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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 | * |
29 | * Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net> |
30 | * |
31 | * See Documentation/fault-injection/provoke-crashes.txt for instructions |
32 | */ |
33 | |
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 | |
47 | #ifdef CONFIG_IDE |
48 | #include <linux/ide.h> |
49 | #endif |
50 | |
51 | #define DEFAULT_COUNT 10 |
52 | #define REC_NUM_DEFAULT 10 |
53 | |
54 | enum cname { |
55 | CN_INVALID, |
56 | CN_INT_HARDWARE_ENTRY, |
57 | CN_INT_HW_IRQ_EN, |
58 | CN_INT_TASKLET_ENTRY, |
59 | CN_FS_DEVRW, |
60 | CN_MEM_SWAPOUT, |
61 | CN_TIMERADD, |
62 | CN_SCSI_DISPATCH_CMD, |
63 | CN_IDE_CORE_CP, |
64 | CN_DIRECT, |
65 | }; |
66 | |
67 | enum ctype { |
68 | CT_NONE, |
69 | CT_PANIC, |
70 | CT_BUG, |
71 | CT_EXCEPTION, |
72 | CT_LOOP, |
73 | CT_OVERFLOW, |
74 | CT_CORRUPT_STACK, |
75 | CT_UNALIGNED_LOAD_STORE_WRITE, |
76 | CT_OVERWRITE_ALLOCATION, |
77 | CT_WRITE_AFTER_FREE, |
78 | CT_SOFTLOCKUP, |
79 | CT_HARDLOCKUP, |
80 | CT_HUNG_TASK, |
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", |
91 | "IDE_CORE_CP", |
92 | "DIRECT", |
93 | }; |
94 | |
95 | static char* cp_type[] = { |
96 | "PANIC", |
97 | "BUG", |
98 | "EXCEPTION", |
99 | "LOOP", |
100 | "OVERFLOW", |
101 | "CORRUPT_STACK", |
102 | "UNALIGNED_LOAD_STORE_WRITE", |
103 | "OVERWRITE_ALLOCATION", |
104 | "WRITE_AFTER_FREE", |
105 | "SOFTLOCKUP", |
106 | "HARDLOCKUP", |
107 | "HUNG_TASK", |
108 | }; |
109 | |
110 | static struct jprobe lkdtm; |
111 | |
112 | static int lkdtm_parse_commandline(void); |
113 | static void lkdtm_handler(void); |
114 | |
115 | static char* cpoint_name; |
116 | static char* cpoint_type; |
117 | static int cpoint_count = DEFAULT_COUNT; |
118 | static int recur_count = REC_NUM_DEFAULT; |
119 | |
120 | static enum cname cpoint = CN_INVALID; |
121 | static enum ctype cptype = CT_NONE; |
122 | static int count = DEFAULT_COUNT; |
123 | static DEFINE_SPINLOCK(count_lock); |
124 | |
125 | module_param(recur_count, int, 0644); |
126 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ |
127 | "default is 10"); |
128 | module_param(cpoint_name, charp, 0444); |
129 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
130 | module_param(cpoint_type, charp, 0444); |
131 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
132 | "hitting the crash point"); |
133 | module_param(cpoint_count, int, 0644); |
134 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ |
135 | "crash point is to be hit to trigger action"); |
136 | |
137 | static unsigned int jp_do_irq(unsigned int irq) |
138 | { |
139 | lkdtm_handler(); |
140 | jprobe_return(); |
141 | return 0; |
142 | } |
143 | |
144 | static irqreturn_t jp_handle_irq_event(unsigned int irq, |
145 | struct irqaction *action) |
146 | { |
147 | lkdtm_handler(); |
148 | jprobe_return(); |
149 | return 0; |
150 | } |
151 | |
152 | static void jp_tasklet_action(struct softirq_action *a) |
153 | { |
154 | lkdtm_handler(); |
155 | jprobe_return(); |
156 | } |
157 | |
158 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) |
159 | { |
160 | lkdtm_handler(); |
161 | jprobe_return(); |
162 | } |
163 | |
164 | struct scan_control; |
165 | |
166 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, |
167 | struct zone *zone, |
168 | struct scan_control *sc) |
169 | { |
170 | lkdtm_handler(); |
171 | jprobe_return(); |
172 | return 0; |
173 | } |
174 | |
175 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, |
176 | const enum hrtimer_mode mode) |
177 | { |
178 | lkdtm_handler(); |
179 | jprobe_return(); |
180 | return 0; |
181 | } |
182 | |
183 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
184 | { |
185 | lkdtm_handler(); |
186 | jprobe_return(); |
187 | return 0; |
188 | } |
189 | |
190 | #ifdef CONFIG_IDE |
191 | int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, |
192 | struct block_device *bdev, unsigned int cmd, |
193 | unsigned long arg) |
194 | { |
195 | lkdtm_handler(); |
196 | jprobe_return(); |
197 | return 0; |
198 | } |
199 | #endif |
200 | |
201 | /* Return the crashpoint number or NONE if the name is invalid */ |
202 | static enum ctype parse_cp_type(const char *what, size_t count) |
203 | { |
204 | int i; |
205 | |
206 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) { |
207 | if (!strcmp(what, cp_type[i])) |
208 | return i + 1; |
209 | } |
210 | |
211 | return CT_NONE; |
212 | } |
213 | |
214 | static const char *cp_type_to_str(enum ctype type) |
215 | { |
216 | if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type)) |
217 | return "None"; |
218 | |
219 | return cp_type[type - 1]; |
220 | } |
221 | |
222 | static const char *cp_name_to_str(enum cname name) |
223 | { |
224 | if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name)) |
225 | return "INVALID"; |
226 | |
227 | return cp_name[name - 1]; |
228 | } |
229 | |
230 | |
231 | static int lkdtm_parse_commandline(void) |
232 | { |
233 | int i; |
234 | unsigned long flags; |
235 | |
236 | if (cpoint_count < 1 || recur_count < 1) |
237 | return -EINVAL; |
238 | |
239 | spin_lock_irqsave(&count_lock, flags); |
240 | count = cpoint_count; |
241 | spin_unlock_irqrestore(&count_lock, flags); |
242 | |
243 | /* No special parameters */ |
244 | if (!cpoint_type && !cpoint_name) |
245 | return 0; |
246 | |
247 | /* Neither or both of these need to be set */ |
248 | if (!cpoint_type || !cpoint_name) |
249 | return -EINVAL; |
250 | |
251 | cptype = parse_cp_type(cpoint_type, strlen(cpoint_type)); |
252 | if (cptype == CT_NONE) |
253 | return -EINVAL; |
254 | |
255 | for (i = 0; i < ARRAY_SIZE(cp_name); i++) { |
256 | if (!strcmp(cpoint_name, cp_name[i])) { |
257 | cpoint = i + 1; |
258 | return 0; |
259 | } |
260 | } |
261 | |
262 | /* Could not find a valid crash point */ |
263 | return -EINVAL; |
264 | } |
265 | |
266 | static int recursive_loop(int a) |
267 | { |
268 | char buf[1024]; |
269 | |
270 | memset(buf,0xFF,1024); |
271 | recur_count--; |
272 | if (!recur_count) |
273 | return 0; |
274 | else |
275 | return recursive_loop(a); |
276 | } |
277 | |
278 | static void lkdtm_do_action(enum ctype which) |
279 | { |
280 | switch (which) { |
281 | case CT_PANIC: |
282 | panic("dumptest"); |
283 | break; |
284 | case CT_BUG: |
285 | BUG(); |
286 | break; |
287 | case CT_EXCEPTION: |
288 | *((int *) 0) = 0; |
289 | break; |
290 | case CT_LOOP: |
291 | for (;;) |
292 | ; |
293 | break; |
294 | case CT_OVERFLOW: |
295 | (void) recursive_loop(0); |
296 | break; |
297 | case CT_CORRUPT_STACK: { |
298 | volatile u32 data[8]; |
299 | volatile u32 *p = data; |
300 | |
301 | p[12] = 0x12345678; |
302 | break; |
303 | } |
304 | case CT_UNALIGNED_LOAD_STORE_WRITE: { |
305 | static u8 data[5] __attribute__((aligned(4))) = {1, 2, |
306 | 3, 4, 5}; |
307 | u32 *p; |
308 | u32 val = 0x12345678; |
309 | |
310 | p = (u32 *)(data + 1); |
311 | if (*p == 0) |
312 | val = 0x87654321; |
313 | *p = val; |
314 | break; |
315 | } |
316 | case CT_OVERWRITE_ALLOCATION: { |
317 | size_t len = 1020; |
318 | u32 *data = kmalloc(len, GFP_KERNEL); |
319 | |
320 | data[1024 / sizeof(u32)] = 0x12345678; |
321 | kfree(data); |
322 | break; |
323 | } |
324 | case CT_WRITE_AFTER_FREE: { |
325 | size_t len = 1024; |
326 | u32 *data = kmalloc(len, GFP_KERNEL); |
327 | |
328 | kfree(data); |
329 | schedule(); |
330 | memset(data, 0x78, len); |
331 | break; |
332 | } |
333 | case CT_SOFTLOCKUP: |
334 | preempt_disable(); |
335 | for (;;) |
336 | cpu_relax(); |
337 | break; |
338 | case CT_HARDLOCKUP: |
339 | local_irq_disable(); |
340 | for (;;) |
341 | cpu_relax(); |
342 | break; |
343 | case CT_HUNG_TASK: |
344 | set_current_state(TASK_UNINTERRUPTIBLE); |
345 | schedule(); |
346 | break; |
347 | case CT_NONE: |
348 | default: |
349 | break; |
350 | } |
351 | |
352 | } |
353 | |
354 | static void lkdtm_handler(void) |
355 | { |
356 | unsigned long flags; |
357 | bool do_it = false; |
358 | |
359 | spin_lock_irqsave(&count_lock, flags); |
360 | count--; |
361 | printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n", |
362 | cp_name_to_str(cpoint), cp_type_to_str(cptype), count); |
363 | |
364 | if (count == 0) { |
365 | do_it = true; |
366 | count = cpoint_count; |
367 | } |
368 | spin_unlock_irqrestore(&count_lock, flags); |
369 | |
370 | if (do_it) |
371 | lkdtm_do_action(cptype); |
372 | } |
373 | |
374 | static int lkdtm_register_cpoint(enum cname which) |
375 | { |
376 | int ret; |
377 | |
378 | cpoint = CN_INVALID; |
379 | if (lkdtm.entry != NULL) |
380 | unregister_jprobe(&lkdtm); |
381 | |
382 | switch (which) { |
383 | case CN_DIRECT: |
384 | lkdtm_do_action(cptype); |
385 | return 0; |
386 | case CN_INT_HARDWARE_ENTRY: |
387 | lkdtm.kp.symbol_name = "do_IRQ"; |
388 | lkdtm.entry = (kprobe_opcode_t*) jp_do_irq; |
389 | break; |
390 | case CN_INT_HW_IRQ_EN: |
391 | lkdtm.kp.symbol_name = "handle_IRQ_event"; |
392 | lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event; |
393 | break; |
394 | case CN_INT_TASKLET_ENTRY: |
395 | lkdtm.kp.symbol_name = "tasklet_action"; |
396 | lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action; |
397 | break; |
398 | case CN_FS_DEVRW: |
399 | lkdtm.kp.symbol_name = "ll_rw_block"; |
400 | lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block; |
401 | break; |
402 | case CN_MEM_SWAPOUT: |
403 | lkdtm.kp.symbol_name = "shrink_inactive_list"; |
404 | lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; |
405 | break; |
406 | case CN_TIMERADD: |
407 | lkdtm.kp.symbol_name = "hrtimer_start"; |
408 | lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start; |
409 | break; |
410 | case CN_SCSI_DISPATCH_CMD: |
411 | lkdtm.kp.symbol_name = "scsi_dispatch_cmd"; |
412 | lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd; |
413 | break; |
414 | case CN_IDE_CORE_CP: |
415 | #ifdef CONFIG_IDE |
416 | lkdtm.kp.symbol_name = "generic_ide_ioctl"; |
417 | lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl; |
418 | #else |
419 | printk(KERN_INFO "lkdtm: Crash point not available\n"); |
420 | return -EINVAL; |
421 | #endif |
422 | break; |
423 | default: |
424 | printk(KERN_INFO "lkdtm: Invalid Crash Point\n"); |
425 | return -EINVAL; |
426 | } |
427 | |
428 | cpoint = which; |
429 | if ((ret = register_jprobe(&lkdtm)) < 0) { |
430 | printk(KERN_INFO "lkdtm: Couldn't register jprobe\n"); |
431 | cpoint = CN_INVALID; |
432 | } |
433 | |
434 | return ret; |
435 | } |
436 | |
437 | static ssize_t do_register_entry(enum cname which, struct file *f, |
438 | const char __user *user_buf, size_t count, loff_t *off) |
439 | { |
440 | char *buf; |
441 | int err; |
442 | |
443 | if (count >= PAGE_SIZE) |
444 | return -EINVAL; |
445 | |
446 | buf = (char *)__get_free_page(GFP_KERNEL); |
447 | if (!buf) |
448 | return -ENOMEM; |
449 | if (copy_from_user(buf, user_buf, count)) { |
450 | free_page((unsigned long) buf); |
451 | return -EFAULT; |
452 | } |
453 | /* NULL-terminate and remove enter */ |
454 | buf[count] = '\0'; |
455 | strim(buf); |
456 | |
457 | cptype = parse_cp_type(buf, count); |
458 | free_page((unsigned long) buf); |
459 | |
460 | if (cptype == CT_NONE) |
461 | return -EINVAL; |
462 | |
463 | err = lkdtm_register_cpoint(which); |
464 | if (err < 0) |
465 | return err; |
466 | |
467 | *off += count; |
468 | |
469 | return count; |
470 | } |
471 | |
472 | /* Generic read callback that just prints out the available crash types */ |
473 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, |
474 | size_t count, loff_t *off) |
475 | { |
476 | char *buf; |
477 | int i, n, out; |
478 | |
479 | buf = (char *)__get_free_page(GFP_KERNEL); |
480 | if (buf == NULL) |
481 | return -ENOMEM; |
482 | |
483 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); |
484 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) |
485 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]); |
486 | buf[n] = '\0'; |
487 | |
488 | out = simple_read_from_buffer(user_buf, count, off, |
489 | buf, n); |
490 | free_page((unsigned long) buf); |
491 | |
492 | return out; |
493 | } |
494 | |
495 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) |
496 | { |
497 | return 0; |
498 | } |
499 | |
500 | |
501 | static ssize_t int_hardware_entry(struct file *f, const char __user *buf, |
502 | size_t count, loff_t *off) |
503 | { |
504 | return do_register_entry(CN_INT_HARDWARE_ENTRY, f, buf, count, off); |
505 | } |
506 | |
507 | static ssize_t int_hw_irq_en(struct file *f, const char __user *buf, |
508 | size_t count, loff_t *off) |
509 | { |
510 | return do_register_entry(CN_INT_HW_IRQ_EN, f, buf, count, off); |
511 | } |
512 | |
513 | static ssize_t int_tasklet_entry(struct file *f, const char __user *buf, |
514 | size_t count, loff_t *off) |
515 | { |
516 | return do_register_entry(CN_INT_TASKLET_ENTRY, f, buf, count, off); |
517 | } |
518 | |
519 | static ssize_t fs_devrw_entry(struct file *f, const char __user *buf, |
520 | size_t count, loff_t *off) |
521 | { |
522 | return do_register_entry(CN_FS_DEVRW, f, buf, count, off); |
523 | } |
524 | |
525 | static ssize_t mem_swapout_entry(struct file *f, const char __user *buf, |
526 | size_t count, loff_t *off) |
527 | { |
528 | return do_register_entry(CN_MEM_SWAPOUT, f, buf, count, off); |
529 | } |
530 | |
531 | static ssize_t timeradd_entry(struct file *f, const char __user *buf, |
532 | size_t count, loff_t *off) |
533 | { |
534 | return do_register_entry(CN_TIMERADD, f, buf, count, off); |
535 | } |
536 | |
537 | static ssize_t scsi_dispatch_cmd_entry(struct file *f, |
538 | const char __user *buf, size_t count, loff_t *off) |
539 | { |
540 | return do_register_entry(CN_SCSI_DISPATCH_CMD, f, buf, count, off); |
541 | } |
542 | |
543 | static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf, |
544 | size_t count, loff_t *off) |
545 | { |
546 | return do_register_entry(CN_IDE_CORE_CP, f, buf, count, off); |
547 | } |
548 | |
549 | /* Special entry to just crash directly. Available without KPROBEs */ |
550 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, |
551 | size_t count, loff_t *off) |
552 | { |
553 | enum ctype type; |
554 | char *buf; |
555 | |
556 | if (count >= PAGE_SIZE) |
557 | return -EINVAL; |
558 | if (count < 1) |
559 | return -EINVAL; |
560 | |
561 | buf = (char *)__get_free_page(GFP_KERNEL); |
562 | if (!buf) |
563 | return -ENOMEM; |
564 | if (copy_from_user(buf, user_buf, count)) { |
565 | free_page((unsigned long) buf); |
566 | return -EFAULT; |
567 | } |
568 | /* NULL-terminate and remove enter */ |
569 | buf[count] = '\0'; |
570 | strim(buf); |
571 | |
572 | type = parse_cp_type(buf, count); |
573 | free_page((unsigned long) buf); |
574 | if (type == CT_NONE) |
575 | return -EINVAL; |
576 | |
577 | printk(KERN_INFO "lkdtm: Performing direct entry %s\n", |
578 | cp_type_to_str(type)); |
579 | lkdtm_do_action(type); |
580 | *off += count; |
581 | |
582 | return count; |
583 | } |
584 | |
585 | struct crash_entry { |
586 | const char *name; |
587 | const struct file_operations fops; |
588 | }; |
589 | |
590 | static const struct crash_entry crash_entries[] = { |
591 | {"DIRECT", {.read = lkdtm_debugfs_read, |
592 | .llseek = generic_file_llseek, |
593 | .open = lkdtm_debugfs_open, |
594 | .write = direct_entry} }, |
595 | {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, |
596 | .llseek = generic_file_llseek, |
597 | .open = lkdtm_debugfs_open, |
598 | .write = int_hardware_entry} }, |
599 | {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, |
600 | .llseek = generic_file_llseek, |
601 | .open = lkdtm_debugfs_open, |
602 | .write = int_hw_irq_en} }, |
603 | {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, |
604 | .llseek = generic_file_llseek, |
605 | .open = lkdtm_debugfs_open, |
606 | .write = int_tasklet_entry} }, |
607 | {"FS_DEVRW", {.read = lkdtm_debugfs_read, |
608 | .llseek = generic_file_llseek, |
609 | .open = lkdtm_debugfs_open, |
610 | .write = fs_devrw_entry} }, |
611 | {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, |
612 | .llseek = generic_file_llseek, |
613 | .open = lkdtm_debugfs_open, |
614 | .write = mem_swapout_entry} }, |
615 | {"TIMERADD", {.read = lkdtm_debugfs_read, |
616 | .llseek = generic_file_llseek, |
617 | .open = lkdtm_debugfs_open, |
618 | .write = timeradd_entry} }, |
619 | {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, |
620 | .llseek = generic_file_llseek, |
621 | .open = lkdtm_debugfs_open, |
622 | .write = scsi_dispatch_cmd_entry} }, |
623 | {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, |
624 | .llseek = generic_file_llseek, |
625 | .open = lkdtm_debugfs_open, |
626 | .write = ide_core_cp_entry} }, |
627 | }; |
628 | |
629 | static struct dentry *lkdtm_debugfs_root; |
630 | |
631 | static int __init lkdtm_module_init(void) |
632 | { |
633 | int ret = -EINVAL; |
634 | int n_debugfs_entries = 1; /* Assume only the direct entry */ |
635 | int i; |
636 | |
637 | /* Register debugfs interface */ |
638 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); |
639 | if (!lkdtm_debugfs_root) { |
640 | printk(KERN_ERR "lkdtm: creating root dir failed\n"); |
641 | return -ENODEV; |
642 | } |
643 | |
644 | #ifdef CONFIG_KPROBES |
645 | n_debugfs_entries = ARRAY_SIZE(crash_entries); |
646 | #endif |
647 | |
648 | for (i = 0; i < n_debugfs_entries; i++) { |
649 | const struct crash_entry *cur = &crash_entries[i]; |
650 | struct dentry *de; |
651 | |
652 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, |
653 | NULL, &cur->fops); |
654 | if (de == NULL) { |
655 | printk(KERN_ERR "lkdtm: could not create %s\n", |
656 | cur->name); |
657 | goto out_err; |
658 | } |
659 | } |
660 | |
661 | if (lkdtm_parse_commandline() == -EINVAL) { |
662 | printk(KERN_INFO "lkdtm: Invalid command\n"); |
663 | goto out_err; |
664 | } |
665 | |
666 | if (cpoint != CN_INVALID && cptype != CT_NONE) { |
667 | ret = lkdtm_register_cpoint(cpoint); |
668 | if (ret < 0) { |
669 | printk(KERN_INFO "lkdtm: Invalid crash point %d\n", |
670 | cpoint); |
671 | goto out_err; |
672 | } |
673 | printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n", |
674 | cpoint_name, cpoint_type); |
675 | } else { |
676 | printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n"); |
677 | } |
678 | |
679 | return 0; |
680 | |
681 | out_err: |
682 | debugfs_remove_recursive(lkdtm_debugfs_root); |
683 | return ret; |
684 | } |
685 | |
686 | static void __exit lkdtm_module_exit(void) |
687 | { |
688 | debugfs_remove_recursive(lkdtm_debugfs_root); |
689 | |
690 | unregister_jprobe(&lkdtm); |
691 | printk(KERN_INFO "lkdtm: Crash point unregistered\n"); |
692 | } |
693 | |
694 | module_init(lkdtm_module_init); |
695 | module_exit(lkdtm_module_exit); |
696 | |
697 | MODULE_LICENSE("GPL"); |
698 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9