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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/misc/lkdtm.c
2 * Kprobe module for testing crash dumps
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.
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.
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.
18 * Copyright (C) IBM Corporation, 2006
20 * Author: Ankita Garg <ankita@in.ibm.com>
22 * This module induces system failures at predefined crashpoints to
23 * evaluate the reliability of crash dumps obtained using different dumping
26 * It is adapted from the Linux Kernel Dump Test Tool by
27 * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
29 * Usage : insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
32 * recur_count : Recursion level for the stack overflow test. Default is 10.
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,
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
42 * cpoint_count : Indicates the number of times the crash point is to be hit
43 * to trigger an action. The default is 10.
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>
56 #include <linux/ide.h>
60 #define NUM_CPOINT_TYPES 5
61 #define DEFAULT_COUNT 10
62 #define REC_NUM_DEFAULT 10
85 static char* cp_name
[] = {
96 static char* cp_type
[] = {
104 static struct jprobe lkdtm
;
106 static int lkdtm_parse_commandline(void);
107 static void lkdtm_handler(void);
109 static char* cpoint_name
= INVALID
;
110 static char* cpoint_type
= NONE
;
111 static int cpoint_count
= DEFAULT_COUNT
;
112 static int recur_count
= REC_NUM_DEFAULT
;
114 static enum cname cpoint
= INVALID
;
115 static enum ctype cptype
= NONE
;
116 static int count
= DEFAULT_COUNT
;
118 module_param(recur_count
, int, 0644);
119 MODULE_PARM_DESC(recur_count
, "Recurcion level for the stack overflow test,\
121 module_param(cpoint_name
, charp
, 0644);
122 MODULE_PARM_DESC(cpoint_name
, "Crash Point, where kernel is to be crashed");
123 module_param(cpoint_type
, charp
, 06444);
124 MODULE_PARM_DESC(cpoint_type
, "Crash Point Type, action to be taken on\
125 hitting the crash point");
126 module_param(cpoint_count
, int, 06444);
127 MODULE_PARM_DESC(cpoint_count
, "Crash Point Count, number of times the \
128 crash point is to be hit to trigger action");
130 unsigned int jp_do_irq(unsigned int irq
, struct pt_regs
*regs
)
137 irqreturn_t
jp_handle_irq_event(unsigned int irq
, struct pt_regs
*regs
,
138 struct irqaction
*action
)
145 void jp_tasklet_action(struct softirq_action
*a
)
151 void jp_ll_rw_block(int rw
, int nr
, struct buffer_head
*bhs
[])
159 unsigned long jp_shrink_page_list(struct list_head
*page_list
,
160 struct scan_control
*sc
)
167 int jp_hrtimer_start(struct hrtimer
*timer
, ktime_t tim
,
168 const enum hrtimer_mode mode
)
175 int jp_scsi_dispatch_cmd(struct scsi_cmnd
*cmd
)
183 int jp_generic_ide_ioctl(ide_drive_t
*drive
, struct file
*file
,
184 struct block_device
*bdev
, unsigned int cmd
,
193 static int lkdtm_parse_commandline(void)
197 if (cpoint_name
== INVALID
|| cpoint_type
== NONE
||
198 cpoint_count
< 1 || recur_count
< 1)
201 for (i
= 0; i
< NUM_CPOINTS
; ++i
) {
202 if (!strcmp(cpoint_name
, cp_name
[i
])) {
208 for (i
= 0; i
< NUM_CPOINT_TYPES
; ++i
) {
209 if (!strcmp(cpoint_type
, cp_type
[i
])) {
215 if (cpoint
== INVALID
|| cptype
== NONE
)
218 count
= cpoint_count
;
223 static int recursive_loop(int a
)
227 memset(buf
,0xFF,1024);
232 return recursive_loop(a
);
235 void lkdtm_handler(void)
237 printk(KERN_INFO
"lkdtm : Crash point %s of type %s hit\n",
238 cpoint_name
, cpoint_type
);
246 printk(KERN_INFO
"lkdtm : PANIC\n");
250 printk(KERN_INFO
"lkdtm : BUG\n");
254 printk(KERN_INFO
"lkdtm : EXCEPTION\n");
258 printk(KERN_INFO
"lkdtm : LOOP\n");
262 printk(KERN_INFO
"lkdtm : OVERFLOW\n");
263 (void) recursive_loop(0);
268 count
= cpoint_count
;
272 int lkdtm_module_init(void)
276 if (lkdtm_parse_commandline() == -EINVAL
) {
277 printk(KERN_INFO
"lkdtm : Invalid command\n");
282 case INT_HARDWARE_ENTRY
:
283 lkdtm
.kp
.symbol_name
= "__do_IRQ";
284 lkdtm
.entry
= (kprobe_opcode_t
*) jp_do_irq
;
287 lkdtm
.kp
.symbol_name
= "handle_IRQ_event";
288 lkdtm
.entry
= (kprobe_opcode_t
*) jp_handle_irq_event
;
290 case INT_TASKLET_ENTRY
:
291 lkdtm
.kp
.symbol_name
= "tasklet_action";
292 lkdtm
.entry
= (kprobe_opcode_t
*) jp_tasklet_action
;
295 lkdtm
.kp
.symbol_name
= "ll_rw_block";
296 lkdtm
.entry
= (kprobe_opcode_t
*) jp_ll_rw_block
;
299 lkdtm
.kp
.symbol_name
= "shrink_page_list";
300 lkdtm
.entry
= (kprobe_opcode_t
*) jp_shrink_page_list
;
303 lkdtm
.kp
.symbol_name
= "hrtimer_start";
304 lkdtm
.entry
= (kprobe_opcode_t
*) jp_hrtimer_start
;
306 case SCSI_DISPATCH_CMD
:
307 lkdtm
.kp
.symbol_name
= "scsi_dispatch_cmd";
308 lkdtm
.entry
= (kprobe_opcode_t
*) jp_scsi_dispatch_cmd
;
312 lkdtm
.kp
.symbol_name
= "generic_ide_ioctl";
313 lkdtm
.entry
= (kprobe_opcode_t
*) jp_generic_ide_ioctl
;
315 printk(KERN_INFO
"lkdtm : Crash point not available\n");
319 printk(KERN_INFO
"lkdtm : Invalid Crash Point\n");
323 if ((ret
= register_jprobe(&lkdtm
)) < 0) {
324 printk(KERN_INFO
"lkdtm : Couldn't register jprobe\n");
328 printk(KERN_INFO
"lkdtm : Crash point %s of type %s registered\n",
329 cpoint_name
, cpoint_type
);
333 void lkdtm_module_exit(void)
335 unregister_jprobe(&lkdtm
);
336 printk(KERN_INFO
"lkdtm : Crash point unregistered\n");
339 module_init(lkdtm_module_init
);
340 module_exit(lkdtm_module_exit
);
342 MODULE_LICENSE("GPL");