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-rw-r--r--drivers/misc/Makefile3
-rw-r--r--drivers/misc/lkdtm.c342
-rw-r--r--lib/Kconfig.debug14
3 files changed, 358 insertions, 1 deletions
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 19c2b85249c3..c1bf1fb04c5c 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -3,5 +3,6 @@
3# 3#
4obj- := misc.o # Dummy rule to force built-in.o to be made 4obj- := misc.o # Dummy rule to force built-in.o to be made
5 5
6obj-$(CONFIG_IBM_ASM) += ibmasm/ 6obj-$(CONFIG_IBM_ASM) += ibmasm/
7obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/ 7obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/
8obj-$(CONFIG_LKDTM) += lkdtm.o
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
new file mode 100644
index 000000000000..e689ee94ac3d
--- /dev/null
+++ b/drivers/misc/lkdtm.c
@@ -0,0 +1,342 @@
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 * Usage : insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
30 * [cpoint_count={>0}]
31 *
32 * recur_count : Recursion level for the stack overflow test. Default is 10.
33 *
34 * cpoint_name : Crash point where the kernel is to be crashed. It can be
35 * one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
36 * FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
37 * IDE_CORE_CP
38 *
39 * cpoint_type : Indicates the action to be taken on hitting the crash point.
40 * It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW
41 *
42 * cpoint_count : Indicates the number of times the crash point is to be hit
43 * to trigger an action. The default is 10.
44 */
45
46#include <linux/kernel.h>
47#include <linux/module.h>
48#include <linux/kprobes.h>
49#include <linux/kallsyms.h>
50#include <linux/init.h>
51#include <linux/irq.h>
52#include <linux/interrupt.h>
53#include <scsi/scsi_cmnd.h>
54
55#ifdef CONFIG_IDE
56#include <linux/ide.h>
57#endif
58
59#define NUM_CPOINTS 8
60#define NUM_CPOINT_TYPES 5
61#define DEFAULT_COUNT 10
62#define REC_NUM_DEFAULT 10
63
64enum cname {
65 INVALID,
66 INT_HARDWARE_ENTRY,
67 INT_HW_IRQ_EN,
68 INT_TASKLET_ENTRY,
69 FS_DEVRW,
70 MEM_SWAPOUT,
71 TIMERADD,
72 SCSI_DISPATCH_CMD,
73 IDE_CORE_CP
74};
75
76enum ctype {
77 NONE,
78 PANIC,
79 BUG,
80 EXCEPTION,
81 LOOP,
82 OVERFLOW
83};
84
85static char* cp_name[] = {
86 "INT_HARDWARE_ENTRY",
87 "INT_HW_IRQ_EN",
88 "INT_TASKLET_ENTRY",
89 "FS_DEVRW",
90 "MEM_SWAPOUT",
91 "TIMERADD",
92 "SCSI_DISPATCH_CMD",
93 "IDE_CORE_CP"
94};
95
96static char* cp_type[] = {
97 "PANIC",
98 "BUG",
99 "EXCEPTION",
100 "LOOP",
101 "OVERFLOW"
102};
103
104static struct jprobe lkdtm;
105
106static int lkdtm_parse_commandline(void);
107static void lkdtm_handler(void);
108
109static char* cpoint_name = INVALID;
110static char* cpoint_type = NONE;
111static int cpoint_count = DEFAULT_COUNT;
112static int recur_count = REC_NUM_DEFAULT;
113
114static enum cname cpoint = INVALID;
115static enum ctype cptype = NONE;
116static int count = DEFAULT_COUNT;
117
118module_param(recur_count, int, 0644);
119MODULE_PARM_DESC(recur_count, "Recurcion level for the stack overflow test,\
120 default is 10");
121module_param(cpoint_name, charp, 0644);
122MODULE_PARM_DESC(cpoint_name, "Crash Point, where kernel is to be crashed");
123module_param(cpoint_type, charp, 06444);
124MODULE_PARM_DESC(cpoint_type, "Crash Point Type, action to be taken on\
125 hitting the crash point");
126module_param(cpoint_count, int, 06444);
127MODULE_PARM_DESC(cpoint_count, "Crash Point Count, number of times the \
128 crash point is to be hit to trigger action");
129
130unsigned int jp_do_irq(unsigned int irq, struct pt_regs *regs)
131{
132 lkdtm_handler();
133 jprobe_return();
134 return 0;
135}
136
137irqreturn_t jp_handle_irq_event(unsigned int irq, struct pt_regs *regs,
138 struct irqaction *action)
139{
140 lkdtm_handler();
141 jprobe_return();
142 return 0;
143}
144
145void jp_tasklet_action(struct softirq_action *a)
146{
147 lkdtm_handler();
148 jprobe_return();
149}
150
151void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
152{
153 lkdtm_handler();
154 jprobe_return();
155}
156
157struct scan_control;
158
159unsigned long jp_shrink_page_list(struct list_head *page_list,
160 struct scan_control *sc)
161{
162 lkdtm_handler();
163 jprobe_return();
164 return 0;
165}
166
167int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
168 const enum hrtimer_mode mode)
169{
170 lkdtm_handler();
171 jprobe_return();
172 return 0;
173}
174
175int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
176{
177 lkdtm_handler();
178 jprobe_return();
179 return 0;
180}
181
182#ifdef CONFIG_IDE
183int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
184 struct block_device *bdev, unsigned int cmd,
185 unsigned long arg)
186{
187 lkdtm_handler();
188 jprobe_return();
189 return 0;
190}
191#endif
192
193static int lkdtm_parse_commandline(void)
194{
195 int i;
196
197 if (cpoint_name == INVALID || cpoint_type == NONE ||
198 cpoint_count < 1 || recur_count < 1)
199 return -EINVAL;
200
201 for (i = 0; i < NUM_CPOINTS; ++i) {
202 if (!strcmp(cpoint_name, cp_name[i])) {
203 cpoint = i + 1;
204 break;
205 }
206 }
207
208 for (i = 0; i < NUM_CPOINT_TYPES; ++i) {
209 if (!strcmp(cpoint_type, cp_type[i])) {
210 cptype = i + 1;
211 break;
212 }
213 }
214
215 if (cpoint == INVALID || cptype == NONE)
216 return -EINVAL;
217
218 count = cpoint_count;
219
220 return 0;
221}
222
223static int recursive_loop(int a)
224{
225 char buf[1024];
226
227 memset(buf,0xFF,1024);
228 recur_count--;
229 if (!recur_count)
230 return 0;
231 else
232 return recursive_loop(a);
233}
234
235void lkdtm_handler(void)
236{
237 printk(KERN_INFO "lkdtm : Crash point %s of type %s hit\n",
238 cpoint_name, cpoint_type);
239 --count;
240
241 if (count == 0) {
242 switch (cptype) {
243 case NONE:
244 break;
245 case PANIC:
246 printk(KERN_INFO "lkdtm : PANIC\n");
247 panic("dumptest");
248 break;
249 case BUG:
250 printk(KERN_INFO "lkdtm : BUG\n");
251 BUG();
252 break;
253 case EXCEPTION:
254 printk(KERN_INFO "lkdtm : EXCEPTION\n");
255 *((int *) 0) = 0;
256 break;
257 case LOOP:
258 printk(KERN_INFO "lkdtm : LOOP\n");
259 for (;;);
260 break;
261 case OVERFLOW:
262 printk(KERN_INFO "lkdtm : OVERFLOW\n");
263 (void) recursive_loop(0);
264 break;
265 default:
266 break;
267 }
268 count = cpoint_count;
269 }
270}
271
272int lkdtm_module_init(void)
273{
274 int ret;
275
276 if (lkdtm_parse_commandline() == -EINVAL) {
277 printk(KERN_INFO "lkdtm : Invalid command\n");
278 return -EINVAL;
279 }
280
281 switch (cpoint) {
282 case INT_HARDWARE_ENTRY:
283 lkdtm.kp.symbol_name = "__do_IRQ";
284 lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
285 break;
286 case INT_HW_IRQ_EN:
287 lkdtm.kp.symbol_name = "handle_IRQ_event";
288 lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
289 break;
290 case INT_TASKLET_ENTRY:
291 lkdtm.kp.symbol_name = "tasklet_action";
292 lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
293 break;
294 case FS_DEVRW:
295 lkdtm.kp.symbol_name = "ll_rw_block";
296 lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
297 break;
298 case MEM_SWAPOUT:
299 lkdtm.kp.symbol_name = "shrink_page_list";
300 lkdtm.entry = (kprobe_opcode_t*) jp_shrink_page_list;
301 break;
302 case TIMERADD:
303 lkdtm.kp.symbol_name = "hrtimer_start";
304 lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
305 break;
306 case SCSI_DISPATCH_CMD:
307 lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
308 lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
309 break;
310 case IDE_CORE_CP:
311#ifdef CONFIG_IDE
312 lkdtm.kp.symbol_name = "generic_ide_ioctl";
313 lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;
314#else
315 printk(KERN_INFO "lkdtm : Crash point not available\n");
316#endif
317 break;
318 default:
319 printk(KERN_INFO "lkdtm : Invalid Crash Point\n");
320 break;
321 }
322
323 if ((ret = register_jprobe(&lkdtm)) < 0) {
324 printk(KERN_INFO "lkdtm : Couldn't register jprobe\n");
325 return ret;
326 }
327
328 printk(KERN_INFO "lkdtm : Crash point %s of type %s registered\n",
329 cpoint_name, cpoint_type);
330 return 0;
331}
332
333void lkdtm_module_exit(void)
334{
335 unregister_jprobe(&lkdtm);
336 printk(KERN_INFO "lkdtm : Crash point unregistered\n");
337}
338
339module_init(lkdtm_module_init);
340module_exit(lkdtm_module_exit);
341
342MODULE_LICENSE("GPL");
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f9ae75cc0145..756a908c441d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -384,3 +384,17 @@ config RCU_TORTURE_TEST
384 at boot time (you probably don't). 384 at boot time (you probably don't).
385 Say M if you want the RCU torture tests to build as a module. 385 Say M if you want the RCU torture tests to build as a module.
386 Say N if you are unsure. 386 Say N if you are unsure.
387
388config LKDTM
389 tristate "Linux Kernel Dump Test Tool Module"
390 depends on KPROBES
391 default n
392 help
393 This module enables testing of the different dumping mechanisms by
394 inducing system failures at predefined crash points.
395 If you don't need it: say N
396 Choose M here to compile this code as a module. The module will be
397 called lkdtm.
398
399 Documentation on how to use the module can be found in
400 drivers/misc/lkdtm.c