759 lines
17 KiB
C
759 lines
17 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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* Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net>
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*
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* See Documentation/fault-injection/provoke-crashes.txt for instructions
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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 <linux/slab.h>
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#include <scsi/scsi_cmnd.h>
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#include <linux/debugfs.h>
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#include <linux/vmalloc.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 DEFAULT_COUNT 10
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#define REC_NUM_DEFAULT 10
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#define EXEC_SIZE 64
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enum cname {
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CN_INVALID,
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CN_INT_HARDWARE_ENTRY,
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CN_INT_HW_IRQ_EN,
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CN_INT_TASKLET_ENTRY,
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CN_FS_DEVRW,
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CN_MEM_SWAPOUT,
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CN_TIMERADD,
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CN_SCSI_DISPATCH_CMD,
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CN_IDE_CORE_CP,
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CN_DIRECT,
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};
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enum ctype {
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CT_NONE,
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CT_PANIC,
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CT_BUG,
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CT_WARNING,
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CT_EXCEPTION,
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CT_LOOP,
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CT_OVERFLOW,
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CT_CORRUPT_STACK,
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CT_UNALIGNED_LOAD_STORE_WRITE,
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CT_OVERWRITE_ALLOCATION,
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CT_WRITE_AFTER_FREE,
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CT_SOFTLOCKUP,
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CT_HARDLOCKUP,
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CT_SPINLOCKUP,
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CT_HUNG_TASK,
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CT_EXEC_DATA,
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CT_EXEC_STACK,
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CT_EXEC_KMALLOC,
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CT_EXEC_VMALLOC,
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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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"DIRECT",
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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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"WARNING",
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"EXCEPTION",
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"LOOP",
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"OVERFLOW",
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"CORRUPT_STACK",
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"UNALIGNED_LOAD_STORE_WRITE",
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"OVERWRITE_ALLOCATION",
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"WRITE_AFTER_FREE",
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"SOFTLOCKUP",
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"HARDLOCKUP",
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"SPINLOCKUP",
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"HUNG_TASK",
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"EXEC_DATA",
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"EXEC_STACK",
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"EXEC_KMALLOC",
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"EXEC_VMALLOC",
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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 = CN_INVALID;
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static enum ctype cptype = CT_NONE;
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static int count = DEFAULT_COUNT;
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static DEFINE_SPINLOCK(count_lock);
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static DEFINE_SPINLOCK(lock_me_up);
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static u8 data_area[EXEC_SIZE];
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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, 0444);
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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, 0444);
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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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/* Return the crashpoint number or NONE if the name is invalid */
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static enum ctype parse_cp_type(const char *what, size_t count)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(cp_type); i++) {
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if (!strcmp(what, cp_type[i]))
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return i + 1;
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}
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return CT_NONE;
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}
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static const char *cp_type_to_str(enum ctype type)
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{
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if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type))
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return "None";
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return cp_type[type - 1];
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}
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static const char *cp_name_to_str(enum cname name)
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{
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if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name))
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return "INVALID";
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return cp_name[name - 1];
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}
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static int lkdtm_parse_commandline(void)
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{
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int i;
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unsigned long flags;
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if (cpoint_count < 1 || recur_count < 1)
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return -EINVAL;
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spin_lock_irqsave(&count_lock, flags);
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count = cpoint_count;
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spin_unlock_irqrestore(&count_lock, flags);
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/* No special parameters */
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if (!cpoint_type && !cpoint_name)
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return 0;
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/* Neither or both of these need to be set */
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if (!cpoint_type || !cpoint_name)
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return -EINVAL;
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cptype = parse_cp_type(cpoint_type, strlen(cpoint_type));
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if (cptype == CT_NONE)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(cp_name); i++) {
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if (!strcmp(cpoint_name, cp_name[i])) {
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cpoint = i + 1;
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return 0;
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}
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}
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/* Could not find a valid crash point */
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return -EINVAL;
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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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static void do_nothing(void)
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{
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return;
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}
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static noinline void corrupt_stack(void)
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{
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/* Use default char array length that triggers stack protection. */
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char data[8];
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memset((void *)data, 0, 64);
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}
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static void execute_location(void *dst)
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{
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void (*func)(void) = dst;
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memcpy(dst, do_nothing, EXEC_SIZE);
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func();
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}
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static void lkdtm_do_action(enum ctype which)
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{
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switch (which) {
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case CT_PANIC:
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panic("dumptest");
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break;
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case CT_BUG:
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BUG();
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break;
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case CT_WARNING:
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WARN_ON(1);
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break;
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case CT_EXCEPTION:
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*((int *) 0) = 0;
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break;
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case CT_LOOP:
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for (;;)
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;
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break;
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case CT_OVERFLOW:
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(void) recursive_loop(0);
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break;
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case CT_CORRUPT_STACK:
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corrupt_stack();
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break;
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case CT_UNALIGNED_LOAD_STORE_WRITE: {
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static u8 data[5] __attribute__((aligned(4))) = {1, 2,
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3, 4, 5};
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u32 *p;
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u32 val = 0x12345678;
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p = (u32 *)(data + 1);
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if (*p == 0)
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val = 0x87654321;
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*p = val;
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break;
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}
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case CT_OVERWRITE_ALLOCATION: {
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size_t len = 1020;
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u32 *data = kmalloc(len, GFP_KERNEL);
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data[1024 / sizeof(u32)] = 0x12345678;
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kfree(data);
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break;
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}
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case CT_WRITE_AFTER_FREE: {
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size_t len = 1024;
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u32 *data = kmalloc(len, GFP_KERNEL);
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kfree(data);
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schedule();
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memset(data, 0x78, len);
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break;
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}
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case CT_SOFTLOCKUP:
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preempt_disable();
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for (;;)
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cpu_relax();
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break;
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case CT_HARDLOCKUP:
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local_irq_disable();
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for (;;)
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cpu_relax();
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break;
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case CT_SPINLOCKUP:
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/* Must be called twice to trigger. */
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spin_lock(&lock_me_up);
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break;
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case CT_HUNG_TASK:
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule();
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break;
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case CT_EXEC_DATA:
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execute_location(data_area);
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break;
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case CT_EXEC_STACK: {
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u8 stack_area[EXEC_SIZE];
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execute_location(stack_area);
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break;
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}
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case CT_EXEC_KMALLOC: {
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u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL);
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execute_location(kmalloc_area);
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kfree(kmalloc_area);
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break;
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}
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case CT_EXEC_VMALLOC: {
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u32 *vmalloc_area = vmalloc(EXEC_SIZE);
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execute_location(vmalloc_area);
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vfree(vmalloc_area);
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break;
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}
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case CT_NONE:
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default:
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break;
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}
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}
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static void lkdtm_handler(void)
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{
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unsigned long flags;
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bool do_it = false;
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spin_lock_irqsave(&count_lock, flags);
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count--;
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printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n",
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cp_name_to_str(cpoint), cp_type_to_str(cptype), count);
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if (count == 0) {
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do_it = true;
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count = cpoint_count;
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}
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spin_unlock_irqrestore(&count_lock, flags);
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if (do_it)
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lkdtm_do_action(cptype);
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}
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static int lkdtm_register_cpoint(enum cname which)
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{
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int ret;
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cpoint = CN_INVALID;
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if (lkdtm.entry != NULL)
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unregister_jprobe(&lkdtm);
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switch (which) {
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case CN_DIRECT:
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lkdtm_do_action(cptype);
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return 0;
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case CN_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 CN_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 CN_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 CN_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 CN_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 CN_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 CN_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 CN_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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return -EINVAL;
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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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return -EINVAL;
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}
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cpoint = which;
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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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cpoint = CN_INVALID;
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}
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return ret;
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}
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static ssize_t do_register_entry(enum cname which, struct file *f,
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const char __user *user_buf, size_t count, loff_t *off)
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{
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char *buf;
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int err;
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if (count >= PAGE_SIZE)
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return -EINVAL;
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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if (copy_from_user(buf, user_buf, count)) {
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free_page((unsigned long) buf);
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return -EFAULT;
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}
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/* NULL-terminate and remove enter */
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buf[count] = '\0';
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strim(buf);
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cptype = parse_cp_type(buf, count);
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free_page((unsigned long) buf);
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if (cptype == CT_NONE)
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return -EINVAL;
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err = lkdtm_register_cpoint(which);
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if (err < 0)
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return err;
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*off += count;
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return count;
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}
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/* Generic read callback that just prints out the available crash types */
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static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
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size_t count, loff_t *off)
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{
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char *buf;
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int i, n, out;
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buf = (char *)__get_free_page(GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
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for (i = 0; i < ARRAY_SIZE(cp_type); i++)
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n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]);
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buf[n] = '\0';
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out = simple_read_from_buffer(user_buf, count, off,
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buf, n);
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free_page((unsigned long) buf);
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return out;
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}
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static int lkdtm_debugfs_open(struct inode *inode, struct file *file)
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{
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|
return 0;
|
|
}
|
|
|
|
|
|
static ssize_t int_hardware_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_INT_HARDWARE_ENTRY, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t int_hw_irq_en(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_INT_HW_IRQ_EN, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t int_tasklet_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_INT_TASKLET_ENTRY, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t fs_devrw_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_FS_DEVRW, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t mem_swapout_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_MEM_SWAPOUT, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t timeradd_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_TIMERADD, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t scsi_dispatch_cmd_entry(struct file *f,
|
|
const char __user *buf, size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_SCSI_DISPATCH_CMD, f, buf, count, off);
|
|
}
|
|
|
|
static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
return do_register_entry(CN_IDE_CORE_CP, f, buf, count, off);
|
|
}
|
|
|
|
/* Special entry to just crash directly. Available without KPROBEs */
|
|
static ssize_t direct_entry(struct file *f, const char __user *user_buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
enum ctype type;
|
|
char *buf;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
return -EINVAL;
|
|
if (count < 1)
|
|
return -EINVAL;
|
|
|
|
buf = (char *)__get_free_page(GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
if (copy_from_user(buf, user_buf, count)) {
|
|
free_page((unsigned long) buf);
|
|
return -EFAULT;
|
|
}
|
|
/* NULL-terminate and remove enter */
|
|
buf[count] = '\0';
|
|
strim(buf);
|
|
|
|
type = parse_cp_type(buf, count);
|
|
free_page((unsigned long) buf);
|
|
if (type == CT_NONE)
|
|
return -EINVAL;
|
|
|
|
printk(KERN_INFO "lkdtm: Performing direct entry %s\n",
|
|
cp_type_to_str(type));
|
|
lkdtm_do_action(type);
|
|
*off += count;
|
|
|
|
return count;
|
|
}
|
|
|
|
struct crash_entry {
|
|
const char *name;
|
|
const struct file_operations fops;
|
|
};
|
|
|
|
static const struct crash_entry crash_entries[] = {
|
|
{"DIRECT", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = direct_entry} },
|
|
{"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = int_hardware_entry} },
|
|
{"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = int_hw_irq_en} },
|
|
{"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = int_tasklet_entry} },
|
|
{"FS_DEVRW", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = fs_devrw_entry} },
|
|
{"MEM_SWAPOUT", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = mem_swapout_entry} },
|
|
{"TIMERADD", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = timeradd_entry} },
|
|
{"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = scsi_dispatch_cmd_entry} },
|
|
{"IDE_CORE_CP", {.read = lkdtm_debugfs_read,
|
|
.llseek = generic_file_llseek,
|
|
.open = lkdtm_debugfs_open,
|
|
.write = ide_core_cp_entry} },
|
|
};
|
|
|
|
static struct dentry *lkdtm_debugfs_root;
|
|
|
|
static int __init lkdtm_module_init(void)
|
|
{
|
|
int ret = -EINVAL;
|
|
int n_debugfs_entries = 1; /* Assume only the direct entry */
|
|
int i;
|
|
|
|
/* Register debugfs interface */
|
|
lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
|
|
if (!lkdtm_debugfs_root) {
|
|
printk(KERN_ERR "lkdtm: creating root dir failed\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
#ifdef CONFIG_KPROBES
|
|
n_debugfs_entries = ARRAY_SIZE(crash_entries);
|
|
#endif
|
|
|
|
for (i = 0; i < n_debugfs_entries; i++) {
|
|
const struct crash_entry *cur = &crash_entries[i];
|
|
struct dentry *de;
|
|
|
|
de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
|
|
NULL, &cur->fops);
|
|
if (de == NULL) {
|
|
printk(KERN_ERR "lkdtm: could not create %s\n",
|
|
cur->name);
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (lkdtm_parse_commandline() == -EINVAL) {
|
|
printk(KERN_INFO "lkdtm: Invalid command\n");
|
|
goto out_err;
|
|
}
|
|
|
|
if (cpoint != CN_INVALID && cptype != CT_NONE) {
|
|
ret = lkdtm_register_cpoint(cpoint);
|
|
if (ret < 0) {
|
|
printk(KERN_INFO "lkdtm: Invalid crash point %d\n",
|
|
cpoint);
|
|
goto out_err;
|
|
}
|
|
printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n",
|
|
cpoint_name, cpoint_type);
|
|
} else {
|
|
printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n");
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err:
|
|
debugfs_remove_recursive(lkdtm_debugfs_root);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit lkdtm_module_exit(void)
|
|
{
|
|
debugfs_remove_recursive(lkdtm_debugfs_root);
|
|
|
|
unregister_jprobe(&lkdtm);
|
|
printk(KERN_INFO "lkdtm: Crash point unregistered\n");
|
|
}
|
|
|
|
module_init(lkdtm_module_init);
|
|
module_exit(lkdtm_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|