mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Alan Cox](/assets/img/avatar_default.png)
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=44691 Reported-by: <rucsoftsec@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
697 lines
16 KiB
C
697 lines
16 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net>
|
|
*
|
|
* See Documentation/fault-injection/provoke-crashes.txt for instructions
|
|
*/
|
|
|
|
#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 <linux/slab.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <linux/debugfs.h>
|
|
|
|
#ifdef CONFIG_IDE
|
|
#include <linux/ide.h>
|
|
#endif
|
|
|
|
#define DEFAULT_COUNT 10
|
|
#define REC_NUM_DEFAULT 10
|
|
|
|
enum cname {
|
|
CN_INVALID,
|
|
CN_INT_HARDWARE_ENTRY,
|
|
CN_INT_HW_IRQ_EN,
|
|
CN_INT_TASKLET_ENTRY,
|
|
CN_FS_DEVRW,
|
|
CN_MEM_SWAPOUT,
|
|
CN_TIMERADD,
|
|
CN_SCSI_DISPATCH_CMD,
|
|
CN_IDE_CORE_CP,
|
|
CN_DIRECT,
|
|
};
|
|
|
|
enum ctype {
|
|
CT_NONE,
|
|
CT_PANIC,
|
|
CT_BUG,
|
|
CT_EXCEPTION,
|
|
CT_LOOP,
|
|
CT_OVERFLOW,
|
|
CT_CORRUPT_STACK,
|
|
CT_UNALIGNED_LOAD_STORE_WRITE,
|
|
CT_OVERWRITE_ALLOCATION,
|
|
CT_WRITE_AFTER_FREE,
|
|
CT_SOFTLOCKUP,
|
|
CT_HARDLOCKUP,
|
|
CT_HUNG_TASK,
|
|
};
|
|
|
|
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",
|
|
"DIRECT",
|
|
};
|
|
|
|
static char* cp_type[] = {
|
|
"PANIC",
|
|
"BUG",
|
|
"EXCEPTION",
|
|
"LOOP",
|
|
"OVERFLOW",
|
|
"CORRUPT_STACK",
|
|
"UNALIGNED_LOAD_STORE_WRITE",
|
|
"OVERWRITE_ALLOCATION",
|
|
"WRITE_AFTER_FREE",
|
|
"SOFTLOCKUP",
|
|
"HARDLOCKUP",
|
|
"HUNG_TASK",
|
|
};
|
|
|
|
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 = CN_INVALID;
|
|
static enum ctype cptype = CT_NONE;
|
|
static int count = DEFAULT_COUNT;
|
|
static DEFINE_SPINLOCK(count_lock);
|
|
|
|
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, 0444);
|
|
MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed");
|
|
module_param(cpoint_type, charp, 0444);
|
|
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");
|
|
|
|
static unsigned int jp_do_irq(unsigned int irq)
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t jp_handle_irq_event(unsigned int irq,
|
|
struct irqaction *action)
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
return 0;
|
|
}
|
|
|
|
static void jp_tasklet_action(struct softirq_action *a)
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
}
|
|
|
|
static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
}
|
|
|
|
struct scan_control;
|
|
|
|
static unsigned long jp_shrink_inactive_list(unsigned long max_scan,
|
|
struct zone *zone,
|
|
struct scan_control *sc)
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
return 0;
|
|
}
|
|
|
|
static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim,
|
|
const enum hrtimer_mode mode)
|
|
{
|
|
lkdtm_handler();
|
|
jprobe_return();
|
|
return 0;
|
|
}
|
|
|
|
static 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
|
|
|
|
/* Return the crashpoint number or NONE if the name is invalid */
|
|
static enum ctype parse_cp_type(const char *what, size_t count)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cp_type); i++) {
|
|
if (!strcmp(what, cp_type[i]))
|
|
return i + 1;
|
|
}
|
|
|
|
return CT_NONE;
|
|
}
|
|
|
|
static const char *cp_type_to_str(enum ctype type)
|
|
{
|
|
if (type == CT_NONE || type < 0 || type > ARRAY_SIZE(cp_type))
|
|
return "None";
|
|
|
|
return cp_type[type - 1];
|
|
}
|
|
|
|
static const char *cp_name_to_str(enum cname name)
|
|
{
|
|
if (name == CN_INVALID || name < 0 || name > ARRAY_SIZE(cp_name))
|
|
return "INVALID";
|
|
|
|
return cp_name[name - 1];
|
|
}
|
|
|
|
|
|
static int lkdtm_parse_commandline(void)
|
|
{
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
if (cpoint_count < 1 || recur_count < 1)
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(&count_lock, flags);
|
|
count = cpoint_count;
|
|
spin_unlock_irqrestore(&count_lock, flags);
|
|
|
|
/* No special parameters */
|
|
if (!cpoint_type && !cpoint_name)
|
|
return 0;
|
|
|
|
/* Neither or both of these need to be set */
|
|
if (!cpoint_type || !cpoint_name)
|
|
return -EINVAL;
|
|
|
|
cptype = parse_cp_type(cpoint_type, strlen(cpoint_type));
|
|
if (cptype == CT_NONE)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(cp_name); i++) {
|
|
if (!strcmp(cpoint_name, cp_name[i])) {
|
|
cpoint = i + 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Could not find a valid crash point */
|
|
return -EINVAL;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static void lkdtm_do_action(enum ctype which)
|
|
{
|
|
switch (which) {
|
|
case CT_PANIC:
|
|
panic("dumptest");
|
|
break;
|
|
case CT_BUG:
|
|
BUG();
|
|
break;
|
|
case CT_EXCEPTION:
|
|
*((int *) 0) = 0;
|
|
break;
|
|
case CT_LOOP:
|
|
for (;;)
|
|
;
|
|
break;
|
|
case CT_OVERFLOW:
|
|
(void) recursive_loop(0);
|
|
break;
|
|
case CT_CORRUPT_STACK: {
|
|
volatile u32 data[8];
|
|
volatile u32 *p = data;
|
|
|
|
p[12] = 0x12345678;
|
|
break;
|
|
}
|
|
case CT_UNALIGNED_LOAD_STORE_WRITE: {
|
|
static u8 data[5] __attribute__((aligned(4))) = {1, 2,
|
|
3, 4, 5};
|
|
u32 *p;
|
|
u32 val = 0x12345678;
|
|
|
|
p = (u32 *)(data + 1);
|
|
if (*p == 0)
|
|
val = 0x87654321;
|
|
*p = val;
|
|
break;
|
|
}
|
|
case CT_OVERWRITE_ALLOCATION: {
|
|
size_t len = 1020;
|
|
u32 *data = kmalloc(len, GFP_KERNEL);
|
|
|
|
data[1024 / sizeof(u32)] = 0x12345678;
|
|
kfree(data);
|
|
break;
|
|
}
|
|
case CT_WRITE_AFTER_FREE: {
|
|
size_t len = 1024;
|
|
u32 *data = kmalloc(len, GFP_KERNEL);
|
|
|
|
kfree(data);
|
|
schedule();
|
|
memset(data, 0x78, len);
|
|
break;
|
|
}
|
|
case CT_SOFTLOCKUP:
|
|
preempt_disable();
|
|
for (;;)
|
|
cpu_relax();
|
|
break;
|
|
case CT_HARDLOCKUP:
|
|
local_irq_disable();
|
|
for (;;)
|
|
cpu_relax();
|
|
break;
|
|
case CT_HUNG_TASK:
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule();
|
|
break;
|
|
case CT_NONE:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
static void lkdtm_handler(void)
|
|
{
|
|
unsigned long flags;
|
|
bool do_it = false;
|
|
|
|
spin_lock_irqsave(&count_lock, flags);
|
|
count--;
|
|
printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n",
|
|
cp_name_to_str(cpoint), cp_type_to_str(cptype), count);
|
|
|
|
if (count == 0) {
|
|
do_it = true;
|
|
count = cpoint_count;
|
|
}
|
|
spin_unlock_irqrestore(&count_lock, flags);
|
|
|
|
if (do_it)
|
|
lkdtm_do_action(cptype);
|
|
}
|
|
|
|
static int lkdtm_register_cpoint(enum cname which)
|
|
{
|
|
int ret;
|
|
|
|
cpoint = CN_INVALID;
|
|
if (lkdtm.entry != NULL)
|
|
unregister_jprobe(&lkdtm);
|
|
|
|
switch (which) {
|
|
case CN_DIRECT:
|
|
lkdtm_do_action(cptype);
|
|
return 0;
|
|
case CN_INT_HARDWARE_ENTRY:
|
|
lkdtm.kp.symbol_name = "do_IRQ";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_do_irq;
|
|
break;
|
|
case CN_INT_HW_IRQ_EN:
|
|
lkdtm.kp.symbol_name = "handle_IRQ_event";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event;
|
|
break;
|
|
case CN_INT_TASKLET_ENTRY:
|
|
lkdtm.kp.symbol_name = "tasklet_action";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action;
|
|
break;
|
|
case CN_FS_DEVRW:
|
|
lkdtm.kp.symbol_name = "ll_rw_block";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block;
|
|
break;
|
|
case CN_MEM_SWAPOUT:
|
|
lkdtm.kp.symbol_name = "shrink_inactive_list";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list;
|
|
break;
|
|
case CN_TIMERADD:
|
|
lkdtm.kp.symbol_name = "hrtimer_start";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start;
|
|
break;
|
|
case CN_SCSI_DISPATCH_CMD:
|
|
lkdtm.kp.symbol_name = "scsi_dispatch_cmd";
|
|
lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd;
|
|
break;
|
|
case CN_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");
|
|
return -EINVAL;
|
|
#endif
|
|
break;
|
|
default:
|
|
printk(KERN_INFO "lkdtm: Invalid Crash Point\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
cpoint = which;
|
|
if ((ret = register_jprobe(&lkdtm)) < 0) {
|
|
printk(KERN_INFO "lkdtm: Couldn't register jprobe\n");
|
|
cpoint = CN_INVALID;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t do_register_entry(enum cname which, struct file *f,
|
|
const char __user *user_buf, size_t count, loff_t *off)
|
|
{
|
|
char *buf;
|
|
int err;
|
|
|
|
if (count >= PAGE_SIZE)
|
|
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);
|
|
|
|
cptype = parse_cp_type(buf, count);
|
|
free_page((unsigned long) buf);
|
|
|
|
if (cptype == CT_NONE)
|
|
return -EINVAL;
|
|
|
|
err = lkdtm_register_cpoint(which);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
*off += count;
|
|
|
|
return count;
|
|
}
|
|
|
|
/* Generic read callback that just prints out the available crash types */
|
|
static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
char *buf;
|
|
int i, n, out;
|
|
|
|
buf = (char *)__get_free_page(GFP_KERNEL);
|
|
if (buf == NULL)
|
|
return -ENOMEM;
|
|
|
|
n = snprintf(buf, PAGE_SIZE, "Available crash types:\n");
|
|
for (i = 0; i < ARRAY_SIZE(cp_type); i++)
|
|
n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]);
|
|
buf[n] = '\0';
|
|
|
|
out = simple_read_from_buffer(user_buf, count, off,
|
|
buf, n);
|
|
free_page((unsigned long) buf);
|
|
|
|
return out;
|
|
}
|
|
|
|
static int lkdtm_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
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");
|