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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 | |
31c5c870 | 59 | static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs); |
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); | |
31c5c870 KC |
63 | # define CRASHPOINT_KPROBE(_symbol) \ |
64 | .kprobe = { \ | |
65 | .symbol_name = (_symbol), \ | |
66 | .pre_handler = lkdtm_kprobe_handler, \ | |
67 | }, | |
68 | # define CRASHPOINT_WRITE(_symbol) \ | |
69 | (_symbol) ? lkdtm_debugfs_entry : direct_entry | |
70 | #else | |
71 | # define CRASHPOINT_KPROBE(_symbol) | |
72 | # define CRASHPOINT_WRITE(_symbol) direct_entry | |
f2c6edc1 KC |
73 | #endif |
74 | ||
c479e3fd KC |
75 | /* Crash points */ |
76 | struct crashpoint { | |
77 | const char *name; | |
78 | const struct file_operations fops; | |
31c5c870 | 79 | struct kprobe kprobe; |
8bb31b9d AG |
80 | }; |
81 | ||
31c5c870 | 82 | #define CRASHPOINT(_name, _symbol) \ |
c479e3fd KC |
83 | { \ |
84 | .name = _name, \ | |
85 | .fops = { \ | |
86 | .read = lkdtm_debugfs_read, \ | |
87 | .llseek = generic_file_llseek, \ | |
88 | .open = lkdtm_debugfs_open, \ | |
31c5c870 | 89 | .write = CRASHPOINT_WRITE(_symbol) \ |
c479e3fd | 90 | }, \ |
31c5c870 | 91 | CRASHPOINT_KPROBE(_symbol) \ |
c479e3fd KC |
92 | } |
93 | ||
94 | /* Define the possible places where we can trigger a crash point. */ | |
31c5c870 KC |
95 | static struct crashpoint crashpoints[] = { |
96 | CRASHPOINT("DIRECT", NULL), | |
c479e3fd | 97 | #ifdef CONFIG_KPROBES |
31c5c870 KC |
98 | CRASHPOINT("INT_HARDWARE_ENTRY", "do_IRQ"), |
99 | CRASHPOINT("INT_HW_IRQ_EN", "handle_IRQ_event"), | |
100 | CRASHPOINT("INT_TASKLET_ENTRY", "tasklet_action"), | |
101 | CRASHPOINT("FS_DEVRW", "ll_rw_block"), | |
102 | CRASHPOINT("MEM_SWAPOUT", "shrink_inactive_list"), | |
103 | CRASHPOINT("TIMERADD", "hrtimer_start"), | |
104 | CRASHPOINT("SCSI_DISPATCH_CMD", "scsi_dispatch_cmd"), | |
c479e3fd | 105 | # ifdef CONFIG_IDE |
31c5c870 | 106 | CRASHPOINT("IDE_CORE_CP", "generic_ide_ioctl"), |
c479e3fd KC |
107 | # endif |
108 | #endif | |
8bb31b9d AG |
109 | }; |
110 | ||
c479e3fd KC |
111 | |
112 | /* Crash types. */ | |
113 | struct crashtype { | |
114 | const char *name; | |
115 | void (*func)(void); | |
8bb31b9d AG |
116 | }; |
117 | ||
c479e3fd KC |
118 | #define CRASHTYPE(_name) \ |
119 | { \ | |
120 | .name = __stringify(_name), \ | |
121 | .func = lkdtm_ ## _name, \ | |
122 | } | |
123 | ||
124 | /* Define the possible types of crashes that can be triggered. */ | |
75f98b7a | 125 | static const struct crashtype crashtypes[] = { |
c479e3fd KC |
126 | CRASHTYPE(PANIC), |
127 | CRASHTYPE(BUG), | |
128 | CRASHTYPE(WARNING), | |
129 | CRASHTYPE(EXCEPTION), | |
130 | CRASHTYPE(LOOP), | |
131 | CRASHTYPE(OVERFLOW), | |
6819d101 KC |
132 | CRASHTYPE(CORRUPT_LIST_ADD), |
133 | CRASHTYPE(CORRUPT_LIST_DEL), | |
e22aa9d7 | 134 | CRASHTYPE(CORRUPT_USER_DS), |
c479e3fd | 135 | CRASHTYPE(CORRUPT_STACK), |
93e78c6b | 136 | CRASHTYPE(CORRUPT_STACK_STRONG), |
7b25a85c KC |
137 | CRASHTYPE(STACK_GUARD_PAGE_LEADING), |
138 | CRASHTYPE(STACK_GUARD_PAGE_TRAILING), | |
c479e3fd KC |
139 | CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE), |
140 | CRASHTYPE(OVERWRITE_ALLOCATION), | |
141 | CRASHTYPE(WRITE_AFTER_FREE), | |
142 | CRASHTYPE(READ_AFTER_FREE), | |
143 | CRASHTYPE(WRITE_BUDDY_AFTER_FREE), | |
144 | CRASHTYPE(READ_BUDDY_AFTER_FREE), | |
145 | CRASHTYPE(SOFTLOCKUP), | |
146 | CRASHTYPE(HARDLOCKUP), | |
147 | CRASHTYPE(SPINLOCKUP), | |
148 | CRASHTYPE(HUNG_TASK), | |
149 | CRASHTYPE(EXEC_DATA), | |
150 | CRASHTYPE(EXEC_STACK), | |
151 | CRASHTYPE(EXEC_KMALLOC), | |
152 | CRASHTYPE(EXEC_VMALLOC), | |
153 | CRASHTYPE(EXEC_RODATA), | |
154 | CRASHTYPE(EXEC_USERSPACE), | |
155 | CRASHTYPE(ACCESS_USERSPACE), | |
156 | CRASHTYPE(WRITE_RO), | |
157 | CRASHTYPE(WRITE_RO_AFTER_INIT), | |
158 | CRASHTYPE(WRITE_KERN), | |
95925c99 KC |
159 | CRASHTYPE(REFCOUNT_INC_OVERFLOW), |
160 | CRASHTYPE(REFCOUNT_ADD_OVERFLOW), | |
161 | CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW), | |
162 | CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW), | |
163 | CRASHTYPE(REFCOUNT_DEC_ZERO), | |
164 | CRASHTYPE(REFCOUNT_DEC_NEGATIVE), | |
165 | CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE), | |
166 | CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE), | |
167 | CRASHTYPE(REFCOUNT_INC_ZERO), | |
168 | CRASHTYPE(REFCOUNT_ADD_ZERO), | |
169 | CRASHTYPE(REFCOUNT_INC_SATURATED), | |
170 | CRASHTYPE(REFCOUNT_DEC_SATURATED), | |
171 | CRASHTYPE(REFCOUNT_ADD_SATURATED), | |
172 | CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED), | |
173 | CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED), | |
174 | CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED), | |
175 | CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED), | |
c7fea488 KC |
176 | CRASHTYPE(REFCOUNT_TIMING), |
177 | CRASHTYPE(ATOMIC_TIMING), | |
c479e3fd KC |
178 | CRASHTYPE(USERCOPY_HEAP_SIZE_TO), |
179 | CRASHTYPE(USERCOPY_HEAP_SIZE_FROM), | |
180 | CRASHTYPE(USERCOPY_HEAP_FLAG_TO), | |
181 | CRASHTYPE(USERCOPY_HEAP_FLAG_FROM), | |
182 | CRASHTYPE(USERCOPY_STACK_FRAME_TO), | |
183 | CRASHTYPE(USERCOPY_STACK_FRAME_FROM), | |
184 | CRASHTYPE(USERCOPY_STACK_BEYOND), | |
185 | CRASHTYPE(USERCOPY_KERNEL), | |
8bb31b9d AG |
186 | }; |
187 | ||
c479e3fd | 188 | |
31c5c870 KC |
189 | /* Global kprobe entry and crashtype. */ |
190 | static struct kprobe *lkdtm_kprobe; | |
75f98b7a KC |
191 | static struct crashpoint *lkdtm_crashpoint; |
192 | static const struct crashtype *lkdtm_crashtype; | |
8bb31b9d | 193 | |
d87c9788 KC |
194 | /* Module parameters */ |
195 | static int recur_count = -1; | |
8bb31b9d | 196 | module_param(recur_count, int, 0644); |
7d196ac3 | 197 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test"); |
d87c9788 KC |
198 | |
199 | static char* cpoint_name; | |
dca41306 | 200 | module_param(cpoint_name, charp, 0444); |
5d861d92 | 201 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
d87c9788 KC |
202 | |
203 | static char* cpoint_type; | |
dca41306 | 204 | module_param(cpoint_type, charp, 0444); |
5d861d92 RD |
205 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
206 | "hitting the crash point"); | |
d87c9788 KC |
207 | |
208 | static int cpoint_count = DEFAULT_COUNT; | |
5d861d92 RD |
209 | module_param(cpoint_count, int, 0644); |
210 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
211 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 212 | |
0347af4e | 213 | |
c479e3fd | 214 | /* Return the crashtype number or NULL if the name is invalid */ |
75f98b7a | 215 | static const struct crashtype *find_crashtype(const char *name) |
8bb31b9d AG |
216 | { |
217 | int i; | |
0347af4e | 218 | |
c479e3fd KC |
219 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
220 | if (!strcmp(name, crashtypes[i].name)) | |
221 | return &crashtypes[i]; | |
8bb31b9d AG |
222 | } |
223 | ||
c479e3fd | 224 | return NULL; |
8bb31b9d AG |
225 | } |
226 | ||
c479e3fd KC |
227 | /* |
228 | * This is forced noinline just so it distinctly shows up in the stackdump | |
229 | * which makes validation of expected lkdtm crashes easier. | |
230 | */ | |
75f98b7a | 231 | static noinline void lkdtm_do_action(const struct crashtype *crashtype) |
8bb31b9d | 232 | { |
31c5c870 KC |
233 | if (WARN_ON(!crashtype || !crashtype->func)) |
234 | return; | |
c479e3fd | 235 | crashtype->func(); |
0347af4e SK |
236 | } |
237 | ||
c479e3fd | 238 | static int lkdtm_register_cpoint(struct crashpoint *crashpoint, |
75f98b7a | 239 | const struct crashtype *crashtype) |
8bb31b9d AG |
240 | { |
241 | int ret; | |
242 | ||
c479e3fd | 243 | /* If this doesn't have a symbol, just call immediately. */ |
31c5c870 | 244 | if (!crashpoint->kprobe.symbol_name) { |
c479e3fd | 245 | lkdtm_do_action(crashtype); |
0347af4e | 246 | return 0; |
8bb31b9d AG |
247 | } |
248 | ||
31c5c870 KC |
249 | if (lkdtm_kprobe != NULL) |
250 | unregister_kprobe(lkdtm_kprobe); | |
c479e3fd KC |
251 | |
252 | lkdtm_crashpoint = crashpoint; | |
253 | lkdtm_crashtype = crashtype; | |
31c5c870 KC |
254 | lkdtm_kprobe = &crashpoint->kprobe; |
255 | ret = register_kprobe(lkdtm_kprobe); | |
c479e3fd | 256 | if (ret < 0) { |
31c5c870 KC |
257 | pr_info("Couldn't register kprobe %s\n", |
258 | crashpoint->kprobe.symbol_name); | |
259 | lkdtm_kprobe = NULL; | |
c479e3fd KC |
260 | lkdtm_crashpoint = NULL; |
261 | lkdtm_crashtype = NULL; | |
0347af4e SK |
262 | } |
263 | ||
264 | return ret; | |
265 | } | |
266 | ||
2b271cb7 AB |
267 | #ifdef CONFIG_KPROBES |
268 | /* Global crash counter and spinlock. */ | |
269 | static int crash_count = DEFAULT_COUNT; | |
270 | static DEFINE_SPINLOCK(crash_count_lock); | |
271 | ||
31c5c870 KC |
272 | /* Called by kprobe entry points. */ |
273 | static int lkdtm_kprobe_handler(struct kprobe *kp, struct pt_regs *regs) | |
2b271cb7 AB |
274 | { |
275 | unsigned long flags; | |
276 | bool do_it = false; | |
277 | ||
31c5c870 KC |
278 | if (WARN_ON(!lkdtm_crashpoint || !lkdtm_crashtype)) |
279 | return 0; | |
2b271cb7 AB |
280 | |
281 | spin_lock_irqsave(&crash_count_lock, flags); | |
282 | crash_count--; | |
283 | pr_info("Crash point %s of type %s hit, trigger in %d rounds\n", | |
284 | lkdtm_crashpoint->name, lkdtm_crashtype->name, crash_count); | |
285 | ||
286 | if (crash_count == 0) { | |
287 | do_it = true; | |
288 | crash_count = cpoint_count; | |
289 | } | |
290 | spin_unlock_irqrestore(&crash_count_lock, flags); | |
291 | ||
292 | if (do_it) | |
293 | lkdtm_do_action(lkdtm_crashtype); | |
31c5c870 KC |
294 | |
295 | return 0; | |
2b271cb7 AB |
296 | } |
297 | ||
c479e3fd KC |
298 | static ssize_t lkdtm_debugfs_entry(struct file *f, |
299 | const char __user *user_buf, | |
300 | size_t count, loff_t *off) | |
0347af4e | 301 | { |
c479e3fd | 302 | struct crashpoint *crashpoint = file_inode(f)->i_private; |
75f98b7a | 303 | const struct crashtype *crashtype = NULL; |
0347af4e SK |
304 | char *buf; |
305 | int err; | |
306 | ||
307 | if (count >= PAGE_SIZE) | |
308 | return -EINVAL; | |
309 | ||
310 | buf = (char *)__get_free_page(GFP_KERNEL); | |
311 | if (!buf) | |
312 | return -ENOMEM; | |
313 | if (copy_from_user(buf, user_buf, count)) { | |
314 | free_page((unsigned long) buf); | |
315 | return -EFAULT; | |
316 | } | |
317 | /* NULL-terminate and remove enter */ | |
318 | buf[count] = '\0'; | |
319 | strim(buf); | |
320 | ||
c479e3fd KC |
321 | crashtype = find_crashtype(buf); |
322 | free_page((unsigned long)buf); | |
0347af4e | 323 | |
c479e3fd | 324 | if (!crashtype) |
0347af4e SK |
325 | return -EINVAL; |
326 | ||
c479e3fd | 327 | err = lkdtm_register_cpoint(crashpoint, crashtype); |
0347af4e SK |
328 | if (err < 0) |
329 | return err; | |
330 | ||
331 | *off += count; | |
332 | ||
333 | return count; | |
334 | } | |
2b271cb7 | 335 | #endif |
0347af4e SK |
336 | |
337 | /* Generic read callback that just prints out the available crash types */ | |
338 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
339 | size_t count, loff_t *off) | |
340 | { | |
341 | char *buf; | |
342 | int i, n, out; | |
343 | ||
344 | buf = (char *)__get_free_page(GFP_KERNEL); | |
086ff4b3 AC |
345 | if (buf == NULL) |
346 | return -ENOMEM; | |
0347af4e SK |
347 | |
348 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
c479e3fd KC |
349 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
350 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", | |
351 | crashtypes[i].name); | |
352 | } | |
0347af4e SK |
353 | buf[n] = '\0'; |
354 | ||
355 | out = simple_read_from_buffer(user_buf, count, off, | |
356 | buf, n); | |
357 | free_page((unsigned long) buf); | |
358 | ||
359 | return out; | |
360 | } | |
361 | ||
362 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
363 | { | |
364 | return 0; | |
365 | } | |
366 | ||
0347af4e SK |
367 | /* Special entry to just crash directly. Available without KPROBEs */ |
368 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
369 | size_t count, loff_t *off) | |
370 | { | |
75f98b7a | 371 | const struct crashtype *crashtype; |
0347af4e SK |
372 | char *buf; |
373 | ||
374 | if (count >= PAGE_SIZE) | |
375 | return -EINVAL; | |
376 | if (count < 1) | |
377 | return -EINVAL; | |
378 | ||
379 | buf = (char *)__get_free_page(GFP_KERNEL); | |
380 | if (!buf) | |
381 | return -ENOMEM; | |
382 | if (copy_from_user(buf, user_buf, count)) { | |
383 | free_page((unsigned long) buf); | |
384 | return -EFAULT; | |
385 | } | |
386 | /* NULL-terminate and remove enter */ | |
387 | buf[count] = '\0'; | |
388 | strim(buf); | |
389 | ||
c479e3fd | 390 | crashtype = find_crashtype(buf); |
0347af4e | 391 | free_page((unsigned long) buf); |
c479e3fd | 392 | if (!crashtype) |
0347af4e SK |
393 | return -EINVAL; |
394 | ||
c479e3fd KC |
395 | pr_info("Performing direct entry %s\n", crashtype->name); |
396 | lkdtm_do_action(crashtype); | |
0347af4e SK |
397 | *off += count; |
398 | ||
399 | return count; | |
400 | } | |
401 | ||
0347af4e SK |
402 | static struct dentry *lkdtm_debugfs_root; |
403 | ||
404 | static int __init lkdtm_module_init(void) | |
405 | { | |
c479e3fd | 406 | struct crashpoint *crashpoint = NULL; |
75f98b7a | 407 | const struct crashtype *crashtype = NULL; |
0347af4e | 408 | int ret = -EINVAL; |
0347af4e SK |
409 | int i; |
410 | ||
c479e3fd KC |
411 | /* Neither or both of these need to be set */ |
412 | if ((cpoint_type || cpoint_name) && !(cpoint_type && cpoint_name)) { | |
413 | pr_err("Need both cpoint_type and cpoint_name or neither\n"); | |
414 | return -EINVAL; | |
415 | } | |
416 | ||
417 | if (cpoint_type) { | |
418 | crashtype = find_crashtype(cpoint_type); | |
419 | if (!crashtype) { | |
420 | pr_err("Unknown crashtype '%s'\n", cpoint_type); | |
421 | return -EINVAL; | |
422 | } | |
423 | } | |
424 | ||
425 | if (cpoint_name) { | |
426 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
427 | if (!strcmp(cpoint_name, crashpoints[i].name)) | |
428 | crashpoint = &crashpoints[i]; | |
429 | } | |
430 | ||
431 | /* Refuse unknown crashpoints. */ | |
432 | if (!crashpoint) { | |
433 | pr_err("Invalid crashpoint %s\n", cpoint_name); | |
434 | return -EINVAL; | |
435 | } | |
436 | } | |
437 | ||
2b271cb7 | 438 | #ifdef CONFIG_KPROBES |
c479e3fd KC |
439 | /* Set crash count. */ |
440 | crash_count = cpoint_count; | |
2b271cb7 | 441 | #endif |
c479e3fd | 442 | |
a3dff71c | 443 | /* Handle test-specific initialization. */ |
00f496c4 | 444 | lkdtm_bugs_init(&recur_count); |
0d9eb29b | 445 | lkdtm_perms_init(); |
a3dff71c KC |
446 | lkdtm_usercopy_init(); |
447 | ||
0347af4e SK |
448 | /* Register debugfs interface */ |
449 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
450 | if (!lkdtm_debugfs_root) { | |
feac6e21 | 451 | pr_err("creating root dir failed\n"); |
0347af4e SK |
452 | return -ENODEV; |
453 | } | |
454 | ||
c479e3fd KC |
455 | /* Install debugfs trigger files. */ |
456 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
457 | struct crashpoint *cur = &crashpoints[i]; | |
0347af4e SK |
458 | struct dentry *de; |
459 | ||
460 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
c479e3fd | 461 | cur, &cur->fops); |
0347af4e | 462 | if (de == NULL) { |
c479e3fd | 463 | pr_err("could not create crashpoint %s\n", cur->name); |
0347af4e SK |
464 | goto out_err; |
465 | } | |
466 | } | |
467 | ||
c479e3fd KC |
468 | /* Install crashpoint if one was selected. */ |
469 | if (crashpoint) { | |
470 | ret = lkdtm_register_cpoint(crashpoint, crashtype); | |
0347af4e | 471 | if (ret < 0) { |
c479e3fd | 472 | pr_info("Invalid crashpoint %s\n", crashpoint->name); |
0347af4e SK |
473 | goto out_err; |
474 | } | |
feac6e21 | 475 | pr_info("Crash point %s of type %s registered\n", |
c479e3fd | 476 | crashpoint->name, cpoint_type); |
0347af4e | 477 | } else { |
feac6e21 | 478 | pr_info("No crash points registered, enable through debugfs\n"); |
8bb31b9d AG |
479 | } |
480 | ||
8bb31b9d | 481 | return 0; |
0347af4e SK |
482 | |
483 | out_err: | |
484 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
485 | return ret; | |
8bb31b9d AG |
486 | } |
487 | ||
2118116e | 488 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 489 | { |
0347af4e SK |
490 | debugfs_remove_recursive(lkdtm_debugfs_root); |
491 | ||
a3dff71c KC |
492 | /* Handle test-specific clean-up. */ |
493 | lkdtm_usercopy_exit(); | |
aa981a66 | 494 | |
31c5c870 KC |
495 | if (lkdtm_kprobe != NULL) |
496 | unregister_kprobe(lkdtm_kprobe); | |
9ba60573 | 497 | |
feac6e21 | 498 | pr_info("Crash point unregistered\n"); |
8bb31b9d AG |
499 | } |
500 | ||
501 | module_init(lkdtm_module_init); | |
502 | module_exit(lkdtm_module_exit); | |
503 | ||
504 | MODULE_LICENSE("GPL"); | |
c479e3fd | 505 | MODULE_DESCRIPTION("Kernel crash testing module"); |