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/*

 * Kprobe module for testing crash dumps

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 *

 * Copyright (C) IBM Corporation, 2006

 *

 * Author: Ankita Garg <ankita@in.ibm.com>

 *

 * This module induces system failures at predefined crashpoints to

 * evaluate the reliability of crash dumps obtained using different dumping

 * solutions.

 *

 * It is adapted from the Linux Kernel Dump Test Tool by

 * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>

 *

 * Usage :  insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>

 *                                                      [cpoint_count={>0}]

 *

 * recur_count : Recursion level for the stack overflow test. Default is 10.

 *

 * cpoint_name : Crash point where the kernel is to be crashed. It can be

 *               one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,

 *               FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,

 *               IDE_CORE_CP

 *

 * cpoint_type : Indicates the action to be taken on hitting the crash point.

 *               It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW

 *

 * cpoint_count : Indicates the number of times the crash point is to be hit

 *                to trigger an action. The default is 10.

 */

#include <linux/kernel.h>

#include <linux/fs.h>

#include <linux/module.h>

#include <linux/buffer_head.h>

#include <linux/kprobes.h>

#include <linux/list.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/hrtimer.h>

#include <scsi/scsi_cmnd.h>

#ifdef CONFIG_IDE

#include <linux/ide.h>

#endif

#define NUM_CPOINTS 8

#define NUM_CPOINT_TYPES 5

#define DEFAULT_COUNT 10

#define REC_NUM_DEFAULT 10

enum cname {

        INVALID,

        INT_HARDWARE_ENTRY,

        INT_HW_IRQ_EN,

        INT_TASKLET_ENTRY,

        FS_DEVRW,

        MEM_SWAPOUT,

        TIMERADD,

        SCSI_DISPATCH_CMD,

        IDE_CORE_CP

};

enum ctype {

        NONE,

        PANIC,

        BUG,

        EXCEPTION,

        LOOP,

        OVERFLOW

};

static char* cp_name[] = {

        "INT_HARDWARE_ENTRY",

        "INT_HW_IRQ_EN",

        "INT_TASKLET_ENTRY",

        "FS_DEVRW",

        "MEM_SWAPOUT",

        "TIMERADD",

        "SCSI_DISPATCH_CMD",

        "IDE_CORE_CP"

};

static char* cp_type[] = {

        "PANIC",

        "BUG",

        "EXCEPTION",

        "LOOP",

        "OVERFLOW"

};

static struct jprobe lkdtm;

static int lkdtm_parse_commandline(void);

static void lkdtm_handler(void);

static char* cpoint_name;

static char* cpoint_type;

static int cpoint_count = DEFAULT_COUNT;

static int recur_count = REC_NUM_DEFAULT;

static enum cname cpoint = INVALID;

static enum ctype cptype = NONE;

static int count = DEFAULT_COUNT;

module_param(recur_count, int, 0644);

MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\

                                 "default is 10");

module_param(cpoint_name, charp, 0644);

MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");

module_param(cpoint_type, charp, 0644);

MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\

                                "hitting the crash point");

module_param(cpoint_count, int, 0644);

MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\

                                "crash point is to be hit to trigger action");

unsigned int jp_do_irq(unsigned int irq)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

irqreturn_t jp_handle_irq_event(unsigned int irq, struct irqaction *action)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

void jp_tasklet_action(struct softirq_action *a)

{

        lkdtm_handler();

        jprobe_return();

}

void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])

{

        lkdtm_handler();

        jprobe_return();

}

struct scan_control;

unsigned long jp_shrink_inactive_list(unsigned long max_scan,

                                struct zone *zone, struct scan_control *sc)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,

                                const enum hrtimer_mode mode)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

#ifdef CONFIG_IDE

int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,

                        struct block_device *bdev, unsigned int cmd,

                        unsigned long arg)

{

        lkdtm_handler();

        jprobe_return();

        return 0;

}

#endif

static int lkdtm_parse_commandline(void)

{

        int i;

        if (cpoint_name == INVALID || cpoint_type == NONE ||

                                        cpoint_count < 1 || recur_count < 1)

                return -EINVAL;

        for (i = 0; i < NUM_CPOINTS; ++i) {

                if (!strcmp(cpoint_name, cp_name[i])) {

                        cpoint = i + 1;

                        break;

                }

        }

        for (i = 0; i < NUM_CPOINT_TYPES; ++i) {

                if (!strcmp(cpoint_type, cp_type[i])) {

                        cptype = i + 1;

                        break;

                }

        }

        if (cpoint == INVALID || cptype == NONE)

                return -EINVAL;

        count = cpoint_count;

        return 0;

}

static int recursive_loop(int a)

{

        char buf[1024];

        memset(buf,0xFF,1024);

        recur_count--;

        if (!recur_count)

                return 0;

        else

                return recursive_loop(a);

}

void lkdtm_handler(void)

{

        printk(KERN_INFO "lkdtm : Crash point %s of type %s hit\n",

                                         cpoint_name, cpoint_type);

        --count;

        if (count == 0) {

                switch (cptype) {

                case NONE:

                        break;

                case PANIC:

                        printk(KERN_INFO "lkdtm : PANIC\n");

                        panic("dumptest");

                        break;

                case BUG:

                        printk(KERN_INFO "lkdtm : BUG\n");

                        BUG();

                        break;

                case EXCEPTION:

                        printk(KERN_INFO "lkdtm : EXCEPTION\n");

                        *((int *) 0) = 0;

                        break;

                case LOOP:

                        printk(KERN_INFO "lkdtm : LOOP\n");

                        for (;;);

                        break;

                case OVERFLOW:

                        printk(KERN_INFO "lkdtm : OVERFLOW\n");

                        (void) recursive_loop(0);

                        break;

                default:

                        break;

                }

                count = cpoint_count;

        }

}

int lkdtm_module_init(void)

{

        int ret;

        if (lkdtm_parse_commandline() == -EINVAL) {

                printk(KERN_INFO "lkdtm : Invalid command\n");

                return -EINVAL;

        }

        switch (cpoint) {

        case INT_HARDWARE_ENTRY:

                lkdtm.kp.symbol_name = "__do_IRQ";

                lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;

                break;

        case INT_HW_IRQ_EN:

                lkdtm.kp.symbol_name = "handle_IRQ_event";

                lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;

                break;

        case INT_TASKLET_ENTRY:

                lkdtm.kp.symbol_name = "tasklet_action";

                lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;

                break;

        case FS_DEVRW:

                lkdtm.kp.symbol_name = "ll_rw_block";

                lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;

                break;

        case MEM_SWAPOUT:

                lkdtm.kp.symbol_name = "shrink_inactive_list";

                lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;

                break;

        case TIMERADD:

                lkdtm.kp.symbol_name = "hrtimer_start";

                lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;

                break;

        case SCSI_DISPATCH_CMD:

                lkdtm.kp.symbol_name = "scsi_dispatch_cmd";

                lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;

                break;

        case IDE_CORE_CP:

#ifdef CONFIG_IDE

                lkdtm.kp.symbol_name = "generic_ide_ioctl";

                lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;

#else

                printk(KERN_INFO "lkdtm : Crash point not available\n");

#endif

                break;

        default:

                printk(KERN_INFO "lkdtm : Invalid Crash Point\n");

                break;

        }

        if ((ret = register_jprobe(&lkdtm)) < 0) {

                printk(KERN_INFO "lkdtm : Couldn't register jprobe\n");

                return ret;

        }

        printk(KERN_INFO "lkdtm : Crash point %s of type %s registered\n",

                                                cpoint_name, cpoint_type);

        return 0;

}

void lkdtm_module_exit(void)

{

        unregister_jprobe(&lkdtm);

        printk(KERN_INFO "lkdtm : Crash point unregistered\n");

}

module_init(lkdtm_module_init);

module_exit(lkdtm_module_exit);

MODULE_LICENSE("GPL");