Commit | Line | Data |
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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 | |
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), | |
6819d101 KC |
200 | CRASHTYPE(CORRUPT_LIST_ADD), |
201 | CRASHTYPE(CORRUPT_LIST_DEL), | |
e22aa9d7 | 202 | CRASHTYPE(CORRUPT_USER_DS), |
c479e3fd | 203 | CRASHTYPE(CORRUPT_STACK), |
93e78c6b | 204 | CRASHTYPE(CORRUPT_STACK_STRONG), |
7b25a85c KC |
205 | CRASHTYPE(STACK_GUARD_PAGE_LEADING), |
206 | CRASHTYPE(STACK_GUARD_PAGE_TRAILING), | |
c479e3fd KC |
207 | CRASHTYPE(UNALIGNED_LOAD_STORE_WRITE), |
208 | CRASHTYPE(OVERWRITE_ALLOCATION), | |
209 | CRASHTYPE(WRITE_AFTER_FREE), | |
210 | CRASHTYPE(READ_AFTER_FREE), | |
211 | CRASHTYPE(WRITE_BUDDY_AFTER_FREE), | |
212 | CRASHTYPE(READ_BUDDY_AFTER_FREE), | |
213 | CRASHTYPE(SOFTLOCKUP), | |
214 | CRASHTYPE(HARDLOCKUP), | |
215 | CRASHTYPE(SPINLOCKUP), | |
216 | CRASHTYPE(HUNG_TASK), | |
217 | CRASHTYPE(EXEC_DATA), | |
218 | CRASHTYPE(EXEC_STACK), | |
219 | CRASHTYPE(EXEC_KMALLOC), | |
220 | CRASHTYPE(EXEC_VMALLOC), | |
221 | CRASHTYPE(EXEC_RODATA), | |
222 | CRASHTYPE(EXEC_USERSPACE), | |
223 | CRASHTYPE(ACCESS_USERSPACE), | |
224 | CRASHTYPE(WRITE_RO), | |
225 | CRASHTYPE(WRITE_RO_AFTER_INIT), | |
226 | CRASHTYPE(WRITE_KERN), | |
95925c99 KC |
227 | CRASHTYPE(REFCOUNT_INC_OVERFLOW), |
228 | CRASHTYPE(REFCOUNT_ADD_OVERFLOW), | |
229 | CRASHTYPE(REFCOUNT_INC_NOT_ZERO_OVERFLOW), | |
230 | CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_OVERFLOW), | |
231 | CRASHTYPE(REFCOUNT_DEC_ZERO), | |
232 | CRASHTYPE(REFCOUNT_DEC_NEGATIVE), | |
233 | CRASHTYPE(REFCOUNT_DEC_AND_TEST_NEGATIVE), | |
234 | CRASHTYPE(REFCOUNT_SUB_AND_TEST_NEGATIVE), | |
235 | CRASHTYPE(REFCOUNT_INC_ZERO), | |
236 | CRASHTYPE(REFCOUNT_ADD_ZERO), | |
237 | CRASHTYPE(REFCOUNT_INC_SATURATED), | |
238 | CRASHTYPE(REFCOUNT_DEC_SATURATED), | |
239 | CRASHTYPE(REFCOUNT_ADD_SATURATED), | |
240 | CRASHTYPE(REFCOUNT_INC_NOT_ZERO_SATURATED), | |
241 | CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED), | |
242 | CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED), | |
243 | CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED), | |
c7fea488 KC |
244 | CRASHTYPE(REFCOUNT_TIMING), |
245 | CRASHTYPE(ATOMIC_TIMING), | |
c479e3fd KC |
246 | CRASHTYPE(USERCOPY_HEAP_SIZE_TO), |
247 | CRASHTYPE(USERCOPY_HEAP_SIZE_FROM), | |
248 | CRASHTYPE(USERCOPY_HEAP_FLAG_TO), | |
249 | CRASHTYPE(USERCOPY_HEAP_FLAG_FROM), | |
250 | CRASHTYPE(USERCOPY_STACK_FRAME_TO), | |
251 | CRASHTYPE(USERCOPY_STACK_FRAME_FROM), | |
252 | CRASHTYPE(USERCOPY_STACK_BEYOND), | |
253 | CRASHTYPE(USERCOPY_KERNEL), | |
8bb31b9d AG |
254 | }; |
255 | ||
c479e3fd | 256 | |
d87c9788 | 257 | /* Global jprobe entry and crashtype. */ |
c479e3fd KC |
258 | static struct jprobe *lkdtm_jprobe; |
259 | struct crashpoint *lkdtm_crashpoint; | |
260 | struct crashtype *lkdtm_crashtype; | |
8bb31b9d | 261 | |
d87c9788 KC |
262 | /* Module parameters */ |
263 | static int recur_count = -1; | |
8bb31b9d | 264 | module_param(recur_count, int, 0644); |
7d196ac3 | 265 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test"); |
d87c9788 KC |
266 | |
267 | static char* cpoint_name; | |
dca41306 | 268 | module_param(cpoint_name, charp, 0444); |
5d861d92 | 269 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
d87c9788 KC |
270 | |
271 | static char* cpoint_type; | |
dca41306 | 272 | module_param(cpoint_type, charp, 0444); |
5d861d92 RD |
273 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
274 | "hitting the crash point"); | |
d87c9788 KC |
275 | |
276 | static int cpoint_count = DEFAULT_COUNT; | |
5d861d92 RD |
277 | module_param(cpoint_count, int, 0644); |
278 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
279 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 280 | |
0347af4e | 281 | |
c479e3fd KC |
282 | /* Return the crashtype number or NULL if the name is invalid */ |
283 | static struct crashtype *find_crashtype(const char *name) | |
8bb31b9d AG |
284 | { |
285 | int i; | |
0347af4e | 286 | |
c479e3fd KC |
287 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
288 | if (!strcmp(name, crashtypes[i].name)) | |
289 | return &crashtypes[i]; | |
8bb31b9d AG |
290 | } |
291 | ||
c479e3fd | 292 | return NULL; |
8bb31b9d AG |
293 | } |
294 | ||
c479e3fd KC |
295 | /* |
296 | * This is forced noinline just so it distinctly shows up in the stackdump | |
297 | * which makes validation of expected lkdtm crashes easier. | |
298 | */ | |
299 | static noinline void lkdtm_do_action(struct crashtype *crashtype) | |
8bb31b9d | 300 | { |
c479e3fd KC |
301 | BUG_ON(!crashtype || !crashtype->func); |
302 | crashtype->func(); | |
0347af4e SK |
303 | } |
304 | ||
c479e3fd KC |
305 | static int lkdtm_register_cpoint(struct crashpoint *crashpoint, |
306 | struct crashtype *crashtype) | |
8bb31b9d AG |
307 | { |
308 | int ret; | |
309 | ||
c479e3fd KC |
310 | /* If this doesn't have a symbol, just call immediately. */ |
311 | if (!crashpoint->jprobe.kp.symbol_name) { | |
312 | lkdtm_do_action(crashtype); | |
0347af4e | 313 | return 0; |
8bb31b9d AG |
314 | } |
315 | ||
c479e3fd KC |
316 | if (lkdtm_jprobe != NULL) |
317 | unregister_jprobe(lkdtm_jprobe); | |
318 | ||
319 | lkdtm_crashpoint = crashpoint; | |
320 | lkdtm_crashtype = crashtype; | |
321 | lkdtm_jprobe = &crashpoint->jprobe; | |
322 | ret = register_jprobe(lkdtm_jprobe); | |
323 | if (ret < 0) { | |
324 | pr_info("Couldn't register jprobe %s\n", | |
325 | crashpoint->jprobe.kp.symbol_name); | |
326 | lkdtm_jprobe = NULL; | |
327 | lkdtm_crashpoint = NULL; | |
328 | lkdtm_crashtype = NULL; | |
0347af4e SK |
329 | } |
330 | ||
331 | return ret; | |
332 | } | |
333 | ||
2b271cb7 AB |
334 | #ifdef CONFIG_KPROBES |
335 | /* Global crash counter and spinlock. */ | |
336 | static int crash_count = DEFAULT_COUNT; | |
337 | static DEFINE_SPINLOCK(crash_count_lock); | |
338 | ||
339 | /* Called by jprobe entry points. */ | |
340 | static void lkdtm_handler(void) | |
341 | { | |
342 | unsigned long flags; | |
343 | bool do_it = false; | |
344 | ||
345 | BUG_ON(!lkdtm_crashpoint || !lkdtm_crashtype); | |
346 | ||
347 | spin_lock_irqsave(&crash_count_lock, flags); | |
348 | crash_count--; | |
349 | pr_info("Crash point %s of type %s hit, trigger in %d rounds\n", | |
350 | lkdtm_crashpoint->name, lkdtm_crashtype->name, crash_count); | |
351 | ||
352 | if (crash_count == 0) { | |
353 | do_it = true; | |
354 | crash_count = cpoint_count; | |
355 | } | |
356 | spin_unlock_irqrestore(&crash_count_lock, flags); | |
357 | ||
358 | if (do_it) | |
359 | lkdtm_do_action(lkdtm_crashtype); | |
360 | } | |
361 | ||
c479e3fd KC |
362 | static ssize_t lkdtm_debugfs_entry(struct file *f, |
363 | const char __user *user_buf, | |
364 | size_t count, loff_t *off) | |
0347af4e | 365 | { |
c479e3fd KC |
366 | struct crashpoint *crashpoint = file_inode(f)->i_private; |
367 | struct crashtype *crashtype = NULL; | |
0347af4e SK |
368 | char *buf; |
369 | int err; | |
370 | ||
371 | if (count >= PAGE_SIZE) | |
372 | return -EINVAL; | |
373 | ||
374 | buf = (char *)__get_free_page(GFP_KERNEL); | |
375 | if (!buf) | |
376 | return -ENOMEM; | |
377 | if (copy_from_user(buf, user_buf, count)) { | |
378 | free_page((unsigned long) buf); | |
379 | return -EFAULT; | |
380 | } | |
381 | /* NULL-terminate and remove enter */ | |
382 | buf[count] = '\0'; | |
383 | strim(buf); | |
384 | ||
c479e3fd KC |
385 | crashtype = find_crashtype(buf); |
386 | free_page((unsigned long)buf); | |
0347af4e | 387 | |
c479e3fd | 388 | if (!crashtype) |
0347af4e SK |
389 | return -EINVAL; |
390 | ||
c479e3fd | 391 | err = lkdtm_register_cpoint(crashpoint, crashtype); |
0347af4e SK |
392 | if (err < 0) |
393 | return err; | |
394 | ||
395 | *off += count; | |
396 | ||
397 | return count; | |
398 | } | |
2b271cb7 | 399 | #endif |
0347af4e SK |
400 | |
401 | /* Generic read callback that just prints out the available crash types */ | |
402 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
403 | size_t count, loff_t *off) | |
404 | { | |
405 | char *buf; | |
406 | int i, n, out; | |
407 | ||
408 | buf = (char *)__get_free_page(GFP_KERNEL); | |
086ff4b3 AC |
409 | if (buf == NULL) |
410 | return -ENOMEM; | |
0347af4e SK |
411 | |
412 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
c479e3fd KC |
413 | for (i = 0; i < ARRAY_SIZE(crashtypes); i++) { |
414 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", | |
415 | crashtypes[i].name); | |
416 | } | |
0347af4e SK |
417 | buf[n] = '\0'; |
418 | ||
419 | out = simple_read_from_buffer(user_buf, count, off, | |
420 | buf, n); | |
421 | free_page((unsigned long) buf); | |
422 | ||
423 | return out; | |
424 | } | |
425 | ||
426 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
427 | { | |
428 | return 0; | |
429 | } | |
430 | ||
0347af4e SK |
431 | /* Special entry to just crash directly. Available without KPROBEs */ |
432 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
433 | size_t count, loff_t *off) | |
434 | { | |
c479e3fd | 435 | struct crashtype *crashtype; |
0347af4e SK |
436 | char *buf; |
437 | ||
438 | if (count >= PAGE_SIZE) | |
439 | return -EINVAL; | |
440 | if (count < 1) | |
441 | return -EINVAL; | |
442 | ||
443 | buf = (char *)__get_free_page(GFP_KERNEL); | |
444 | if (!buf) | |
445 | return -ENOMEM; | |
446 | if (copy_from_user(buf, user_buf, count)) { | |
447 | free_page((unsigned long) buf); | |
448 | return -EFAULT; | |
449 | } | |
450 | /* NULL-terminate and remove enter */ | |
451 | buf[count] = '\0'; | |
452 | strim(buf); | |
453 | ||
c479e3fd | 454 | crashtype = find_crashtype(buf); |
0347af4e | 455 | free_page((unsigned long) buf); |
c479e3fd | 456 | if (!crashtype) |
0347af4e SK |
457 | return -EINVAL; |
458 | ||
c479e3fd KC |
459 | pr_info("Performing direct entry %s\n", crashtype->name); |
460 | lkdtm_do_action(crashtype); | |
0347af4e SK |
461 | *off += count; |
462 | ||
463 | return count; | |
464 | } | |
465 | ||
0347af4e SK |
466 | static struct dentry *lkdtm_debugfs_root; |
467 | ||
468 | static int __init lkdtm_module_init(void) | |
469 | { | |
c479e3fd KC |
470 | struct crashpoint *crashpoint = NULL; |
471 | struct crashtype *crashtype = NULL; | |
0347af4e | 472 | int ret = -EINVAL; |
0347af4e SK |
473 | int i; |
474 | ||
c479e3fd KC |
475 | /* Neither or both of these need to be set */ |
476 | if ((cpoint_type || cpoint_name) && !(cpoint_type && cpoint_name)) { | |
477 | pr_err("Need both cpoint_type and cpoint_name or neither\n"); | |
478 | return -EINVAL; | |
479 | } | |
480 | ||
481 | if (cpoint_type) { | |
482 | crashtype = find_crashtype(cpoint_type); | |
483 | if (!crashtype) { | |
484 | pr_err("Unknown crashtype '%s'\n", cpoint_type); | |
485 | return -EINVAL; | |
486 | } | |
487 | } | |
488 | ||
489 | if (cpoint_name) { | |
490 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
491 | if (!strcmp(cpoint_name, crashpoints[i].name)) | |
492 | crashpoint = &crashpoints[i]; | |
493 | } | |
494 | ||
495 | /* Refuse unknown crashpoints. */ | |
496 | if (!crashpoint) { | |
497 | pr_err("Invalid crashpoint %s\n", cpoint_name); | |
498 | return -EINVAL; | |
499 | } | |
500 | } | |
501 | ||
2b271cb7 | 502 | #ifdef CONFIG_KPROBES |
c479e3fd KC |
503 | /* Set crash count. */ |
504 | crash_count = cpoint_count; | |
2b271cb7 | 505 | #endif |
c479e3fd | 506 | |
a3dff71c | 507 | /* Handle test-specific initialization. */ |
00f496c4 | 508 | lkdtm_bugs_init(&recur_count); |
0d9eb29b | 509 | lkdtm_perms_init(); |
a3dff71c KC |
510 | lkdtm_usercopy_init(); |
511 | ||
0347af4e SK |
512 | /* Register debugfs interface */ |
513 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
514 | if (!lkdtm_debugfs_root) { | |
feac6e21 | 515 | pr_err("creating root dir failed\n"); |
0347af4e SK |
516 | return -ENODEV; |
517 | } | |
518 | ||
c479e3fd KC |
519 | /* Install debugfs trigger files. */ |
520 | for (i = 0; i < ARRAY_SIZE(crashpoints); i++) { | |
521 | struct crashpoint *cur = &crashpoints[i]; | |
0347af4e SK |
522 | struct dentry *de; |
523 | ||
524 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
c479e3fd | 525 | cur, &cur->fops); |
0347af4e | 526 | if (de == NULL) { |
c479e3fd | 527 | pr_err("could not create crashpoint %s\n", cur->name); |
0347af4e SK |
528 | goto out_err; |
529 | } | |
530 | } | |
531 | ||
c479e3fd KC |
532 | /* Install crashpoint if one was selected. */ |
533 | if (crashpoint) { | |
534 | ret = lkdtm_register_cpoint(crashpoint, crashtype); | |
0347af4e | 535 | if (ret < 0) { |
c479e3fd | 536 | pr_info("Invalid crashpoint %s\n", crashpoint->name); |
0347af4e SK |
537 | goto out_err; |
538 | } | |
feac6e21 | 539 | pr_info("Crash point %s of type %s registered\n", |
c479e3fd | 540 | crashpoint->name, cpoint_type); |
0347af4e | 541 | } else { |
feac6e21 | 542 | pr_info("No crash points registered, enable through debugfs\n"); |
8bb31b9d AG |
543 | } |
544 | ||
8bb31b9d | 545 | return 0; |
0347af4e SK |
546 | |
547 | out_err: | |
548 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
549 | return ret; | |
8bb31b9d AG |
550 | } |
551 | ||
2118116e | 552 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 553 | { |
0347af4e SK |
554 | debugfs_remove_recursive(lkdtm_debugfs_root); |
555 | ||
a3dff71c KC |
556 | /* Handle test-specific clean-up. */ |
557 | lkdtm_usercopy_exit(); | |
aa981a66 | 558 | |
9ba60573 JH |
559 | if (lkdtm_jprobe != NULL) |
560 | unregister_jprobe(lkdtm_jprobe); | |
561 | ||
feac6e21 | 562 | pr_info("Crash point unregistered\n"); |
8bb31b9d AG |
563 | } |
564 | ||
565 | module_init(lkdtm_module_init); | |
566 | module_exit(lkdtm_module_exit); | |
567 | ||
568 | MODULE_LICENSE("GPL"); | |
c479e3fd | 569 | MODULE_DESCRIPTION("Kernel crash testing module"); |