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8bb31b9d AG |
1 | /* |
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 | * | |
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 AG |
32 | */ |
33 | ||
34 | #include <linux/kernel.h> | |
5d861d92 | 35 | #include <linux/fs.h> |
8bb31b9d | 36 | #include <linux/module.h> |
5d861d92 | 37 | #include <linux/buffer_head.h> |
8bb31b9d | 38 | #include <linux/kprobes.h> |
5d861d92 | 39 | #include <linux/list.h> |
8bb31b9d | 40 | #include <linux/init.h> |
8bb31b9d | 41 | #include <linux/interrupt.h> |
5d861d92 | 42 | #include <linux/hrtimer.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
8bb31b9d | 44 | #include <scsi/scsi_cmnd.h> |
0347af4e | 45 | #include <linux/debugfs.h> |
8bb31b9d AG |
46 | |
47 | #ifdef CONFIG_IDE | |
48 | #include <linux/ide.h> | |
49 | #endif | |
50 | ||
8bb31b9d AG |
51 | #define DEFAULT_COUNT 10 |
52 | #define REC_NUM_DEFAULT 10 | |
53 | ||
54 | enum 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, | |
0347af4e SK |
63 | IDE_CORE_CP, |
64 | DIRECT, | |
8bb31b9d AG |
65 | }; |
66 | ||
67 | enum ctype { | |
68 | NONE, | |
69 | PANIC, | |
70 | BUG, | |
71 | EXCEPTION, | |
72 | LOOP, | |
0347af4e SK |
73 | OVERFLOW, |
74 | CORRUPT_STACK, | |
75 | UNALIGNED_LOAD_STORE_WRITE, | |
76 | OVERWRITE_ALLOCATION, | |
77 | WRITE_AFTER_FREE, | |
a48223f9 FW |
78 | SOFTLOCKUP, |
79 | HARDLOCKUP, | |
80 | HUNG_TASK, | |
8bb31b9d AG |
81 | }; |
82 | ||
83 | static 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", | |
0347af4e SK |
91 | "IDE_CORE_CP", |
92 | "DIRECT", | |
8bb31b9d AG |
93 | }; |
94 | ||
95 | static char* cp_type[] = { | |
96 | "PANIC", | |
97 | "BUG", | |
98 | "EXCEPTION", | |
99 | "LOOP", | |
0347af4e SK |
100 | "OVERFLOW", |
101 | "CORRUPT_STACK", | |
102 | "UNALIGNED_LOAD_STORE_WRITE", | |
103 | "OVERWRITE_ALLOCATION", | |
104 | "WRITE_AFTER_FREE", | |
a48223f9 FW |
105 | "SOFTLOCKUP", |
106 | "HARDLOCKUP", | |
107 | "HUNG_TASK", | |
8bb31b9d AG |
108 | }; |
109 | ||
110 | static struct jprobe lkdtm; | |
111 | ||
112 | static int lkdtm_parse_commandline(void); | |
113 | static void lkdtm_handler(void); | |
114 | ||
ec1c620b AV |
115 | static char* cpoint_name; |
116 | static char* cpoint_type; | |
8bb31b9d AG |
117 | static int cpoint_count = DEFAULT_COUNT; |
118 | static int recur_count = REC_NUM_DEFAULT; | |
119 | ||
120 | static enum cname cpoint = INVALID; | |
121 | static enum ctype cptype = NONE; | |
122 | static int count = DEFAULT_COUNT; | |
123 | ||
124 | module_param(recur_count, int, 0644); | |
5d861d92 RD |
125 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ |
126 | "default is 10"); | |
dca41306 | 127 | module_param(cpoint_name, charp, 0444); |
5d861d92 | 128 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
dca41306 | 129 | module_param(cpoint_type, charp, 0444); |
5d861d92 RD |
130 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
131 | "hitting the crash point"); | |
132 | module_param(cpoint_count, int, 0644); | |
133 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
134 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 135 | |
2118116e | 136 | static unsigned int jp_do_irq(unsigned int irq) |
8bb31b9d AG |
137 | { |
138 | lkdtm_handler(); | |
139 | jprobe_return(); | |
140 | return 0; | |
141 | } | |
142 | ||
2118116e AB |
143 | static irqreturn_t jp_handle_irq_event(unsigned int irq, |
144 | struct irqaction *action) | |
8bb31b9d AG |
145 | { |
146 | lkdtm_handler(); | |
147 | jprobe_return(); | |
148 | return 0; | |
149 | } | |
150 | ||
2118116e | 151 | static void jp_tasklet_action(struct softirq_action *a) |
8bb31b9d AG |
152 | { |
153 | lkdtm_handler(); | |
154 | jprobe_return(); | |
155 | } | |
156 | ||
2118116e | 157 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) |
8bb31b9d AG |
158 | { |
159 | lkdtm_handler(); | |
160 | jprobe_return(); | |
161 | } | |
162 | ||
163 | struct scan_control; | |
164 | ||
2118116e AB |
165 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, |
166 | struct zone *zone, | |
167 | struct scan_control *sc) | |
8bb31b9d AG |
168 | { |
169 | lkdtm_handler(); | |
170 | jprobe_return(); | |
171 | return 0; | |
172 | } | |
173 | ||
2118116e AB |
174 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, |
175 | const enum hrtimer_mode mode) | |
8bb31b9d AG |
176 | { |
177 | lkdtm_handler(); | |
178 | jprobe_return(); | |
179 | return 0; | |
180 | } | |
181 | ||
2118116e | 182 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
8bb31b9d AG |
183 | { |
184 | lkdtm_handler(); | |
185 | jprobe_return(); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | #ifdef CONFIG_IDE | |
190 | int 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 | ||
0347af4e SK |
200 | /* Return the crashpoint number or NONE if the name is invalid */ |
201 | static 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 | ||
213 | static 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 | ||
221 | static 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 | ||
8bb31b9d AG |
230 | static int lkdtm_parse_commandline(void) |
231 | { | |
232 | int i; | |
233 | ||
0347af4e | 234 | if (cpoint_count < 1 || recur_count < 1) |
8bb31b9d AG |
235 | return -EINVAL; |
236 | ||
0347af4e SK |
237 | count = cpoint_count; |
238 | ||
239 | /* 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++) { | |
8bb31b9d AG |
252 | if (!strcmp(cpoint_name, cp_name[i])) { |
253 | cpoint = i + 1; | |
0347af4e | 254 | return 0; |
8bb31b9d AG |
255 | } |
256 | } | |
257 | ||
0347af4e SK |
258 | /* Could not find a valid crash point */ |
259 | return -EINVAL; | |
8bb31b9d AG |
260 | } |
261 | ||
262 | static 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 | ||
0347af4e | 274 | static void lkdtm_do_action(enum ctype which) |
8bb31b9d | 275 | { |
0347af4e SK |
276 | 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 | } | |
a48223f9 FW |
329 | 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; | |
0347af4e SK |
343 | case NONE: |
344 | default: | |
345 | break; | |
346 | } | |
347 | ||
348 | } | |
349 | ||
350 | static 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); | |
8bb31b9d AG |
355 | |
356 | if (count == 0) { | |
0347af4e | 357 | lkdtm_do_action(cptype); |
8bb31b9d AG |
358 | count = cpoint_count; |
359 | } | |
360 | } | |
361 | ||
0347af4e | 362 | static int lkdtm_register_cpoint(enum cname which) |
8bb31b9d AG |
363 | { |
364 | int ret; | |
365 | ||
0347af4e SK |
366 | cpoint = INVALID; |
367 | if (lkdtm.entry != NULL) | |
368 | unregister_jprobe(&lkdtm); | |
8bb31b9d | 369 | |
0347af4e SK |
370 | switch (which) { |
371 | case DIRECT: | |
372 | lkdtm_do_action(cptype); | |
373 | return 0; | |
8bb31b9d | 374 | case INT_HARDWARE_ENTRY: |
f58f2fa9 | 375 | lkdtm.kp.symbol_name = "do_IRQ"; |
8bb31b9d AG |
376 | 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: | |
18a61e4a AG |
391 | lkdtm.kp.symbol_name = "shrink_inactive_list"; |
392 | lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; | |
8bb31b9d AG |
393 | 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 | |
0347af4e SK |
407 | printk(KERN_INFO "lkdtm: Crash point not available\n"); |
408 | return -EINVAL; | |
8bb31b9d AG |
409 | #endif |
410 | break; | |
411 | default: | |
0347af4e SK |
412 | printk(KERN_INFO "lkdtm: Invalid Crash Point\n"); |
413 | return -EINVAL; | |
8bb31b9d AG |
414 | } |
415 | ||
0347af4e | 416 | cpoint = which; |
8bb31b9d | 417 | if ((ret = register_jprobe(&lkdtm)) < 0) { |
0347af4e SK |
418 | printk(KERN_INFO "lkdtm: Couldn't register jprobe\n"); |
419 | cpoint = INVALID; | |
420 | } | |
421 | ||
422 | return ret; | |
423 | } | |
424 | ||
425 | static 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 */ | |
461 | static 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 | ||
481 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
482 | { | |
483 | return 0; | |
484 | } | |
485 | ||
486 | ||
487 | static 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 | ||
493 | static 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 | ||
499 | static 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 | ||
505 | static 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 | ||
511 | static 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 | ||
517 | static 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 | ||
523 | static 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 | ||
529 | static 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 */ | |
536 | static 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 | ||
571 | struct crash_entry { | |
572 | const char *name; | |
573 | const struct file_operations fops; | |
574 | }; | |
575 | ||
576 | static const struct crash_entry crash_entries[] = { | |
577 | {"DIRECT", {.read = lkdtm_debugfs_read, | |
05271ec4 | 578 | .llseek = generic_file_llseek, |
0347af4e SK |
579 | .open = lkdtm_debugfs_open, |
580 | .write = direct_entry} }, | |
581 | {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, | |
05271ec4 | 582 | .llseek = generic_file_llseek, |
0347af4e SK |
583 | .open = lkdtm_debugfs_open, |
584 | .write = int_hardware_entry} }, | |
585 | {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, | |
05271ec4 | 586 | .llseek = generic_file_llseek, |
0347af4e SK |
587 | .open = lkdtm_debugfs_open, |
588 | .write = int_hw_irq_en} }, | |
589 | {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, | |
05271ec4 | 590 | .llseek = generic_file_llseek, |
0347af4e SK |
591 | .open = lkdtm_debugfs_open, |
592 | .write = int_tasklet_entry} }, | |
593 | {"FS_DEVRW", {.read = lkdtm_debugfs_read, | |
05271ec4 | 594 | .llseek = generic_file_llseek, |
0347af4e SK |
595 | .open = lkdtm_debugfs_open, |
596 | .write = fs_devrw_entry} }, | |
597 | {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, | |
05271ec4 | 598 | .llseek = generic_file_llseek, |
0347af4e SK |
599 | .open = lkdtm_debugfs_open, |
600 | .write = mem_swapout_entry} }, | |
601 | {"TIMERADD", {.read = lkdtm_debugfs_read, | |
05271ec4 | 602 | .llseek = generic_file_llseek, |
0347af4e SK |
603 | .open = lkdtm_debugfs_open, |
604 | .write = timeradd_entry} }, | |
605 | {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, | |
05271ec4 | 606 | .llseek = generic_file_llseek, |
0347af4e SK |
607 | .open = lkdtm_debugfs_open, |
608 | .write = scsi_dispatch_cmd_entry} }, | |
609 | {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, | |
05271ec4 | 610 | .llseek = generic_file_llseek, |
0347af4e SK |
611 | .open = lkdtm_debugfs_open, |
612 | .write = ide_core_cp_entry} }, | |
613 | }; | |
614 | ||
615 | static struct dentry *lkdtm_debugfs_root; | |
616 | ||
617 | static int __init lkdtm_module_init(void) | |
618 | { | |
619 | int ret = -EINVAL; | |
620 | int n_debugfs_entries = 1; /* Assume only the direct entry */ | |
621 | int i; | |
622 | ||
623 | /* Register debugfs interface */ | |
624 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
625 | if (!lkdtm_debugfs_root) { | |
626 | printk(KERN_ERR "lkdtm: creating root dir failed\n"); | |
627 | return -ENODEV; | |
628 | } | |
629 | ||
630 | #ifdef CONFIG_KPROBES | |
631 | n_debugfs_entries = ARRAY_SIZE(crash_entries); | |
632 | #endif | |
633 | ||
634 | for (i = 0; i < n_debugfs_entries; i++) { | |
635 | const struct crash_entry *cur = &crash_entries[i]; | |
636 | struct dentry *de; | |
637 | ||
638 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
639 | NULL, &cur->fops); | |
640 | if (de == NULL) { | |
641 | printk(KERN_ERR "lkdtm: could not create %s\n", | |
642 | cur->name); | |
643 | goto out_err; | |
644 | } | |
645 | } | |
646 | ||
647 | if (lkdtm_parse_commandline() == -EINVAL) { | |
648 | printk(KERN_INFO "lkdtm: Invalid command\n"); | |
649 | goto out_err; | |
650 | } | |
651 | ||
652 | if (cpoint != INVALID && cptype != NONE) { | |
653 | ret = lkdtm_register_cpoint(cpoint); | |
654 | if (ret < 0) { | |
655 | printk(KERN_INFO "lkdtm: Invalid crash point %d\n", | |
656 | cpoint); | |
657 | goto out_err; | |
658 | } | |
659 | printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n", | |
660 | cpoint_name, cpoint_type); | |
661 | } else { | |
662 | printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n"); | |
8bb31b9d AG |
663 | } |
664 | ||
8bb31b9d | 665 | return 0; |
0347af4e SK |
666 | |
667 | out_err: | |
668 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
669 | return ret; | |
8bb31b9d AG |
670 | } |
671 | ||
2118116e | 672 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 673 | { |
0347af4e SK |
674 | debugfs_remove_recursive(lkdtm_debugfs_root); |
675 | ||
676 | unregister_jprobe(&lkdtm); | |
677 | printk(KERN_INFO "lkdtm: Crash point unregistered\n"); | |
8bb31b9d AG |
678 | } |
679 | ||
680 | module_init(lkdtm_module_init); | |
681 | module_exit(lkdtm_module_exit); | |
682 | ||
683 | MODULE_LICENSE("GPL"); |