Commit | Line | Data |
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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 | 32 | */ |
feac6e21 | 33 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
8bb31b9d AG |
34 | |
35 | #include <linux/kernel.h> | |
5d861d92 | 36 | #include <linux/fs.h> |
8bb31b9d | 37 | #include <linux/module.h> |
5d861d92 | 38 | #include <linux/buffer_head.h> |
8bb31b9d | 39 | #include <linux/kprobes.h> |
5d861d92 | 40 | #include <linux/list.h> |
8bb31b9d | 41 | #include <linux/init.h> |
8bb31b9d | 42 | #include <linux/interrupt.h> |
5d861d92 | 43 | #include <linux/hrtimer.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
8bb31b9d | 45 | #include <scsi/scsi_cmnd.h> |
0347af4e | 46 | #include <linux/debugfs.h> |
cc33c537 | 47 | #include <linux/vmalloc.h> |
9ae113ce | 48 | #include <linux/mman.h> |
8bb31b9d AG |
49 | |
50 | #ifdef CONFIG_IDE | |
51 | #include <linux/ide.h> | |
52 | #endif | |
53 | ||
7d196ac3 KC |
54 | /* |
55 | * Make sure our attempts to over run the kernel stack doesn't trigger | |
56 | * a compiler warning when CONFIG_FRAME_WARN is set. Then make sure we | |
57 | * recurse past the end of THREAD_SIZE by default. | |
58 | */ | |
59 | #if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0) | |
60 | #define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2) | |
61 | #else | |
62 | #define REC_STACK_SIZE (THREAD_SIZE / 8) | |
63 | #endif | |
64 | #define REC_NUM_DEFAULT ((THREAD_SIZE / REC_STACK_SIZE) * 2) | |
65 | ||
8bb31b9d | 66 | #define DEFAULT_COUNT 10 |
cc33c537 | 67 | #define EXEC_SIZE 64 |
8bb31b9d AG |
68 | |
69 | enum cname { | |
93e2f585 NK |
70 | CN_INVALID, |
71 | CN_INT_HARDWARE_ENTRY, | |
72 | CN_INT_HW_IRQ_EN, | |
73 | CN_INT_TASKLET_ENTRY, | |
74 | CN_FS_DEVRW, | |
75 | CN_MEM_SWAPOUT, | |
76 | CN_TIMERADD, | |
77 | CN_SCSI_DISPATCH_CMD, | |
78 | CN_IDE_CORE_CP, | |
79 | CN_DIRECT, | |
8bb31b9d AG |
80 | }; |
81 | ||
82 | enum ctype { | |
93e2f585 NK |
83 | CT_NONE, |
84 | CT_PANIC, | |
85 | CT_BUG, | |
65892723 | 86 | CT_WARNING, |
93e2f585 NK |
87 | CT_EXCEPTION, |
88 | CT_LOOP, | |
89 | CT_OVERFLOW, | |
90 | CT_CORRUPT_STACK, | |
91 | CT_UNALIGNED_LOAD_STORE_WRITE, | |
92 | CT_OVERWRITE_ALLOCATION, | |
93 | CT_WRITE_AFTER_FREE, | |
94 | CT_SOFTLOCKUP, | |
95 | CT_HARDLOCKUP, | |
274a5855 | 96 | CT_SPINLOCKUP, |
93e2f585 | 97 | CT_HUNG_TASK, |
cc33c537 KC |
98 | CT_EXEC_DATA, |
99 | CT_EXEC_STACK, | |
100 | CT_EXEC_KMALLOC, | |
101 | CT_EXEC_VMALLOC, | |
9ae113ce KC |
102 | CT_EXEC_USERSPACE, |
103 | CT_ACCESS_USERSPACE, | |
104 | CT_WRITE_RO, | |
dc2b9e90 | 105 | CT_WRITE_KERN, |
8bb31b9d AG |
106 | }; |
107 | ||
108 | static char* cp_name[] = { | |
109 | "INT_HARDWARE_ENTRY", | |
110 | "INT_HW_IRQ_EN", | |
111 | "INT_TASKLET_ENTRY", | |
112 | "FS_DEVRW", | |
113 | "MEM_SWAPOUT", | |
114 | "TIMERADD", | |
115 | "SCSI_DISPATCH_CMD", | |
0347af4e SK |
116 | "IDE_CORE_CP", |
117 | "DIRECT", | |
8bb31b9d AG |
118 | }; |
119 | ||
120 | static char* cp_type[] = { | |
121 | "PANIC", | |
122 | "BUG", | |
65892723 | 123 | "WARNING", |
8bb31b9d AG |
124 | "EXCEPTION", |
125 | "LOOP", | |
0347af4e SK |
126 | "OVERFLOW", |
127 | "CORRUPT_STACK", | |
128 | "UNALIGNED_LOAD_STORE_WRITE", | |
129 | "OVERWRITE_ALLOCATION", | |
130 | "WRITE_AFTER_FREE", | |
a48223f9 FW |
131 | "SOFTLOCKUP", |
132 | "HARDLOCKUP", | |
274a5855 | 133 | "SPINLOCKUP", |
a48223f9 | 134 | "HUNG_TASK", |
cc33c537 KC |
135 | "EXEC_DATA", |
136 | "EXEC_STACK", | |
137 | "EXEC_KMALLOC", | |
138 | "EXEC_VMALLOC", | |
9ae113ce KC |
139 | "EXEC_USERSPACE", |
140 | "ACCESS_USERSPACE", | |
141 | "WRITE_RO", | |
dc2b9e90 | 142 | "WRITE_KERN", |
8bb31b9d AG |
143 | }; |
144 | ||
145 | static struct jprobe lkdtm; | |
146 | ||
147 | static int lkdtm_parse_commandline(void); | |
148 | static void lkdtm_handler(void); | |
149 | ||
ec1c620b AV |
150 | static char* cpoint_name; |
151 | static char* cpoint_type; | |
8bb31b9d AG |
152 | static int cpoint_count = DEFAULT_COUNT; |
153 | static int recur_count = REC_NUM_DEFAULT; | |
154 | ||
93e2f585 NK |
155 | static enum cname cpoint = CN_INVALID; |
156 | static enum ctype cptype = CT_NONE; | |
8bb31b9d | 157 | static int count = DEFAULT_COUNT; |
aa2c96d6 | 158 | static DEFINE_SPINLOCK(count_lock); |
274a5855 | 159 | static DEFINE_SPINLOCK(lock_me_up); |
8bb31b9d | 160 | |
cc33c537 KC |
161 | static u8 data_area[EXEC_SIZE]; |
162 | ||
9ae113ce KC |
163 | static const unsigned long rodata = 0xAA55AA55; |
164 | ||
8bb31b9d | 165 | module_param(recur_count, int, 0644); |
7d196ac3 | 166 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test"); |
dca41306 | 167 | module_param(cpoint_name, charp, 0444); |
5d861d92 | 168 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
dca41306 | 169 | module_param(cpoint_type, charp, 0444); |
5d861d92 RD |
170 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ |
171 | "hitting the crash point"); | |
172 | module_param(cpoint_count, int, 0644); | |
173 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
174 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 175 | |
2118116e | 176 | static unsigned int jp_do_irq(unsigned int irq) |
8bb31b9d AG |
177 | { |
178 | lkdtm_handler(); | |
179 | jprobe_return(); | |
180 | return 0; | |
181 | } | |
182 | ||
2118116e AB |
183 | static irqreturn_t jp_handle_irq_event(unsigned int irq, |
184 | struct irqaction *action) | |
8bb31b9d AG |
185 | { |
186 | lkdtm_handler(); | |
187 | jprobe_return(); | |
188 | return 0; | |
189 | } | |
190 | ||
2118116e | 191 | static void jp_tasklet_action(struct softirq_action *a) |
8bb31b9d AG |
192 | { |
193 | lkdtm_handler(); | |
194 | jprobe_return(); | |
195 | } | |
196 | ||
2118116e | 197 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) |
8bb31b9d AG |
198 | { |
199 | lkdtm_handler(); | |
200 | jprobe_return(); | |
201 | } | |
202 | ||
203 | struct scan_control; | |
204 | ||
2118116e AB |
205 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, |
206 | struct zone *zone, | |
207 | struct scan_control *sc) | |
8bb31b9d AG |
208 | { |
209 | lkdtm_handler(); | |
210 | jprobe_return(); | |
211 | return 0; | |
212 | } | |
213 | ||
2118116e AB |
214 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, |
215 | const enum hrtimer_mode mode) | |
8bb31b9d AG |
216 | { |
217 | lkdtm_handler(); | |
218 | jprobe_return(); | |
219 | return 0; | |
220 | } | |
221 | ||
2118116e | 222 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
8bb31b9d AG |
223 | { |
224 | lkdtm_handler(); | |
225 | jprobe_return(); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | #ifdef CONFIG_IDE | |
44629432 | 230 | static int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, |
8bb31b9d AG |
231 | struct block_device *bdev, unsigned int cmd, |
232 | unsigned long arg) | |
233 | { | |
234 | lkdtm_handler(); | |
235 | jprobe_return(); | |
236 | return 0; | |
237 | } | |
238 | #endif | |
239 | ||
0347af4e SK |
240 | /* Return the crashpoint number or NONE if the name is invalid */ |
241 | static enum ctype parse_cp_type(const char *what, size_t count) | |
242 | { | |
243 | int i; | |
244 | ||
245 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) { | |
246 | if (!strcmp(what, cp_type[i])) | |
247 | return i + 1; | |
248 | } | |
249 | ||
93e2f585 | 250 | return CT_NONE; |
0347af4e SK |
251 | } |
252 | ||
253 | static const char *cp_type_to_str(enum ctype type) | |
254 | { | |
93e2f585 | 255 | if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type)) |
0347af4e SK |
256 | return "None"; |
257 | ||
258 | return cp_type[type - 1]; | |
259 | } | |
260 | ||
261 | static const char *cp_name_to_str(enum cname name) | |
262 | { | |
93e2f585 | 263 | if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name)) |
0347af4e SK |
264 | return "INVALID"; |
265 | ||
266 | return cp_name[name - 1]; | |
267 | } | |
268 | ||
269 | ||
8bb31b9d AG |
270 | static int lkdtm_parse_commandline(void) |
271 | { | |
272 | int i; | |
aa2c96d6 | 273 | unsigned long flags; |
8bb31b9d | 274 | |
0347af4e | 275 | if (cpoint_count < 1 || recur_count < 1) |
8bb31b9d AG |
276 | return -EINVAL; |
277 | ||
aa2c96d6 | 278 | spin_lock_irqsave(&count_lock, flags); |
0347af4e | 279 | count = cpoint_count; |
aa2c96d6 | 280 | spin_unlock_irqrestore(&count_lock, flags); |
0347af4e SK |
281 | |
282 | /* No special parameters */ | |
283 | if (!cpoint_type && !cpoint_name) | |
284 | return 0; | |
285 | ||
286 | /* Neither or both of these need to be set */ | |
287 | if (!cpoint_type || !cpoint_name) | |
288 | return -EINVAL; | |
289 | ||
290 | cptype = parse_cp_type(cpoint_type, strlen(cpoint_type)); | |
93e2f585 | 291 | if (cptype == CT_NONE) |
0347af4e SK |
292 | return -EINVAL; |
293 | ||
294 | for (i = 0; i < ARRAY_SIZE(cp_name); i++) { | |
8bb31b9d AG |
295 | if (!strcmp(cpoint_name, cp_name[i])) { |
296 | cpoint = i + 1; | |
0347af4e | 297 | return 0; |
8bb31b9d AG |
298 | } |
299 | } | |
300 | ||
0347af4e SK |
301 | /* Could not find a valid crash point */ |
302 | return -EINVAL; | |
8bb31b9d AG |
303 | } |
304 | ||
7d196ac3 | 305 | static int recursive_loop(int remaining) |
8bb31b9d | 306 | { |
7d196ac3 | 307 | char buf[REC_STACK_SIZE]; |
8bb31b9d | 308 | |
7d196ac3 KC |
309 | /* Make sure compiler does not optimize this away. */ |
310 | memset(buf, (remaining & 0xff) | 0x1, REC_STACK_SIZE); | |
311 | if (!remaining) | |
8bb31b9d AG |
312 | return 0; |
313 | else | |
7d196ac3 | 314 | return recursive_loop(remaining - 1); |
8bb31b9d AG |
315 | } |
316 | ||
cc33c537 KC |
317 | static void do_nothing(void) |
318 | { | |
319 | return; | |
320 | } | |
321 | ||
dc2b9e90 KC |
322 | /* Must immediately follow do_nothing for size calculuations to work out. */ |
323 | static void do_overwritten(void) | |
324 | { | |
325 | pr_info("do_overwritten wasn't overwritten!\n"); | |
326 | return; | |
327 | } | |
328 | ||
629c66a2 KC |
329 | static noinline void corrupt_stack(void) |
330 | { | |
331 | /* Use default char array length that triggers stack protection. */ | |
332 | char data[8]; | |
333 | ||
334 | memset((void *)data, 0, 64); | |
335 | } | |
336 | ||
cc33c537 KC |
337 | static void execute_location(void *dst) |
338 | { | |
339 | void (*func)(void) = dst; | |
340 | ||
aac416fc KC |
341 | pr_info("attempting ok execution at %p\n", do_nothing); |
342 | do_nothing(); | |
343 | ||
cc33c537 | 344 | memcpy(dst, do_nothing, EXEC_SIZE); |
aac416fc KC |
345 | flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE); |
346 | pr_info("attempting bad execution at %p\n", func); | |
cc33c537 KC |
347 | func(); |
348 | } | |
349 | ||
9ae113ce KC |
350 | static void execute_user_location(void *dst) |
351 | { | |
5123662a | 352 | /* Intentionally crossing kernel/user memory boundary. */ |
9ae113ce KC |
353 | void (*func)(void) = dst; |
354 | ||
aac416fc KC |
355 | pr_info("attempting ok execution at %p\n", do_nothing); |
356 | do_nothing(); | |
357 | ||
5123662a | 358 | if (copy_to_user((void __user *)dst, do_nothing, EXEC_SIZE)) |
9ae113ce | 359 | return; |
aac416fc KC |
360 | flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE); |
361 | pr_info("attempting bad execution at %p\n", func); | |
9ae113ce KC |
362 | func(); |
363 | } | |
364 | ||
0347af4e | 365 | static void lkdtm_do_action(enum ctype which) |
8bb31b9d | 366 | { |
0347af4e | 367 | switch (which) { |
93e2f585 | 368 | case CT_PANIC: |
0347af4e SK |
369 | panic("dumptest"); |
370 | break; | |
93e2f585 | 371 | case CT_BUG: |
0347af4e SK |
372 | BUG(); |
373 | break; | |
65892723 KC |
374 | case CT_WARNING: |
375 | WARN_ON(1); | |
376 | break; | |
93e2f585 | 377 | case CT_EXCEPTION: |
0347af4e SK |
378 | *((int *) 0) = 0; |
379 | break; | |
93e2f585 | 380 | case CT_LOOP: |
0347af4e SK |
381 | for (;;) |
382 | ; | |
383 | break; | |
93e2f585 | 384 | case CT_OVERFLOW: |
7d196ac3 | 385 | (void) recursive_loop(recur_count); |
0347af4e | 386 | break; |
629c66a2 KC |
387 | case CT_CORRUPT_STACK: |
388 | corrupt_stack(); | |
0347af4e | 389 | break; |
93e2f585 | 390 | case CT_UNALIGNED_LOAD_STORE_WRITE: { |
0347af4e SK |
391 | static u8 data[5] __attribute__((aligned(4))) = {1, 2, |
392 | 3, 4, 5}; | |
393 | u32 *p; | |
394 | u32 val = 0x12345678; | |
395 | ||
396 | p = (u32 *)(data + 1); | |
397 | if (*p == 0) | |
398 | val = 0x87654321; | |
399 | *p = val; | |
400 | break; | |
401 | } | |
93e2f585 | 402 | case CT_OVERWRITE_ALLOCATION: { |
0347af4e SK |
403 | size_t len = 1020; |
404 | u32 *data = kmalloc(len, GFP_KERNEL); | |
405 | ||
406 | data[1024 / sizeof(u32)] = 0x12345678; | |
407 | kfree(data); | |
408 | break; | |
409 | } | |
93e2f585 | 410 | case CT_WRITE_AFTER_FREE: { |
0347af4e SK |
411 | size_t len = 1024; |
412 | u32 *data = kmalloc(len, GFP_KERNEL); | |
413 | ||
414 | kfree(data); | |
415 | schedule(); | |
416 | memset(data, 0x78, len); | |
417 | break; | |
418 | } | |
93e2f585 | 419 | case CT_SOFTLOCKUP: |
a48223f9 FW |
420 | preempt_disable(); |
421 | for (;;) | |
422 | cpu_relax(); | |
423 | break; | |
93e2f585 | 424 | case CT_HARDLOCKUP: |
a48223f9 FW |
425 | local_irq_disable(); |
426 | for (;;) | |
427 | cpu_relax(); | |
428 | break; | |
274a5855 KC |
429 | case CT_SPINLOCKUP: |
430 | /* Must be called twice to trigger. */ | |
431 | spin_lock(&lock_me_up); | |
5123662a KC |
432 | /* Let sparse know we intended to exit holding the lock. */ |
433 | __release(&lock_me_up); | |
274a5855 | 434 | break; |
93e2f585 | 435 | case CT_HUNG_TASK: |
a48223f9 FW |
436 | set_current_state(TASK_UNINTERRUPTIBLE); |
437 | schedule(); | |
438 | break; | |
cc33c537 KC |
439 | case CT_EXEC_DATA: |
440 | execute_location(data_area); | |
441 | break; | |
442 | case CT_EXEC_STACK: { | |
443 | u8 stack_area[EXEC_SIZE]; | |
444 | execute_location(stack_area); | |
445 | break; | |
446 | } | |
447 | case CT_EXEC_KMALLOC: { | |
448 | u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL); | |
449 | execute_location(kmalloc_area); | |
450 | kfree(kmalloc_area); | |
451 | break; | |
452 | } | |
453 | case CT_EXEC_VMALLOC: { | |
454 | u32 *vmalloc_area = vmalloc(EXEC_SIZE); | |
455 | execute_location(vmalloc_area); | |
456 | vfree(vmalloc_area); | |
457 | break; | |
458 | } | |
9ae113ce KC |
459 | case CT_EXEC_USERSPACE: { |
460 | unsigned long user_addr; | |
461 | ||
462 | user_addr = vm_mmap(NULL, 0, PAGE_SIZE, | |
463 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
464 | MAP_ANONYMOUS | MAP_PRIVATE, 0); | |
465 | if (user_addr >= TASK_SIZE) { | |
466 | pr_warn("Failed to allocate user memory\n"); | |
467 | return; | |
468 | } | |
469 | execute_user_location((void *)user_addr); | |
470 | vm_munmap(user_addr, PAGE_SIZE); | |
471 | break; | |
472 | } | |
473 | case CT_ACCESS_USERSPACE: { | |
474 | unsigned long user_addr, tmp; | |
475 | unsigned long *ptr; | |
476 | ||
477 | user_addr = vm_mmap(NULL, 0, PAGE_SIZE, | |
478 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
479 | MAP_ANONYMOUS | MAP_PRIVATE, 0); | |
480 | if (user_addr >= TASK_SIZE) { | |
481 | pr_warn("Failed to allocate user memory\n"); | |
482 | return; | |
483 | } | |
484 | ||
485 | ptr = (unsigned long *)user_addr; | |
aac416fc KC |
486 | |
487 | pr_info("attempting bad read at %p\n", ptr); | |
9ae113ce KC |
488 | tmp = *ptr; |
489 | tmp += 0xc0dec0de; | |
aac416fc KC |
490 | |
491 | pr_info("attempting bad write at %p\n", ptr); | |
9ae113ce KC |
492 | *ptr = tmp; |
493 | ||
494 | vm_munmap(user_addr, PAGE_SIZE); | |
495 | ||
496 | break; | |
497 | } | |
498 | case CT_WRITE_RO: { | |
499 | unsigned long *ptr; | |
500 | ||
501 | ptr = (unsigned long *)&rodata; | |
aac416fc KC |
502 | |
503 | pr_info("attempting bad write at %p\n", ptr); | |
9ae113ce KC |
504 | *ptr ^= 0xabcd1234; |
505 | ||
506 | break; | |
507 | } | |
dc2b9e90 KC |
508 | case CT_WRITE_KERN: { |
509 | size_t size; | |
510 | unsigned char *ptr; | |
511 | ||
512 | size = (unsigned long)do_overwritten - | |
513 | (unsigned long)do_nothing; | |
514 | ptr = (unsigned char *)do_overwritten; | |
515 | ||
516 | pr_info("attempting bad %zu byte write at %p\n", size, ptr); | |
517 | memcpy(ptr, (unsigned char *)do_nothing, size); | |
518 | flush_icache_range((unsigned long)ptr, | |
519 | (unsigned long)(ptr + size)); | |
520 | ||
521 | do_overwritten(); | |
522 | break; | |
523 | } | |
93e2f585 | 524 | case CT_NONE: |
0347af4e SK |
525 | default: |
526 | break; | |
527 | } | |
528 | ||
529 | } | |
530 | ||
531 | static void lkdtm_handler(void) | |
532 | { | |
aa2c96d6 | 533 | unsigned long flags; |
92618184 | 534 | bool do_it = false; |
aa2c96d6 JH |
535 | |
536 | spin_lock_irqsave(&count_lock, flags); | |
0347af4e | 537 | count--; |
feac6e21 KC |
538 | pr_info("Crash point %s of type %s hit, trigger in %d rounds\n", |
539 | cp_name_to_str(cpoint), cp_type_to_str(cptype), count); | |
8bb31b9d AG |
540 | |
541 | if (count == 0) { | |
92618184 | 542 | do_it = true; |
8bb31b9d AG |
543 | count = cpoint_count; |
544 | } | |
aa2c96d6 | 545 | spin_unlock_irqrestore(&count_lock, flags); |
92618184 CW |
546 | |
547 | if (do_it) | |
548 | lkdtm_do_action(cptype); | |
8bb31b9d AG |
549 | } |
550 | ||
0347af4e | 551 | static int lkdtm_register_cpoint(enum cname which) |
8bb31b9d AG |
552 | { |
553 | int ret; | |
554 | ||
93e2f585 | 555 | cpoint = CN_INVALID; |
0347af4e SK |
556 | if (lkdtm.entry != NULL) |
557 | unregister_jprobe(&lkdtm); | |
8bb31b9d | 558 | |
0347af4e | 559 | switch (which) { |
93e2f585 | 560 | case CN_DIRECT: |
0347af4e SK |
561 | lkdtm_do_action(cptype); |
562 | return 0; | |
93e2f585 | 563 | case CN_INT_HARDWARE_ENTRY: |
f58f2fa9 | 564 | lkdtm.kp.symbol_name = "do_IRQ"; |
8bb31b9d AG |
565 | lkdtm.entry = (kprobe_opcode_t*) jp_do_irq; |
566 | break; | |
93e2f585 | 567 | case CN_INT_HW_IRQ_EN: |
8bb31b9d AG |
568 | lkdtm.kp.symbol_name = "handle_IRQ_event"; |
569 | lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event; | |
570 | break; | |
93e2f585 | 571 | case CN_INT_TASKLET_ENTRY: |
8bb31b9d AG |
572 | lkdtm.kp.symbol_name = "tasklet_action"; |
573 | lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action; | |
574 | break; | |
93e2f585 | 575 | case CN_FS_DEVRW: |
8bb31b9d AG |
576 | lkdtm.kp.symbol_name = "ll_rw_block"; |
577 | lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block; | |
578 | break; | |
93e2f585 | 579 | case CN_MEM_SWAPOUT: |
18a61e4a AG |
580 | lkdtm.kp.symbol_name = "shrink_inactive_list"; |
581 | lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; | |
8bb31b9d | 582 | break; |
93e2f585 | 583 | case CN_TIMERADD: |
8bb31b9d AG |
584 | lkdtm.kp.symbol_name = "hrtimer_start"; |
585 | lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start; | |
586 | break; | |
93e2f585 | 587 | case CN_SCSI_DISPATCH_CMD: |
8bb31b9d AG |
588 | lkdtm.kp.symbol_name = "scsi_dispatch_cmd"; |
589 | lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd; | |
590 | break; | |
93e2f585 | 591 | case CN_IDE_CORE_CP: |
8bb31b9d AG |
592 | #ifdef CONFIG_IDE |
593 | lkdtm.kp.symbol_name = "generic_ide_ioctl"; | |
594 | lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl; | |
595 | #else | |
feac6e21 | 596 | pr_info("Crash point not available\n"); |
0347af4e | 597 | return -EINVAL; |
8bb31b9d AG |
598 | #endif |
599 | break; | |
600 | default: | |
feac6e21 | 601 | pr_info("Invalid Crash Point\n"); |
0347af4e | 602 | return -EINVAL; |
8bb31b9d AG |
603 | } |
604 | ||
0347af4e | 605 | cpoint = which; |
8bb31b9d | 606 | if ((ret = register_jprobe(&lkdtm)) < 0) { |
feac6e21 | 607 | pr_info("Couldn't register jprobe\n"); |
93e2f585 | 608 | cpoint = CN_INVALID; |
0347af4e SK |
609 | } |
610 | ||
611 | return ret; | |
612 | } | |
613 | ||
614 | static ssize_t do_register_entry(enum cname which, struct file *f, | |
615 | const char __user *user_buf, size_t count, loff_t *off) | |
616 | { | |
617 | char *buf; | |
618 | int err; | |
619 | ||
620 | if (count >= PAGE_SIZE) | |
621 | return -EINVAL; | |
622 | ||
623 | buf = (char *)__get_free_page(GFP_KERNEL); | |
624 | if (!buf) | |
625 | return -ENOMEM; | |
626 | if (copy_from_user(buf, user_buf, count)) { | |
627 | free_page((unsigned long) buf); | |
628 | return -EFAULT; | |
629 | } | |
630 | /* NULL-terminate and remove enter */ | |
631 | buf[count] = '\0'; | |
632 | strim(buf); | |
633 | ||
634 | cptype = parse_cp_type(buf, count); | |
635 | free_page((unsigned long) buf); | |
636 | ||
93e2f585 | 637 | if (cptype == CT_NONE) |
0347af4e SK |
638 | return -EINVAL; |
639 | ||
640 | err = lkdtm_register_cpoint(which); | |
641 | if (err < 0) | |
642 | return err; | |
643 | ||
644 | *off += count; | |
645 | ||
646 | return count; | |
647 | } | |
648 | ||
649 | /* Generic read callback that just prints out the available crash types */ | |
650 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
651 | size_t count, loff_t *off) | |
652 | { | |
653 | char *buf; | |
654 | int i, n, out; | |
655 | ||
656 | buf = (char *)__get_free_page(GFP_KERNEL); | |
086ff4b3 AC |
657 | if (buf == NULL) |
658 | return -ENOMEM; | |
0347af4e SK |
659 | |
660 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
661 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) | |
662 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]); | |
663 | buf[n] = '\0'; | |
664 | ||
665 | out = simple_read_from_buffer(user_buf, count, off, | |
666 | buf, n); | |
667 | free_page((unsigned long) buf); | |
668 | ||
669 | return out; | |
670 | } | |
671 | ||
672 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
673 | { | |
674 | return 0; | |
675 | } | |
676 | ||
677 | ||
678 | static ssize_t int_hardware_entry(struct file *f, const char __user *buf, | |
679 | size_t count, loff_t *off) | |
680 | { | |
93e2f585 | 681 | return do_register_entry(CN_INT_HARDWARE_ENTRY, f, buf, count, off); |
0347af4e SK |
682 | } |
683 | ||
684 | static ssize_t int_hw_irq_en(struct file *f, const char __user *buf, | |
685 | size_t count, loff_t *off) | |
686 | { | |
93e2f585 | 687 | return do_register_entry(CN_INT_HW_IRQ_EN, f, buf, count, off); |
0347af4e SK |
688 | } |
689 | ||
690 | static ssize_t int_tasklet_entry(struct file *f, const char __user *buf, | |
691 | size_t count, loff_t *off) | |
692 | { | |
93e2f585 | 693 | return do_register_entry(CN_INT_TASKLET_ENTRY, f, buf, count, off); |
0347af4e SK |
694 | } |
695 | ||
696 | static ssize_t fs_devrw_entry(struct file *f, const char __user *buf, | |
697 | size_t count, loff_t *off) | |
698 | { | |
93e2f585 | 699 | return do_register_entry(CN_FS_DEVRW, f, buf, count, off); |
0347af4e SK |
700 | } |
701 | ||
702 | static ssize_t mem_swapout_entry(struct file *f, const char __user *buf, | |
703 | size_t count, loff_t *off) | |
704 | { | |
93e2f585 | 705 | return do_register_entry(CN_MEM_SWAPOUT, f, buf, count, off); |
0347af4e SK |
706 | } |
707 | ||
708 | static ssize_t timeradd_entry(struct file *f, const char __user *buf, | |
709 | size_t count, loff_t *off) | |
710 | { | |
93e2f585 | 711 | return do_register_entry(CN_TIMERADD, f, buf, count, off); |
0347af4e SK |
712 | } |
713 | ||
714 | static ssize_t scsi_dispatch_cmd_entry(struct file *f, | |
715 | const char __user *buf, size_t count, loff_t *off) | |
716 | { | |
93e2f585 | 717 | return do_register_entry(CN_SCSI_DISPATCH_CMD, f, buf, count, off); |
0347af4e SK |
718 | } |
719 | ||
720 | static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf, | |
721 | size_t count, loff_t *off) | |
722 | { | |
93e2f585 | 723 | return do_register_entry(CN_IDE_CORE_CP, f, buf, count, off); |
0347af4e SK |
724 | } |
725 | ||
726 | /* Special entry to just crash directly. Available without KPROBEs */ | |
727 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
728 | size_t count, loff_t *off) | |
729 | { | |
730 | enum ctype type; | |
731 | char *buf; | |
732 | ||
733 | if (count >= PAGE_SIZE) | |
734 | return -EINVAL; | |
735 | if (count < 1) | |
736 | return -EINVAL; | |
737 | ||
738 | buf = (char *)__get_free_page(GFP_KERNEL); | |
739 | if (!buf) | |
740 | return -ENOMEM; | |
741 | if (copy_from_user(buf, user_buf, count)) { | |
742 | free_page((unsigned long) buf); | |
743 | return -EFAULT; | |
744 | } | |
745 | /* NULL-terminate and remove enter */ | |
746 | buf[count] = '\0'; | |
747 | strim(buf); | |
748 | ||
749 | type = parse_cp_type(buf, count); | |
750 | free_page((unsigned long) buf); | |
93e2f585 | 751 | if (type == CT_NONE) |
0347af4e SK |
752 | return -EINVAL; |
753 | ||
feac6e21 | 754 | pr_info("Performing direct entry %s\n", cp_type_to_str(type)); |
0347af4e SK |
755 | lkdtm_do_action(type); |
756 | *off += count; | |
757 | ||
758 | return count; | |
759 | } | |
760 | ||
761 | struct crash_entry { | |
762 | const char *name; | |
763 | const struct file_operations fops; | |
764 | }; | |
765 | ||
766 | static const struct crash_entry crash_entries[] = { | |
767 | {"DIRECT", {.read = lkdtm_debugfs_read, | |
05271ec4 | 768 | .llseek = generic_file_llseek, |
0347af4e SK |
769 | .open = lkdtm_debugfs_open, |
770 | .write = direct_entry} }, | |
771 | {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, | |
05271ec4 | 772 | .llseek = generic_file_llseek, |
0347af4e SK |
773 | .open = lkdtm_debugfs_open, |
774 | .write = int_hardware_entry} }, | |
775 | {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, | |
05271ec4 | 776 | .llseek = generic_file_llseek, |
0347af4e SK |
777 | .open = lkdtm_debugfs_open, |
778 | .write = int_hw_irq_en} }, | |
779 | {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, | |
05271ec4 | 780 | .llseek = generic_file_llseek, |
0347af4e SK |
781 | .open = lkdtm_debugfs_open, |
782 | .write = int_tasklet_entry} }, | |
783 | {"FS_DEVRW", {.read = lkdtm_debugfs_read, | |
05271ec4 | 784 | .llseek = generic_file_llseek, |
0347af4e SK |
785 | .open = lkdtm_debugfs_open, |
786 | .write = fs_devrw_entry} }, | |
787 | {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, | |
05271ec4 | 788 | .llseek = generic_file_llseek, |
0347af4e SK |
789 | .open = lkdtm_debugfs_open, |
790 | .write = mem_swapout_entry} }, | |
791 | {"TIMERADD", {.read = lkdtm_debugfs_read, | |
05271ec4 | 792 | .llseek = generic_file_llseek, |
0347af4e SK |
793 | .open = lkdtm_debugfs_open, |
794 | .write = timeradd_entry} }, | |
795 | {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, | |
05271ec4 | 796 | .llseek = generic_file_llseek, |
0347af4e SK |
797 | .open = lkdtm_debugfs_open, |
798 | .write = scsi_dispatch_cmd_entry} }, | |
799 | {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, | |
05271ec4 | 800 | .llseek = generic_file_llseek, |
0347af4e SK |
801 | .open = lkdtm_debugfs_open, |
802 | .write = ide_core_cp_entry} }, | |
803 | }; | |
804 | ||
805 | static struct dentry *lkdtm_debugfs_root; | |
806 | ||
807 | static int __init lkdtm_module_init(void) | |
808 | { | |
809 | int ret = -EINVAL; | |
810 | int n_debugfs_entries = 1; /* Assume only the direct entry */ | |
811 | int i; | |
812 | ||
813 | /* Register debugfs interface */ | |
814 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
815 | if (!lkdtm_debugfs_root) { | |
feac6e21 | 816 | pr_err("creating root dir failed\n"); |
0347af4e SK |
817 | return -ENODEV; |
818 | } | |
819 | ||
820 | #ifdef CONFIG_KPROBES | |
821 | n_debugfs_entries = ARRAY_SIZE(crash_entries); | |
822 | #endif | |
823 | ||
824 | for (i = 0; i < n_debugfs_entries; i++) { | |
825 | const struct crash_entry *cur = &crash_entries[i]; | |
826 | struct dentry *de; | |
827 | ||
828 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
829 | NULL, &cur->fops); | |
830 | if (de == NULL) { | |
feac6e21 | 831 | pr_err("could not create %s\n", cur->name); |
0347af4e SK |
832 | goto out_err; |
833 | } | |
834 | } | |
835 | ||
836 | if (lkdtm_parse_commandline() == -EINVAL) { | |
feac6e21 | 837 | pr_info("Invalid command\n"); |
0347af4e SK |
838 | goto out_err; |
839 | } | |
840 | ||
93e2f585 | 841 | if (cpoint != CN_INVALID && cptype != CT_NONE) { |
0347af4e SK |
842 | ret = lkdtm_register_cpoint(cpoint); |
843 | if (ret < 0) { | |
feac6e21 | 844 | pr_info("Invalid crash point %d\n", cpoint); |
0347af4e SK |
845 | goto out_err; |
846 | } | |
feac6e21 KC |
847 | pr_info("Crash point %s of type %s registered\n", |
848 | cpoint_name, cpoint_type); | |
0347af4e | 849 | } else { |
feac6e21 | 850 | pr_info("No crash points registered, enable through debugfs\n"); |
8bb31b9d AG |
851 | } |
852 | ||
8bb31b9d | 853 | return 0; |
0347af4e SK |
854 | |
855 | out_err: | |
856 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
857 | return ret; | |
8bb31b9d AG |
858 | } |
859 | ||
2118116e | 860 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 861 | { |
0347af4e SK |
862 | debugfs_remove_recursive(lkdtm_debugfs_root); |
863 | ||
864 | unregister_jprobe(&lkdtm); | |
feac6e21 | 865 | pr_info("Crash point unregistered\n"); |
8bb31b9d AG |
866 | } |
867 | ||
868 | module_init(lkdtm_module_init); | |
869 | module_exit(lkdtm_module_exit); | |
870 | ||
871 | MODULE_LICENSE("GPL"); |