8bb31b9d AG |
291 | } |
292 | ||
c479e3fd KC |
293 | if (lkdtm_jprobe != NULL) |
294 | unregister_jprobe(lkdtm_jprobe); | |
295 | ||
296 | lkdtm_crashpoint = crashpoint; | |
297 | lkdtm_crashtype = crashtype; | |
298 | lkdtm_jprobe = &crashpoint->jprobe; | |
299 | ret = register_jprobe(lkdtm_jprobe); | |
300 | if (ret < 0) { | |
301 | pr_info("Couldn't register jprobe %s\n", | |
302 | crashpoint->jprobe.kp.symbol_name); | |
303 | lkdtm_jprobe = NULL; | |
304 | lkdtm_crashpoint = NULL; | |
305 | lkdtm_crashtype = NULL; | |
0347af4e SK |
306 | } |
307 | ||
308 | return ret; | |
309 | } | |
310 | ||
2b271cb7 AB |
311 | #ifdef CONFIG_KPROBES |
312 | /* Global crash counter and spinlock. */ | |
313 | static int crash_count = DEFAULT_COUNT; | |
314 | static DEFINE_SPINLOCK(crash_count_lock); | |
315 | ||
316 | /* Called by jprobe entry points. */ | |
317 | static void lkdtm_handler(void) | |
318 | { | |
319 | unsigned long flags; | |
320 | bool do_it = false; | |
321 | ||
322 | BUG_ON(!lkdtm_crashpoint || !lkdtm_crashtype); | |
323 | ||
324 | spin_lock_irqsave(&crash_count_lock, flags); | |
325 | crash_count--; | |
326 | pr_info("Crash point %s of type %s hit, trigger in %d rounds\n", | |
327 | lkdtm_crashpoint->name, lkdtm_crashtype->name, crash_count); | |
328 | ||
329 | if (crash_count == 0) { | |
330 | do_it = true; | |
331 | crash_count = cpoint_count; | |
332 | } | |
333 | spin_unlock_irqrestore(&crash_count_lock, flags); | |
334 | ||
335 | if (do_it) | |
336 | lkdtm_do_action(lkdtm_crashtype); | |
337 | } | |
338 | ||
c479e3fd KC |
339 | static ssize_t lkdtm_debugfs_entry(struct file *f, |
340 | const char __user *user_buf, | |
341 | size_t count, loff_t *off) | |
0347af4e | 342 | { |
c479e3fd KC |
343 | struct crashpoint *crashpoint = file_inode(f)->i_private; |
344 | struct crashtype *crashtype = NULL; | |
0347af4e SK |
345 | char *buf; |
346 | int err; | |
347 | ||
348 | if (count >= PAGE_SIZE) | |
349 | return -EINVAL; | |
350 | ||
351 | buf = (char *)__get_free_page(GFP_KERNEL); | |
352 | if (!buf) | |
353 | return -ENOMEM; | |
354 | if (copy_from_user(buf, user_buf, count)) { | |
355 | free_page((unsigned long) buf); | |
356 | return -EFAULT; | |
357 | } | |
358 | /* NULL-terminate and remove enter */ | |
359 | buf[count] = '\0'; | |
360 | strim(buf); | |
361 | ||
c479e3fd KC |
362 | crashtype = find_crashtype(buf); |
363 | free_page((unsigned long)buf); | |
0347af4e | 364 | |
c479e3fd | 365 | if (!crashtype) |
0347af4e SK |
366 | return -EINVAL; |
367 | ||
c479e3fd | 368 | err = lkdtm_register_cpoint(crashpoint, crashtype); |
0347af4e SK |
369 | if (err < 0) |
370 | return err; | |
371 | ||
372 | *off += count; | |
373 | ||
374 | return count; | |
375 | } | |
2b271cb7 | 376 | #endif |
0347af4e SK |
377 | |
378 | /* Generic read callback that just prints out the available crash types */ | |
379 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
380 | size_t count, loff_t *off) | |
381 | { | |
382 | char *buf; | |
383 | int i, n, out; | |
384 | ||
385 | buf = (char *)__get_free_page(GFP_KERNEL); | |
086ff4b3 AC |
386 | if (buf == NULL) |
387 | return -ENOMEM; | |
0347af4e SK |
388 | |
389 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
c479e3fd KC |
390 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
391 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", | |
392 | crashtypes[i].name); | |
393 | } | |
0347af4e SK |
394 | buf[n] = '\0'; |
395 | ||
396 | out = simple_read_from_buffer(user_buf, count, off, | |
397 | buf, n); | |
398 | free_page((unsigned long) buf); | |
399 | ||
400 | return out; | |
401 | } | |
402 | ||
403 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
404 | { | |
405 | return 0; | |
406 | } | |
407 | ||
0347af4e SK |
408 | /* Special entry to just crash directly. Available without KPROBEs */ |
409 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
410 | size_t count, loff_t *off) | |
411 | { | |
c479e3fd | 412 | struct crashtype *crashtype; |
0347af4e SK |
413 | char *buf; |
414 | ||
415 | if (count >= PAGE_SIZE) | |
416 | return -EINVAL; | |
417 | if (count < 1) | |
418 | return -EINVAL; | |
419 | ||
420 | buf = (char *)__get_free_page(GFP_KERNEL); | |
421 | if (!buf) | |
422 | return -ENOMEM; | |
423 | if (copy_from_user(buf, user_buf, count)) { | |
424 | free_page((unsigned long) buf); | |
425 | return -EFAULT; | |
426 | } | |
427 | /* NULL-terminate and remove enter */ | |
428 | buf[count] = '\0'; | |
429 | strim(buf); | |
430 | ||
c479e3fd | 431 | crashtype = find_crashtype(buf); |
0347af4e | 432 | free_page((unsigned long) buf); |
c479e3fd | 433 | if (!crashtype) |
0347af4e SK |
434 | return -EINVAL; |
435 | ||
c479e3fd KC |
436 | pr_info("Performing direct entry %s\n", crashtype->name); |
437 | lkdtm_do_action(crashtype); | |
0347af4e SK |
438 | *off += count; |
439 | ||
440 | return count; | |
441 | } | |
442 | ||
0347af4e SK |
443 | static struct dentry *lkdtm_debugfs_root; |
444 | ||
445 | static int __init lkdtm_module_init(void) | |
446 | { | |
c479e3fd KC |
447 | struct crashpoint *crashpoint = NULL; |
448 | struct crashtype *crashtype = NULL; | |
0347af4e | 449 | int ret = -EINVAL; |
0347af4e SK |
450 | int i; |
451 | ||
c479e3fd KC |
452 | /* Neither or both of these need to be set */ |
453 | if ((cpoint_type || cpoint_name) && !(cpoint_type && cpoint_name)) { | |
454 | pr_err("Need both cpoint_type and cpoint_name or neither\n"); | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | if (cpoint_type) { | |
459 | crashtype = find_crashtype(cpoint_type); | |
460 | if (!crashtype) { | |
461 | pr_err("Unknown crashtype '%s'\n", cpoint_type); | |
462 | return -EINVAL; | |
463 | } | |
464 | } | |
465 | ||
466 | if (cpoint_name) { | |
467 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
468 | if (!strcmp(cpoint_name, crashpoints[i].name)) | |
469 | crashpoint = &crashpoints[i]; | |
470 | } | |
471 | ||
472 | /* Refuse unknown crashpoints. */ | |
473 | if (!crashpoint) { | |
474 | pr_err("Invalid crashpoint %s\n", cpoint_name); | |
475 | return -EINVAL; | |
476 | } | |
477 | } | |
478 | ||
2b271cb7 | 479 | #ifdef CONFIG_KPROBES |
c479e3fd KC |
480 | /* Set crash count. */ |
481 | crash_count = cpoint_count; | |
2b271cb7 | 482 | #endif |
c479e3fd | 483 | |
a3dff71c | 484 | /* Handle test-specific initialization. */ |
00f496c4 | 485 | lkdtm_bugs_init(&recur_count); |
0d9eb29b | 486 | lkdtm_perms_init(); |
a3dff71c KC |
487 | lkdtm_usercopy_init(); |
488 | ||
0347af4e SK |
489 | /* Register debugfs interface */ |
490 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
491 | if (!lkdtm_debugfs_root) { | |
feac6e21 | 492 | pr_err("creating root dir failed\n"); |
0347af4e SK |
493 | return -ENODEV; |
494 | } | |
495 | ||
c479e3fd KC |
496 | /* Install debugfs trigger files. */ |
497 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
498 | struct crashpoint *cur = &crashpoints[i]; | |
0347af4e SK |
499 | struct dentry *de; |
500 | ||
501 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
c479e3fd | 502 | cur, &cur->fops); |
0347af4e | 503 | if (de == NULL) { |
c479e3fd | 504 | pr_err("could not create crashpoint %s\n", cur->name); |
0347af4e SK |
505 | goto out_err; |
506 | } | |
507 | } | |
508 | ||
c479e3fd KC |
509 | /* Install crashpoint if one was selected. */ |
510 | if (crashpoint) { | |
511 | ret = lkdtm_register_cpoint(crashpoint, crashtype); | |
0347af4e | 512 | if (ret < 0) { |
c479e3fd | 513 | pr_info("Invalid crashpoint %s\n", crashpoint->name); |
0347af4e SK |
514 | goto out_err; |
515 | } | |
feac6e21 | 516 | pr_info("Crash point %s of type %s registered\n", |
c479e3fd | 517 | crashpoint->name, cpoint_type); |
0347af4e | 518 | } else { |
feac6e21 | 519 | pr_info("No crash points registered, enable through debugfs\n"); |
8bb31b9d AG |
520 | } |
521 | ||
8bb31b9d | 522 | return 0; |
0347af4e SK |
523 | |
524 | out_err: | |
525 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
526 | return ret; | |
8bb31b9d AG |
527 | } |
528 | ||
2118116e | 529 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 530 | { |
0347af4e SK |
531 | debugfs_remove_recursive(lkdtm_debugfs_root); |
532 | ||
a3dff71c KC |
533 | /* Handle test-specific clean-up. */ |
534 | lkdtm_usercopy_exit(); | |
aa981a66 | 535 | |
c479e3fd | 536 | unregister_jprobe(lkdtm_jprobe); |
feac6e21 | 537 | pr_info("Crash point unregistered\n"); |
8bb31b9d AG |
538 | } |
539 | ||
540 | module_init(lkdtm_module_init); | |
541 | module_exit(lkdtm_module_exit); | |
542 | ||
543 | MODULE_LICENSE("GPL"); | |
c479e3fd | 544 | MODULE_DESCRIPTION("Kernel crash testing module"); |