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![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
345 lines
7.8 KiB
C
345 lines
7.8 KiB
C
/*
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* Kprobe module for testing crash dumps
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2006
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*
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* Author: Ankita Garg <ankita@in.ibm.com>
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*
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* This module induces system failures at predefined crashpoints to
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* evaluate the reliability of crash dumps obtained using different dumping
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* solutions.
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*
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* It is adapted from the Linux Kernel Dump Test Tool by
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* Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net>
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*
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* Usage : insmod lkdtm.ko [recur_count={>0}] cpoint_name=<> cpoint_type=<>
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* [cpoint_count={>0}]
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*
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* recur_count : Recursion level for the stack overflow test. Default is 10.
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*
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* cpoint_name : Crash point where the kernel is to be crashed. It can be
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* one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
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* FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
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* IDE_CORE_CP
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*
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* cpoint_type : Indicates the action to be taken on hitting the crash point.
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* It can be one of PANIC, BUG, EXCEPTION, LOOP, OVERFLOW
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*
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* cpoint_count : Indicates the number of times the crash point is to be hit
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* to trigger an action. The default is 10.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/buffer_head.h>
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#include <linux/kprobes.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/hrtimer.h>
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#include <scsi/scsi_cmnd.h>
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#ifdef CONFIG_IDE
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#include <linux/ide.h>
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#endif
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#define NUM_CPOINTS 8
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#define NUM_CPOINT_TYPES 5
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#define DEFAULT_COUNT 10
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#define REC_NUM_DEFAULT 10
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enum cname {
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INVALID,
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INT_HARDWARE_ENTRY,
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INT_HW_IRQ_EN,
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INT_TASKLET_ENTRY,
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FS_DEVRW,
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MEM_SWAPOUT,
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TIMERADD,
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SCSI_DISPATCH_CMD,
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IDE_CORE_CP
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};
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enum ctype {
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NONE,
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PANIC,
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BUG,
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EXCEPTION,
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LOOP,
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OVERFLOW
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};
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static char* cp_name[] = {
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"INT_HARDWARE_ENTRY",
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"INT_HW_IRQ_EN",
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"INT_TASKLET_ENTRY",
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"FS_DEVRW",
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"MEM_SWAPOUT",
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"TIMERADD",
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"SCSI_DISPATCH_CMD",
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"IDE_CORE_CP"
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};
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static char* cp_type[] = {
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"PANIC",
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"BUG",
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"EXCEPTION",
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"LOOP",
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"OVERFLOW"
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};
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static struct jprobe lkdtm;
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static int lkdtm_parse_commandline(void);
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static void lkdtm_handler(void);
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static char* cpoint_name;
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static char* cpoint_type;
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static int cpoint_count = DEFAULT_COUNT;
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static int recur_count = REC_NUM_DEFAULT;
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static enum cname cpoint = INVALID;
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static enum ctype cptype = NONE;
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static int count = DEFAULT_COUNT;
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module_param(recur_count, int, 0644);
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MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\
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"default is 10");
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module_param(cpoint_name, charp, 0644);
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MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
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module_param(cpoint_type, charp, 0644);
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MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\
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"hitting the crash point");
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module_param(cpoint_count, int, 0644);
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MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\
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"crash point is to be hit to trigger action");
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static unsigned int jp_do_irq(unsigned int irq)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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static irqreturn_t jp_handle_irq_event(unsigned int irq,
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struct irqaction *action)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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static void jp_tasklet_action(struct softirq_action *a)
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{
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lkdtm_handler();
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jprobe_return();
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}
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static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
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{
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lkdtm_handler();
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jprobe_return();
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}
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struct scan_control;
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static unsigned long jp_shrink_inactive_list(unsigned long max_scan,
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struct zone *zone,
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struct scan_control *sc)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
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const enum hrtimer_mode mode)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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#ifdef CONFIG_IDE
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int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file,
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struct block_device *bdev, unsigned int cmd,
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unsigned long arg)
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{
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lkdtm_handler();
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jprobe_return();
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return 0;
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}
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#endif
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static int lkdtm_parse_commandline(void)
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{
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int i;
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if (cpoint_name == NULL || cpoint_type == NULL ||
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cpoint_count < 1 || recur_count < 1)
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return -EINVAL;
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for (i = 0; i < NUM_CPOINTS; ++i) {
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if (!strcmp(cpoint_name, cp_name[i])) {
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cpoint = i + 1;
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break;
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}
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}
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for (i = 0; i < NUM_CPOINT_TYPES; ++i) {
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if (!strcmp(cpoint_type, cp_type[i])) {
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cptype = i + 1;
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break;
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}
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}
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if (cpoint == INVALID || cptype == NONE)
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return -EINVAL;
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count = cpoint_count;
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return 0;
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}
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static int recursive_loop(int a)
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{
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char buf[1024];
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memset(buf,0xFF,1024);
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recur_count--;
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if (!recur_count)
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return 0;
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else
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return recursive_loop(a);
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}
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void lkdtm_handler(void)
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{
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printk(KERN_INFO "lkdtm : Crash point %s of type %s hit\n",
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cpoint_name, cpoint_type);
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--count;
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if (count == 0) {
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switch (cptype) {
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case NONE:
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break;
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case PANIC:
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printk(KERN_INFO "lkdtm : PANIC\n");
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panic("dumptest");
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break;
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case BUG:
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printk(KERN_INFO "lkdtm : BUG\n");
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BUG();
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break;
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case EXCEPTION:
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printk(KERN_INFO "lkdtm : EXCEPTION\n");
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*((int *) 0) = 0;
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break;
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case LOOP:
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printk(KERN_INFO "lkdtm : LOOP\n");
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for (;;);
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break;
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case OVERFLOW:
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printk(KERN_INFO "lkdtm : OVERFLOW\n");
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(void) recursive_loop(0);
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break;
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default:
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break;
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}
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count = cpoint_count;
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}
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}
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static int __init lkdtm_module_init(void)
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{
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int ret;
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if (lkdtm_parse_commandline() == -EINVAL) {
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printk(KERN_INFO "lkdtm : Invalid command\n");
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return -EINVAL;
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}
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switch (cpoint) {
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case INT_HARDWARE_ENTRY:
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lkdtm.kp.symbol_name = "__do_IRQ";
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lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
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break;
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case INT_HW_IRQ_EN:
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lkdtm.kp.symbol_name = "handle_IRQ_event";
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lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
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break;
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case INT_TASKLET_ENTRY:
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lkdtm.kp.symbol_name = "tasklet_action";
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lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
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break;
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case FS_DEVRW:
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lkdtm.kp.symbol_name = "ll_rw_block";
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lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
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break;
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case MEM_SWAPOUT:
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lkdtm.kp.symbol_name = "shrink_inactive_list";
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lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
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break;
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case TIMERADD:
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lkdtm.kp.symbol_name = "hrtimer_start";
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lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
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break;
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case SCSI_DISPATCH_CMD:
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lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
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lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
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break;
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case IDE_CORE_CP:
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#ifdef CONFIG_IDE
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lkdtm.kp.symbol_name = "generic_ide_ioctl";
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lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl;
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#else
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printk(KERN_INFO "lkdtm : Crash point not available\n");
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#endif
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break;
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default:
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printk(KERN_INFO "lkdtm : Invalid Crash Point\n");
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break;
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}
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if ((ret = register_jprobe(&lkdtm)) < 0) {
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printk(KERN_INFO "lkdtm : Couldn't register jprobe\n");
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return ret;
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}
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printk(KERN_INFO "lkdtm : Crash point %s of type %s registered\n",
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cpoint_name, cpoint_type);
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return 0;
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}
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static void __exit lkdtm_module_exit(void)
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{
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unregister_jprobe(&lkdtm);
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printk(KERN_INFO "lkdtm : Crash point unregistered\n");
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}
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module_init(lkdtm_module_init);
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module_exit(lkdtm_module_exit);
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MODULE_LICENSE("GPL");
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